CN207020258U - Automobile electrothermic plug fault diagnosis system - Google Patents
Automobile electrothermic plug fault diagnosis system Download PDFInfo
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- CN207020258U CN207020258U CN201720651951.4U CN201720651951U CN207020258U CN 207020258 U CN207020258 U CN 207020258U CN 201720651951 U CN201720651951 U CN 201720651951U CN 207020258 U CN207020258 U CN 207020258U
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- China
- Prior art keywords
- glow plug
- ecu
- battery
- relay
- plug
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Abstract
It the utility model is related to a kind of automobile electrothermic plug fault diagnosis system, including battery, ECU, relay and glow plug, the ECU includes voltage collection circuit, microprocessor and the switch driving circuit being sequentially connected, the battery positive voltage connection ECU and relay, negative pole ground connection；ECU positive source input connects battery positive voltage, and power cathode input end grounding, the contact of relay 87 is connected with glow plug positive pole；Glow plug negative pole is grounded.Beneficial effect：The utility model can accurately find glow plug failure, remind car owner to change in time, ensure vehicle cold-start performance or ensure burner normal work.
Description
Technical field
The utility model belongs to car combustion engine fault detect, more particularly to a kind of automobile electrothermic plug fault diagnosis system.
Background technology
Glow plug is electric component common in automobile, is mainly used in engine charge preheating and fuel Heating etc., so as to
Improve the cold starting performance of engine.Meanwhile it is increasingly strict with automobile emissions standards, the emission control systems of diesel vehicle are more
For complexity, part diesel vehicle is used for the regeneration of grain catcher using burner, important component of the glow plug as burner, its
Failure be cause burner can not normal ignition the main reason for one of.Therefore, the fault diagnosis of glow plug is started for lifting
Machine cold starting performance and guarantee emission control systems normal work have great importance.
After glow plug breaks down, it will usually cause resistance to increase, electric current declines, so that heating power reduces,
Original function can not be realized.Existing diagnostic method is generally electric current testing and resistance detection method.Electric current testing detects
Electric current when glow plug works in loop, typically carries out indirect control, its electric current does not pass through yet with glow plug by relay
ECU, can not directly it detect；And detected using series resistor mode, it is necessary to high accuracy, the resistance of low resistance are used,
Cost is higher, and circuit is increasingly complex.Resistance detection method is to detect the resistance of glow plug, it is necessary to additionally provide electricity to glow plug
Source, circuit are complicated.
Patent document 101619699 discloses a kind of glow plug control system for vehicle, includes mode control module
And fault diagnosis module.The mode control module can enable according to glow plug during driving cycle in the period opened
One of the first mode of operation and second mode.When enabling the first mode, the fault diagnosis module can be according to the first letter
Breath, the second information and the 3rd header length ground tracing trouble, when enabling the second mode, the fault diagnosis module can not
Tracing trouble dependent on the second information and the 3rd header length.Employed in the patent and be functionally separated from engine control
Module ECM glow plug control module carries out glow plug control and diagnosis, and communication transmitting data is carried out between module, and system is formed
It is complex.When signal of communication lacks, glow plug control function will be influenceed.Different diagnostic modes needs to rely on engine turn
Signal, the diagnostic logics such as speed, air-mass flow and intake air temperature are complex.
Utility model content
The purpose of this utility model is to overcome the shortcomings of above-mentioned technology, and provides a kind of automobile electrothermic plug fault diagnosis system
System, it is accurate to find glow plug failure, remind car owner to change in time, ensure vehicle cold-start performance or ensure the normal work of burner
Make.
The utility model to achieve the above object, using following technical scheme：A kind of automobile electrothermic plug fault diagnosis system,
It is characterized in that：Including battery, ECU, relay and glow plug.
The ECU leads to engine electric-controlled unit or emission control systems ECU or uses the automatically controlled list of glow plug
Member.
