CN108973685B - Delayed power-off control circuit and method for fuel cell new energy bus - Google Patents
Delayed power-off control circuit and method for fuel cell new energy bus Download PDFInfo
- Publication number
- CN108973685B CN108973685B CN201710408220.1A CN201710408220A CN108973685B CN 108973685 B CN108973685 B CN 108973685B CN 201710408220 A CN201710408220 A CN 201710408220A CN 108973685 B CN108973685 B CN 108973685B
- Authority
- CN
- China
- Prior art keywords
- power supply
- power
- vehicle
- low
- signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0046—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to electric energy storage systems, e.g. batteries or capacitors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
- B60R16/033—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for characterised by the use of electrical cells or batteries
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Transportation (AREA)
- Automation & Control Theory (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a delay power-off control circuit for a fuel cell new energy bus, which is connected with a vehicle control unit, wherein the vehicle control unit outputs a delay power-off signal by detecting a normal power-off signal of each part of the bus. The delayed power-off control circuit is provided with the following units: the first low-voltage power supply unit and the second low-voltage power supply unit provide low-voltage power supply for the vehicle through the control of the low-voltage power supply feedback signal; the delayed power-off control unit controls the on-off of the first-gear power supply signal, outputs a low-voltage power supply feedback signal according to the state of the received delayed power-off signal and realizes delayed power-off of the vehicle; and the power control unit of the vehicle controller provides a double-path power supply controlled by the first-gear power signal and the delayed power-off signal for the vehicle controller by utilizing the voltage output by the second low-voltage power supply unit. The invention ensures the high-low voltage power supply stability of the fuel cell vehicle with the double-storage-battery voltage platform and the driving safety of the vehicle in abnormal power failure.
Description
Technical Field
The invention relates to the field of fuel cell new energy passenger cars with double storage battery voltage platforms, in particular to a delay power-off control circuit and method of a fuel cell new energy passenger car with double storage battery voltage platforms.
Background
Nowadays, facing two problems of environmental pollution and lack of petroleum resources, green and environment-friendly energy-saving new energy passenger cars are more and more emphasized by various countries, and environmental protection and energy conservation are an important development direction of automobile technology in the 21 st century. Meanwhile, emission regulations of various countries are becoming stricter, and the fuel cell new energy passenger car is a green novel environment-friendly passenger car with the characteristics of zero emission and no pollution.
In the prior art in the field of fuel cell new energy passenger cars, a control method of a fuel cell new energy passenger car power supply aiming at a storage battery voltage platform has no abnormal power-off protection strategy.
Disclosure of Invention
One of the technical problems to be solved by the invention is to provide a delay power-off control circuit and method for a fuel cell new energy bus with a double-storage-battery voltage platform, wherein the control circuit realizes that after the fuel cell new energy bus is powered off, a whole vehicle controller controls the power-off sequence and time of high and low voltages according to power-off response signals of each part of the vehicle such as a fuel cell stack system and the like, so that the high-low voltage safety of the fuel cell stack system and other parts of the vehicle is ensured, and the problem that the fuel cell stack cannot be shut down in time due to the slow response time of the fuel cell stack when the vehicle is powered off is avoided, and the generated high voltage damages other power-using parts.
In order to solve the above technical problem, the present invention provides a delay power-off control circuit for a fuel cell new energy bus, the delay power-off control circuit comprising: the low-voltage power supply control system comprises a first low-voltage power supply unit and a second low-voltage power supply unit which are connected with each other, wherein each group of low-voltage power supply units respectively comprise a storage battery power supply, a power supply control switch connected with the storage battery power supply and a power supply relay connected with the power supply control switch, each power supply relay respectively receives a low-voltage power supply feedback control signal, is combined with the corresponding group of power supply control switches, outputs a first low-voltage power supply and a second low-voltage power supply with different numerical values and provides a whole vehicle low-voltage power supply for a vehicle, and the low-voltage power supply feedback signals control the on-off state of the power supply relays; the delayed power-off control unit is connected with the first low-voltage power supply unit and the second low-voltage power supply unit, controls the on-off of a first-gear power supply signal, and outputs a low-voltage power supply feedback signal according to the state of the received delayed power-off signal so as to realize the delayed power-off of the first low-voltage power supply unit and the second low-voltage power supply unit; the vehicle control unit is connected with the delayed power-off control unit, outputs the delayed power-off signal according to the on-off state of the received first-gear power signal when the vehicle control unit is powered on, and outputs the delayed power-off signal state according to the on-off state of the first-gear power signal and the received normal power-off signals of all components of the vehicle when the vehicle control unit is powered off normally and abnormally; and the power control unit of the whole vehicle controller is connected with the delayed power-off control unit and the whole vehicle controller, receives the delayed power-off signal and the first-gear power signal, and provides a single-path or double-path power supply for the whole vehicle controller by using the voltage output by the second low-voltage power supply unit.
Preferably, the vehicle control unit power control unit includes: and the first vehicle control circuit is connected with the second low-voltage power supply unit, the delayed power-off control unit and the vehicle controller, and the on-off of the circuit is realized according to the on-off state of the first-gear power supply signal, so that the power of the vehicle controller supplies power to the vehicle controller.
