CN110187181B - Resistance detection method and device - Google Patents

Resistance detection method and device Download PDF

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Publication number
CN110187181B
CN110187181B CN201910581846.1A CN201910581846A CN110187181B CN 110187181 B CN110187181 B CN 110187181B CN 201910581846 A CN201910581846 A CN 201910581846A CN 110187181 B CN110187181 B CN 110187181B
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relay
resistor
electric heating
pump
resistance
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CN110187181A (en
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仝玉华
闫立冰
杨永明
王毓源
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Weichai Power Co Ltd
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Weichai Power Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
    • G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

The invention provides a resistance detection method and a resistance detection device, wherein after an engine is monitored to be started, a first closing instruction is sent to a pressure pipe electric heating relay, a post-processing heating main relay and the pressure pipe electric heating relay are both in an opening state when the engine is started, then first information is returned after the pressure pipe electric heating relay responds to the first closing instruction to execute closing operation, the first information represents that the pressure pipe electric heating relay is in a closing state, first voltage at a sixth pin is collected, and a resistance value of heating from a pump to a nozzle is calculated based on the first voltage. According to the technical scheme provided by the invention, the heating power P of the pump-to-mouth heating wire can be accurately calculated by calculating the actual resistance of the pump-to-mouth heating wire, namely the heating power of the pipeline heating resistance wire can be accurately calculated by pre-calculating the actual resistance of the pipeline heating resistance wire, so that the SCR pipeline is completely unfrozen.

Description

Resistance detection method and device
Technical Field
The invention relates to the technical field of mechanical industry, in particular to a resistance detection method and device.
Background
The urea solution freezes when being less than-11 degrees, in order to guarantee to normally spray urea to SCR aftertreatment system to make emission up to standard, usually need to carry out the defrosting to the SCR pipe-line system that adopts the electrical heating. The method comprises the steps of obtaining energy W0 required by thawing completion by using an electrically heated SCR pipeline system according to an environmental temperature table, integrating the heating power P of a pipeline heating resistance wire in a pipeline, and considering thawing completion when the integral reaches energy W0.
When the heating power P of the pipeline heating resistance wire is calculated, the resistance value R of the pipeline heating resistance wire is needed. The resistance value R of the pipeline heating resistance wire in the prior art is a standard quantity, and if the pipeline is replaced in the operation process, the real resistance value of the pipeline heating resistance wire is changed, so that the standard quantity cannot be automatically updated; and the real resistance value of the pipeline heating resistance wire can also be changed along with the aging of the pipeline heating resistance wire and other factors, and the standard quantity cannot be automatically updated at the moment.
Because the standard quantity can not be automatically updated, the difference between the standard quantity and the real resistance value is often large, for example, the standard quantity is large, the integral time of the resistance wire is short, and theoretically, when the energy is integrated to the energy W0, the actual situation is likely to be unfrozen and not completed, so that the normal work of the SCR post-treatment system is influenced, the pressure building failure is seriously caused, and the SCR post-treatment system is in failure.
Disclosure of Invention
In view of this, embodiments of the present invention provide a resistance detection method and device, which achieve the purpose of completely defrosting an SCR pipeline by calculating an actual resistance value of a pipeline heating resistance wire.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
the invention discloses a resistance detection method in a first aspect, which is applied to a controller, wherein the controller is connected with a circuit of an SCR pipeline system; the circuit comprises a post-treatment heating main relay, a first resistor, a pressure pipe electric heating relay, a pump-to-nozzle heating wire and a second resistor; a first pin and a second pin of the controller are respectively connected with two ends of a coil in the post-treatment heating main relay, one end of a switch in the post-treatment heating main relay is connected with a first power supply through the first resistor, and the other end of the switch in the post-treatment heating main relay is connected with a sixth pin of the controller; a first pin and a third pin of the controller are respectively connected with two ends of a coil in the pressure pipe electric heating relay; one end of a switch in the pressure pipe electric heating relay is connected with the sixth pin through the pump-to-mouth heating wire, and the other end of the switch in the pressure pipe electric heating relay is grounded through the second resistor, and the method comprises the following steps:
after the engine is monitored to be started, sending a first closing instruction to the pressure pipe electric heating relay; when the engine is not started, the post-treatment heating main relay and the pressure pipe electric heating relay are both in an opening state;
receiving first information returned by the pressure pipe electric heating relay after the pressure pipe electric heating relay responds to the first closing instruction to execute closing operation, wherein the first information represents that the pressure pipe electric heating relay is in a closed state;
collecting a first voltage at the sixth pin;
calculating the resistance of the pump-to-mouth heating wire based on the first voltage.
Optionally, the circuit further comprises a return pipe electric heating relay and a pump-to-tank heating wire; the first pin and the fourth pin of the controller are respectively connected with two ends of a coil in the return pipe electric heating relay, one end of a switch in the return pipe electric heating relay is connected with the sixth pin through the pump-to-box heating wire, and the other end of the switch in the return pipe electric heating relay is grounded through the second resistor, and the method further comprises the following steps:
controlling the pressure pipe electric heating relay to be opened;
sending a second closing instruction to the return pipe electric heating relay, wherein the return pipe electric heating relay is in an opening state when the engine is not started;
receiving second information returned by the return pipe electric heating relay after responding to the second closing instruction to execute closing operation, wherein the second information represents that the return pipe electric heating relay is in a closed state;
collecting a second voltage at the sixth pin;
calculating the resistance of the pump-to-tank heating wire based on the second voltage.
Optionally, the circuit further comprises a pipette electrical heating relay and a tank-to-pump heating wire; the first pin and the fifth pin of the controller are respectively connected with two ends of a coil in the pipette electric heating relay, one end of a switch in the pipette electric heating relay is connected with the sixth pin through the tank-to-pump heating wire, and the other end of the switch in the pipette electric heating relay is grounded through the second resistor, and the method further comprises the following steps:
controlling the opening of the electric heating relay of the return pipe;
sending a third closing instruction to the pipette electrical heating relay, wherein the pipette electrical heating relay is in an open state when the engine is not started;
receiving third information returned by the pipette electric heating relay after responding to the third closing instruction to execute the closing operation, wherein the third information represents that the pipette electric heating relay is in a closed state;
collecting a third voltage at the sixth pin;
calculating the resistance of the tank to the pump heating wire based on the third voltage.