The ECU includes voltage collection circuit, microprocessor and the switch driving circuit being sequentially connected, the electricity
Pressure Acquisition Circuit is used to gather battery both end voltage, and the voltage signal after processing is supplied into microprocessor, micro- place
Device is managed by controlling the switch driving circuit, is switched on or switched off relay, so as to control being switched on or switched off for glow plug circuit.
The battery is car battery, can be worked for system and provide electric energy；The battery is simultaneously equivalent to biography
Sensor, ECU continues to monitor the voltage signal at battery both ends in system work process.
The battery positive voltage connection ECU and relay, negative pole ground connection；ECU positive source input connects
Connect battery positive voltage, power cathode input end grounding, switch drive end connection relay 86 contact of ECU；Relay 30
Contact and 85 contacts are connected with battery positive voltage respectively, and the contact of relay 87 is connected with glow plug positive pole；Glow plug negative pole is grounded.
Beneficial effect：Compared with prior art, the utility model can accurately find glow plug failure, remind car owner in time
Change, ensure vehicle cold-start performance or ensure burner normal work.The work(of battery in diagnostic system of the present utility model
It can be not only power supply, while also correspond to sensor element, the voltage signal at battery both ends is whether diagnosis glow plug is former
The main signal of barrier；Compared to other diagnostic methods, the utility model circuit is simple, without increasing additional circuit on vehicle；
Cost is cheap, without increasing additional hardware cost.To solve, the circuit in existing diagnostic techniques is complicated, costly problem.
Brief description of the drawings
Fig. 1 is Tthe utility model system structure principle chart；
Fig. 2 is Tthe utility model system connection figure；
Fig. 3 is Tthe utility model system workflow diagram；
Fig. 4 is the utility model diagnosis exemplary plot.
In figure：1st, battery, 2, ECU, 3, relay, 4, glow plug.
Embodiment
Specific embodiment of the present utility model is described in detail with reference to preferred embodiment.
Accompanying drawing 1,2 is referred to, present embodiments provides a kind of automobile electrothermic plug fault diagnosis system, including it is battery 1, automatically controlled
Unit 2, relay 3 and glow plug 4, the ECU include voltage collection circuit, microprocessor and the switch being sequentially connected
Drive circuit, ECU are used to control glow plug work, collection battery tension and glow plug failure are diagnosed；It is described
Battery positive voltage connects ECU and relay, negative pole ground connection；ECU positive source input connects battery positive voltage,
Power cathode input end grounding, switch drive end connection relay 86 contact of ECU；The contact of relay 30 and 85 contacts
It is connected respectively with battery positive voltage, the contact of relay 87 is connected with glow plug positive pole；Glow plug negative pole is grounded.The battery is
Vehicle-mounted starting type battery, it can be worked for system and electric energy is provided；The battery is simultaneously worked equivalent to sensor, system
ECU continues to monitor the voltage signal at battery both ends in journey；The ECU is electronic control unit of automobile engine, tool
There are glow plug control and diagnostic function, for controlling glow plug work, collection battery tension and glow plug failure being examined
It is disconnected, while ECU can also gather automobile ignition switch, engine condition and automobilism ambient parameter；The relay
For relay for automobile, for controlling glow plug to work, the excessive damage switchgear of glow plug operating current is avoided；The glow plug
For automotive air induction duct heater plug, for heating air inlet, cold-starting automobile performance is improved.
As shown in figure 3, using the detection method of automobile electrothermic plug fault diagnosis system, pass through ECU measuring relay
The voltage at battery both ends before and after connection, and calculate the amplitude that battery tension changes before and after relay is connected；Again by battery
Voltage change amplitude compares with the threshold value set, to diagnose the failure of glow plug.
Fig. 4 is the diagnosis process of the glow plug to two different conditions in the present embodiment, respectively by 1 intact glow plug
It is attached according to shown in Fig. 2 with the glow plug of 1 damage, and is diagnosed according to step shown in Fig. 3, during record diagnosis
Voltage change.
