CN102721894A - Fuel metering valve drive diagnostic system - Google Patents
Fuel metering valve drive diagnostic system Download PDFInfo
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- CN102721894A CN102721894A CN2011100793512A CN201110079351A CN102721894A CN 102721894 A CN102721894 A CN 102721894A CN 2011100793512 A CN2011100793512 A CN 2011100793512A CN 201110079351 A CN201110079351 A CN 201110079351A CN 102721894 A CN102721894 A CN 102721894A
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- metering valve
- fuel metering
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Abstract
The invention discloses a fuel metering valve drive diagnostic system which comprises a microprocessor, a high side driver circuit, a low side driver circuit, a high side current sampling circuit, a low side current sampling circuit, and a low side voltage sampling circuit. A fuel metering valve is connected to a power supply through the high side driver circuit and is in grounding through the low side driver circuit. The microprocessor outputs a high side driver control signal to control the open and close of the high side driver circuit and outputs a low side driver control signal to control the open and close of the low side driver circuit. A fuel metering valve drive diagnostic result is outputted according to current sampling from the fuel metering valve to the high side driver circuit, current sampling from the fuel metering valve to the low side driver circuit, and voltage sampling of the fuel metering valve and the low side driver circuit. According to the fuel metering valve drive diagnostic system, diagnosing six kinds of failure modes of fuel metering valve drive can be realized.
Description
Technical field
The present invention relates to the engine electric control fuel oil spraying technology, particularly a kind of fuel metering valve drives diagnostic system.
Background technology
The fuel metering valve drive system is as shown in Figure 1; Comprise microprocessor (MCU), flash driving circuit, low limit driving circuit; Fuel metering valve is through flash driving circuit BOR Bunker of Redelivery metering valve driving power; Through low limit driving circuit ground connection, opening and closing of the low limit drive control signal low limit driving circuit of control exported in opening and closing of microprocessor output flash drive control signal control flash driving circuit.Be defined as the A end if fuel metering valve is connect flash driving circuit end, connect low limit driving circuit end and be defined as the B end.Fuel metering valve drives has six kinds of fault modes:
(1) the A end is to power supply short circuit; (2) A end shorted to earth; (3) the B end is to power supply short circuit; (4) B end shorted to earth; (5) A end and B terminal shortcircuit; (6) the A end opens circuit with the B end.
The prior fuel oil metering valve drives in the diagnostic system, only can hold shorted to earth, B end that power supply short circuit, three kinds of fault modes of B end shorted to earth are diagnosed to A usually.
Summary of the invention
The technical matters that the present invention will solve provides a kind of fuel metering valve and drives diagnostic system, can realize that fuel metering valve is driven six kinds of fault modes to be diagnosed.
For solving the problems of the technologies described above; Fuel metering valve of the present invention drives diagnostic system, comprises microprocessor, flash driving circuit, low limit driving circuit, and fuel metering valve is through flash driving circuit BOR Bunker of Redelivery metering valve driving power; Through low limit driving circuit ground connection; Fuel metering valve is connect flash driving circuit end be defined as the A end, connect low limit driving circuit end and be defined as the B end, also comprise flash current sampling circuit, low limit current sampling circuit, low polygonal voltage sample circuit;
Said flash current sampling circuit is used for holding the electric current of flash driving circuit to sample to A;
Said low limit current sampling circuit is used for holding the electric current of low limit driving circuit to sample to B;
Said low polygonal voltage sample circuit is used for the voltage of B end is sampled;
Said microprocessor; Output flash drive control signal is controlled opening and closing of flash driving circuit; Opening and closing of limit driving circuit hanged down in the drive control signal control of the low limit of output, and holds current sample, B in the flash driving circuit to hold the current sample in the driving circuit of low limit, the voltage sample output fuel metering valve of B end to drive diagnostic result according to A.
