CN210889171U - Solenoid valve type injector drive circuit system - Google Patents
Solenoid valve type injector drive circuit system Download PDFInfo
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- CN210889171U CN210889171U CN201920825819.XU CN201920825819U CN210889171U CN 210889171 U CN210889171 U CN 210889171U CN 201920825819 U CN201920825819 U CN 201920825819U CN 210889171 U CN210889171 U CN 210889171U
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- 238000001514 detection method Methods 0.000 claims abstract description 68
- 239000003990 capacitor Substances 0.000 claims description 27
- 238000001914 filtration Methods 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 6
- 238000004146 energy storage Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims description 2
- 238000007493 shaping process Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000000889 atomisation Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 238000012423 maintenance Methods 0.000 description 5
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- 238000004519 manufacturing process Methods 0.000 description 4
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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Abstract
A solenoid valve type injector driving circuit system relates to a driving circuit system, which comprises a vehicle-mounted ECU (electronic control Unit), an injector module and an external driving system, wherein the external driving system comprises an input detection circuit, an MCU (microprogrammed control unit) microprocessor, a power supply circuit, an output control circuit, a voltage detection circuit and a current detection circuit; the vehicle-mounted ECU is connected with the MCU through the input detection circuit; the output end of the MCU microprocessor is respectively connected with the power circuit and the output control circuit; the power circuit is connected with the ejector module through the output control circuit. The utility model discloses a detect the actual electric current that passes through the sprayer, adjust power supply circuit's output voltage to guarantee not to influence under the flow of sprayer, the prerequisite of atomization effect, reduce drive power, thereby reduce sprayer calorific capacity, make it can be in high temperature environment reliable and stable work for a long time, solved the problem that the long-term circular telegram of sprayer burns out solenoid, guarantee the reliability and the stability of product, easily use widely.
Description
Technical Field
The utility model relates to a drive circuit system, especially a solenoid valve formula sprayer drive circuit system.
Background
At present, the driving circuit system for the solenoid valve type injector is mainly divided into two types, one type is a common voltage driving method, a discrete component device or a special integrated chip is adopted for driving, the driving is mature and stable, but the power is uncontrollable, the heat productivity of the injector is high, the requirement on the manufacturing process of the injector is high when the injector is used particularly in a high-temperature environment, and the other type is a current driving method, which is mature and applied on the market at present and only comprises special chips of BOSCH and NXP, but the circuits of the two special chips are complex.
Disclosure of Invention
The to-be-solved technical problem of the utility model is: the electromagnetic valve type injector driving circuit system is provided to solve the defects of large heat productivity of an injector, high requirement on the manufacturing process of the injector and complex circuit in the prior art.
The technical scheme for solving the technical problems is as follows: the utility model provides a solenoid valve formula sprayer drive circuit system, includes on-vehicle ECU, sprayer module, still includes external drive system, external drive system include input detection circuitry, MCU microprocessor, power supply circuit, output control circuit, voltage detection circuit, current detection circuit, wherein:
the input detection circuit is used for detecting an input signal of the ejector module, the input end of the input detection circuit is connected with the output end of the vehicle-mounted ECU, and the output end of the input detection circuit is connected with the input end of the MCU microprocessor;
the MCU microprocessor is used as a control core and is responsible for controlling each module, and the output end of the MCU microprocessor is respectively connected with the input ends of the power supply circuit and the output control circuit;
the power circuit is used for providing Vbat voltage or VCCL voltage for the injector module; the Vbat end and the VCCL end of the power supply circuit are respectively connected with the input end of the output control circuit;
the output control circuit is used for providing Vbat voltage for the injector module when the injector module is opened and providing VCCL voltage for the injector module in a maintaining period after the injector module is successfully opened; the output end of the output control circuit is connected with the input end of the ejector module;
the voltage detection circuit is used for detecting the output voltage of the power supply circuit, the input end of the voltage detection circuit is connected with the output end of the power supply circuit, and the output end of the voltage detection circuit is connected with the MCU;
the current detection circuit is used for detecting the magnitude of current passing through the injector module; the input end of the current detection circuit is connected with the output end of the ejector module, and the output end of the current detection circuit is connected with the MCU microprocessor.
The utility model discloses a further technical scheme is: the Vbat voltage is 10V-32V, and the VCCL voltage is 2V-Vbat.