It is as follows to intact glow plug diagnosis algorithm and process：
(1) system electrification, kept off when automobile ignition switch is converted to ON from OFF gears, now system electrification；
(2) condition judgment：Decision logic is battery tension to be detected, when battery tension is less than 12V, then it is assumed that is stored
Battery electric quantity deficiency or load are larger, without diagnosis；When battery tension is higher than 13.5V, then it is assumed that generator is in work
Make state, without diagnosis；When the large power-consuming equipments such as starter work, without diagnosis；When in the absence of above-mentioned limitation
During condition, then diagnosed；It is 12.6V that measurement, which obtains battery tension, in the present embodiment, and without high-power use such as starters
Electric equipment connects signal, therefore judges to be diagnosed；
(3) start to diagnose：The battery tension in 0.2s is recorded, and carries out average value processing, obtained battery tension is
12.6V；Glow plug is connected, the battery tension after record glow plug is opened in 0.2s, carries out average value processing, obtained battery
Voltage is 11.1V；Close glow plug；
(4) mathematic interpolation：Battery tension average before and after opening glow plug is compared, calculating difference, difference is
1.5V；
(5) threshold value：The determination principle of threshold value is, according to battery tension, environment temperature parameter, threshold value；When
When battery initial voltage is higher, storage battery practical capacity is larger, and accumulator internal resistance is smaller, glow plug connect after voltage difference compared with
Small, threshold value should accordingly reduce, otherwise voltage threshold should increase；When environment temperature is relatively low, accumulator internal resistance is larger, and threshold value should be corresponding
Increase, on the contrary threshold value should reduce；By Experimental Calibration, it is determined that in battery tension 12.6V, when environment temperature is 25 DEG C, threshold value
For 1.1V.
(6) diagnositc decision：Decision principle is, by storage battery pressure difference compared with threshold value, when difference is more than threshold value,
Then it is determined as intact；When difference is less than threshold value, then it is determined as failure；Because difference is 1.5V, threshold value 1.1V, difference is more than threshold
Value, therefore it is intact to be diagnosed as glow plug.
(7) troubleshooting：Processing method is, when glow plug is intact, without processing；When glow plug failure, it is necessary to hair
Motivation inline diagnosis (OBD) system reporting fault；Therefore without further handling in the embodiment；
(8) diagnosis terminates：After completing above-mentioned steps, diagnosis terminates.
It is as follows to the glow plug diagnosis algorithm and process of failure：
(1) system electrification, when automobile ignition switch is converted to ON shelves from OFF shelves, now system electrification；
(2) condition judgment：Decision logic is battery tension to be detected, when battery tension is less than 12V, then it is assumed that is stored
Battery electric quantity deficiency or load are larger, without diagnosis；When battery tension is higher than 13.5V, then it is assumed that generator is in work
Make state, without diagnosis；When the large power-consuming equipments such as starter work, without diagnosis；When in the absence of above-mentioned limitation
During condition, then diagnosed；It is 12.6V that measurement, which obtains battery tension, in the present embodiment, and without high-power use such as starters
Electric equipment connects signal, therefore judges to be diagnosed；
(3) start to diagnose：The battery tension in 0.2s is recorded, and carries out average value processing, obtained battery tension is
12.6V；Glow plug is connected, the battery tension after record glow plug is opened in 0.2s, carries out average value processing, obtained battery
Voltage is 12.1V；Close glow plug；
(4) mathematic interpolation：Battery tension average before and after opening glow plug is compared, calculating difference, difference is
0.5V；
(5) threshold value：The determination principle of threshold value is, according to battery tension, environment temperature parameter, threshold value；When
When battery initial voltage is higher, storage battery practical capacity is larger, and accumulator internal resistance is smaller, glow plug connect after voltage difference compared with
Small, threshold value should accordingly reduce, otherwise voltage threshold should increase；When environment temperature is relatively low, accumulator internal resistance is larger, and threshold value should be corresponding
Increase, on the contrary threshold value should reduce；By Experimental Calibration, it is determined that in battery tension 12.6V, when environment temperature is 25 DEG C, threshold value
For 1.1V.
