CN205503330U - Oil pump electromagnetic valve drive circuit based on current feedback - Google Patents
Oil pump electromagnetic valve drive circuit based on current feedback Download PDFInfo
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- CN205503330U CN205503330U CN201620264242.6U CN201620264242U CN205503330U CN 205503330 U CN205503330 U CN 205503330U CN 201620264242 U CN201620264242 U CN 201620264242U CN 205503330 U CN205503330 U CN 205503330U
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Abstract
The utility model discloses oil pump electromagnetic valve drive circuit based on current feedback, including the oil pump solenoid valve, a single -chip microcomputer, oil pump electromagnetic valve drive circuit and output of oil pump solenoid valve and current feedback circuit, the drive signal of the time processing unit production in the singlechip connects in the input of oil pump electromagnetic valve drive circuit, the oil pump solenoid valve is connected in the output of oil pump electromagnetic valve drive circuit, output of oil pump solenoid valve and current feedback circuit's input is connected with the oil pump solenoid valve, output of oil pump solenoid valve and current feedback circuit's output is connected with the AD sampling processing unit in the singlechip gives the singlechip with transient current with the oil pump solenoid valve and average current feedback. The PWM signal driver oil pump solenoid valve that this circuit can send according to the singlechip to press in capable electric current closed -loop control according to the real -time current feedback of oil pump solenoid valve to the rail and maintain the purpose that steady rail was pressed in order to reach the accuracy, satisfy the high pressure common rail diesel engine demand that required different rails were pressed under different work condition completely.
Description
Technical field
This utility model relates to a kind of oil pump driving circuit for electromagnetic valve based on current feedback.
Background technology
The accurately control of high-pressure common rail pressure is the key factor that electronic control common rail system is better than tradition oil supply system, and therefore the control of common rail pressure is a key link of High Pressure Common Rail Fuel Injection System exploitation, and it is the key that high pressure co-rail system mates with electronic controlled diesel.Diesel engine is under certain operating mode, it is desirable to the pressure stability in common rail is at a certain numerical value, and rail pressure fluctuation is the smaller the better, is so advantageously implemented the accurate control of distributive value.It is thus desirable to good oil pump driving circuit for electromagnetic valve coordinates the rail pressure control of rational control strategy guarantee safety and stability.
The diesel oil of certain flow is injected high-pressure common-rail pipe and forms rail pressure by high-pressure oil pump, and therefore the flow of high-pressure oil pump output fuel oil directly determines the size of rail pressure.In order to better control over transient response during rail pressure change, use rail pressure closed loop control algorithm based on current feedback, it is possible to realize the oil inlet quantity of more reasonably control oil pump, show more preferable transient control effect.
Utility model content
This utility model provides a kind of oil pump driving circuit for electromagnetic valve based on current feedback.
This utility model overcomes its technical problem be the technical scheme is that
A kind of oil pump driving circuit for electromagnetic valve based on current feedback, including oil pump electromagnetic valve, single-chip microcomputer, oil pump driving circuit for electromagnetic valve and oil pump electromagnetic valve export and current feedback circuit, what the time processing unit in single-chip microcomputer produced drives signal to be connected to the input of oil pump driving circuit for electromagnetic valve, oil pump electromagnetic valve is connected to the outfan of oil pump driving circuit for electromagnetic valve, the output of oil pump electromagnetic valve is connected with oil pump electromagnetic valve with the input of current feedback circuit, the output of oil pump electromagnetic valve be connected with the AD sample processing unit in single-chip microcomputer with the outfan of current feedback circuit with by the transient current of oil pump electromagnetic valve and average current feedback to single-chip microcomputer.