The utility model discloses a further technical scheme is: the input detection circuit comprises a diode D2 for reverse connection prevention isolation protection, a pull-up resistor R4 and a NOT gate IC 1; the collected signal is INPUT from the cathode of the diode D2, the low level is effective, meanwhile, the default level is protected to be the high level through the pull-up resistor R4, the signal is output from the anode of the diode D2, is subjected to current limiting through the current limiting resistor R5, is subjected to shaping through the IC1C end and the IC1D end of the NOT gate IC1, and is sent to the INJ1_ INPUT end of the MCU microprocessor for operation and processing.
The utility model discloses a further technical scheme is again: the input detection circuit further comprises a filter capacitor C4 for filtering to ensure signal stability, and the filter capacitor C4 is connected between the anode of the diode D2 and the ground terminal.
The utility model discloses a further technical scheme is again: a voltage regulator tube Z2 is also adopted between the input ends of the current limiting resistor R5 and the NAND gate IC1 for clamping so as to protect the NOT gate chip from overvoltage or overcurrent.
The utility model discloses a further technical scheme is: the power supply circuit is a DC-DC voltage reduction circuit and comprises a triode Q9, an MOS tube Q10, a Vbat end and a VCCL end; the base electrode of the triode Q9 is connected with the PWM _ DC end of the MCU microprocessor, the emitter electrode of the triode Q9 is grounded, the collector electrode of the triode Q9 is connected with one input end of the MOS tube Q10, the other input end of the MOS tube Q10 is connected with the Vbat end, and the output end of the MOS tube Q10 is connected with the VCCL end; according to the current required by the injector to maintain the oil injector and the real-time feedback of the acquired voltage at the AD4 end of the MCU microprocessor, the PWM _ DC end of the MCU microprocessor outputs a certain PWM frequency, the triode Q9 is controlled to further control the conduction of the MOS transistor Q10, and the output voltage VCCL at the VCCL end is controlled.
The utility model discloses a further technical scheme is again: an inductor L4 and a capacitor C41 for energy storage are also connected between the MOS tube Q10 and the VCCL end; a regulator D17 for freewheeling is connected between the MOS transistor Q10 and the inductor L4.
The utility model discloses a further technical scheme is again: the output control circuit is a dual-voltage control circuit and comprises an INJ0_ H input end, an INJ0_ L input end, an MOS tube Q1, an MOS tube Q3 and a diode D7, wherein the INJ0_ H input end and the INJ0_ L input end are respectively connected with the output end of the MCU microprocessor, the INJ0_ H input end is connected with one input end of the MOS tube Q1, and the other input end of the MOS tube Q1 is connected with the Vbat end of the power supply circuit; the output end of the MOS tube Q1 is connected with the input end of the ejector module; the input end of the INJ0_ L is connected with one input end of the MOS tube Q3, and the output end of the MOS tube Q3 is connected with the input end of the ejector module; the anode of the diode D7 is connected with the VCCL terminal, and the cathode of the diode D7 is connected with the input terminal of the ejector module; when the ejector is opened, the input end of INJ0_ H firstly inputs high level to simultaneously open the MOS tube Q1 and the MOS tube Q3, at the moment, the voltage of the Vbat end is higher than that of the VCCL end, the diode D7 is not conducted in the reverse direction, the VCCL voltage cannot pass through the ejector coil, and the Vbat voltage ensures that the ejector is quickly opened through the ejector coil; when the injector is opened, the input end of the INJ0_ H inputs a low level to the MOS tube Q1, the MOS tube Q1 is turned off, and a lower voltage VCCL passes through the coil of the injector to ensure that the current passing through the coil of the injector maintains the attraction of the valve core with a smaller current so as to reduce the power consumption of the injector; when the injector needs to be closed, the INJ0_ L input end inputs a low level to the MOS transistor Q3, and then the injector is closed, and one working cycle is completed.
The utility model discloses a further technical scheme is again: the voltage detection circuit is a voltage division circuit comprising a resistor R47, a resistor R3 and a capacitor C37, one end of the resistor R47 is connected with the VCCL end of the power circuit, and the other end of the resistor R47 is connected with a resistor R3 in series and then is connected with the ground end; the AD4 end of the MCU microprocessor is connected in parallel to the resistor R47, the input end of the AD4 end of the MCU microprocessor is also connected in series with the capacitor C37, and the capacitor C37 plays a role in filtering, so that a current signal entering the AD4 end of the MCU microprocessor is stable, reliable and free of interference.