Said microprocessor work process is following:
One. microprocessor output flash drive control signal control flash driving circuit cuts out, and the low limit of drive control signal control, the low limit of output driving circuit cuts out, and makes fuel metering valve be in off working state;
Two. under fuel metering valve is in off working state, if the voltage of B end is more than or equal to setting low pressure and smaller or equal to setting high pressure, then carrying out step 3; If the voltage of B end then carries out step 5 less than setting low pressure; If the voltage of B end then carries out step 7 greater than setting high pressure;
Three. microprocessor output flash drive control signal control flash driving circuit is opened, and the low limit of drive control signal control, the low limit of output driving circuit is opened, and makes fuel metering valve get into duty;
Four. after fuel metering valve gets into duty,
If A holds electric current or the B in the flash driving circuit to hold the electric current in the driving circuit of low limit to be higher than the high electric current of setting, then microprocessor output side a and b short circuit diagnostic message gets into step 9 then;
If A holds electric current or the B in the flash driving circuit to hold the electric current in the driving circuit of low limit to be lower than the setting low current, then microprocessor output side a and b open circuit diagnostic message gets into step 9 then;
Five. microprocessor output flash drive control signal control flash driving circuit is opened;
Six. after the flash driving circuit is opened,
If A holds electric current in the flash driving circuit more than or equal to setting high electric current, then microprocessor output A end shorted to earth diagnostic message gets into step 9 then;
Otherwise microprocessor output B end shorted to earth diagnostic message gets into step 9 then;
Seven. the low limit of drive control signal control, the low limit of microprocessor output driving circuit is opened;
Eight. after low limit driving circuit is opened,
If B holds the electric current that hangs down in the driving circuit of limit more than or equal to setting high electric current, then microprocessor output B end gets into step 9 then to the power supply short circuit diagnostic message;
Otherwise microprocessor output A end gets into step 9 then to the power supply short circuit diagnostic message;
Nine. diagnosis finishes.
In the step 4; After fuel metering valve gets into duty; If A holds electric current or the B in the flash driving circuit to hold the electric current that hangs down in the driving circuit of limit more than or equal to the setting low current and smaller or equal to setting high electric current; Then the normal connection diagnostic information of microprocessor output side a and b gets into step 9 then.
Said fuel metering valve driving power voltage can be 12V, and said setting low pressure can be 0.5V, and said setting high pressure can be 4.5V, and said setting low current can be 0.2A, and the high electric current of said setting can be 10A.
Fuel metering valve of the present invention drives diagnostic system; Combine drive control signal comprehensively to judge fuel metering valve again according to feedback signal and drive concrete fault; Can detect and judge A end shorted to earth, the B end to power supply short circuit, B end shorted to earth, A end and B terminal shortcircuit, six kinds of faults of A end and B end open circuit, realizes that above fuel metering valve is driven six kinds of fault modes to be diagnosed to power supply short circuit, A end.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is done further explain.
Fig. 1 is a fuel metering valve drive system synoptic diagram;
Fig. 2 is that fuel metering valve of the present invention drives diagnostic system one embodiment synoptic diagram;
Fig. 3 is that fuel metering valve of the present invention drives diagnostic system one embodiment microprocessor work process synoptic diagram.