(6) diagnositc decision：Decision principle is, by storage battery pressure difference compared with threshold value, when difference is more than threshold value,
Then it is determined as intact；When difference is less than threshold value, then it is determined as failure；Because difference is 0.5V, threshold value 1.1V, difference is less than threshold
Value, therefore it is diagnosed as glow plug failure.
(7) troubleshooting：Processing method is, when glow plug is intact, without processing；When glow plug failure, it is necessary to hair
Motivation inline diagnosis (OBD) system reporting fault；Therefore failure is produced to OBD system reporting fault, OBD system in the embodiment
Code, and trouble light is lighted, remind driver to be repaired；
(8) diagnosis terminates：After completing above-mentioned steps, diagnosis terminates.
In the above-described embodiments, the diagnosis duration of single glow plug is about 0.5s.
System Working Principle is, when glow plug normal work, larger current is produced in circuit, and battery is with interior
Resistance, voltage drop is produced in internal storage battery, so as to reduce battery output voltage.When glow plug fails, operating current reduces,
Caused by voltage drop reduce, therefore battery tension change amplitude it is smaller.
In system work process, amplitude and accumulator internal resistance, generator and other electrical equipments that battery tension reduces
Whether work relevant, therefore it is determined that during voltage drop Low threshold, should be modified according to above-mentioned parameter, or be in above-mentioned parameter
Diagnosed when under certain condition, to ensure diagnostic accuracy.
The above-mentioned detailed description carried out with reference to embodiment to a kind of automobile electrothermic plug fault diagnosis system, is illustrative
Rather than it is limited, several embodiments can be included according to limited scope, therefore do not departing from the utility model totality
Changing and modifications under design, should belong within the scope of protection of the utility model.
Claims (3)
1. a kind of automobile electrothermic plug fault diagnosis system, it is characterized in that：Including battery, ECU, relay and glow plug,
The ECU includes voltage collection circuit, microprocessor and the switch driving circuit being sequentially connected, and ECU is used to control
Glow plug processed works, gathers battery tension and glow plug failure is diagnosed；The battery positive voltage connects ECU
And relay, negative pole ground connection；ECU positive source input connects battery positive voltage, power cathode input end grounding, electricity
Control switch drive end connection relay 86 contact of unit；The contact of relay 30 and 85 contacts are connected with battery positive voltage respectively,
The contact of relay 87 is connected with glow plug positive pole；Glow plug negative pole is grounded.
2. automobile electrothermic plug fault diagnosis system according to claim 1, it is characterized in that：The ECU, which uses, to be started
Electrical Control unit or emission control systems ECU or glow plug control unit.
3. automobile electrothermic plug fault diagnosis system according to claim 1, it is characterized in that：The battery is automobile-used electric power storage
Pond, it can be worked for system and electric energy is provided；The battery is simultaneously equivalent to sensor, and ECU is held in system work process
The voltage signal at continuous monitoring battery both ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720651951.4U CN207020258U (en) | 2017-06-07 | 2017-06-07 | Automobile electrothermic plug fault diagnosis system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720651951.4U CN207020258U (en) | 2017-06-07 | 2017-06-07 | Automobile electrothermic plug fault diagnosis system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207020258U true CN207020258U (en) | 2018-02-16 |
Family
ID=61484782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720651951.4U Expired - Fee Related CN207020258U (en) | 2017-06-07 | 2017-06-07 | Automobile electrothermic plug fault diagnosis system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207020258U (en) |
-
2017
- 2017-06-07 CN CN201720651951.4U patent/CN207020258U/en not_active Expired - Fee Related
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180216 Termination date: 20200607 |
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| CF01 | Termination of patent right due to non-payment of annual fee |