The utility model discloses a further technical scheme is: the current detection circuit is a current sampling circuit comprising a resistor R37 and a capacitor C15, the resistor R37 is a high-precision sampling resistor, one end of the resistor R37 is connected with an MOS transistor Q3, and the other end of the resistor R37 is grounded; the AD0 end of the MCU microprocessor is connected between the MOS transistor Q3 and the resistor R37, the input end of the AD0 end of the MCU microprocessor is also connected with the capacitor C15, and the capacitor C15 is used for filtering, so that the current signal entering the AD0 end of the MCU microprocessor is stable, reliable and free of interference.
Since the technical scheme is used, the utility model discloses a solenoid valve formula sprayer drive circuit system compares with prior art, has following beneficial effect:
1. can maintain normal opening time and atomization effect of the injector module
The utility model discloses a vehicle-mounted ECU, sprayer module, external drive system, and external drive system includes input detection circuitry, MCU microprocessor, power supply circuit, output control circuit, voltage detection circuit, current detection circuit, wherein power supply circuit is used for providing Vbat voltage or VCCL voltage for the sprayer module; the output control circuit is used for providing Vbat voltage for the injector module when the injector module is opened and providing VCCL voltage for the injector module in a maintaining period after the injector module is successfully opened; the voltage detection circuit is used for detecting the output voltage of the power supply circuit, and the current detection circuit is used for detecting the current passing through the ejector module.
Because the utility model discloses a through the current that detects actually through the sprayer module, adjust power supply circuit's output voltage, in the opening stage of sprayer module, still provide normal Vbat voltage (be mains voltage) for the sprayer module, consequently, the utility model discloses can keep the normal open time and the atomizing effect of sprayer module.
2. Can effectively reduce the heat productivity of the injector
The utility model discloses a vehicle-mounted ECU, sprayer module, external drive system, and external drive system includes input detection circuitry, MCU microprocessor, power supply circuit, output control circuit, voltage detection circuit, current detection circuit, wherein power supply circuit is used for providing Vbat voltage or VCCL voltage for the sprayer module; the output control circuit is used for providing Vbat voltage for the injector module when the injector module is opened and providing VCCL voltage for the injector module in a maintaining period after the injector module is successfully opened; the voltage detection circuit is used for detecting the output voltage of the power supply circuit, and the current detection circuit is used for detecting the current passing through the ejector module.
Because the utility model discloses a through the electric current that detects actually through the sprayer module, adjust power supply circuit's output voltage, in the maintenance stage after the sprayer module successfully opens, only for the sprayer module provides lower VCCL voltage (the voltage that power supply circuit adjusted out promptly) to but the drive power of greatly reduced sprayer module, thereby reduce the calorific capacity of sprayer module, make this sprayer module can be in the high temperature environment reliable and stable work for a long time.
3. Can reduce the requirement on the manufacturing process of the ejector
Because the utility model discloses in the maintenance stage after injector module successfully opens, only provide lower VCCL voltage for injector module, effectively reduced injector module's calorific capacity to can reduce the requirement to injector manufacturing process.
4. The problem that the injector module is electrified for a long time to generate heat and burn the electromagnetic coil can be solved;
because the utility model discloses in the maintenance stage after injector module successfully opens, only for injector module provides lower VCCL voltage, effectively reduced injector module's calorific capacity to improve injector module long-term circular telegram and generate heat and burn out solenoid's problem.
5. Extending the service life of an injector
Because the utility model discloses in the maintenance phase after injector module successfully opens, only provide lower VCCL voltage for injector module, its drive power is lower, but the calorific capacity of the significantly reduced sprayer to can prolong the life of sprayer.
6. Simple circuit
The utility model discloses only increase one set of external actuating system in original drive circuit, not only the stable performance is reliable, and circuit structure is fairly simple moreover.
7. The cost is low
The utility model discloses an increase one set of external actuating system at original on-vehicle ECU actuating system, this external actuating system can use as external drive on the basis that does not change original on-vehicle system, and its cost is lower, easily uses widely.
8. Wide application range
The utility model discloses except being applicable to methyl alcohol solenoid valve formula sprayer, still applicable to other solenoid valve formula sprayers, its application scope is more extensive.