Optionally, a second power supply and a pull-up resistor are arranged in the sixth pin, and the pump-to-mouth heating wire, the pump-to-tank heating wire and the tank-to-pump heating wire are all connected with the second power supply through the pull-up resistor;
the calculating the resistance of the pump-to-mouth heating wire based on the first voltage includes:
acquiring a voltage value of the second power supply, a resistance value of the pull-up resistor and a resistance value of the second resistor;
taking the first voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a first preset resistance value calculation formula to obtain the resistor of the pump-to-mouth heating wire; wherein the first preset resistance value calculation formula is generated based on ohm's law.
Optionally, the calculating the resistance of the pump-to-tank heating wire based on the second voltage includes:
acquiring a voltage value of the second power supply, a resistance value of the pull-up resistor and a resistance value of the second resistor;
taking the second voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a second preset resistance value calculation formula to obtain the resistor of the pump-to-tank heating wire; wherein the second preset resistance value calculation formula is generated based on ohm's law.
Optionally, the calculating the resistance from the tank to the pump heating wire based on the third voltage includes:
acquiring a voltage value of the second power supply, a resistance value of the pull-up resistor and a resistance value of the second resistor;
taking the third voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a third preset resistance value calculation formula to obtain the resistor from the tank to the pump heating wire; wherein the third predetermined resistance value calculation formula is generated based on ohm's law.
The invention discloses a resistance detection device in a second aspect, which is applied to a controller, wherein the controller is connected with a circuit of an SCR management system; the circuit comprises a post-treatment heating main relay, a first resistor, a pressure pipe electric heating relay, a pump-to-nozzle heating wire and a second resistor; a first pin and a second pin of the controller are respectively connected with a coil and two ends of the post-treatment heating main relay, one end of a switch in the post-treatment heating main relay is connected with a first power supply through the first resistor, and the other end of the switch in the post-treatment heating main relay is connected with a sixth pin of the controller; a first pin and a third pin of the controller are respectively connected with two ends of a coil in the pressure pipe electric heating relay; one end of a switch in the pressure pipe electric heating relay is connected with the sixth pin through the pump to the mouth heating wire, the other end of the switch in the pressure pipe electric heating relay is grounded through the second resistor, and the device comprises:
the first closing instruction sending unit is used for sending a first closing instruction to the pressure pipe motor thermal relay after the engine is monitored to be started; when the engine is not started, the post-treatment heating main relay and the pressure pipe electric heating relay are both in an opening state;
the first receiving unit is used for receiving first information returned after the pressure pipe electric heating relay responds to the first closing instruction to execute a closing operation, and the first information represents that the pressure pipe electric heating relay is in a closed state;
the first acquisition unit is used for acquiring a first voltage at the sixth pin;
a first calculation unit for calculating the resistance of the pump-to-mouth heating wire based on the first voltage.
Optionally, the circuit further comprises a return pipe electric heating relay and a pump-to-tank heating wire; the first stitch and the fourth stitch of controller are respectively in the both ends of coil link to each other in the back flow electrical heating relay, the one end of switch passes through in the back flow electrical heating relay the pump to the case heater strip with the sixth stitch links to each other, the other end of switch passes through in the back flow electrical heating relay second resistance ground connection, the device still includes:
the first control unit is used for controlling the pressure pipe electric heating relay to be opened;
the second closing instruction sending unit is used for sending a second closing instruction to the return pipe electric heating relay, and the return pipe electric heating relay is in an opening state when the engine is not started;
the second receiving unit is used for receiving second information returned by the return pipe electric heating relay after responding to the second closing instruction to execute the closing operation, and the second information represents that the return pipe electric heating relay is in a closing state;
the second acquisition unit is used for acquiring a second voltage at the sixth pin;
a second calculation unit for calculating the resistance of the pump-to-tank heating wire based on the second voltage.
Optionally, the circuit further comprises a pipette electrical heating relay and a tank-to-pump heating wire; the first pin and the fifth pin of the controller are respectively connected with two ends of a coil in the pipette electric heating relay, one end of a switch in the pipette electric heating relay is connected with the sixth pin through the tank-to-pump heating wire, and the other end of the switch in the pipette electric heating relay is grounded through the second resistor, and the device further comprises:
the second control unit is used for controlling the opening of the electric heating relay of the liquid suction pipe;
a third closing instruction sending unit, configured to send a third closing instruction to the pipette electrical heating relay, where the pipette electrical heating relay is in an open state when the engine is not started;
the third receiving unit is used for receiving third information returned after the pipette electric heating relay responds to the third closing instruction to execute the closing operation, and the third information represents that the pipette electric heating relay is in a closed state;
the third acquisition unit is used for acquiring a third voltage at the sixth pin;
a third calculation unit for calculating the resistance of the tank to the pump heating wire based on the third voltage.
Optionally, a second power supply and a pull-up resistor are arranged in the sixth pin, and coils in the pressure pipe electric heating relay, the return pipe electric heating relay and the pipette electric heating relay are all connected to the second power supply through the pull-up resistor;
the first calculation unit includes:
the first obtaining unit is used for obtaining a voltage value of the second power supply, a resistance value of the pull-up resistor and a resistance value of the second resistor;
the resistance calculation unit is used for taking the first voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a first preset resistance calculation formula to obtain the resistance of the pump-to-mouth heating wire; wherein the first preset resistance value calculation formula is generated based on ohm's law.