Preferred according to this utility model, described oil pump driving circuit for electromagnetic valve includes driving chip IC2, resistance R03, R04, R05 and R06 and electric capacity C05, C06 and RC75, the pin 1,19,20,10,11,12,15,16 of driving chip IC2 connects power supply, pin 2,6 ground connection of driving chip IC2；One end of R05 is connected with the pin 3 of driving chip IC2, and the other end of R05 is connected with the pin ETPUA0 of single-chip microcomputer and by R04 ground connection；One end of R06 is connected with the pin EMIOS0 of single-chip microcomputer, and the other end of R06 is connected with the pin 4 of driving chip IC2 and connects power supply by R03；After C05 with C06 parallel connection, one end ground connection, the other end are connected with the pin 10 of driving chip IC2；One termination power of RC75, the other end of RC75 is connected with the pin IN+ of driving chip IC2；
The output of described oil pump electromagnetic valve and current feedback circuit include current feedback chip IC 1 and oil pump electromagnetic valve output circuit, described oil pump electromagnetic valve output circuit includes diode D01, diode D02A and D02B, resistance R01 and R02 and electric capacity C01, C02, C03 and C04, the negative pole of D01 and the output pin IN+ of driving chip IC2, after R02 and C03 parallel connection, the pin 8 with current feedback chip IC 1 is connected, the positive pole of D01 is connected and ground connection with one end of oil pump electromagnetic valve, the other end of R02 is connected with oil pump electromagnetic valve and is connected to the pin 1 of current feedback chip IC 1, the other end ground connection of C03；The negative pole of D02A is connected to the pin 5 of current feedback chip IC 1, the plus earth of D02A with the positive pole of D02B after being connected, the negative pole of D02B connects power supply；The pin 5 of current feedback chip IC 1 exports transient current and is connected to the pin AN1 of single-chip microcomputer and by C04 ground connection, changes into average current by R01 and C02 simultaneously and is connected to the pin AN2 of single-chip microcomputer；The pin 6 and 7 of current feedback chip IC 1 connects power supply and by C01 ground connection, pin 2 and 3 ground connection of current feedback chip IC 1.
Preferred according to this utility model, described single-chip microcomputer is 32 single-chip microcomputer MPC5644A of Freescale company；Driving chip IC2 is two-channel intelligent high side power driving chip BTS740S2, and it has been internally integrated protection and diagnostic function, and fault message can be fed back in real time the pin EMIOS0 of single-chip microcomputer by feedback of status pin；The model of current feedback chip IC 1 is AD8205, and its circuit structure is simple and reliable, and output current precision is high, and has outstanding common mode rejection ratio, it is achieved sampling and the conditioning to transient current.
The beneficial effects of the utility model are:
Circuit structure of the present utility model is simple and practical, integrated level is high, oil pump electromagnetic valve can be driven according to the pwm signal that single-chip microcomputer sends, and carry out closed-loop current control to reach accurately to maintain the purpose of steady rail pressure according to the real-time current feedback tracking pressure of oil pump electromagnetic valve, it is also equipped with perfect self-diagnostic function simultaneously, Design of High Pressure Common Rail Diesel Engine demand of required different rail pressures under different operating modes can be met completely, the control to oil pump electromagnetic valve aperture can be reliably achieved, can be widely applied in the control of flow, pressure solenoid valve.
Accompanying drawing explanation
Fig. 1 is principle schematic of the present utility model.
Fig. 2 is the circuit connection diagram of this utility model single-chip microcomputer and driving chip.
Fig. 3 is the circuit connection diagram of this utility model oil pump electromagnetic valve and current feedback chip.
In figure, 1, oil pump electromagnetic valve, 2, single-chip microcomputer, 3, oil pump driving circuit for electromagnetic valve, 4, the output of oil pump electromagnetic valve and current feedback circuit, 21, time processing unit, 22, AD sample processing unit.
Detailed description of the invention
Being better understood from this utility model for the ease of those skilled in the art, be described in further details this utility model with specific embodiment below in conjunction with the accompanying drawings, following is only exemplary not limit protection domain of the present utility model.
As shown in Figure 1, oil pump driving circuit for electromagnetic valve based on current feedback of the present utility model, including oil pump electromagnetic valve 1, single-chip microcomputer 2, oil pump driving circuit for electromagnetic valve 3 and oil pump electromagnetic valve export and current feedback circuit 4, what the time processing unit 21 in single-chip microcomputer 2 produced drives signal to be connected to the input of oil pump driving circuit for electromagnetic valve 3, oil pump electromagnetic valve 1 is connected to the outfan of oil pump driving circuit for electromagnetic valve 3, the output of oil pump electromagnetic valve is connected with oil pump electromagnetic valve 1 with the input of current feedback circuit 4, the output of oil pump electromagnetic valve be connected with the AD sample processing unit 22 in single-chip microcomputer 2 with the outfan of current feedback circuit 4 with by the transient current of oil pump electromagnetic valve and average current feedback to single-chip microcomputer 2.