The technical features of the solenoid valve injector driving circuit system according to the present invention will be further described with reference to the accompanying drawings and embodiments.
Drawings
FIG. 1: example a schematic block diagram of the solenoid valve injector driver circuitry,
FIG. 2: embodiment a circuit schematic of the input detection circuit,
FIG. 3: embodiment one circuit schematic of the power supply circuit,
FIG. 4: embodiment a circuit schematic of the output control circuit,
FIG. 5: embodiment one circuit schematic of the voltage detection circuit,
FIG. 6: embodiment a schematic circuit diagram of the voltage detection circuit connected to the power circuit,
FIG. 7: embodiment a circuit schematic of the current sensing circuit,
FIG. 8: embodiment a schematic circuit diagram of the current detection circuit connected with the output control circuit,
FIG. 9: embodiment A general diagram of a circuit framework of the plug-in driving system,
FIG. 10: example a schematic of the injector module is shown.
In the above drawings, the respective reference numerals are explained as above:
1-a solenoid valve type injector having a solenoid valve,
101-injector body, 102-solenoid.
Detailed Description
The first embodiment is as follows:
a solenoid valve type injector driving circuit system (see figure 1) comprises a vehicle-mounted ECU (electronic control Unit), an injector module and an external driving system, wherein the external driving system comprises an input detection circuit, an MCU (microprogrammed control Unit) microprocessor, a power supply circuit, an output control circuit, a voltage detection circuit and a current detection circuit, and the external driving system comprises a power supply, a solenoid valve, an injector module and a solenoid valve, wherein:
the input detection circuit is used for detecting an input signal of the ejector module, the input end of the input detection circuit is connected with the output end of the vehicle-mounted ECU, and the output end of the input detection circuit is connected with the input end of the MCU microprocessor;
the MCU microprocessor is used as a control core and is responsible for controlling each module, and the output end of the MCU microprocessor is respectively connected with the input ends of the power supply circuit and the output control circuit;
the power circuit is used for providing Vbat voltage or VCCL voltage for the injector module; the Vbat end and the VCCL end of the power supply circuit are respectively connected with the input end of the output control circuit;
the output control circuit is used for providing a Vbat voltage for the ejector module when the ejector module is opened, wherein the Vbat voltage is 10V-32V, and a VCCL voltage is provided for the ejector module in a maintaining stage after the ejector module is successfully opened, and the VCCL voltage is 2V-Vbat; the output end of the output control circuit is connected with the input end of the ejector module;
the voltage detection circuit is used for detecting the output voltage of the power supply circuit, the input end of the voltage detection circuit is connected with the output end of the power supply circuit, and the output end of the voltage detection circuit is connected with the MCU;
the current detection circuit is used for detecting the magnitude of current passing through the injector module; the input end of the current detection circuit is connected with the output end of the ejector module, and the output end of the current detection circuit is connected with the MCU microprocessor.
The MCU microprocessor is provided with an INJ1_ INPUT end, a PWM _ DC end, an AD0 end and an AD4 end, and is connected with the output end of the INPUT detection circuit through the INJ1_ INPUT end so as to collect the INPUT of an original signal; the PWM _ DC terminal is connected to the input terminal of the power circuit, the AD0 terminal is connected to the output terminal of the current detection circuit for receiving the actual current feedback flowing through the injector module, the AD4 terminal is connected to the output terminal of the voltage detection circuit for receiving the voltage feedback of the power circuit, and the MCU microprocessor employs the well-known prior art.
The input detection circuit comprises a diode D2 for anti-reverse isolation protection, a pull-up resistor R4, a NOT gate IC1 and a filter capacitor C4 (see FIG. 2) for filtering and ensuring signal stability; the collected signals are INPUT from the cathode of the diode D2, the low level is effective, meanwhile, the default level is protected to be the high level through the pull-up resistor R4, the signals are output from the anode of the diode D2, after being limited by the current limiting resistor R5, the signals are shaped through the IC1C end and the IC1D end of the NOT gate IC1, and then the signals are sent to the INJ1_ INPUT end of the MCU microprocessor for operation and processing; the filter capacitor C4 is connected between the anode of the diode D2 and the ground. And a 5.1V voltage regulator tube Z2 is also adopted between the input ends of the current limiting resistor R5 and the NAND gate IC1 for clamping so as to protect the NOT gate chip from overvoltage or overcurrent.