Based on the resistance detection method and the resistance detection device provided by the embodiment of the invention, after the start of the engine is monitored, a first closing instruction is sent to the pressure pipe electric heating relay, when the engine is started, the post-processing heating main relay and the pressure pipe electric heating relay are both in an opening state, and then first information is returned after the pressure pipe electric heating relay is received to respond to the first closing instruction to execute the closing operation, wherein the first information represents that the pressure pipe electric heating relay is in a closing state, the first voltage at the sixth pin is collected, and the resistance value of the pump to the mouth for heating is calculated based on the first voltage. According to the technical scheme provided by the invention, the first closing instruction is sent to the pressure pipe electric heating relay, after first information returned after the pressure pipe electric heating relay responds to the first closing instruction to execute the closing operation is received, the first voltage at the sixth pin is collected, the resistance of the pump to the mouth heating wire is calculated based on the first voltage, the heating power P of the pump to the mouth heating wire can be accurately calculated by calculating the actual resistance of the pump to the mouth heating wire, namely the heating power of the pipeline heating resistance wire can be accurately calculated by calculating the actual resistance of the pipeline heating resistance wire in advance, and the SCR pipeline is further ensured to be completely unfrozen.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a circuit structure diagram of an SCR pipeline system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a resistance detection method according to an embodiment of the present invention;
fig. 3 is a structural diagram of an equivalent circuit according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a method for calculating the resistance of a pump-to-mouth heating wire according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of another resistance detection method according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart of a method for calculating the resistance of a pump to tank heater strip according to an embodiment of the present invention;
FIG. 7 is a schematic flow chart of another resistance detection method according to an embodiment of the present invention;
FIG. 8 is a schematic flow chart of a method for calculating the resistance from the tank to the pump heater strip according to an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a resistance detection apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In this application, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
As can be seen from the above background art, the resistance R of the heating resistance wire of the pipeline in the prior art is a standard quantity, so that if the pipeline is replaced during operation, the real resistance of the heating resistance wire of the pipeline changes, and the standard quantity cannot be automatically updated; and the real resistance value of the pipeline heating resistance wire can also be changed along with the aging of the pipeline heating resistance wire and other factors, and the standard quantity cannot be automatically updated at the moment. Because the standard quantity cannot be updated, the difference between the standard quantity and the real resistance value is often large, for example, the standard quantity is large, the integral time of the resistance wire is short, and theoretically, when the resistance wire is integrated to the energy W0, the actual situation may not be thawed, so that the normal work of the SCR post-treatment system is influenced, the pressure building failure is seriously caused, and the SCR post-treatment system is in failure.
Therefore, the invention discloses a resistance detection method and a resistance detection device, which are characterized in that the actual resistance of a pipeline heating wire is calculated in advance, the heating power P of a heating resistance wire is calculated based on the actual resistance of the pipeline heating wire, the heating power P of the heating resistance wire is integrated, and the SCR pipeline is defrosted when the integration reaches the energy W0.
The invention provides a resistance electrical measurement method and a resistance electrical measurement device, which are applied to a controller (Electronic control unit, ECU), wherein the ECU is connected with a circuit of an SCR pipeline system.
Referring to FIG. 1, a circuit diagram of an SCR piping system is shown, the circuit of the SCR piping system comprising: a post-treatment heating main relay, a first resistor R1, a pressure tube electrical heating relay, a pump to nozzle heating, a return tube electrical heating relay, a pump to tank heating wire, a pipette electrical heating relay, a tank to pump heating wire, and a second resistor R2.
The first pin X1 and the second pin X2 of the controller ECU are respectively connected with two ends of a coil in the post-treatment heating main relay, one end of a switch in the post-treatment heating main relay is connected with a first power supply Battery + through a first resistor R1, and the other end of the switch in the post-treatment heating main relay is connected with a sixth pin X6 of the controller ECU; a first pin X1 and a third pin X3 of the controller ECU are respectively connected with two ends of a coil in the pressure tube electric heating relay; one end of a switch in the pressure pipe electric heating relay is connected with a sixth pin X6 through a pump-to-nozzle heating wire, and the other end of the switch in the pressure pipe electric heating relay is connected with the first end of a second resistor R2; a first pin X1 and a fourth pin X4 of the controller ECU are respectively connected with two ends of a coil in a return pipe electric heating relay, one end of a switch in the return pipe electric heating relay is connected with a sixth pin X6 of the controller ECU through a pump-to-tank heating wire, and the other end of the switch in the return pipe electric heating relay is connected with a first end of a second resistor R2; the first pin X1 and the fifth pin X5 of the controller ECU are respectively connected with the two ends of a coil in the pipette electric heating relay, one end of a switch in the pipette electric heating relay is connected with a sixth pin of the controller ECU through a box-to-pump heating wire, the other end of the switch in the pipette electric heating relay is connected with the first end of a second resistor R2, and the second end of the second resistor R2 is grounded.
After the engine is started, under the condition that the post-processing heating main relay is not closed, the controller ECU controls the pressure pipe electric heating relay and the return pipe electric heating relay in the circuit of the SCR pipeline system, and the liquid suction pipe electric heating relay is closed in sequence, so that whether the circuit of the SCR pipeline system is short-circuited or not can be checked.
The invention provides a resistance detection method and a device, on the basis of not changing the original working flow and circuit structure of the circuit of an SCR pipeline system, a controller ECU controls a pressure pipe electric heating relay and a return pipe electric heating relay in a circuit diagram of the SCR pipeline system, a liquid suction pipe electric heating relay is closed in sequence, so that the resistance of a nozzle heating wire pumped to the SCR pipeline system corresponding to the pressure pipe electric heating relay, the resistance of a tank heating wire pumped to the return pipe electric heating relay corresponding to the return pipe electric heating relay and the resistance of a tank heating wire to the pump corresponding to the liquid suction pipe electric heating relay are calculated in sequence, the actual resistance value of a pipeline heating resistance wire is calculated, and finally, a main heating relay, the pressure pipe electric heating relay, the return pipe electric heating relay and the liquid suction pipe electric heating relay are closed and processed based on the actual resistance of the pipeline heating resistance wire calculated in advance, and the heating power P of the heating resistance wire of the pipeline is accurately calculated, so that the SCR pipeline is completely unfrozen.
It should be noted that the pipeline heating resistance wires refer to a pump-to-nozzle heating wire, a pump-to-tank heating wire and a tank-to-pump heating wire, and the SCR pipeline refers to a pressure pipe from a urea pump to a urea nozzle, a return pipe from the urea pump to a urea tank or a liquid suction pipe from the urea tank to the urea pump.
Furthermore, it should be noted that, based on the actual resistance of the pre-calculated pipeline heating resistance wire, the heating power P of the pipeline heating resistance wire is accurately calculated, and it is further ensured that the SCR pipeline is completely thawed, that is, the heating power P of the pump to the nozzle heating wire is accurately calculated based on the pre-calculated resistance of the pump to the nozzle heating wire, and it is further ensured that the pressure pipe of the urea pump to the urea nozzle is completely thawed, or the heating power P of the pump to the tank heating wire is accurately calculated based on the pre-calculated resistance of the pump to the tank heating wire, and it is further ensured that the return pipe of the urea pump to the urea tank is completely thawed, or the heating power P of the tank to the pump heating wire is accurately calculated based on the pre-calculated resistance of the tank to the pump heating wire, and it is further ensured that the urea tank is completely thawed to the pipette of the urea pump.