Preferably, the vehicle control unit power supply control unit further includes: and the second vehicle control circuit is connected with the second low-voltage power supply unit, the delayed power-off control unit and the vehicle controller, and the on-off of the circuit is realized according to the state of the delayed power-off signal, so that the second low-voltage power supply supplies power to the vehicle controller.
Preferably, the vehicle power supply comprises a vehicle low-voltage power supply and a vehicle high-voltage power supply, and the vehicle low-voltage power supply needs to output the first low-voltage power supply signal, the second low-voltage power supply signal and the vehicle controller power supply signal at the same time; and the vehicle control unit controls the vehicle high-voltage power supply.
Preferably, the first vehicle control circuit comprises a first vehicle control relay and a vehicle controller current limiting device connected with the first vehicle control relay; the second vehicle control circuit comprises a second vehicle power supply relay, and the second vehicle power supply relay is connected with the vehicle controller current limiting device.
Preferably, the delayed power-off control unit comprises a first-gear power switch, a first-gear power relay connected with the first-gear power switch, and a delayed power-off relay connected with the first-gear power relay.
Preferably, the delayed power-off control unit can also receive a delayed power-off signal, control the on-off of the first-gear power relay or the delayed power-off relay according to the state of the delayed power-off signal, and output the low-voltage power feedback control signal.
In another aspect, a delayed power-off control method for a fuel cell new energy passenger car is provided, wherein the new energy passenger car has a dual-battery voltage platform and is implemented on a delayed power-off control circuit, and the method comprises the following steps: in the power-on process, power supply control switches of the first low-voltage power supply unit and the second low-voltage power supply unit are closed, a normally closed contact of the time delay relay (K1) is closed, the first-gear power supply relay (K2) is electrified, a normally open contact of the first-gear power supply relay is closed, the first-gear power supply switch (A2) is closed, the whole vehicle controller is electrified, power supply relays (K3, K4) of the first low-voltage power supply unit and the second low-voltage power supply are closed, and the whole vehicle low-voltage power supply is electrified; the vehicle control unit outputs the delayed power-off signal after detecting a first-gear power supply signal, the normally closed contact of the delay relay (K1) is disconnected, the normally open contact is closed, the normally open contact of the first-gear power supply relay (K2) is disconnected, and the power supply of the vehicle is electrified.
Preferably, the delayed power-off control method further includes the steps of: and in the normal power-off process, a first-gear power switch (A2) is switched off, the vehicle control unit switches off the delayed power-off signal when detecting that the first-gear power signal is switched off and normal power-off signals of all parts of the vehicle are switched off, and the vehicle power supply is powered on.
Preferably, the delayed power-off control method further includes the steps of: in the abnormal power-off process, the vehicle controller detects that the first-gear power supply signal is disconnected and outputs the delayed power-off signal, and normal operation of each part of the vehicle is ensured through closing of a normally open contact of the delayed power-off relay (K1); and after the vehicle controller detects normal power-off signals of all parts of the vehicle, the vehicle controller disconnects the delayed power-off signals, disconnects the vehicle power supply and disconnects the power control switches of the first low-voltage power supply unit and the second low-voltage power supply unit.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
the invention adopts a method for controlling the normally open and normally closed interface of the relay through a relevant logic strategy, thereby not only realizing the delayed power-off function of the vehicle, but also ensuring that all parts of the vehicle with high voltage and low voltage continue to stably work under the condition of abnormal power-off, and further ensuring the safe driving of the vehicle.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram illustrating connection relationships among components of a fuel cell new energy bus with a dual-battery voltage platform according to an embodiment of the present application.
Fig. 2 is a schematic structural diagram of a delayed power-off control circuit of a fuel cell new energy bus according to an embodiment of the present application.
Fig. 3 is a schematic diagram of the first low-voltage power supply unit 21, the second low-voltage power supply unit 22, and the delayed power-off control unit 23 in the delayed power-off control circuit according to the embodiment of the present application.
Fig. 4 is a schematic diagram of the vehicle control unit power control unit 24 in the delayed power-off control circuit according to the embodiment of the present application.
FIG. 5 shows a delayed power-off control method for a fuel cell new energy bus according to an embodiment of the application.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
In order to overcome the defects in the prior art, the embodiment provides a power supply control method for a fuel cell passenger car with a double-battery voltage platform. The method ensures the continuous power supply of the vehicle controller by utilizing the power-on and power-off sequence of the plurality of relays, thereby controlling the power-on and power-off states of the power supplies of all parts of the high voltage and the low voltage of the vehicle by detecting the output condition of the delayed power-off signal of the vehicle controller, ensuring the safe driving of the vehicle and avoiding the condition that the parts of the vehicle are damaged by abnormal high voltage.