The power supply circuit is a DC-DC voltage reduction circuit and comprises a triode Q9, a MOS tube Q10, a Vbat end and a VCCL end (see figure 3); the base electrode of the triode Q9 is connected with the PWM _ DC end of the MCU microprocessor, the emitter electrode of the triode Q9 is grounded, the collector electrode of the triode Q9 is connected with one input end of the MOS tube Q10, the other input end of the MOS tube Q10 is connected with the Vbat end, and the output end of the MOS tube Q10 is connected with the VCCL end; according to current required by a driving ejector to maintain the oil sprayer and collected voltage at the AD4 end of the MCU microprocessor, the PWM _ DC end of the MCU microprocessor outputs certain PWM frequency, the triode Q9 is controlled to further control the conduction of the MOS transistor Q10, and the output voltage VCCL at the VCCL end is controlled; an inductor L4 and a capacitor C41 for energy storage are also connected between the MOS tube Q10 and the VCCL end; a regulator D17 for freewheeling is connected between the MOS transistor Q10 and the inductor L4. The power supply circuit can adjust different voltages according to the coil resistance of the injector and the required holding current.
The output control circuit is a dual-voltage control circuit, and comprises an INJ0_ H input end, an INJ0_ L input end, a MOS transistor Q1, a MOS transistor Q3, and a diode D7 (see fig. 4), wherein the INJ0_ H input end is used for controlling a high end, and the INJ0_ L input end is used for controlling a low end; the input end of the INJ0_ H and the input end of the INJ0_ L are respectively connected with the output end of the MCU microprocessor, the input end of the INJ0_ H is connected with one input end of the MOS tube Q1, and the other input end of the MOS tube Q1 is connected with the Vbat end of the power circuit; the output end of the MOS tube Q1 is connected with the input end of the ejector module; the input end of the INJ0_ L is connected with one input end of the MOS tube Q3, and the output end of the MOS tube Q3 is connected with the input end of the ejector module; the anode of the diode D7 is connected with the VCCL terminal, and the cathode of the diode D7 is connected with the input terminal of the ejector module; when the ejector is opened, the input end of INJ0_ H firstly inputs high level to simultaneously open the MOS tube Q1 and the MOS tube Q3, at the moment, the voltage of the Vbat end is higher than that of the VCCL end, the diode D7 is not conducted in the reverse direction, the VCCL voltage cannot pass through the ejector coil, and the Vbat voltage ensures that the ejector is quickly opened through the ejector coil; when the injector is opened, the input end of the INJ0_ H inputs a low level to the MOS tube Q1, the MOS tube Q1 is turned off, and a lower voltage VCCL passes through the coil of the injector to ensure that the current passing through the coil of the injector maintains the attraction of the valve core with a smaller current so as to reduce the power consumption of the injector; when the injector needs to be closed, the INJ0_ L input end inputs a low level to the MOS transistor Q3, and then the injector is closed, and one working cycle is completed.
The voltage detection circuit is a voltage division circuit (see fig. 5) including a resistor R47, a resistor R3 and a capacitor C37, one end of the resistor R47 is connected to the VCCL end of the power circuit, and the other end of the resistor R47 is connected to the ground after being connected in series with the resistor R3; the AD4 end of the MCU microprocessor is connected in parallel to the resistor R47, the input end of the AD4 end of the MCU microprocessor is also connected in series with the capacitor C37, and the capacitor C37 plays a role in filtering, so that a current signal entering the AD4 end of the MCU microprocessor is stable, reliable and free of interference.
The current detection circuit is a current sampling circuit (see fig. 7) comprising a resistor R37 and a capacitor C15, the resistor R37 is a high-precision sampling resistor, one end of the resistor R37 is connected with the MOS transistor Q3, and the other end of the resistor R37 is grounded; the AD0 end of the MCU microprocessor is connected between the MOS transistor Q3 and the resistor R37, the input end of the AD0 end of the MCU microprocessor is also connected with the capacitor C15, and the capacitor C15 is used for filtering, so that the current signal entering the AD0 end of the MCU microprocessor is stable, reliable and free of interference.