Embodiment
It is as shown in Figure 2 that fuel metering valve of the present invention drives diagnostic system one embodiment, comprises microprocessor (MCU), flash driving circuit, low limit driving circuit, flash current sampling circuit, low limit current sampling circuit, low polygonal voltage sample circuit; Fuel metering valve is through flash driving circuit BOR Bunker of Redelivery metering valve driving power, through low limit driving circuit ground connection; Fuel metering valve is connect flash driving circuit end be defined as the A end, connect low limit driving circuit end and be defined as the B end;
Said flash current sampling circuit is used for holding the electric current of flash driving circuit to sample to A, and output flash current feedback signal is to microprocessor;
Said low limit current sampling circuit is used for holding the electric current of low limit driving circuit to sample to B, and the low limit of output current feedback signal is to microprocessor;
Said low polygonal voltage sample circuit is used for the voltage of B end is sampled, and the low polygonal voltage of output feeds back signal to microprocessor;
Said microprocessor; Output flash drive control signal is controlled opening and closing of flash driving circuit; Opening and closing of limit driving circuit hanged down in the drive control signal control of the low limit of output; And hold current sample, B in the flash driving circuit to hold the current sample in the driving circuit of low limit, the voltage sample output fuel metering valve of B end to drive diagnostic result according to A, the microprocessor work process is as shown in Figure 3, may further comprise the steps:
One. microprocessor output flash drive control signal control flash driving circuit cuts out, and the low limit of drive control signal control, the low limit of output driving circuit cuts out, and makes fuel metering valve be in off working state;
Two. under fuel metering valve is in off working state, if the voltage of B end is more than or equal to setting low pressure and smaller or equal to setting high pressure, judging that then A end, B end with all not having short circuit between ground or the power supply, carry out step 3; If the voltage of B end, is then judged A end or B end shorted to earth less than setting low pressure, carry out step 5; If the voltage of B end, judges then that A end or B end to power supply short circuit, carry out step 7 greater than setting high pressure;
Three. microprocessor output flash drive control signal control flash driving circuit is opened, and the low limit of drive control signal control, the low limit of output driving circuit is opened, and makes fuel metering valve get into duty;
Four. after fuel metering valve gets into duty,
If A holds electric current or the B in the flash driving circuit to hold the electric current in the driving circuit of low limit to be higher than the high electric current of setting, then microprocessor judges is the side a and b short circuit, and output side a and b short circuit diagnostic message gets into step 9 then;
If A holds electric current or the B in the flash driving circuit to hold the electric current in the driving circuit of low limit to be lower than the setting low current, then microprocessor judges is the side a and b open circuit, and output side a and b open circuit diagnostic message gets into step 9 then;
If A holds electric current or the B in the flash driving circuit to hold the electric current that hangs down in the driving circuit of limit greater than setting low current less than setting high electric current; Then microprocessor judges is that side a and b normally connects; The normal connection diagnostic information of output side a and b gets into step 9 then;
Five. microprocessor output flash drive control signal control flash driving circuit is opened;
Six. after the flash driving circuit is opened,
If A holds electric current in the flash driving circuit more than or equal to setting high electric current, then microprocessor judges is an A end shorted to earth, and output A end shorted to earth diagnostic message gets into step 9 then;
Otherwise microprocessor judges is a B end shorted to earth, and output B end shorted to earth diagnostic message gets into step 9 then;
Seven. the low limit of drive control signal control, the low limit of microprocessor output driving circuit is opened;
Eight. after low limit driving circuit is opened,
If B holds the electric current that hangs down in the driving circuit of limit more than or equal to setting high electric current, then microprocessor judges is that B holds power supply short circuit, and output B end gets into step 9 then to the power supply short circuit diagnostic message;
Otherwise microprocessor judges is that A holds power supply short circuit, and output A end gets into step 9 then to the power supply short circuit diagnostic message;
Nine. diagnosis finishes.
One preferred embodiment, fuel metering valve driving power voltage is 12V, and setting low pressure is 0.5V, and the setting high pressure is 4.5V, and the setting low current is 0.2A, setting high electric current is 10A.