Based on the circuit diagram of the SCR pipeline system shown in fig. 1, an embodiment of the present invention provides a resistance electrical measurement method applied to a controller, and referring to fig. 2, a flow chart of the resistance detection method provided in the embodiment of the present invention is shown, where the resistance electrical measurement method includes the following steps:
s201: upon detection of engine start, a first close command is sent to the pressure tube electric heater.
It should be noted that, when the engine is not started, the post-processing heating main relay, the pressure pipe electric heating relay, the return pipe electric heating relay, and the pipette electric heating relay are all in an on state.
In the specific execution process of the step S201, whether the engine is started is monitored through the controller ECU, and when the engine is detected to be started, the controller ECU sends a first closing instruction to the pressure pipe electric heating relay through a circuit of the SCR pipeline system.
It should be noted that the first closing information may be a closing operation performed by the control pressure pipe electrical heating relay, and may be set according to practical references, and the embodiment of the present invention is not limited thereto.
S202: and receiving first information returned after the electric pressure pipe heater responds to the first closing command to perform the closing operation.
It should be noted that the first information indicates that the pressure tube electrical heating relay is in the closed state.
In the specific execution of step S202, it is determined that the pressure pipe electric heating relay is in the closed state by receiving first information returned after the pressure pipe electric heater performs the closing operation in response to the first closing command.
S203: a first voltage at the sixth pin is collected.
In the specific execution of step S203, the controller ECU acquires the first voltage at the sixth pin X6 after receiving the first information returned after the pressure tube electric heating relay performs the closing operation in response to the first instruction.
It should be noted that the sixth pin X6 has a built-in second power supply and a pull-up resistor Rp, and the pump-to-mouth heating wire is connected to the second power supply through the pull-up resistor Rp.
S204: the resistance of the pump to the mouth heating wire is calculated based on the first voltage.
In the specific implementation process, when the pressure pipe electrical heating relay is in the closed state, when the post-processing heating main relay, the return pipe electrical heating relay and the pipette electrical heating relay are all in the open state, obtain corresponding equivalent circuit and combine ohm's law to calculate the resistance of pumping to the mouth heater strip, refer to fig. 3, show an equivalent circuit structure diagram, this equivalent circuit includes: the device comprises a second power supply, a pull-up resistor Rp, a pipeline heating resistance wire Rx and a second resistor R2.
The second power supply is connected with one end of a pull-up resistor Rp, the other end of the pull-up resistor Rp is connected with one end of a pipeline heating resistance wire R x, the other end of the pipeline heating resistance wire Rx is connected with a first end of a second resistor R2, and a second end of the second resistor R2 is grounded.
It should be noted that the pipeline heating resistance line Rx at this time is a pump-to-mouth heating line, and the other end of the pull-up resistor Rp is connected to one end of the pipeline heating resistance line Rx, that is, the other end of the pull-up resistor Rp is connected to one end of the pump-to-mouth heating line.
Furthermore, it should be noted that a connection point at which the other end of the pull-up resistor Rp is connected to one end of the nozzle heating wire from the pump is a voltage collecting point, that is, a sixth pin X6 of the controller ECU is a voltage collecting point, and at this time, the first voltage can be obtained by collecting the voltage at the voltage collecting point.
In the process of specifically executing step S204, as shown in fig. 4, the method includes the following steps:
s401: and acquiring the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor.
S402: and taking the first voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a first preset resistance value calculation formula to obtain the resistor pumped to the mouth heating wire.
Wherein the first predetermined resistance value calculation formula is generated based on ohm's law.
Ohm's law states that in the same circuit, the current in a conductor is proportional to the voltage across the conductor and inversely proportional to the resistance of the conductor.
In a specific implementation process, the first voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor are used as input information of parameters in a first preset resistance value calculation formula, and the first preset resistance value calculation formula generated based on ohm's law is as follows:
Figure BDA0002113362570000101
wherein, Rx is the resistance value of the pipeline heating resistance wire Rx, i.e. the resistance pumped to the mouth heating wire, V is the voltage value of the first voltage, u is the voltage value of the second power supply, Rp is the resistance value of the pull-up resistor Rp, and R2 is the resistance value of the second resistor R2.
For example, when the voltage value of the second power supply is 5V, the resistance value of the pull-up resistor Rp is 20 ohms, and the resistance value of the second resistor R2 is 10 ohms, and the voltage value of the acquired first voltage is 3V, a first preset resistance value calculation formula generated based on the ohm law with the acquired first voltage, the voltage value of the first power supply, the resistance value of the pull-up resistor Rp, and the resistance value of the second resistor R2 as input information of parameters in the first preset resistance value calculation formula is as follows:
Figure BDA0002113362570000102
wherein Rx is the resistance of the pipeline heating resistance wire Rx, i.e. the resistance pumped to the mouth heating wire, so as to find that the resistance of the pipeline heating resistance wire Rx is 20 ohms, i.e. the resistance pumped to the mouth heating wire is 20 ohms.
According to the resistance detection method provided by the embodiment of the invention, after the starting of the engine is monitored, a first closing instruction is sent to the pressure pipe electric heating relay, the post-processing heating main relay and the pressure pipe electric heating relay are both in an opening state when the engine is started, then the first information is returned after the pressure pipe electric heating relay responds to the first closing instruction to execute the closing operation, the first information represents that the pressure pipe electric heating relay is in a closing state, the first voltage at the sixth pin is collected, and the resistance value of the heating from the pump to the nozzle is calculated based on the first voltage. According to the technical scheme provided by the invention, the first closing instruction is sent to the pressure pipe electric heating relay, after first information returned after the pressure pipe electric heating relay responds to the first closing instruction to execute the closing operation is received, the first voltage at the sixth pin is collected, the resistance of the pump to the mouth heating wire is calculated based on the first voltage, the heating power P of the pump to the mouth heating wire can be accurately calculated by calculating the actual resistance of the pump to the mouth heating wire, namely the heating power of the pipeline heating resistance wire can be accurately calculated by calculating the actual resistance of the pipeline heating resistance wire in advance, and the SCR pipeline is further ensured to be completely unfrozen.
On the basis of the electrical resistance measuring method disclosed above, as shown in fig. 5, the electrical resistance measuring method further includes the steps of:
s501: and controlling the pressure pipe electric heating relay to be opened.