FIG. 1 is a schematic diagram illustrating connection relationships among components of a fuel cell new energy bus with a dual-battery voltage platform according to an embodiment of the present application. In this embodiment, the entire vehicle power supply is divided into an entire vehicle low-voltage power supply and an entire vehicle high-voltage power supply, wherein the provision of the entire vehicle low-voltage power supply needs to complete the output of the first low-voltage power supply signal, the second low-voltage power supply signal and the entire vehicle controller power supply signal at the same time. The following describes the power supply of the high-voltage and low-voltage components of the vehicle with reference to fig. 1. On one hand, the double-storage-battery voltage platform comprises a first storage battery power supply (the voltage range of the first storage battery power supply is 8-18V) and a second storage battery power supply (the voltage range of the second storage battery power supply is 18-32V), is one part of a delayed power-off control circuit and provides 12V low voltage and 24V low voltage for a system low-voltage distribution box, and the system low-voltage distribution box provides power for low-voltage components of a vehicle to ensure the normal operation of the low-voltage components of the vehicle; on the other hand, the vehicle controller power is supplied by a second battery power (24V low voltage). Note that, in the present embodiment, the 12V battery is a specific example of the first battery power source (the first low-voltage power source is provided by the first battery power source), and the 24V battery is a specific example of the second battery power source (the second low-voltage power source is provided by the second battery power source).
In addition, referring to fig. 1, the control of the whole vehicle high-voltage power supply is realized by controlling the input and output of the 24V low-voltage power supply of the whole vehicle by using the whole vehicle controller, and the low-voltage 24V power supply signal controls the on-off of the high-voltage large-current contactor of the high-voltage component in the vehicle control system, and indirectly controls the on-off of the high-voltage component of the vehicle. Therefore, in order to ensure the normal operation of the high-voltage and low-voltage components of the vehicle, the vehicle controller of the vehicle needs to be continuously supplied with power.
It should be noted that, in order to ensure the driving safety of the vehicle by integrating the power supply source conditions of the whole vehicle low-voltage power supply and the whole vehicle high-voltage power supply, on one hand, when the vehicle is abnormally powered off, the system low-voltage distribution box and the whole vehicle controller need to be continuously supplied with power; on the other hand, when the vehicle is normally powered off, the low-voltage distribution box and the vehicle controller device of the system are subjected to delayed power-off operation.
The vehicle control unit is a core component of vehicle operation, and after the vehicle control unit is powered on, the vehicle control unit can detect a first-gear power signal and a second-gear power signal, wherein the first-gear power signal is powered on by low voltage (where the low voltage is 24V normal fire provided by the second storage battery power supply), and the second-gear power signal is powered on by high voltage (where the voltage of the power battery system of the new energy bus is generally more than 300V, and the high voltage refers to high voltage of the power battery system). In addition, the vehicle control unit communicates with a plurality of vehicle high-voltage components through a CAN network, thereby acquiring relevant information. In this embodiment, the vehicle control unit determines whether the delayed power-off signal can be output according to the received and analyzed communication information of each high-voltage component, and further realizes the delayed power-off function of the vehicle based on the delayed power-off control circuit.
Fig. 2 is a schematic structural diagram of a delayed power-off control circuit of a fuel cell new energy passenger car according to an embodiment of the present application, where the control circuit includes the following units: the system comprises a first low-voltage power supply unit 21, a second low-voltage power supply unit 22, a delayed power-off control unit 23 and a vehicle control unit power supply control unit 24. Fig. 3 is a schematic diagram of a first low-voltage power supply unit 21, a second low-voltage power supply unit 22, and a delayed power-off control unit 23 in the delayed power-off control circuit according to the embodiment of the present application, and fig. 4 is a schematic diagram of a vehicle controller power supply control unit 24 in the delayed power-off control circuit according to the embodiment of the present application. Specifically, referring to fig. 2 and 3, a first low voltage power supply unit 21, which includes a first battery power supply, a first power control switch connected in series with the first battery power supply, and a first power relay connected in series with the first power control switch, receives a low voltage power supply feedback control signal, and in parallel with the first power switch, outputs a first low voltage power supply provided by the first battery power supply, wherein the low voltage power supply feedback signal controls the on-off state of the first power relay; a second low-voltage power supply unit 22 including a second secondary battery power supply, a second power supply control switch connected in series with the second secondary battery power supply, and a second power supply relay connected in series with the second power supply control switch, the second power supply relay receiving a low-voltage power supply feedback control signal, and connecting the second power supply switch in parallel, and outputting a second low-voltage power supply supplied from the second secondary battery power supply, wherein the low-voltage power supply feedback signal controls an on-off state of the second power supply relay; the delayed power-off control unit 23 is connected with the first low-voltage power supply unit and the second low-voltage power supply unit, can control the on-off of a first-gear power supply signal, and outputs a low-voltage power supply feedback signal according to the state of the received delayed power-off signal so as to realize the delayed power-off function of the first low-voltage power supply unit and the second low-voltage power supply unit; referring to fig. 2 and 4, the vehicle controller power control unit 24 includes a first vehicle control circuit and a second vehicle control circuit, is connected to the delayed power-off control unit and the vehicle controller, receives the delayed power-off signal and the first-gear power signal, and provides a single-path or double-path power supply for the vehicle controller by using the voltage output by the second low-voltage power supply unit.