The injector module comprises an injector body and an electromagnetic coil (see fig. 10) arranged in the injector body, wherein the injector body is a common electromagnetic valve type injector body, the resistance value of the electromagnetic coil is 1 omega-3 omega, and the electromagnetic coil is arranged in the injector body and provides a stable magnetic field loop and an instant degaussing function for the injector. When the ejector module is matched with an external drive system for use, the current which is driven by the current and provided for the ejector can be effectively ensured to be completely converted into magnetic field energy by electric energy, the phenomenon that redundant electric energy is converted into heat energy when voltage is driven is avoided, and the heating working condition of the ejector is reduced.
The utility model discloses a theory of operation:
in one pulse, the external drive system adopts dual-power two-stage drive, namely, in the starting stage of the ejector module, normal Vbat voltage is provided for the ejector module, the voltage which is the same as that of the common voltage method drive is achieved, and the starting time is ensured to be consistent with that of the original vehicle-mounted drive; in the maintenance stage of the ejector module, the plug-in driving system provides a lower VCCL voltage for the ejector module so as to keep the valve core in a pull-in state and achieve the purpose of reducing the driving current and reducing the power consumption of the ejector.
Claims (10)
1. A solenoid valve injector drive circuit system includes an on-vehicle ECU, an injector module, characterized in that: still include external actuating system, external actuating system include input detection circuitry, MCU microprocessor, power supply circuit, output control circuit, voltage detection circuit, current detection circuit, wherein:
the input detection circuit is used for detecting an input signal of the ejector module, the input end of the input detection circuit is connected with the output end of the vehicle-mounted ECU, and the output end of the input detection circuit is connected with the input end of the MCU microprocessor;
the MCU microprocessor is used as a control core and is responsible for controlling each module, and the output end of the MCU microprocessor is respectively connected with the input ends of the power supply circuit and the output control circuit;
the power circuit is used for providing Vbat voltage or VCCL voltage for the injector module; the Vbat end and the VCCL end of the power supply circuit are respectively connected with the input end of the output control circuit;
the output control circuit is used for providing Vbat voltage for the injector module when the injector module is opened and providing VCCL voltage for the injector module in a maintaining period after the injector module is successfully opened; the output end of the output control circuit is connected with the input end of the ejector module;
the voltage detection circuit is used for detecting the output voltage of the power supply circuit, the input end of the voltage detection circuit is connected with the output end of the power supply circuit, and the output end of the voltage detection circuit is connected with the MCU;
the current detection circuit is used for detecting the magnitude of current passing through the injector module; the input end of the current detection circuit is connected with the output end of the ejector module, and the output end of the current detection circuit is connected with the MCU microprocessor.
2. The solenoid valve injector driver circuitry of claim 1, wherein: the Vbat voltage is 10V-32V, and the VCCL voltage is 2V-Vbat.
3. The solenoid valve injector driver circuitry of claim 1, wherein: the input detection circuit comprises a diode D2 for reverse connection prevention isolation protection, a pull-up resistor R4 and a NOT gate IC 1; the collected signal is INPUT from the cathode of the diode D2, the low level is effective, meanwhile, the default level is protected to be the high level through the pull-up resistor R4, the signal is output from the anode of the diode D2, is subjected to current limiting through the current limiting resistor R5, is subjected to shaping through the IC1C end and the IC1D end of the NOT gate IC1, and is sent to the INJ1_ INPUT end of the MCU microprocessor for operation and processing.
4. A solenoid valve injector driver circuit according to claim 3, wherein: the input detection circuit further comprises a filter capacitor C4 for filtering to ensure signal stability, and the filter capacitor C4 is connected between the anode of the diode D2 and the ground terminal.
5. A solenoid valve injector driver circuit according to claim 3, wherein: a voltage regulator tube Z2 is also adopted between the input ends of the current limiting resistor R5 and the NAND gate IC1 for clamping so as to protect the NOT gate chip from overvoltage or overcurrent.
6. The solenoid valve injector driver circuitry of claim 1, wherein: the power supply circuit is a DC-DC voltage reduction circuit and comprises a triode Q9, an MOS tube Q10, a Vbat end and a VCCL end; the base electrode of the triode Q9 is connected with the PWM _ DC end of the MCU microprocessor, the emitter electrode of the triode Q9 is grounded, the collector electrode of the triode Q9 is connected with one input end of the MOS tube Q10, the other input end of the MOS tube Q10 is connected with the Vbat end, and the output end of the MOS tube Q10 is connected with the VCCL end; according to the current required by the injector to maintain the oil injector and the real-time feedback of the acquired voltage at the AD4 end of the MCU microprocessor, the PWM _ DC end of the MCU microprocessor outputs a certain PWM frequency, the triode Q9 is controlled to further control the conduction of the MOS transistor Q10, and the output voltage VCCL at the VCCL end is controlled.