In the specific execution of step S201, after calculating the resistance of the pump-to-mouth heating wire based on the first voltage, the controller ECU controls the pressure tube electric heating relay corresponding to the pump-to-mouth heating wire to be turned on.
S502: and sending a second closing instruction to the electric heating relay of the return pipe.
It should be noted that, when the engine is started, the return pipe electric heating relay is in an open state.
In the process of specifically executing step S502, the controller ECU sends a second closing command to the return pipe electric heating relay through the electric circuit of the SCR piping system.
It should be noted that the second closing command may be for controlling the return pipe electric heating relay to perform a closing operation, and may be set according to practical applications, and the embodiment of the present invention is not limited thereto.
S503: and receiving second information returned after the return pipe electric heating relay responds to the second closing instruction to execute the closing operation.
It should be noted that the second information indicates that the return pipe electric heating relay is in the closed state.
S504: a second voltage at the sixth pin is collected.
In the specific execution of step S504, the controller ECU acquires the second voltage at the sixth pin X6 after receiving the second information returned after the return pipe electric heating relay performs the closing operation in response to the second instruction.
It should be noted that the sixth pin X6 has a built-in second power supply and a pull-up resistor Rp, and the pump-to-tank heater wire is connected to the second power supply through the pull-up resistor Rp.
S505: the resistance of the pump to tank heater wire is calculated based on the second voltage.
In the specific implementation process, when back flow pipe electrical heating relay is in the closed state, when aftertreatment heating main relay, pressure pipe electrical heating relay and pipette electrical heating relay all are in the open mode, obtain corresponding equivalent circuit and combine ohm law to calculate the resistance of pumping to the case heater strip, refer to fig. 3, show an equivalent circuit structure diagram, and equivalent circuit includes: the device comprises a second power supply, a pull-up resistor Rp, a pipeline heating resistance wire Rx and a second resistor R2.
It should be noted that the pipeline heating resistance line Rx at this time is a pump-to-tank heating wire, and the other end of the pull-up resistor Rp is connected to one end of the pipeline heating resistance line Rx, that is, the other end of the pull-up resistor Rp is connected to one end of the pump-to-nozzle heating wire.
Furthermore, it should be noted that a connection point at which the other end of the pull-up resistor Rp is connected to one end of the tank heater strip from the pump is a voltage collection point, that is, a sixth pin X6 of the controller ECU is a voltage collection point, and at this time, a second voltage can be obtained by collecting a voltage at the voltage collection point.
In the process of specifically executing step S505, as shown in fig. 6, the method includes the following steps:
s601: and acquiring the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor.
S602: and taking the second voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a second preset resistance value calculation formula to obtain the resistor pumped to the box heating wire.
Wherein the second predetermined resistance value calculation formula is generated based on ohm's law.
For example, when the voltage value of the second power supply is 5V, the resistance value of the pull-up resistor Rp is 20 ohms, and the resistance value of the second resistor R2 is 10 ohms, and the acquired voltage value of the second voltage is 4V, a second preset resistance value calculation formula generated based on the ohm law with the acquired voltage value of the second power supply, the acquired voltage value of the first power supply, the acquired resistance value of the pull-up resistor Rp, and the acquired resistance value of the second resistor R2 as input information of parameters in the second preset resistance value calculation formula is as follows:
Figure BDA0002113362570000121
wherein Rx is the resistance of the pipeline heating resistance wire Rx, i.e. the resistance pumped to the tank heating wire, so as to find that the resistance of the pipeline heating resistance wire Rx is 70 ohms, i.e. the resistance pumped to the tank heating wire is 70 ohms.
In the embodiment of the invention, the pressure pipe electric heating relay is controlled to be opened, the second closing instruction is sent to the return pipe electric heating relay, the second information is returned after the return pipe electric heating relay responds to the second closing instruction to execute the closing operation, the second information represents that the return pipe electric heating relay is in the closed state, the second voltage at the sixth pin is collected, and the resistance value from the pump to the tank heating wire is calculated based on the second voltage. According to the technical scheme provided by the invention, a second closing instruction is sent to the return pipe electric heating relay, after second information returned after the return pipe electric heating relay responds to the second closing instruction to execute the closing operation is received, a second voltage at a sixth pin is collected, the resistance of the pump to the tank heating wire is calculated based on the second voltage, the heating power P of the pump to the tank heating wire can be accurately calculated by calculating the actual resistance of the pump to the tank heating wire, the return pipe of the urea pump to the urea tank is ensured to be completely unfrozen, and the SCR pipeline is further ensured to be completely unfrozen.
On the basis of the above-disclosed resistance detection methods of the present invention, as shown in fig. 7, the resistance detection method further includes the steps of:
s701: and controlling the opening of the electric heating relay of the return pipe.
In the specific execution of step S701, after calculating the resistance of the pump-to-tank heating wire based on the second voltage, the controller ECU controls the return pipe electric heating relay corresponding to the pump-to-tank heating wire to be turned on.
S702: sending a third close command to the pipette electrical heating relay.
In specifically executing step S702, the controller ECU sends a third closing command to the return pipe motor thermal relay through the electric circuit of the SCR piping system.
It should be noted that the third closing instruction may be for controlling the pipette electrical heating relay to perform a closing operation, and may be set according to practical applications, and the embodiment of the present invention is not limited thereto.
S703: and receiving third information returned after the pipette electric heating relay responds to the third closing instruction to execute the closing operation.
It should be noted that the third information indicates that the pipette electrical heating relay is in the closed state.
S704: a third voltage is collected at the sixth pin.
In the specific execution of step S703, the controller ECU acquires the third voltage at the sixth pin X6 after receiving the third information returned after the pipette electric heating relay performs the closing operation in response to the third instruction.
It should be noted that the sixth pin X6 has a built-in second power supply and a pull-up resistor Rp, and the tank-to-pump heating wire is connected to the second power supply through the pull-up resistor Rp.
S705: the resistance of the tank to the pump heating wire is calculated based on the third voltage.
In the specific implementation process, when pipette electrical heating relay is in the closed state, when aftertreatment heating main relay, back flow electric heating relay and pressure pipe electrical heating relay all are in the open state, obtain corresponding equivalent circuit and combine ohm law to calculate the resistance of case to the pump heater strip, refer to fig. 3, show an equivalent circuit structure diagram, and equivalent circuit includes: the device comprises a second power supply, a pull-up resistor Rp, a pipeline heating resistance wire Rx and a second resistor R2.