Furthermore, a first vehicle control circuit is connected with the second low-voltage power supply unit, the delayed power-off control unit and the vehicle controller, and the circuit is switched on and off according to the on-off state of the first-gear power supply signal, so that the power supply of the vehicle controller supplies power to the vehicle controller; and the second vehicle control circuit is connected with the second low-voltage power supply unit, the delayed power-off control unit and the vehicle controller, and the on-off of the circuit is realized according to the state of the delayed power-off signal, so that the second low-voltage power supply supplies power to the vehicle controller.
The vehicle control unit (not shown) is connected to the delayed power-off control unit 23, and outputs a delayed power-off signal according to the on-off state of the received first-gear power signal when the vehicle is powered on, and outputs a delayed power-off signal state according to the on-off state of the first-gear power signal and the received normal power-off signals of the vehicle components when the vehicle is powered off normally and is powered off abnormally.
First, the first low-voltage power supply unit 21 and the second low-voltage power supply unit 22 will be specifically described. The first low-voltage power supply unit 21 is composed of a 12V first secondary battery power supply, a first power supply control switch a4 connected in series with the first secondary battery power supply, and a second power supply relay K4 connected in series with the first power supply control switch a 4. The on-off state of the first power supply relay K4 is controlled by a low voltage power supply feedback signal, and when the first power supply control switch a4 and the first power supply relay K4 are both turned on, the output port of the unit outputs a first low voltage power supply signal provided by the 12V first battery power supply. The second low-voltage power supply unit 22 is composed of a 24V second secondary battery power supply, a second power supply control switch A3 connected in series with the second secondary battery power supply, and a second power supply relay K3 connected in series with the second power supply control switch A3. The on-off state of the second power supply relay K3 is controlled by the low voltage power supply feedback signal, and when both the second power supply control switch A3 and the second power supply relay K3 are turned on, the output port of the unit outputs the second low voltage power supply signal supplied from the 24V second secondary battery power supply.
Referring to fig. 3 again, the delayed power-off control unit 23 includes a first-gear power switch a2, a first-gear power relay K2 connected to the first-gear power switch, and a delayed power-off relay K1 connected to the first-gear power relay K2, and is connected to the first low-voltage power unit 21, the second low-voltage power unit 22, and the vehicle controller power control unit 24, and the power switches A3 and a4 are closed, so that the function of providing the vehicle with the vehicle low-voltage power can be realized by using the mutual cooperation of the on-off states of the delayed power-off relay K1 and the first-gear power relay K2. Specifically, the delayed power-off control unit 23 receives the delayed power-off signal, controls the on/off of the first-stage power relay K2 or the delayed power-off relay K1 according to the state of the delayed power-off signal, and outputs a low-voltage power feedback control signal, thereby simultaneously controlling the power relay K4 of the first low-voltage power supply unit 21 and the power relay K3 of the second low-voltage power supply unit 22. More specifically, on the one hand, after the power switch A3 is closed, the delayed power-off control unit 23 receives a 24V low-voltage power signal, the first-gear power relay K2 is turned on, the first-gear power switch a2 is closed, the first-gear power signal is output, a low-voltage power feedback control signal is output, and the power relays K4 and K3 are turned on simultaneously; on the other hand, when the delayed power-off signal is received, the delayed power-off relay K1 is in a conducting state, the low-voltage power supply feedback control signal is output, the power relays K4 and K3 are simultaneously conducted, and the first-gear power relay K2 is disconnected.
As shown in fig. 4, the structure of the vehicle control unit power control unit 24 and its operation principle will be described in detail. The vehicle controller power control unit 24 comprises a first path of vehicle control circuit and a second path of vehicle control circuit, specifically, the first path of vehicle control circuit comprises a first path of vehicle control relay K6 and a vehicle controller current limiting device connected with the first path of vehicle control relay K6, the second path of vehicle control circuit comprises a second path of vehicle power supply relay K5, the second vehicle power supply relay is also connected with the vehicle controller current limiting device, wherein the vehicle controller current limiting protection device is formed by connecting a resistor and a light emitting diode in series and then connecting the resistor and a protective tube in parallel, so that the function of preventing the vehicle controller and other components from being damaged by high voltage is realized.
With reference to fig. 3 and fig. 4, it should be noted that, in the present embodiment, the vehicle controller power control unit 24 includes a first vehicle control line and a second vehicle control line, and is connected to the delayed power-off control unit 23 and the vehicle controller. Specifically, a first-gear power signal pin P2 in the delayed power-off control unit 23 is connected with a first-gear signal terminal 8081 in the vehicle control unit power control unit 24; a delay power-off pin P1 in the delay power-off control unit 23 is connected with a delay power-off control terminal 1814 in the vehicle controller power control unit 24; the 24V constant fire pin P5 in the delayed power-off control unit 23 is connected with the 24V low-voltage end in the vehicle control unit power supply control unit 24.