7. The solenoid valve injector driver circuitry of claim 6, wherein: an inductor L4 and a capacitor C41 for energy storage are also connected between the MOS tube Q10 and the VCCL end; a regulator D17 for freewheeling is connected between the MOS transistor Q10 and the inductor L4.
8. The solenoid valve injector driver circuitry of claim 6, wherein: the output control circuit is a dual-voltage control circuit and comprises an INJ0_ H input end, an INJ0_ L input end, an MOS tube Q1, an MOS tube Q3 and a diode D7, wherein the INJ0_ H input end and the INJ0_ L input end are respectively connected with the output end of the MCU microprocessor, the INJ0_ H input end is connected with one input end of the MOS tube Q1, and the other input end of the MOS tube Q1 is connected with the Vbat end of the power supply circuit; the output end of the MOS tube Q1 is connected with the input end of the ejector module; the input end of the INJ0_ L is connected with one input end of the MOS tube Q3, and the output end of the MOS tube Q3 is connected with the input end of the ejector module; the anode of the diode D7 is connected with the VCCL terminal, and the cathode of the diode D7 is connected with the input terminal of the ejector module; when the ejector is opened, the input end of INJ0_ H firstly inputs high level to simultaneously open the MOS tube Q1 and the MOS tube Q3, at the moment, the voltage of the Vbat end is higher than that of the VCCL end, the diode D7 is not conducted in the reverse direction, the VCCL voltage cannot pass through the ejector coil, and the Vbat voltage ensures that the ejector is quickly opened through the ejector coil; when the injector is opened, the input end of the INJ0_ H inputs low level to the MOS tube Q1, the MOS tube Q1 is turned off, VCCL voltage passes through the coil of the injector, and the current passing through the coil of the injector maintains the suction of the valve core; when the injector needs to be closed, the INJ0_ L input end inputs a low level to the MOS transistor Q3, and then the injector is closed.
9. The solenoid valve injector driver circuitry of claim 6, wherein: the voltage detection circuit is a voltage division circuit comprising a resistor R47, a resistor R3 and a capacitor C37, one end of the resistor R47 is connected with the VCCL end of the power circuit, and the other end of the resistor R47 is connected with a resistor R3 in series and then is connected with the ground end; the AD4 end of the MCU microprocessor is connected in parallel to the resistor R47, the input end of the AD4 end of the MCU microprocessor is also connected in series with the capacitor C37, and the capacitor C37 plays a role in filtering, so that a current signal entering the AD4 end of the MCU microprocessor is stable, reliable and free of interference.
10. The solenoid valve injector driver circuitry of claim 8, wherein: the current detection circuit is a current sampling circuit comprising a resistor R37 and a capacitor C15, the resistor R37 is a high-precision sampling resistor, one end of the resistor R37 is connected with an MOS transistor Q3, and the other end of the resistor R37 is grounded; the AD0 end of the MCU microprocessor is connected between the MOS transistor Q3 and the resistor R37, the input end of the AD0 end of the MCU microprocessor is also connected with the capacitor C15, and the capacitor C15 is used for filtering, so that the current signal entering the AD0 end of the MCU microprocessor is stable, reliable and free of interference.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920825819.XU CN210889171U (en) | 2019-06-03 | 2019-06-03 | Solenoid valve type injector drive circuit system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920825819.XU CN210889171U (en) | 2019-06-03 | 2019-06-03 | Solenoid valve type injector drive circuit system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219758A (en) * | 2019-06-03 | 2019-09-10 | 柳州源创电喷技术有限公司 | Electromagnetic type injector drive circuit system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110219758A (en) * | 2019-06-03 | 2019-09-10 | 柳州源创电喷技术有限公司 | Electromagnetic type injector drive circuit system |
| CN110219758B (en) * | 2019-06-03 | 2024-01-23 | 柳州源创电喷技术有限公司 | Solenoid valve type injector drive circuit system |
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