It should be noted that the pipeline heating resistance line Rx at this time is a tank-to-pump heating wire, and the other end of the pull-up resistor Rp is connected to one end of the pipeline heating resistance line Rx, that is, the other end of the pull-up resistor Rp is connected to one end of the tank-to-pump heating wire.
Furthermore, it should be noted that a connection point where the other end of the pull-up resistor Rp and the other end of the pull-up resistor Rp are connected to one end of the tank to the pump heating wire is a voltage collection point, that is, a sixth pin X6 of the controller ECU is a voltage collection point, and at this time, a third voltage can be obtained by collecting a voltage at the voltage collection point.
In the process of specifically executing step S705, as shown in fig. 8, the method includes the following steps:
s801: and acquiring the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor.
S802: and taking the third voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a third preset resistance value calculation formula to obtain the resistor from the tank to the pump heating wire.
Wherein the third predetermined resistance value calculation formula is generated based on ohm's law.
For example, when the voltage value of the second power supply is 5V, the resistance value of the pull-up resistor Rp is 20 ohms, and the resistance value of the second resistor R2 is 10 ohms, and the acquired voltage value of the second voltage is 2.5V, a second preset resistance value calculation formula generated based on the ohm law with the acquired third voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor Rp, and the resistance value of the second resistor R2 as input information of parameters in a third preset resistance value calculation formula is as follows:
Figure BDA0002113362570000141
wherein Rx is the resistance of the pipeline heating resistance wire Rx, i.e. the resistance from the tank to the pump heating wire, so as to obtain the resistance of the pipeline heating resistance wire Rx as 10 ohms, i.e. the resistance from the tank to the pump heating wire as 10 ohms.
In the embodiment of the invention, the return pipe electric heating relay is controlled to be started, a third closing instruction is sent to the pipette electric heating relay, and then third information is returned after the pipette electric heating relay responds to the third closing instruction to execute closing operation. According to the technical scheme provided by the invention, the third closing instruction is sent to the electric heating relay of the liquid suction pipe, after third information returned after the electric heating relay of the liquid suction pipe responds to the third closing instruction to execute the closing operation is received, the third voltage at the sixth pin is collected, the resistance of the pump to the box heating wire is calculated based on the third voltage, the heating power P from the box to the pump heating wire can be accurately calculated by calculating the actual resistance from the box to the pump heating wire, namely the heating power of the pipeline heating resistance wire can be accurately calculated by calculating the actual resistance of the pipeline heating resistance wire in advance, and the SCR pipeline is further ensured to be completely unfrozen.
The embodiment of the invention provides a resistance electrical measuring device corresponding to the resistance detecting method disclosed by the embodiment of the invention, and the resistance detecting device is realized based on the connection between the controller ECU and the circuit of the SCR pipeline system.
As shown in fig. 9, a schematic structural diagram of a resistance detection apparatus according to an embodiment of the present invention is provided, where the apparatus 900 includes:
a first closing instruction sending unit 901, configured to send a first closing instruction to a pressure tube motor thermal relay after it is monitored that the engine is started; when the engine is not started, the post-processing heating main relay and the pressure pipe electric heating relay are both in an opening state.
The first receiving unit 902 is configured to receive first information returned after the pressure pipe electric heating relay performs the closing operation in response to the first closing command, where the first information indicates that the pressure pipe electric heating relay is in the closed state.
And a first collecting unit 903 for collecting the first voltage at the sixth pin.
A first calculation unit 904 for calculating the resistance of the pump to the mouth heating wire based on the first voltage.
The specific principle and the implementation process of each unit in the resistance detection apparatus disclosed in the above embodiment of the present invention are the same as those of the resistance detection method disclosed in the above embodiment of the present invention, and reference may be made to corresponding parts in the resistance detection method disclosed in the above embodiment of the present invention, which are not described herein again.
According to the resistance detection device provided by the embodiment of the invention, after the start of an engine is monitored through the first closing instruction sending unit, the first closing instruction is sent to the pressure pipe electric heating relay, the postprocessing heating main relay and the pressure pipe electric heating relay are both in an opening state when the engine is started, the first receiving unit receives the first information returned after the pressure pipe electric heating relay responds to the first closing instruction to execute the closing operation, the first information represents that the pressure pipe electric heating relay is in a closing state, the first collecting unit collects the first voltage at the sixth pin, and the first calculating unit calculates the resistance value heated from the pump to the nozzle based on the first voltage. According to the technical scheme provided by the invention, the first closing instruction is sent to the pressure pipe electric heating relay, after first information returned after the pressure pipe electric heating relay responds to the first closing instruction to execute the closing operation is received, the first voltage at the sixth pin is collected, the resistance of the pump to the mouth heating wire is calculated based on the first voltage, the heating power P of the pump to the mouth heating wire can be accurately calculated by calculating the actual resistance of the pump to the mouth heating wire, namely the heating power of the pipeline heating resistance wire can be accurately calculated by calculating the actual resistance of the pipeline heating resistance wire in advance, and the SCR pipeline is further ensured to be completely unfrozen.
Preferably, the resistance detection device further includes:
and the first control unit 905 is used for controlling the opening of the pressure pipe electric heating relay.
And a second closing instruction sending unit 906, configured to send a second closing instruction to the return pipe electric heating relay, where the return pipe electric heating relay is in an open state when the engine is not started.
The second receiving unit 907 is configured to receive second information returned after the return pipe electric heating relay performs a closing operation in response to the second closing instruction, where the second information indicates that the return pipe electric heating relay is in a closed state.
A second collecting unit 908 for collecting a second voltage at the sixth pin.
A second calculation unit 909 for calculating the resistance of the pump to tank heating wire based on the second voltage.
In the embodiment of the invention, the first control unit is used for controlling the pressure pipe electric heating relay to be opened, the second closing instruction sending unit is used for sending a second closing instruction to the return pipe electric heating relay, the second receiving unit is used for receiving second information returned after the return pipe electric heating relay responds to the second closing instruction to execute closing operation, the second information represents that the return pipe electric heating relay is in a closed state, the second collecting unit is used for collecting second voltage at a sixth pin, and the second calculating unit is used for calculating the resistance value of the pump to the box heating wire based on the second voltage. According to the technical scheme provided by the invention, the second closing instruction is sent to the return pipe electric heating relay, after second information returned after the return pipe electric heating relay responds to the second closing instruction to execute the closing operation is received, the second voltage at the sixth pin is collected, the resistance of the pump to the box heating wire is calculated based on the second voltage, the heating power P of the pump to the box heating wire can be accurately calculated by calculating the actual resistance of the pump to the box heating wire, namely the heating power of the pipeline heating resistance wire can be accurately calculated by calculating the actual resistance of the pipeline heating resistance wire in advance, and the SCR pipeline is further ensured to be completely unfrozen.