Referring to fig. 4 again, the vehicle controller includes two lines, the first entire vehicle power supply line is controlled by the first entire vehicle power supply relay K6, the relay K6 is connected with the 24V normal fire pin P5 and the first gear power signal pin P2 in the delayed power-off control unit 23, when the first gear power signal is detected, the first entire vehicle power supply relay K6 is turned on, the normally open contact of the relay K6 is closed, the 24V power signal passes through the vehicle controller current limiting device and then is input to the vehicle controller power pin 8101, and the vehicle controller is connected with the power supply; the second power supply line of the whole vehicle is controlled by a second power supply relay K5, the relay K5 is connected with a 24V normal fire pin P5 and a time delay power-off signal pin P1 in the time delay power-off control unit 23, after the time delay power-off signal is output, the first power supply relay K5 of the whole vehicle is conducted, a normally open contact of the relay K5 is closed, and a 24V power supply signal is input to a power supply pin 8101 of the whole vehicle controller after passing through a current limiting device of the whole vehicle controller, so that the function of providing a power supply for the whole vehicle controller is completed.
FIG. 5 shows a delayed power-off control method for a fuel cell new energy bus according to an embodiment of the application. The method comprises the following steps: firstly, in the power-on process, power control switches of a first low-voltage power supply unit and a second low-voltage power supply unit are closed, a normally closed contact of a time delay relay (K1) is closed, a first-gear power supply relay (K2) is electrified, a normally open contact of the first-gear power supply relay is closed, a first-gear power supply switch (A2) is closed, a whole vehicle controller is electrified, power relays (K3 and K4) of the first low-voltage power supply unit and the second low-voltage power supply unit are closed, and a whole vehicle low-voltage power supply is electrified; after the vehicle controller detects a first-gear power supply signal, a delay power-off signal is output, a normally closed contact of a delay relay (K1) is opened, a normally open contact of the delay relay is closed, a normally open contact of a first-gear power supply relay (K2) is opened, and a power supply of the vehicle is electrified.
And then, in the normal power-off process, the vehicle controller disconnects a first-gear power switch (A2) and disconnects a delayed power-off signal when detecting that the first-gear power signal is disconnected and normal power-off signals of various parts of the vehicle are detected, so that the power of the vehicle is powered off.
Finally, in the abnormal power failure process, the vehicle controller detects that the first-gear power supply signal is disconnected and outputs a delayed power failure signal, and the normal operation of each part of the vehicle is ensured through the closing of a normally open contact of a delayed power failure relay (K1); and after the vehicle controller detects the normal power-off signals of all parts of the vehicle, the delayed power-off signals are disconnected, the power supply of the vehicle is disconnected, and the power supply control switches of the first low-voltage power supply unit and the second low-voltage power supply unit are disconnected.
The method for implementing the delayed power-off control function of the fuel cell new energy bus is described in detail below with reference to fig. 3 to 5 according to the principle of the delayed power-off control circuit.
Before the vehicle starts to be powered on, the vehicle is in a power-off static state, the second power switch A3, the first power switch A4 and the first gear power switch A2 are in an off state, normally-open contacts of the relays K1-K6 are disconnected, and a system low-voltage distribution box and the whole vehicle controller are not powered on.
In the vehicle power-on process, referring to fig. 3 and 4, firstly, the second power switch A3 and the first power switch a4 are closed, a 24V constant fire pin outputs a 24V low-voltage power signal, meanwhile, 24V voltage is loaded at two ends of a coil of the first-gear power relay K2, a normally open contact of the first-gear power relay K2 is closed after the first-gear power relay K2 responds for a period of time, and at the moment, the vehicle is in a state of waiting for power on.
Then, the first-gear power switch a2 is closed, as shown in fig. 3, 24V is loaded to both ends of the coils of the power relays K3 and K4, the switches of the power relays K3 and K4 are closed, and the low-voltage distribution box of the vehicle is powered on. After the first-gear switching power supply A2 is closed, the first-gear power signal pin P2 outputs a first-gear power signal, as shown in FIG. 4, a coil of the relay K6 has current passing through until a normally open contact of the relay is closed, so that a first whole vehicle power supply line is conducted, and therefore the function of providing power for a whole vehicle controller is achieved.
Then, after the vehicle controller is powered on, a first-gear power supply signal is detected, an effective delayed power-off signal is output through a delayed power-off pin 1814, a normally open contact of a second path of vehicle power supply relay K5 is closed, and at the moment, a first path of vehicle power supply line and a second path of vehicle power supply line are both conducted, so that a two-path power supply function for the vehicle controller is realized. Wherein the delayed power down signal low level output is active. Referring to fig. 3, when a valid delayed power-off signal is input to the delayed power-off pin P1, the delayed power-off relay K1 is turned on, so that the relays K3 and K4 are turned on, and meanwhile, the coil device of the first-gear power relay K2 gradually discharges until the normally open contact thereof is turned off, thereby completing the process of turning on the power supply of the entire vehicle.
Finally, the process of the vehicle power off delay will be explained. The power-off process of the vehicle is divided into two situations, one is a normal power-off process of the vehicle, and the other is an abnormal power-off process of the vehicle. It should be noted that no matter which kind of outage situation the vehicle belongs to, the vehicle control unit needs to detect the on-off situation of the first-gear power signal first to turn off the first-path vehicle power supply line first, then, judge whether to continue to output the delayed outage signal, and then ensure the on-off state of the second-path vehicle power supply line, thereby realize the outage function under different circumstances of vehicle delay.