As shown in Figure 2, described oil pump driving circuit for electromagnetic valve 3 includes driving chip BTS740S2, resistance R03, R04, R05 and R06 and electric capacity C05, C06 and RC75, the pin 1,19,20,10,11,12,15,16 of driving chip BTS740S2 connects 24V power supply, pin 2,6 ground connection of driving chip BTS740S2；One end of R05 is connected with the pin 3 of driving chip BTS740S2, and the other end of R05 is connected with the pin ETPUA0 of single-chip microcomputer MPC5644A and by R04 ground connection；One end of R06 is connected with the pin EMIOS0 of single-chip microcomputer MPC5644A, and the other end of R06 is connected with the pin 4 of driving chip BTS740S2 and connects 5V power supply by R03；After C05 with C06 parallel connection, one end ground connection, the other end are connected with the pin 10 of driving chip BTS740S2；The one termination 24V power supply of current-limiting resistance RC75, the other end of current-limiting resistance RC75 is connected with the pin IN+ of driving chip BTS740S2.As shown in Figure 3, the output of described oil pump electromagnetic valve and current feedback circuit 4 include current feedback chip AD8205 and oil pump electromagnetic valve output circuit, described oil pump electromagnetic valve output circuit includes sustained diode 01, overvoltage protection diode D02A and D02B, sampling resistor R01 and R02 and filter capacitor C01, C02, C03 and C04, the negative pole of D01 and the output pin IN+ of driving chip BTS740S2, after sampling resistor R02 and C03 parallel connection, the pin 8 with current feedback chip AD8205 is connected, the positive pole of D01 is connected and ground connection with one end of oil pump electromagnetic valve 1, the other end of R02 is connected with oil pump electromagnetic valve and is connected to the pin 1 of current feedback chip AD8205, the other end ground connection of C03；The negative pole of D02A is connected to the pin 5 of current feedback chip AD8205, the plus earth of D02A with the positive pole of D02B after being connected, the negative pole of D02B connects 5V power supply；The pin 5 of current feedback chip AD8205 exports transient current and is connected to the pin AN1 of single-chip microcomputer MPC5644A and by C04 ground connection, changes into average current by R01 and C02 simultaneously and is connected to the pin AN2 of single-chip microcomputer MPC5644A；The pin 6 and 7 of current feedback chip AD8205 connects power supply and by C01 ground connection, pin 2 and 3 ground connection of current feedback chip AD8205.The resistance using resistance R02 can be calculated according to the operating current of load and current feedback chip AD8205 gain.
When the energising of oil pump electromagnetic valve coil produces magnetic field, attracting armature to overcome spring force, promote the movement of valve core of the electromagnetic valve, according to the current flow characteristic of oil pump electromagnetic valve, along with the increase of driving electric current, flow is progressively smaller until closedown.
When single-chip microcomputer MPC5644A is high level by the PWM drive signal that pin ETPUA0 produces, MOSFET conducting within driving chip BTS740S2, pin OUT1 output is conducting to 24V supply voltage, 24V supply voltage is applied on inductive load oil pump electromagnetic valve 1 by sampling resistor R02, driving oil pump electromagnetic valve 1 to work, the transient current on oil pump electromagnetic valve 1 increases.When the PWM drive signal that ETPUA0 produces is low level, the MOSFET within driving chip BTS740S closes, and inductive load oil pump electromagnetic valve 1, diode D01 and sampling resistor R02 form freewheeling path, and the transient current on oil pump electromagnetic valve 1 reduces.Resistance R01 and electric capacity C02 can be converted into average current the transient current of oil pump electromagnetic valve, in rail pressure closed loop control algorithm based on current feedback, thus realizes stability and the transient response of rail pressure control.
Above only describes ultimate principle of the present utility model and preferred implementation, those skilled in the art can many changes may be made and improves according to foregoing description, and these changes and improvements should belong to protection domain of the present utility model.