Fuel metering valve of the present invention drives diagnostic system; Fuel metering valve is connect flash driving circuit end be defined as the A end; Connect low limit driving circuit end and be defined as the B end; The flash current sampling circuit is set holds the electric current in the flash driving circuit to sample, low limit current sampling circuit is set holds the electric current in the driving circuit of low limit to sample, low polygonal voltage sample circuit is set the voltage of B end is sampled B to A;
Under fuel metering valve is in off working state; The voltage of B end is lower than when setting low pressure; A end or B end shorted to earth are described; After the flash driving circuit was opened, A held the electric current in the flash driving circuit can surpass the high electric current of setting when A end shorted to earth, and therefore microprocessor judges A end shorted to earth;
Under fuel metering valve is in off working state; The voltage of B end is higher than when setting high pressure; Explain that A end or B end are to power supply short circuit; After low limit driving circuit was opened, B held the electric current in the driving circuit of low limit can surpass the high electric current of setting when B holds power supply short circuit, and therefore microprocessor is judged B and held power supply short circuit;
After fuel metering valve gets into duty; The A end is equivalent to power end; The B end is equivalent to ground, when A end and B terminal shortcircuit, just is equivalent to power supply and ground short circuit; A holds electric current or the B in the flash driving circuit to hold the electric current in the driving circuit of low limit can surpass the high electric current of setting, and therefore microprocessor judges A end and B terminal shortcircuit;
After fuel metering valve gets into duty; The A end is equivalent to power end; The B end is equivalent to ground, if A end and B hold when opening a way, whole driving loop will not have electric current and produce; A holds electric current or the B in the flash driving circuit to hold the electric current in the driving circuit of low limit can be lower than the setting low current, and therefore microprocessor judges A end and B end open circuit.
Fuel metering valve of the present invention drives diagnostic system; Combine drive control signal comprehensively to judge fuel metering valve again according to feedback signal and drive concrete fault; Can detect and judge A end shorted to earth, the B end to power supply short circuit, B end shorted to earth, A end and B terminal shortcircuit, six kinds of faults of A end and B end open circuit, realizes that above fuel metering valve is driven six kinds of fault modes to be diagnosed to power supply short circuit, A end.
Claims (4)
1. a fuel metering valve drives diagnostic system; Comprise microprocessor, flash driving circuit, low limit driving circuit, fuel metering valve is through flash driving circuit BOR Bunker of Redelivery metering valve driving power, through low limit driving circuit ground connection; Fuel metering valve is connect flash driving circuit end be defined as the A end; Connect low limit driving circuit end and be defined as the B end, it is characterized in that, also comprise flash current sampling circuit, low limit current sampling circuit, low polygonal voltage sample circuit;
Said flash current sampling circuit is used for holding the electric current of flash driving circuit to sample to A;
Said low limit current sampling circuit is used for holding the electric current of low limit driving circuit to sample to B;
Said low polygonal voltage sample circuit is used for the voltage of B end is sampled;
Said microprocessor; Output flash drive control signal is controlled opening and closing of flash driving circuit; Opening and closing of limit driving circuit hanged down in the drive control signal control of the low limit of output, and holds current sample, B in the flash driving circuit to hold the current sample in the driving circuit of low limit, the voltage sample output fuel metering valve of B end to drive diagnostic result according to A.
2. fuel metering valve according to claim 1 drives diagnostic system, it is characterized in that said microprocessor work process is following:
One. microprocessor output flash drive control signal control flash driving circuit cuts out, and the low limit of drive control signal control, the low limit of output driving circuit cuts out, and makes fuel metering valve be in off working state;
Two. under fuel metering valve is in off working state, if the voltage of B end is more than or equal to setting low pressure and smaller or equal to setting high pressure, then carrying out step 3; If the voltage of B end then carries out step 5 less than setting low pressure; If the voltage of B end then carries out step 7 greater than setting high pressure;
Three. microprocessor output flash drive control signal control flash driving circuit is opened, and the low limit of drive control signal control, the low limit of output driving circuit is opened, and makes fuel metering valve get into duty;
Four. after fuel metering valve gets into duty,
If A holds electric current or the B in the flash driving circuit to hold the electric current in the driving circuit of low limit to be higher than the high electric current of setting, then microprocessor output side a and b short circuit diagnostic message gets into step 9 then;
If A holds electric current or the B in the flash driving circuit to hold the electric current in the driving circuit of low limit to be lower than the setting low current, then microprocessor output side a and b open circuit diagnostic message gets into step 9 then;
Five. microprocessor output flash drive control signal control flash driving circuit is opened;
Six. after the flash driving circuit is opened,
If A holds electric current in the flash driving circuit more than or equal to setting high electric current, then microprocessor output A end shorted to earth diagnostic message gets into step 9 then;
Otherwise microprocessor output B end shorted to earth diagnostic message gets into step 9 then;
Seven. the low limit of drive control signal control, the low limit of microprocessor output driving circuit is opened;
Eight. after low limit driving circuit is opened,
If B holds the electric current that hangs down in the driving circuit of limit more than or equal to setting high electric current, then microprocessor output B end gets into step 9 then to the power supply short circuit diagnostic message;
Otherwise microprocessor output A end gets into step 9 then to the power supply short circuit diagnostic message;
Nine. diagnosis finishes.