The following first describes the normal power-down process of the vehicle in detail. Firstly, after a secondary power switch is turned off, the vehicle control unit detects that a secondary power signal is turned off, communicates with each component of the vehicle through a CAN network to confirm that the power is about to be cut off, and turns off a high-voltage power supply after each component responds. Then, referring to fig. 4, the first-gear power signal is turned off, the first-path finished vehicle power supply relay K6 is turned off, the first-path finished vehicle power supply line is turned off, the finished vehicle controller detects that the first-gear power signal is turned off, the delayed power-off signal continuously outputs a low-level signal, at this time, the normally-open contact of the second-path finished vehicle power supply relay K5 is in a closed state, so that the second-path finished vehicle power supply line is turned on, and meanwhile, as shown in fig. 3, the turn-on of the delayed power-off relay K1 ensures the turn-on state of the power relays K3 and K4, the continuous power supply of the finished vehicle controller and the system low-voltage distribution box is ensured, and the power supply condition of each component of the vehicle is normal. And then, the vehicle controller communicates with each component of the vehicle through the CAN network, when the condition that each component accords with the power-off state is confirmed, the output of a delayed power-off signal is cancelled, the delayed power-off relay K1 and the second vehicle power supply relay K5 are disconnected after discharging to a normally open contact thereof, the power relays K3 and K4 are disconnected, and the power supply of the vehicle controller and the system low-voltage distribution box is disconnected, so that the normal power-off process of the vehicle is completed.
Generally, during the running of the vehicle, there is an abnormal power failure condition caused by the fact that a driver or other people do not operate according to the normal power on and off sequence of the whole vehicle. When abnormal power failure occurs, if the vehicle is to continue to run safely, all parts of the vehicle need to be ensured to be supplied with power continuously. Specifically, vehicle control unit passes through CAN network and each part communication, if not receive when the affirmation signal of each part normal outage of vehicle, refer to fig. 3, fig. 4, no matter CAN detect one grade of power signal and/or two grades of power signal, the time delay outage signal still continues to be output to guaranteed relay K1, K3, K4, K5's the state that continues to switch on, and then ensured the normal power supply of system low pressure block terminal and vehicle control unit, make vehicle high-low voltage part work normally, ensured the safety of traveling of vehicle.
It should be noted that the invention makes full use of the way of controlling the output time sequence of the delayed power-off signal to make the power supply of the whole vehicle controller in a continuous on state, thereby realizing the control method of the delayed power-off of the fuel cell passenger vehicle with the double-battery voltage platform. For example, in one embodiment, when the entire vehicle is powered off normally (the driver turns off the second gear controller first and then turns off the first gear controller), the vehicle can complete all high-low voltage power-off operations in a short time, but the fuel cell stack system needs to be shut down for up to 30s from normal operation to complete shutdown, if the fuel cell stack system is powered off suddenly when the system is not turned off completely, the service life of the stack system can be shortened or even damaged.
The time-delay power-off control circuit of the embodiment of the invention controls the normally open and normally closed interfaces of the relays according to the relevant logic strategy on one hand, and on the other hand, realizes the continuous power supply of the vehicle low-voltage distribution box and the vehicle controller and the function of continuously supplying power to the vehicle controller under the condition of abnormal power-off of the vehicle by the way of communicating the CAN network of the vehicle controller with the high-voltage components such as the fuel cell system and the like to acquire relevant information, thereby ensuring the service life and normal operation of the vehicle components, ensuring the high-low voltage power supply stability of the fuel cell vehicle with the double-storage-battery voltage platform and ensuring the driving safety of the vehicle when the vehicle is abnormally powered off.
Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A time delay outage control circuit for a fuel cell new energy bus, the time delay outage control circuit comprising:
the low-voltage power supply control system comprises a first low-voltage power supply unit and a second low-voltage power supply unit which are connected with each other, wherein each group of low-voltage power supply units respectively comprise a storage battery power supply, a power supply control switch connected with the storage battery power supply and a power supply relay connected with the power supply control switch, each power supply relay respectively receives a low-voltage power supply feedback control signal, is combined with the corresponding group of power supply control switches, outputs a first low-voltage power supply and a second low-voltage power supply with different numerical values and provides a whole vehicle low-voltage power supply for a vehicle, and the low-voltage power supply feedback control signals control the on-off state of the power supply relays;
the delayed power-off control unit is connected with the first low-voltage power supply unit and the second low-voltage power supply unit, controls the on-off of a first-gear power supply signal, and outputs a low-voltage power supply feedback control signal according to the state of the received delayed power-off signal so as to realize the delayed power-off of the first low-voltage power supply unit and the second low-voltage power supply unit;
the whole vehicle controller is connected with the delayed power-off control unit, outputs the delayed power-off signal according to the on-off state of the received first-gear power signal when the vehicle is powered on, and outputs the delayed power-off signal state according to the on-off state of the first-gear power signal and the received normal power-off signals of all components of the vehicle when the vehicle is powered off normally and is powered off abnormally;
and the power control unit of the whole vehicle controller comprises a first whole vehicle control circuit and a second whole vehicle control circuit, is connected with the delayed power-off control unit and the whole vehicle controller, receives the first-gear power signal, outputs the delayed power-off signal, and provides a single-path or double-path power supply for the whole vehicle controller by using the voltage output by the second low-voltage power supply unit.