Preferably, the resistance detection device further includes:
and the second control unit 9010 is used for controlling the opening of the pipette electric heating relay.
And a third closing instruction sending unit 9011, configured to send a third closing instruction to the pipette electrical heating relay, where the pipette electrical heating relay is in an on state when the engine is not started.
The third receiving unit 9012 is configured to receive third information returned after the pipette electrical heating relay performs a closing operation in response to the third closing instruction, where the third information indicates that the pipette electrical heating relay is in a closed state;
and the third acquisition unit 9013 is configured to acquire a third voltage at the sixth pin.
A third calculation unit 9014 for calculating the resistance of the tank to the pump heating wire based on the third voltage.
In the embodiment of the invention, the return pipe electric heating relay is controlled to be opened by the second control unit, the third closing instruction is sent to the pipette electric heating relay by the third closing instruction sending unit, the third receiving unit receives third information which indicates that the pipette electric heating relay is in a closed state after the pipette electric heating relay responds to the third closing instruction to execute the closing operation, the third information returns, the third voltage at the sixth pin is collected by the third collecting unit, and the resistance value from the box to the pump heating wire is calculated by the third calculating unit based on the third voltage. According to the technical scheme provided by the invention, the third closing instruction is sent to the electric heating relay of the liquid suction pipe, after third information returned after the electric heating relay of the liquid suction pipe responds to the third closing instruction to execute the closing operation is received, the third voltage at the sixth pin is collected, the resistance of the pump to the box heating wire is calculated based on the third voltage, the heating power P from the box to the pump heating wire can be accurately calculated by calculating the actual resistance from the box to the pump heating wire, namely the heating power of the pipeline heating resistance wire can be accurately calculated by calculating the actual resistance of the pipeline heating resistance wire in advance, and the SCR pipeline is further ensured to be completely unfrozen.
Preferably, the first calculating unit 904 includes:
and the first acquisition unit is used for acquiring the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor.
The resistance calculation unit is used for taking the first voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a first preset resistance calculation formula to obtain the resistance pumped to the mouth heating wire; wherein the first predetermined resistance value calculation formula is generated based on ohm's law.
Preferably, the second calculating unit 909 includes:
and the second acquisition unit is used for acquiring the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor.
The resistance calculation unit is used for taking the second voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a second preset resistance calculation formula to obtain the resistance pumped to the box heating wire; wherein the second predetermined resistance value calculation formula is generated based on ohm's law.
Preferably, the third calculation unit 9014 includes:
and the third acquisition unit is used for acquiring the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor.
The resistance calculation unit is used for taking the third voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a third preset resistance calculation formula to obtain the resistance from the tank to the pump heating wire; wherein the third predetermined resistance value calculation formula is generated based on ohm's law.
The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, the system or system embodiments are substantially similar to the method embodiments and therefore are described in a relatively simple manner, and reference may be made to some of the descriptions of the method embodiments for related points. The above-described system and system embodiments are only illustrative, wherein the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The foregoing is only a preferred embodiment of the present application and it should be noted that those skilled in the art can make several improvements and modifications without departing from the principle of the present application, and these improvements and modifications should also be considered as the protection scope of the present application.

Claims (10)

1. The resistance detection method is characterized by being applied to a controller, wherein the controller is connected with a circuit of an SCR pipeline system; the circuit comprises a post-treatment heating main relay, a first resistor, a pressure pipe electric heating relay, a pump-to-nozzle heating wire and a second resistor; a first pin and a second pin of the controller are respectively connected with two ends of a coil in the post-treatment heating main relay, one end of a switch in the post-treatment heating main relay is connected with a first power supply through the first resistor, and the other end of the switch in the post-treatment heating main relay is connected with a sixth pin of the controller; a first pin and a third pin of the controller are respectively connected with two ends of a coil in the pressure pipe electric heating relay; one end of a switch in the pressure pipe electric heating relay is connected with the sixth pin through the pump-to-mouth heating wire, the other end of the switch in the pressure pipe electric heating relay is grounded through the second resistor, a second power supply and a pull-up resistor are arranged in the sixth pin, the pump-to-mouth heating wire is connected with the second power supply through the pull-up resistor, and the method comprises the following steps:
after the engine is monitored to be started, sending a first closing instruction to the pressure pipe electric heating relay; when the engine is not started, the post-treatment heating main relay and the pressure pipe electric heating relay are both in an opening state;
receiving first information returned by the pressure pipe electric heating relay after the pressure pipe electric heating relay responds to the first closing instruction to execute closing operation, wherein the first information represents that the pressure pipe electric heating relay is in a closed state;
collecting a first voltage at the sixth pin;
calculating the resistance of the pump-to-mouth heating wire based on the first voltage.
2. The method of claim 1, wherein the electrical circuit further comprises a return line electrical heating relay and a pump-to-tank heating wire; the first pin and the fourth pin of the controller are respectively connected with two ends of a coil in the return pipe electric heating relay, one end of a switch in the return pipe electric heating relay is connected with the sixth pin through the pump-to-box heating wire, and the other end of the switch in the return pipe electric heating relay is grounded through the second resistor, and the method further comprises the following steps:
controlling the pressure pipe electric heating relay to be opened;
sending a second closing instruction to the return pipe electric heating relay, wherein the return pipe electric heating relay is in an opening state when the engine is not started;
receiving second information returned by the return pipe electric heating relay after responding to the second closing instruction to execute closing operation, wherein the second information represents that the return pipe electric heating relay is in a closed state;
collecting a second voltage at the sixth pin;
calculating the resistance of the pump-to-tank heating wire based on the second voltage.