3. fuel metering valve according to claim 2 drives diagnostic system; It is characterized in that; In the step 4, after fuel metering valve gets into duty, if A holds electric current or B in the flash driving circuit to hold the electric current that hangs down in the driving circuit of limit more than or equal to the setting low current and smaller or equal to setting high electric current; Then the normal connection diagnostic information of microprocessor output side a and b gets into step 9 then.
4. fuel metering valve according to claim 2 drives diagnostic system, it is characterized in that fuel metering valve driving power voltage is 12V; Said setting low pressure is 0.5V; Said setting high pressure is 4.5V, and said setting low current is 0.2A, and the high electric current of said setting is 10A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110079351.2A CN102721894B (en) | 2011-03-31 | 2011-03-31 | Fuel metering valve drive diagnostic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110079351.2A CN102721894B (en) | 2011-03-31 | 2011-03-31 | Fuel metering valve drive diagnostic system |
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| Publication Number | Publication Date |
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| CN102721894A true CN102721894A (en) | 2012-10-10 |
| CN102721894B CN102721894B (en) | 2014-10-22 |
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| CN201110079351.2A Expired - Fee Related CN102721894B (en) | 2011-03-31 | 2011-03-31 | Fuel metering valve drive diagnostic system |
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Cited By (8)
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| CN103176101A (en) * | 2013-03-05 | 2013-06-26 | 中联重科股份有限公司 | Line fault detection method, equipment and system |
| CN107782563A (en) * | 2017-10-18 | 2018-03-09 | 重庆市弘鼎圣科技有限公司 | Car fault auto-detecting system |
| CN108519549A (en) * | 2018-03-21 | 2018-09-11 | 宝沃汽车（中国）有限公司 | Method for diagnosing faults, device, keyless entry and starter, vehicle |
| CN109725210A (en) * | 2017-10-31 | 2019-05-07 | 长城汽车股份有限公司 | A kind of signal acquisition circuit, engine controller and signal acquisition method |
| US10340908B2 (en) | 2016-07-25 | 2019-07-02 | Continental Automotive Systems, Inc. | Half-bridge driver fault diagnostic system and method |
| CN111090272A (en) * | 2019-12-11 | 2020-05-01 | 一汽解放汽车有限公司 | Fault diagnosis device and method and vehicle |
| CN111766502A (en) * | 2019-04-01 | 2020-10-13 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method |
| CN114415065A (en) * | 2022-01-18 | 2022-04-29 | 潍柴动力股份有限公司 | Fault detection method, device, equipment and medium for solenoid valve |
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| CN111766502A (en) * | 2019-04-01 | 2020-10-13 | 宁德时代新能源科技股份有限公司 | Fault detection circuit and fault detection method |
| CN111090272A (en) * | 2019-12-11 | 2020-05-01 | 一汽解放汽车有限公司 | Fault diagnosis device and method and vehicle |
| CN111090272B (en) * | 2019-12-11 | 2021-09-28 | 一汽解放汽车有限公司 | Fault diagnosis device and method and vehicle |
| CN114415065A (en) * | 2022-01-18 | 2022-04-29 | 潍柴动力股份有限公司 | Fault detection method, device, equipment and medium for solenoid valve |
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Granted publication date: 20141022 Termination date: 20160331 |