2. The control circuit of claim 1, wherein the vehicle control unit power control unit comprises:
and the first vehicle control circuit is connected with the second low-voltage power supply unit, the delayed power-off control unit and the vehicle controller, and the on-off of the circuit is realized according to the on-off state of the first-gear power supply signal, so that the power of the vehicle controller supplies power to the vehicle controller.
3. The control circuit of claim 2, wherein the vehicle control unit power control unit further comprises:
and the second vehicle control circuit is connected with the second low-voltage power supply unit, the delayed power-off control unit and the vehicle controller, and the on-off of the circuit is realized according to the state of the delayed power-off signal, so that the second low-voltage power supply supplies power to the vehicle controller.
4. The control circuit according to any one of claims 1 to 3,
the whole vehicle power supply of the fuel cell new energy passenger vehicle comprises a whole vehicle low-voltage power supply and a whole vehicle high-voltage power supply, and the providing of the whole vehicle low-voltage power supply needs to simultaneously complete the output of the signal of the first low-voltage power supply, the signal of the second low-voltage power supply and the signal of the whole vehicle controller power supply;
and the vehicle control unit controls the vehicle high-voltage power supply.
5. The control circuit according to any one of claims 1 to 3,
the first vehicle control circuit comprises a first vehicle control relay and a vehicle controller current limiting device connected with the first vehicle control relay; the second vehicle control circuit comprises a second vehicle power supply relay, and the second vehicle power supply relay is connected with the vehicle controller current limiting device.
6. The control circuit according to any one of claims 1 to 3,
the delay power-off control unit comprises a first-gear power switch, a first-gear power relay connected with the first-gear power switch and a delay power-off relay connected with the first-gear power relay.
7. The control circuit of claim 6,
the delayed power-off control unit can also receive a delayed power-off signal, control the on-off of the first-gear power relay or the delayed power-off relay according to the state of the delayed power-off signal, and output the low-voltage power supply feedback control signal.
8. A delayed power-off control method for a fuel cell new energy passenger car, wherein the new energy passenger car is provided with a double-storage-battery voltage platform and the delayed power-off control circuit as claimed in any one of claims 1-7, and the method comprises the following steps:
in the power-on process:
the power control switches of the first low-voltage power supply unit and the second low-voltage power supply unit are closed, the normally closed contact of a time-delay power-off relay (K1) is closed, a first-gear power supply relay (K2) is electrified, the normally open contact of the first-gear power supply relay is closed, a first-gear power supply switch (A2) is closed, the whole vehicle controller is electrified, the power supply relays (K3, K4) of the first low-voltage power supply unit and the second low-voltage power supply are closed, and the whole vehicle low-voltage power supply is electrified;
the vehicle control unit outputs the delayed power-off signal after detecting a first-gear power signal, the normally closed contact of the delayed power-off relay (K1) is opened, the normally open contact is closed, the normally open contact of the first-gear power relay (K2) is opened, and the power supply of the vehicle is electrified.
9. The control method according to claim 8, characterized in that the method further comprises the steps of:
during normal power down:
and a first-gear power switch (A2) is turned off, the vehicle controller turns off the delayed power-off signal when detecting that the first-gear power signal is turned off and normal power-off signals of all parts of the vehicle are detected, and the power of the vehicle is powered off.