3. The method of claim 1, wherein the circuit further comprises a pipette electrical heating relay and a tank-to-pump heating wire; the first pin and the fifth pin of the controller are respectively connected with two ends of a coil in the pipette electric heating relay, one end of a switch in the pipette electric heating relay is connected with the sixth pin through the tank-to-pump heating wire, and the other end of the switch in the pipette electric heating relay is grounded through the second resistor, and the method further comprises the following steps:
controlling the opening of an electric heating relay of the return pipe;
sending a third closing instruction to the pipette electrical heating relay, wherein the pipette electrical heating relay is in an open state when the engine is not started;
receiving third information returned by the pipette electric heating relay after responding to the third closing instruction to execute the closing operation, wherein the third information represents that the pipette electric heating relay is in a closed state;
collecting a third voltage at the sixth pin;
calculating the resistance of the tank to the pump heating wire based on the third voltage.
4. The method of claim 3, wherein the sixth pin houses a second power source and a pull-up resistor, the pump-to-mouth heater wire, the pump-to-tank heater wire, and the tank-to-pump heater wire all being connected to the second power source through the pull-up resistor;
the calculating the resistance of the pump-to-mouth heating wire based on the first voltage includes:
acquiring a voltage value of the second power supply, a resistance value of the pull-up resistor and a resistance value of the second resistor;
taking the first voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a first preset resistance value calculation formula to obtain the resistor of the pump-to-mouth heating wire; wherein the first preset resistance value calculation formula is generated based on ohm's law.
5. The method of claim 4, wherein said calculating the resistance of the pump-to-tank heating wire based on the second voltage comprises:
acquiring a voltage value of the second power supply, a resistance value of the pull-up resistor and a resistance value of the second resistor;
taking the second voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a second preset resistance value calculation formula to obtain the resistor of the pump-to-tank heating wire; wherein the second preset resistance value calculation formula is generated based on ohm's law.
6. The method of claim 5, wherein said calculating the resistance of the tank to the pump heating wire based on the third voltage comprises:
acquiring a voltage value of the second power supply, a resistance value of the pull-up resistor and a resistance value of the second resistor;
taking the third voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a third preset resistance value calculation formula to obtain the resistor from the tank to the pump heating wire; wherein the third predetermined resistance value calculation formula is generated based on ohm's law.
7. The resistance detection device is applied to a controller, and the controller is connected with a circuit of an SCR management system; the circuit comprises a post-treatment heating main relay, a first resistor, a pressure pipe electric heating relay, a pump-to-nozzle heating wire and a second resistor; a first pin and a second pin of the controller are respectively connected with a coil and two ends of the post-treatment heating main relay, one end of a switch in the post-treatment heating main relay is connected with a first power supply through the first resistor, and the other end of the switch in the post-treatment heating main relay is connected with a sixth pin of the controller; a first pin and a third pin of the controller are respectively connected with two ends of a coil in the pressure pipe electric heating relay; one end of a switch in the pressure pipe electric heating relay is connected with the sixth pin through the pump to the mouth heating wire, the other end of the switch in the pressure pipe electric heating relay is grounded through the second resistor, a second power supply and a pull-up resistor are arranged in the sixth pin, the pump to the mouth heating wire is connected with the second power supply through the pull-up resistor, and the device comprises:
the first closing instruction sending unit is used for sending a first closing instruction to the pressure pipe motor thermal relay after the engine is monitored to be started; when the engine is not started, the post-treatment heating main relay and the pressure pipe electric heating relay are both in an opening state;
the first receiving unit is used for receiving first information returned after the pressure pipe electric heating relay responds to the first closing instruction to execute a closing operation, and the first information represents that the pressure pipe electric heating relay is in a closed state;
the first acquisition unit is used for acquiring a first voltage at the sixth pin;
a first calculation unit for calculating the resistance of the pump-to-mouth heating wire based on the first voltage.
8. The apparatus of claim 7, wherein the circuit further comprises a return line electrical heating relay and a pump-to-tank heating wire; the first stitch and the fourth stitch of controller are respectively in the both ends of coil link to each other in the back flow electrical heating relay, the one end of switch passes through in the back flow electrical heating relay the pump to the case heater strip with the sixth stitch links to each other, the other end of switch passes through in the back flow electrical heating relay second resistance ground connection, the device still includes:
the first control unit is used for controlling the pressure pipe electric heating relay to be opened;
the second closing instruction sending unit is used for sending a second closing instruction to the return pipe electric heating relay, and the return pipe electric heating relay is in an opening state when the engine is not started;
the second receiving unit is used for receiving second information returned by the return pipe electric heating relay after responding to the second closing instruction to execute the closing operation, and the second information represents that the return pipe electric heating relay is in a closing state;
the second acquisition unit is used for acquiring a second voltage at the sixth pin;
a second calculation unit for calculating the resistance of the pump-to-tank heating wire based on the second voltage.
9. The apparatus of claim 7, wherein the circuit further comprises a pipette electrical heating relay and a tank-to-pump heating wire; the first pin and the fifth pin of the controller are respectively connected with two ends of a coil in the pipette electric heating relay, one end of a switch in the pipette electric heating relay is connected with the sixth pin through the tank-to-pump heating wire, and the other end of the switch in the pipette electric heating relay is grounded through the second resistor, and the device further comprises:
the second control unit is used for controlling the opening of the electric heating relay of the liquid suction pipe;
a third closing instruction sending unit, configured to send a third closing instruction to the pipette electrical heating relay, where the pipette electrical heating relay is in an open state when the engine is not started;
the third receiving unit is used for receiving third information returned after the pipette electric heating relay responds to the third closing instruction to execute the closing operation, and the third information represents that the pipette electric heating relay is in a closed state;
the third acquisition unit is used for acquiring a third voltage at the sixth pin;
a third calculation unit for calculating the resistance of the tank to the pump heating wire based on the third voltage.
10. The apparatus as claimed in claim 9, wherein the sixth pin is built in with a second power supply and a pull-up resistor, and the coils in the pressure pipe electric heating relay, the return pipe electric heating relay and the pipette electric heating relay are all connected to the second power supply through the pull-up resistor;
the first calculation unit includes:
the first obtaining unit is used for obtaining a voltage value of the second power supply, a resistance value of the pull-up resistor and a resistance value of the second resistor;
the resistance calculation unit is used for taking the first voltage, the voltage value of the second power supply, the resistance value of the pull-up resistor and the resistance value of the second resistor as input information of parameters in a first preset resistance calculation formula to obtain the resistance of the pump-to-mouth heating wire; wherein the first preset resistance value calculation formula is generated based on ohm's law.
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