Claims (3)
1. an oil pump driving circuit for electromagnetic valve based on current feedback, it is characterized in that: include oil pump electromagnetic valve (1), single-chip microcomputer (2), oil pump driving circuit for electromagnetic valve (3) and oil pump electromagnetic valve export and current feedback circuit (4), the driving signal that time processing unit (21) in single-chip microcomputer (2) produces is connected to the input of oil pump driving circuit for electromagnetic valve (3), oil pump electromagnetic valve (1) is connected to the outfan of oil pump driving circuit for electromagnetic valve (3), the output of oil pump electromagnetic valve is connected with oil pump electromagnetic valve (1) with the input of current feedback circuit (4), the output of oil pump electromagnetic valve be connected with the AD sample processing unit (22) in single-chip microcomputer (2) with the outfan of current feedback circuit (4) with by the transient current of oil pump electromagnetic valve and average current feedback to single-chip microcomputer (2).
Circuit the most according to claim 1, it is characterised in that:
Described oil pump driving circuit for electromagnetic valve (3) includes driving chip IC2, resistance R03, R04, R05 and R06 and electric capacity C05, C06 and RC75, the pin 1,19,20,10,11,12,15,16 of driving chip IC2 connects power supply, pin 2,6 ground connection of driving chip IC2；One end of R05 is connected with the pin 3 of driving chip IC2, and the other end of R05 is connected with the pin ETPUA0 of single-chip microcomputer (2) and by R04 ground connection；One end of R06 is connected with the pin EMIOS0 of single-chip microcomputer (2), and the other end of R06 is connected with the pin 4 of driving chip IC2 and connects power supply by R03；After C05 with C06 parallel connection, one end ground connection, the other end are connected with the pin 10 of driving chip IC2；One termination power of RC75, the other end of RC75 is connected with the pin IN+ of driving chip IC2；
The output of described oil pump electromagnetic valve and current feedback circuit (4) include current feedback chip IC 1 and oil pump electromagnetic valve output circuit, described oil pump electromagnetic valve output circuit includes diode D01, diode D02A and D02B, resistance R01 and R02 and electric capacity C01, C02, C03 and C04, the negative pole of D01 and the output pin IN+ of driving chip IC2, after R02 and C03 parallel connection, the pin 8 with current feedback chip IC 1 is connected, the positive pole of D01 is connected and ground connection with one end of oil pump electromagnetic valve (1), the other end of R02 is connected with oil pump electromagnetic valve and is connected to the pin 1 of current feedback chip IC 1, the other end ground connection of C03；The negative pole of D02A is connected to the pin 5 of current feedback chip IC 1, the plus earth of D02A with the positive pole of D02B after being connected, the negative pole of D02B connects power supply；The pin 5 of current feedback chip IC 1 exports transient current and is connected to the pin AN1 of single-chip microcomputer (2) and by C04 ground connection, changes into average current by R01 and C02 simultaneously and is connected to the pin AN2 of single-chip microcomputer (2)；The pin 6 and 7 of current feedback chip IC 1 connects power supply and by C01 ground connection, pin 2 and 3 ground connection of current feedback chip IC 1.
Circuit the most according to claim 2, it is characterised in that: the model of described single-chip microcomputer (2) is MPC5644A；The model of driving chip IC2 is BTS740S2；The model of current feedback chip IC 1 is AD8205.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620264242.6U CN205503330U (en) | 2016-04-01 | 2016-04-01 | Oil pump electromagnetic valve drive circuit based on current feedback |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620264242.6U CN205503330U (en) | 2016-04-01 | 2016-04-01 | Oil pump electromagnetic valve drive circuit based on current feedback |
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| Publication Number | Publication Date |
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| CN205503330U true CN205503330U (en) | 2016-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620264242.6U Active CN205503330U (en) | 2016-04-01 | 2016-04-01 | Oil pump electromagnetic valve drive circuit based on current feedback |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105697208A (en) * | 2016-04-01 | 2016-06-22 | 中国重汽集团济南动力有限公司 | Oil pump solenoid valve drive circuit based on current feedback |
-
2016
- 2016-04-01 CN CN201620264242.6U patent/CN205503330U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105697208A (en) * | 2016-04-01 | 2016-06-22 | 中国重汽集团济南动力有限公司 | Oil pump solenoid valve drive circuit based on current feedback |
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