10. A control method according to claim 8 or 9, characterized in that the method further comprises the steps of:
in the abnormal power-off process:
the vehicle controller detects that the first-gear power supply signal is disconnected and outputs the delayed power-off signal, and normal operation of each part of the vehicle is ensured through closing of a normally open contact of the delayed power-off relay (K1);
and after the vehicle controller detects normal power-off signals of all parts of the vehicle, the vehicle controller disconnects the delayed power-off signals, disconnects the vehicle power supply and disconnects the power control switches of the first low-voltage power supply unit and the second low-voltage power supply unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710408220.1A CN108973685B (en) | 2017-06-02 | 2017-06-02 | Delayed power-off control circuit and method for fuel cell new energy bus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710408220.1A CN108973685B (en) | 2017-06-02 | 2017-06-02 | Delayed power-off control circuit and method for fuel cell new energy bus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108973685A CN108973685A (en) | 2018-12-11 |
| CN108973685B true CN108973685B (en) | 2021-08-31 |
Family
ID=64502560
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710408220.1A Active CN108973685B (en) | 2017-06-02 | 2017-06-02 | Delayed power-off control circuit and method for fuel cell new energy bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108973685B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109955811A (en) * | 2019-04-25 | 2019-07-02 | 安徽卓越电气有限公司 | A kind of defense controls circuit of pair of Vehicular accumulator cell |
| CN110356237B (en) * | 2019-06-27 | 2021-12-17 | 厦门金龙汽车新能源科技有限公司 | Electric vehicle and high-voltage power-off control method and device thereof |
| CN112519580B (en) * | 2019-09-17 | 2022-10-21 | 顺丰科技有限公司 | Vehicle control system and control method |
| CN111016662B (en) * | 2019-12-27 | 2021-10-26 | 中通客车控股股份有限公司 | Fuel cell passenger car power-off control method and system |
| CN111717146B (en) * | 2020-06-04 | 2023-03-28 | 奇瑞商用车（安徽）有限公司 | Power supply control circuit and method for electric automobile without low-voltage storage battery |
| CN112104037B (en) * | 2020-09-15 | 2022-11-29 | 阿波罗智联(北京)科技有限公司 | Power supply system, control method thereof, automatic driving vehicle and power supply management device |
| CN112078434B (en) * | 2020-09-29 | 2024-05-24 | 武汉海亿新能源科技有限公司 | Power-on and power-off control method and device for hydrogen fuel cell vehicle |
| CN114475249A (en) * | 2020-10-28 | 2022-05-13 | 湖南中车智行科技有限公司 | High-low voltage power-off time sequence control method, device and system of new energy vehicle |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192072A (en) * | 1996-09-11 | 1998-09-02 | 郑炳天 | System for preventing vehicle battery from being excessively discharged |
| CN103587484A (en) * | 2013-11-29 | 2014-02-19 | 重庆长安汽车股份有限公司 | Electric vehicle charging connection device |
| CN205220389U (en) * | 2015-11-20 | 2016-05-11 | 石家庄市均益电子有限公司 | Electric automobile electric leakage emergent power -off device |
| CN205736978U (en) * | 2016-06-12 | 2016-11-30 | 江苏卡威汽车研究院有限公司 | Electric installation under a kind of car load time delay |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8941264B2 (en) * | 2011-06-20 | 2015-01-27 | Bae Systems Information And Electronic Systems Integration Inc. | Apparatus for bi-directional power switching in low voltage vehicle power distribution systems |
-
2017
- 2017-06-02 CN CN201710408220.1A patent/CN108973685B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1192072A (en) * | 1996-09-11 | 1998-09-02 | 郑炳天 | System for preventing vehicle battery from being excessively discharged |
| CN103587484A (en) * | 2013-11-29 | 2014-02-19 | 重庆长安汽车股份有限公司 | Electric vehicle charging connection device |
| CN205220389U (en) * | 2015-11-20 | 2016-05-11 | 石家庄市均益电子有限公司 | Electric automobile electric leakage emergent power -off device |
| CN205736978U (en) * | 2016-06-12 | 2016-11-30 | 江苏卡威汽车研究院有限公司 | Electric installation under a kind of car load time delay |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108973685A (en) | 2018-12-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108973685B (en) | Delayed power-off control circuit and method for fuel cell new energy bus | |
| CN105128678A (en) | High-voltage power-on and power-off control system and control method for pure electric vehicle | |
| CN103847531A (en) | Electric car high-voltage electrical system and control method thereof | |
| CN111114325B (en) | Power-on control protection system of fuel cell passenger car | |
| CN108583286A (en) | A kind of pure electric coach high pressure power-on and power-off strategy | |
| CN109941109B (en) | Switch and safety system for controlling power-on and power-off sequence of high-voltage electric device of electric automobile | |
| CN111532135B (en) | Electricelectric moves power-on and power-off control system of heavily blocking | |
| CN113799610B (en) | Vehicle redundancy control method and device and vehicle | |
| CN102278250A (en) | Double-accumulator battery managing system | |
| CN207902187U (en) | A kind of electric vehicle low pressure self saving control circuit | |
| CN110920392B (en) | Power supply control circuit, power supply control method and new energy automobile | |
| CN112311261B (en) | Duplex starting control circuit of auxiliary inverter of railway vehicle | |
| CN111216556A (en) | Low-voltage power storage unit charging control method and system and unmanned vehicle | |
| CN109808547B (en) | Low-power-consumption power storage battery ignition power-on control circuit and control method | |
| CN113022313B (en) | VCU power-off protection circuit, power-off control method, system and engineering machinery | |
| CN104175911A (en) | BHB (high voltage bus high speed breaker) network control method | |
| CN113665362B (en) | Control method of power-on and power-off control system of pure electric vehicle | |
| CN110450626A (en) | Fuel feed exception emergency system, method and vehicle | |
| CN113306404B (en) | Rail vehicle ground power supply interlocking device and rail vehicle ground power supply access method | |
| CN112072630B (en) | Control device and method for automobile high-voltage power distribution system and automobile | |
| CN114290906A (en) | High-voltage control device, control method and aircraft | |
| CN112133599A (en) | Electromagnetic type power master switch control circuit | |
| CN114454723A (en) | Control system and method of pantograph and locomotive | |
| CN103887873A (en) | Power supply standby device for transformer substation achieved based on PLC | |
| CN113752842A (en) | New energy special vehicle loading and chassis interaction control strategy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |