A fuel injection controller, control method and system

Abstract

The application discloses an oil injection controller, a control method and a system, which comprise a driving unit, a switch unit, a timeout comparison unit and a timeout control unit. The driving unit is used for receiving a driving signal and providing an opening signal under the control of a first driving sub-signal and stopping providing the opening signal under the control of a second driving sub-signal. The switch unit is used for opening an oil injector when the opening signal is received. The timeout comparison unit is used for receiving the driving signal and converting the driving signal into an integral voltage. When the integral voltage is greater than a preset voltage, a timeout control signal is output. The timeout control unit is used for switching the first driving sub-signal into the second driving sub-signal under the control of the timeout control signal. That is, when the length of time that the driving signal is at a valid level exceeds a preset length of time, the timeout control signal is output by the timeout comparison unit to control the timeout control unit, so that the oil injector is turned off, thereby realizing the control of the oil injection duration by the oil injection controller and improving the accuracy of the control of the oil injection duration.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic circuit, in particular to a fuel injection controller, a control method and a system. BACKGROUND

[0002] With the continuous development of automobile electronic technology, the controller pays attention to the control of the fuel injection duration of the fuel injector. In actual application, the fuel injector is controlled through the driving signal of the controller. When the abnormal situation that the duration of the driving signal being the effective level exceeds the preset duration occurs, the fuel injection duration of the fuel injector will be overtime, which will cause the fuel injector to burn out.

[0003] In order to avoid the above problems, in the prior art, when the controller controls the fuel injector to start fuel injection, the timer in the controller starts timing. After the timer reaches the preset duration, the controller controls the fuel injector to stop fuel injection. However, when the timer is abnormal and cannot normally time, the fuel injection duration will be overtime, and the control of the fuel injection duration cannot be realized. SUMMARY

[0004] The present application provides a fuel injection controller, a control method and a system to solve the problem that the control of the fuel injection duration cannot be realized in the prior art.

[0005] In a first aspect, the present application provides a fuel injection controller, comprising: a driving unit, an on-off unit, a timeout comparison unit and a timeout control unit;

[0006] The driving unit is configured to receive a driving signal, and under the control of a first driving sub-signal, provide an opening signal to the on-off unit, and under the control of a second driving sub-signal, stop providing the opening signal to the on-off unit, wherein the first driving sub-signal represents the effective level of the driving signal, and the second driving sub-signal represents the invalid level of the driving signal.

[0007] The on-off unit is configured to, when receiving the opening signal, turn on the path between the ground end and the ground end of the fuel injector to turn on the fuel injector.

[0008] The timeout comparison unit is configured to receive the driving signal and convert the effective level of the driving signal into an integral voltage. When the integral voltage is greater than a preset voltage, a timeout control signal is output.

[0009] The timeout control unit is configured to receive the timeout control signal and switch the first driving sub-signal to the second driving sub-signal under the control of the timeout control signal.

[0010] In a possible implementation, the driving unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first NPN transistor and a first PNP transistor.

[0011] A first end of the first resistor is configured to receive the driving signal, a second end of the first resistor is configured to output the first driving sub-signal or the second driving sub-signal, and the second end of the first resistor is electrically connected to a first end of the second resistor and the timeout control unit;

[0012] A second end of the second resistor is electrically connected to a first end of the third resistor and a base of the first NPN transistor;

[0013] A second end of the third resistor is electrically connected to an emitter of the first NPN transistor and a ground terminal;

[0014] A collector of the first NPN transistor is electrically connected to a first end of the fourth resistor;

[0015] A second end of the fourth resistor is electrically connected to a first end of the fifth resistor and a base of the first PNP transistor;

[0016] A second end of the fifth resistor is configured to receive a first power voltage, and the second end of the fifth resistor is electrically connected to an emitter of the first PNP transistor;

[0017] A collector of the first PNP transistor is electrically connected to a first end of the sixth resistor;

[0018] A second end of the sixth resistor is configured to output the start signal.

[0019] In a possible implementation, the on-off unit comprises a switch tube, a seventh resistor and an eighth resistor.

[0020] A control terminal of the switch tube is electrically connected to a first end of the seventh resistor, and configured to receive the start signal;

[0021] A first end of the switch tube is electrically connected to a second end of the seventh resistor and a first end of the eighth resistor;

[0022] A second end of the switch tube is electrically connected to a ground terminal of the oil injector;

[0023] A second end of the eighth resistor is electrically connected to the ground terminal.

[0024] In a possible implementation, the timeout comparison unit comprises an RC integration module and a comparison module.

[0025] The RC integration module is configured to receive the driving signal and convert an effective level of the driving signal into an integration voltage.

[0026] The comparison module is configured to receive the integration voltage and output a timeout control signal when the integration voltage is greater than a preset voltage.

[0027] In a possible implementation, the RC integration module comprises a ninth resistor, a tenth resistor, a first diode and a first capacitor.

[0028] A first end of the ninth resistor is electrically connected to a cathode of the first diode, configured to receive the driving signal; a second end of the ninth resistor is electrically connected to a first end of the first capacitor and a first end of the tenth resistor, configured to output the integration voltage.

[0029] A second end of the first capacitor is electrically connected to the ground end.

[0030] A second end of the tenth resistor is electrically connected to an anode of the first diode.

[0031] The comparison module comprises a comparator.

[0032] A positive input end of the comparator is configured to receive the integration voltage; an inverting input end of the comparator is configured to receive the preset voltage; a first power supply end of the comparator is electrically connected to the ground end; a second power supply end of the comparator is configured to receive a second power supply voltage; and an output end of the comparator is configured to output the timeout control signal.

[0033] In a possible implementation, the timeout control unit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a second PNP transistor, a third PNP transistor and a second diode.

[0034] A first end of the eleventh resistor is configured to receive the timeout control signal; a second end of the eleventh resistor is electrically connected to a first end of the twelfth resistor, a first end of the thirteenth resistor and a base of the second PNP transistor.

[0035] A second end of the twelfth resistor is electrically connected to an emitter of the second PNP transistor and the ground end.

[0036] A second end of the thirteenth resistor is electrically connected to a collector of the third PNP transistor.

[0037] The emitter of the third PNP triode is configured to receive the second power supply voltage, and the emitter of the third PNP triode is electrically connected with the first end of the fourteenth resistor; the base of the third PNP triode is electrically connected with the second end of the fourteenth resistor and the first end of the fifteenth resistor;

[0038] The second end of the fifteenth resistor is electrically connected with the cathode of the second diode and the collector of the second PNP triode;

[0039] The anode of the second diode is electrically connected with the driving unit

[0040] In a possible implementation, the reset unit further comprises a timeout control reset unit.

[0041] The timeout control reset unit is configured to receive the driving signal, and when the driving signal is an invalid level, turn on a path between the timeout control unit and the ground end to turn off the timeout control unit.

[0042] In a possible implementation, the timeout control reset unit comprises a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a fourth PNP triode and a second NPN triode.

[0043] The first end of the sixteenth resistor is configured to receive the driving signal, and the second end of the sixteenth resistor is electrically connected with the base of the fourth PNP triode;

[0044] The emitter of the fourth PNP triode is configured to receive the second power supply voltage, and the collector of the fourth PNP triode is electrically connected with the first end of the seventeenth resistor;

[0045] The second end of the seventeenth resistor is electrically connected with the first end of the eighteenth resistor and the base of the second NPN triode;

[0046] The second end of the eighteenth resistor is electrically connected with the ground end and the emitter of the second NPN triode;

[0047] The collector of the second NPN triode is electrically connected with the timeout control unit.

[0048] In a second aspect, the application provides an oil injection control method, applied to the oil injection controller of the first aspect, and the method comprises:

[0049] The driving unit receives a driving signal and provides an opening signal to the on-off unit under control of a first driving sub-signal and stops providing the opening signal to the on-off unit under control of a second driving sub-signal, wherein the first driving sub-signal represents an effective level of the driving signal, and the second driving sub-signal represents an ineffective level of the driving signal.

[0050] The on-off unit turns on a path between the ground end and the ground end of the oil injector to open the oil injector when the opening signal is received.

[0051] The timeout comparison unit receives the driving signal and converts the effective level of the driving signal into an integral voltage, and outputs a timeout control signal when the integral voltage is greater than a preset voltage.

[0052] The timeout control unit receives the timeout control signal and switches the first driving sub-signal to the second driving sub-signal under control of the timeout control signal.

[0053] In a third aspect, the application provides an oil injection control system including the oil injection controller according to the first aspect and an oil injector connected to the oil injection controller.

[0054] The application has the following advantages:

[0055] The application provides an oil injection controller, control method and system. The oil injection controller includes a driving unit, an on-off unit, a timeout comparison unit and a timeout control unit. The driving unit receives a driving signal and provides an opening signal to the on-off unit under control of a first driving sub-signal and stops providing the opening signal to the on-off unit under control of a second driving sub-signal, wherein the first driving sub-signal represents an effective level of the driving signal, and the second driving sub-signal represents an ineffective level of the driving signal. The on-off unit turns on a path between the ground end and the ground end of the oil injector to open the oil injector when the opening signal is received. The timeout comparison unit receives the driving signal and converts the effective level of the driving signal into an integral voltage, and outputs a timeout control signal when the integral voltage is greater than a preset voltage. The timeout control unit receives the timeout control signal and switches the first driving sub-signal to the second driving sub-signal under control of the timeout control signal. That is, the application does not rely on a timer to control the oil injection duration, but converts the effective level of the driving signal into an integral signal through the timeout comparison unit. When the duration of the effective level of the driving signal exceeds a preset duration, the timeout comparison unit outputs a timeout control signal to control the timeout control unit, switches the first driving sub-signal to the second driving sub-signal, stops the driving unit from providing the opening signal to the on-off unit, and then turns off the oil injector, thereby realizing control of the oil injection duration by the oil injection controller and improving the accuracy of the control of the oil injection duration. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0057] Figure 1 A schematic diagram of a fuel injection control system provided by the prior art;

[0058] Figure 2 A schematic diagram of the structure of a fuel injection controller provided in an embodiment of the present application;

[0059] Figure 3 A circuit diagram of a fuel injection controller provided in an embodiment of the present application;

[0060] Figure 4 A circuit diagram of another fuel injection controller provided in an embodiment of the present application;

[0061] Figure 5 A circuit diagram of another fuel injection controller provided in an embodiment of the present application;

[0062] Figure 6 A circuit diagram of another fuel injection controller provided in an embodiment of the present application;

[0063] Figure 7 A circuit diagram of another fuel injection controller provided in an embodiment of the present application;

[0064] Figure 8 A circuit diagram of another fuel injection controller provided in an embodiment of the present application;

[0065] Figure 9 A simulation waveform diagram of a fuel injection controller provided in an embodiment of the present application;

[0066] Figure 10 A flow chart of a fuel injection control method provided in an embodiment of the present application;

[0067] Figure 11 A schematic diagram of a fuel injection control system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0068] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0069] With the continuous development of automobile electronic technology, the controller pays attention to the control of the fuel injection duration of the fuel injector. In actual application, the fuel injector is controlled through the driving signal of the controller. When the duration of the driving signal being the effective level exceeds the preset duration, the fuel injection duration of the fuel injector is overtime, which further causes the fuel injector to burn out. In order to avoid the above problems, the prior art provides a schematic diagram of a fuel injection control system as shown in Figure 1 When the controller 101 controls the fuel injector 103 to start fuel injection, the timer 102 in the controller 101 starts timing. When the timer 102 reaches the preset duration, the controller 101 controls the fuel injector 102 to stop fuel injection. However, when the timer 102 is abnormal and cannot normally time, the fuel injection duration is overtime, and the control of the fuel injection duration cannot be realized.

[0070] Based on the above problems, the present application provides a fuel injection controller. As shown in Figure 2 The fuel injection controller provided by the present application includes a driving unit 201, an on-off unit 202, an overtime comparison unit 203 and an overtime control unit 204.

[0071] The driving unit 201 is configured to receive a driving signal, and under the control of a first driving sub-signal, provide an opening signal to the on-off unit 202, and under the control of a second driving sub-signal, stop providing the opening signal to the on-off unit 202, wherein the first driving sub-signal represents an effective level of the driving signal, and the second driving sub-signal represents an ineffective level of the driving signal.

[0072] The on-off unit 202 is configured to, when receiving the opening signal, turn on a path between a ground end and a ground end of the fuel injector, so as to open the fuel injector.

[0073] The overtime comparison unit 203 is configured to receive the driving signal, and convert the effective level of the driving signal into an integral voltage. When the integral voltage is greater than a preset voltage, an overtime control signal is output.

[0074] The overtime control unit 204 is configured to receive the overtime control signal, and under the control of the overtime control signal, switch the first driving sub-signal to the second driving sub-signal.

[0075] In the embodiment, the fuel injection controller comprises a driving unit 201, an on-off unit 202, a timeout comparison unit 203, and a timeout control unit 204. The driving unit 201 is configured to receive a driving signal, and provide an on signal to the on-off unit 202 under the control of a first driving sub-signal, and stop providing the on signal to the on-off unit 202 under the control of a second driving sub-signal. The first driving sub-signal represents an active level of the driving signal, and the second driving sub-signal represents an inactive level of the driving signal. The on-off unit 202 is configured to turn on a path between a ground end and a ground end of the fuel injector to turn on the fuel injector when the on signal is received. The timeout comparison unit 203 is configured to receive the driving signal, and convert the active level of the driving signal into an integral voltage. When the integral voltage is greater than a preset voltage, the timeout comparison unit 203 outputs a timeout control signal. The timeout control unit 204 is configured to receive the timeout control signal, and switch the first driving sub-signal to the second driving sub-signal under the control of the timeout control signal. That is, the fuel injection controller does not rely on a timer to control the fuel injection duration, but converts the active level of the driving signal into an integral signal through the timeout comparison unit 203. When the duration of the active level of the driving signal exceeds a preset duration, the timeout comparison unit 203 outputs a timeout control signal to control the timeout control unit 204, and switches the first driving sub-signal to the second driving sub-signal, so that the driving unit 201 stops providing the on signal to the on-off unit 202, and the fuel injector is turned off. Thus, the fuel injection controller controls the fuel injection duration, and improves the accuracy of the control of the fuel injection duration.

[0076] It should be noted that the active level of the driving signal can be a high level, and the inactive level of the driving signal can be a low level.

[0077] In an embodiment, as shown in FIG. 2, a circuit schematic diagram of a fuel injection controller is provided. The driving unit 201 comprises a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first NPN transistor NPN_1, and a first PNP transistor PNP_1. Figure 3 The first end of the first resistor R1 is configured to receive the driving signal, the second end of the first resistor R1 is configured to output the first driving sub-signal or the second driving sub-signal, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2 and the timeout control unit 204.

[0078] The second end of the second resistor R2 is electrically connected to the first end of the third resistor R3 and the base of the first NPN transistor NPN_1.

[0079] The second end of the second resistor R2 is electrically connected to the first end of the third resistor R3 and the base of the first NPN transistor NPN_1.

[0080] The second end of the third resistor R3 is electrically connected with the emitter of the first NPN transistor NPN_1 and the ground terminal;

[0081] The collector of the first NPN transistor NPN_1 is electrically connected with the first end of the fourth resistor R4;

[0082] The second end of the fourth resistor R4 is electrically connected with the first end of the fifth resistor R5 and the base of the first PNP transistor PNP_1;

[0083] The second end of the fifth resistor R5 is used for receiving the first power voltage, and the second end of the fifth resistor R5 is electrically connected with the emitter of the first PNP transistor PNP_1;

[0084] The collector of the first PNP transistor PNP_1 is electrically connected with the first end of the sixth resistor R6;

[0085] The second end of the sixth resistor R6 is used for outputting the start signal.

[0086] It should be noted that the voltage value of the first power voltage V1 can be 24V.

[0087] As shown in Figure 3 The on-off unit 202 includes a switch tube M1, a seventh resistor R7 and an eighth resistor R8;

[0088] The control terminal of the switch tube M1 is electrically connected with the first end of the seventh resistor R7, and is used for receiving the start signal;

[0089] The first end of the switch tube M1 is electrically connected with the second end of the seventh resistor R7 and the first end of the eighth resistor R8;

[0090] The second end of the switch tube M1 is electrically connected with the ground terminal of the oil injector;

[0091] The second end of the eighth resistor is electrically connected with the ground terminal.

[0092] The switch tube M1 can be an NMOS tube, the first end of the switch tube M1 is the drain of the NMOS tube, and the second end of the switch tube M1 is the source of the NMOS tube.

[0093] In specific embodiments, the driving unit 201 is used for receiving a driving signal, when receiving a first driving sub-signal representing that the driving signal is a valid level, turning on the first NPN transistor NPN_1 through the first driving sub-signal, making the first NPN transistor NPN_1 and the ground terminal communicate, and turning on the first PNP transistor PNP_1 through the first power voltage V1, and the driving unit 201 outputs the start signal. When receiving the start signal, the timeout comparison unit 202 turns on the path between the ground terminal and the ground terminal of the oil injector, and starts the oil injector.

[0094] When the driving unit 201 receives the second driving sub-signal representing that the driving signal is invalid, since the second driving sub-signal cannot turn on the first NPN transistor NPN_1 and the first PNP transistor PNP_1, the driving unit 201 stops providing the opening signal to the on-off unit 202, and further makes the oil injector turn off.

[0095] In an embodiment, as shown in FIG. 4, a circuit schematic diagram of another oil injection controller provided by the present application is provided, the timeout comparison unit 203 includes an RC integration module 401 and a comparison module 402. Figure 4

[0096] The RC integration module 401 is configured to receive the driving signal and convert the valid level of the driving signal into an integrated voltage V3; and the comparison module 402 is configured to receive the integrated voltage V3 and output a timeout control signal when the integrated voltage V3 is greater than a preset voltage V4.

[0097] Specifically, as shown in FIG. 5, a circuit schematic diagram of another oil injection controller provided by the present application is provided, the RC integration module 401 includes a ninth resistor R9, a tenth resistor R10, a first diode D1 and a first capacitor C1. Figure 5

[0098] The first end of the ninth resistor R9 is electrically connected with the cathode of the first diode D1, configured to receive the driving signal; the second end of the ninth resistor R9 is electrically connected with the first end of the first capacitor C1 and the first end of the tenth resistor R10, configured to output the integrated voltage V3.

[0099] The second end of the first capacitor C1 is electrically connected with the ground terminal.

[0100] The second end of the tenth resistor R10 is electrically connected with the anode of the first diode D1.

[0101] The comparison module 402 includes a comparator 501; the non-inverting input end of the comparator 501 is configured to receive the integrated voltage V3; the inverting input end of the comparator 501 is configured to receive the preset voltage V4; the first power supply end of the comparator 501 is electrically connected with the ground terminal; the second power supply end of the comparator 501 is configured to receive a second power supply voltage V2; and the output end of the comparator 501 is configured to output the timeout control signal.

[0102] The voltage value of the preset voltage V4 can be 2V.

[0103] ​​In a specific embodiment, the timeout comparison unit 203 is configured to receive the driving signal and convert the active level of the driving signal into an integral voltage V3 through the RC integration module 401. When the duration of the active level of the driving signal received by the timeout comparison unit 203 is less than or equal to a preset duration, the integral voltage V3 is less than a preset voltage V4, it is determined that the duration of the active level of the driving signal is normal, and the level of the output end of the comparator is a low level. When the duration of the active level of the driving signal received by the timeout comparison unit 203 is greater than the preset duration, the integral voltage V3 is greater than the preset voltage V4, it is determined that the duration of the active level of the driving signal is abnormal, and the output end of the comparator outputs a high-level timeout control signal.

[0104] In an embodiment, as shown in FIG. 4, another circuit schematic diagram of the fuel injection controller provided by the present application is provided, and the timeout control unit 204 includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a second PNP transistor PNP_2, a third PNP transistor PNP_3, and a second diode D3. Figure 6

[0105] The first end of the eleventh resistor R11 is configured to receive the timeout control signal, and the second end of the eleventh resistor R11 is electrically connected to the first end of the twelfth resistor R12, the first end of the thirteenth resistor R13, and the base of the second PNP transistor PNP_2.

[0106] The second end of the twelfth resistor R12 is electrically connected to the emitter of the second PNP transistor PNP_2 and the ground end.

[0107] The second end of the thirteenth resistor R13 is electrically connected to the collector of the third PNP transistor PNP_3.

[0108] The emitter of the third PNP transistor PNP_3 is configured to receive the second power voltage V2, and the emitter of the third PNP transistor PNP_3 is electrically connected to the first end of the fourteenth resistor R14. The base of the third PNP transistor PNP_3 is electrically connected to the second end of the fourteenth resistor R14 and the first end of the fifteenth resistor R15.

[0109] The second end of the fifteenth resistor R15 is electrically connected to the cathode of the second diode D2 and the collector of the second PNP transistor PNP_2.

[0110] The anode of the second diode D2 is electrically connected to the driving unit 201.

[0111] ​In a specific embodiment, when the timeout control unit 204 receives the high-level timeout control signal output by the timeout comparison unit 203, it is determined that the duration of the driving signal at the active level is abnormal. The high-level timeout control signal is divided by the eleventh resistor R11 and the twelfth resistor R12, which turns on the second PNP transistor PNP_2. The second PNP transistor PNP_2 pulls the level of the first driving sub-signal low through the second diode D2, i.e., switches the first driving sub-signal of the driving unit 201 to the second driving sub-signal. The second driving sub-signal cannot turn on the first NPN transistor NPN_1 and the first PNP transistor PNP_1, and the driving unit 201 stops providing the on signal to the on-off unit 202, thereby causing the oil injector to turn off, thereby realizing the control of the oil injection duration by the oil injection controller.

[0112] After the second PNP transistor PNP_2 is turned on, the second power supply voltage V2 is divided by the fourteenth resistor R14 and the fifteenth resistor R15, which turns on the third PNP transistor PNP_3. Through the cyclic self-locking of the third PNP transistor PNP_3 and the second PNP transistor PNP_2, it is ensured that the first NPN transistor NPN_1 and the first PNP transistor PNP_1 cannot receive the first driving signal, and the on-off unit cannot receive the on signal, thereby ensuring the control of the oil injection duration by the oil injection controller.

[0113] In an embodiment, as shown in Figure 7 FIG. 6 is a circuit schematic diagram of another oil injection controller provided by an embodiment of the present application, which further comprises a timeout control reset unit 701.

[0114] The timeout control reset unit 701 is configured to receive the driving signal and turn on a path between the timeout control unit 204 and the ground end when the driving signal is at the inactive level, so as to turn off the timeout control unit 204.

[0115] Specifically, as shown in Figure 8 FIG. 6 is a circuit schematic diagram of another oil injection controller provided by an embodiment of the present application, the timeout control reset unit 701 comprises a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a fourth PNP transistor PNP_4 and a second NPN transistor NPN_2.

[0116] A first end of the sixteenth resistor R16 is configured to receive the driving signal, and a second end of the sixteenth resistor R16 is electrically connected to a base of the fourth PNP transistor PNP_4.

[0117] An emitter of the fourth PNP transistor PNP_4 is configured to receive the second power supply voltage V2, and a collector of the fourth PNP transistor PNP_4 is electrically connected to a first end of the seventeenth resistor R17.

[0118] A second end of the seventeenth resistor R17 is electrically connected to a first end of the eighteenth resistor R18 and a base of the second NPN transistor NPN_2;

[0119] A second end of the eighteenth resistor R18 is electrically connected to the ground end and the emitter of the second NPN transistor NPN_2;

[0120] The collector of the second NPN transistor NPN_2 is electrically connected to the timeout control unit.

[0121] In a specific embodiment, the timeout control reset unit 701 is configured to receive a drive signal. When the received drive signal is at an inactive level, the abnormal condition indicating that the duration of the drive signal being at an active level exceeds a preset duration is resolved. The timeout control reset unit 701 receives a low-level drive signal via the sixteenth resistor R17, turning on the fourth PNP transistor PNP_4. The second power supply voltage V2 is divided by the seventeenth resistor R17 and the eighteenth resistor R18, turning on the second NPN transistor NPN_2. After the second NPN transistor NPN_2 is turned on, since the collector of the second NPN transistor NPN_2 is electrically connected to the base of the second PNP transistor PNP_2, the second NPN transistor NPN_2 pulls the voltage of the base of the second PNP transistor PNP_2 down to 0, turning off the second PNP transistor PNP_2 and thereby shutting down the timeout control unit 204. The cyclic self-locking of the third PNP transistor PNP_3 and the second PNP transistor PNP_2 in the timeout control unit 204 is released, and when the first NPN transistor NPN_1 and the first PNP transistor PNP_1 receive the first driving signal again, they are turned on, thereby enabling the injection controller to control the injection duration.

[0122] In one embodiment, if Figure 9 The figure shows a simulation waveform diagram of an injection controller provided by an embodiment of the present application. From top to bottom, it shows the drive signal, the timeout control signal, and the injector operating state. The high level of the drive signal is the active level of the drive signal, and the low level of the drive signal is the inactive level of the drive signal. The high level of the timeout control signal is the active level of the timeout control signal, and the low level of the timeout control signal is the inactive level of the timeout control signal. The high level of the injector operating state indicates that the injector is in the on state, and the low level of the injector operating state indicates that the injector is in the off state.

[0123] When the duration of the active level of the driving signal received by the driving unit 201 is less than or equal to the preset duration, the driving unit 201 provides an on-off signal to the on-off unit 202, causing the on-off unit 202 to turn on the injector. When the duration of the active level of the driving signal received by the driving unit 201 is greater than the preset duration, the timeout comparison unit 203 provides a high-level timeout control signal to the timeout control unit 204. Under the control of the timeout control signal, the timeout control unit 204 switches the first driving sub-signal to the second driving sub-signal, causing the injector to enter the off state. When the driving unit 201 receives a driving signal at an inactive level, indicating that the abnormal condition of the driving signal being at an active level for a duration exceeding the preset duration has been resolved, the timeout comparison unit 203 no longer provides a high-level timeout control signal to the timeout control unit 204.

[0124] The present application provides an injection controller, which includes: a drive unit, an on-off unit, a timeout comparison unit and a timeout control unit; the drive unit is used to receive a drive signal and, under the control of a first drive sub-signal, provide an on signal to the on-off unit, and, under the control of a second drive sub-signal, stop providing the on signal to the on-off unit, wherein the first drive sub-signal represents an effective level of the drive signal and the second drive sub-signal represents an ineffective level of the drive signal; the on-off unit is used to, upon receiving the on signal, conduct a path between the ground terminal and the ground terminal of the injector to turn on the injector; the timeout comparison unit is used to receive the drive signal and convert the effective level of the drive signal into an integrated voltage, and output a timeout control signal when the integrated voltage is greater than a preset voltage; the timeout control unit is used to receive the timeout control signal and, under the control of the timeout control signal, switch the first drive sub-signal to the second drive sub-signal. That is to say, the present application does not rely on a timer to control the duration of injection, but converts the effective level of the drive signal into an integral signal through a timeout comparison unit. When the duration of the drive signal being at an effective level exceeds a preset duration, the timeout comparison unit outputs a timeout control signal to control the timeout control unit, switches the first drive sub-signal to the second drive sub-signal, causes the drive unit to stop providing an on-off signal to the on-off unit, and thereby turns off the injector, thereby enabling the injection controller to control the duration of injection and improving the accuracy of the control of the duration of injection.

[0125] Based on the same disclosed concept, the fuel injection controller described above in this application can also be implemented by a fuel injection control method. The effect of the fuel injection control method is similar to that of the aforementioned fuel injection controller, and will not be described in detail here.

[0126] like Figure 10 FIG. 1 is a flow chart of a fuel injection control method provided in an embodiment of the present application, and the steps are as follows:

[0127] S1001, receiving, by the driving unit, the driving signal, and providing, under control of a first driving sub-signal, the opening signal to the on-off unit, and stopping providing, under control of a second driving sub-signal, the opening signal to the on-off unit, wherein the first driving sub-signal represents an effective level of the driving signal, and the second driving sub-signal represents an ineffective level of the driving signal;

[0128] S1002, conducting, by the on-off unit, a path between the ground end and the ground end of the oil injector when the opening signal is received, to open the oil injector;

[0129] S1003, receiving, by the timeout comparison unit, the driving signal, and converting the effective level of the driving signal into an integral voltage, and outputting a timeout control signal when the integral voltage is greater than a preset voltage;

[0130] S1004, receiving, by the timeout control unit, the timeout control signal, and switching the first driving sub-signal to the second driving sub-signal under control of the timeout control signal.

[0131] The oil injection controller and control method provided by the present application include a driving unit, an on-off unit, a timeout comparison unit, and a timeout control unit. The driving unit is configured to receive a driving signal, and provide an opening signal to the on-off unit under control of a first driving sub-signal, and stop providing the opening signal to the on-off unit under control of a second driving sub-signal, wherein the first driving sub-signal represents an effective level of the driving signal, and the second driving sub-signal represents an ineffective level of the driving signal. The on-off unit is configured to conduct a path between a ground end and a ground end of an oil injector when the opening signal is received, to open the oil injector. The timeout comparison unit is configured to receive the driving signal, and convert the effective level of the driving signal into an integral voltage, and output a timeout control signal when the integral voltage is greater than a preset voltage. The timeout control unit is configured to receive the timeout control signal, and switch the first driving sub-signal to the second driving sub-signal under control of the timeout control signal. That is, the present application does not rely on a timer to control the duration of oil injection, but converts the effective level of the driving signal into an integral signal through the timeout comparison unit. When the duration of the effective level of the driving signal exceeds a preset duration, the timeout comparison unit outputs a timeout control signal to control the timeout control unit, switches the first driving sub-signal to the second driving sub-signal, stops the driving unit from providing the opening signal to the on-off unit, and further stops the oil injector, thereby realizing control of the duration of oil injection by the controller, and improving the accuracy of control of the duration of oil injection.

[0132] Based on the same disclosed concept, the oil injection controller and control method described above can also be implemented by an oil injection control system. The oil injection control system has similar effects to the aforementioned oil injection controller and control method, and will not be described here again.

[0133] As Figure 11 shown, a structure schematic diagram of an oil injection control system provided by an embodiment of the present application, comprising an oil injection controller 1101 and an oil injector 1102 connected with the oil injection controller.

[0134] The oil injection controller 1101 comprises a driving unit, an on-off unit, a timeout comparison unit, a timeout control unit and a timeout control reset unit.

[0135] The present application provides an oil injection controller, a control method and a system. The oil injection controller comprises a driving unit, an on-off unit, a timeout comparison unit and a timeout control unit. The driving unit is configured to receive a driving signal, and provide an on signal to the on-off unit under the control of a first driving sub-signal, and stop providing the on signal to the on-off unit under the control of a second driving sub-signal, wherein the first driving sub-signal represents an effective level of the driving signal, and the second driving sub-signal represents an ineffective level of the driving signal. The on-off unit is configured to turn on a path between a ground end and a ground end of the oil injector to turn on the oil injector when the on signal is received. The timeout comparison unit is configured to receive the driving signal, and convert the effective level of the driving signal into an integral voltage, and output a timeout control signal when the integral voltage is greater than a preset voltage. The timeout control unit is configured to receive the timeout control signal, and switch the first driving sub-signal to the second driving sub-signal under the control of the timeout control signal. That is, the present application does not rely on a timer to control the oil injection duration, but converts the effective level of the driving signal into an integral signal through the timeout comparison unit. When the duration of the effective level of the driving signal exceeds a preset duration, the timeout comparison unit outputs a timeout control signal to control the timeout control unit, and switches the first driving sub-signal to the second driving sub-signal, so that the driving unit stops providing the on signal to the on-off unit, and then the oil injector is turned off, thereby realizing the control of the oil injection duration by the controller, and improving the accuracy of the control of the oil injection duration.

[0136] The present application is described above with reference to flowchart and / or block diagrams of the method, device (system) and / or computer program product according to embodiments of the present application. It should be understood that one block of the flowchart and / or block diagram and a combination of blocks of the flowchart and / or block diagram can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, and / or other programmable data processing apparatus to produce a machine, so that the instructions executed by the computer processor and / or other programmable data processing apparatus create a method for implementing the functions / acts specified in the blocks of the flowchart and / or block diagram.

[0137] Accordingly, the present application can be embodied in hardware and / or in software (including firmware, resident software, micro-code, etc.) Furthermore, the present application can take the form of a computer program product on a computer-usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system. In the context of this application, a computer-usable or computer-readable medium can be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.

[0138] Obviously, numerous modifications and variations of the present application are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims and their equivalents, the application can be practiced otherwise than as specifically described.

Claims

1. An oil injection controller characterized by comprising: The application relates to a driving unit, an on-off unit, a timeout comparison unit and a timeout control unit. The driving unit is used for receiving a driving signal, and under the control of a first driving sub-signal, providing an opening signal to the on-off unit, and under the control of a second driving sub-signal, stopping the provision of the opening signal to the on-off unit, wherein the first driving sub-signal represents an effective level of the driving signal, and the second driving sub-signal represents an ineffective level of the driving signal. The on-off unit is used for turning on a path between a ground end and a ground end of an oil injector when the opening signal is received, so as to open the oil injector. The timeout comparison unit is used for receiving the driving signal, converting the effective level of the driving signal into an integral voltage, and outputting a timeout control signal when the integral voltage is greater than a preset voltage. The timeout control unit is used for receiving the timeout control signal, and under the control of the timeout control signal, switching the first driving sub-signal into the second driving sub-signal. The timeout control unit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a second PNP transistor, a third PNP transistor and a second diode. A first end of the eleventh resistor is used for receiving the timeout control signal, and a second end of the eleventh resistor is electrically connected with a first end of the twelfth resistor, a first end of the thirteenth resistor and a base of the second PNP transistor. A second end of the twelfth resistor is electrically connected with an emitter of the second PNP transistor and the ground end. A second end of the thirteenth resistor is electrically connected with a collector of the third PNP transistor. An emitter of the third PNP transistor is used for receiving a second power voltage, and the emitter of the third PNP transistor is electrically connected with a first end of the fourteenth resistor, a base of the third PNP transistor is electrically connected with a second end of the fourteenth resistor and a first end of the fifteenth resistor. A second end of the fifteenth resistor is electrically connected with a cathode of the second diode and a collector of the second PNP transistor. An anode of the second diode is electrically connected with the driving unit. The driving unit comprises a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first NPN transistor and a first PNP transistor.

2. The fuel injection controller of claim 1 wherein, A first end of the first resistor is used for receiving the driving signal, a second end of the first resistor is used for outputting the first driving sub-signal or the second driving sub-signal, and the second end of the first resistor is electrically connected with a first end of the second resistor and the timeout control unit. A second end of the second resistor is electrically connected with a first end of the third resistor and a base of the first NPN transistor. A second end of the third resistor is electrically connected with an emitter of the first NPN transistor and a ground end. A collector of the first NPN transistor is electrically connected with a first end of the fourth resistor. A second end of the fourth resistor is electrically connected with a first end of the fifth resistor and a base of the first PNP transistor. A second end of the fifth resistor is electrically connected with a first end of the sixth resistor and a base of the first PNP transistor. A second end of the sixth resistor is electrically connected with a collector of the first PNP transistor and a ground end. A second end of the fifth resistor is configured to receive a first power voltage, and the second end of the fifth resistor is electrically connected with the emitter of the first PNP transistor; The collector of the first PNP transistor is electrically connected with a first end of the sixth resistor; The second end of the sixth resistor is configured to output the start signal.

3. The fuel injection controller of claim 1 wherein, The on-off unit comprises a switch tube, a seventh resistor and an eighth resistor; The control end of the switch tube is electrically connected with the first end of the seventh resistor, and is configured to receive the start signal; The first end of the switch tube is electrically connected with the second end of the seventh resistor and the first end of the eighth resistor; The second end of the switch tube is electrically connected with the ground end of the oil injector; The second end of the eighth resistor is electrically connected with the ground end.

4. The fuel injection controller of claim 1 wherein, The timeout comparison unit comprises an RC integration module and a comparison module; The RC integration module is configured to receive a driving signal and convert an effective level of the driving signal into an integration voltage; The comparison module is configured to receive the integration voltage and output a timeout control signal when the integration voltage is greater than a preset voltage.

5. The fuel injection controller of claim 4 wherein, The RC integration module comprises a ninth resistor, a tenth resistor, a first diode and a first capacitor; The first end of the ninth resistor is electrically connected with the cathode of the first diode and configured to receive the driving signal, the second end of the ninth resistor is electrically connected with the first end of the first capacitor and the first end of the tenth resistor and configured to output the integration voltage; The second end of the first capacitor is electrically connected with the ground end; The second end of the tenth resistor is electrically connected with the anode of the first diode; The comparison module comprises a comparator; The non-inverting input end of the comparator is configured to receive the integration voltage, the inverting input end of the comparator is configured to receive the preset voltage, the first power end of the comparator is electrically connected with the ground end, the second power end of the comparator is configured to receive a second power voltage, and the output end of the comparator is configured to output the timeout control signal.

6. The injection controller of claim 1, wherein Further comprising a timeout control reset unit; The timeout control reset unit is configured to receive the driving signal and turn on a path between the timeout control unit and the ground end when the driving signal is at an invalid level, so as to turn off the timeout control unit.

7. The fuel injection controller of claim 6 wherein, The timeout control reset unit comprises a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a fourth PNP transistor and a second NPN transistor; The first end of the sixteenth resistor is configured to receive the driving signal, and the second end of the sixteenth resistor is electrically connected with the base of the fourth PNP transistor; The emitter of the fourth PNP transistor is configured to receive the second power voltage, and the collector of the fourth PNP transistor is electrically connected with the first end of the seventeenth resistor; The second end of the seventeenth resistor is electrically connected with the first end of the eighteenth resistor and the base of the second NPN transistor; The second end of the eighteenth resistor is electrically connected with the ground end and the emitter of the second NPN transistor; The collector of the second NPN transistor is electrically connected with the timeout control unit.

8. A fuel injection control method characterized by, The method is applied to the oil injection controller as claimed in any one of claims 1 to 7, and the method comprises: The driving unit receives a driving signal, and under the control of a first driving sub-signal, the on-off unit provides an opening signal, and under the control of a second driving sub-signal, the on-off unit stops providing the opening signal, wherein the first driving sub-signal represents an effective level of the driving signal, and the second driving sub-signal represents an ineffective level of the driving signal; The on-off unit, upon receiving the opening signal, turns on a path between a ground end and a ground end of the oil injector to open the oil injector; The timeout comparison unit receives the driving signal and converts the effective level of the driving signal into an integral voltage, and when the integral voltage is greater than a preset voltage, outputs a timeout control signal; The timeout control unit receives the timeout control signal and, under the control of the timeout control signal, switches the first driving sub-signal to the second driving sub-signal.

9. A fuel injection control system characterized by comprising: The oil injection controller comprises the oil injection controller according to any one of claims 1-7 and an oil injector connected to the oil injection controller.

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