CN220036823U - Fuel injection driving diagnosis circuit and fuel injection driving system - Google Patents
Fuel injection driving diagnosis circuit and fuel injection driving system Download PDFInfo
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- CN220036823U CN220036823U CN202321763599.5U CN202321763599U CN220036823U CN 220036823 U CN220036823 U CN 220036823U CN 202321763599 U CN202321763599 U CN 202321763599U CN 220036823 U CN220036823 U CN 220036823U
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- 238000003745 diagnosis Methods 0.000 title claims abstract description 111
- 238000002347 injection Methods 0.000 title claims abstract description 74
- 239000007924 injection Substances 0.000 title claims abstract description 74
- 239000000446 fuel Substances 0.000 title claims abstract description 72
- 238000001514 detection method Methods 0.000 claims abstract description 21
- 238000005070 sampling Methods 0.000 claims description 17
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 description 14
- 238000010586 diagram Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 6
- 230000000630 rising effect Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model provides a fuel injection driving diagnosis circuit and a fuel injection driving system, which relate to the technical field of electronic circuits, wherein the circuit comprises: the driving circuit comprises a driving chip, a first voltage diagnosis circuit, a second voltage diagnosis circuit, a current diagnosis circuit, a high-side driving circuit and a low-side driving circuit; the input end of the driving chip is connected with diagnostic data, and the output end of the driving chip outputs a driving control signal; the input end of the driving chip is connected with the first voltage diagnosis circuit, the second voltage diagnosis circuit and the current diagnosis circuit, and the output end of the driving chip is connected with the control end of the high-side driving circuit and the control end of the low-side driving circuit; the first voltage diagnosis circuit is connected with a voltage detection end of the high-side driving circuit; the second voltage diagnosis circuit is connected with the voltage detection end of the low-side driving circuit; the current diagnosis circuit is connected with a current detection end of the low-side driving circuit. The circuit structure of the oil injection driving diagnosis circuit can increase the variety of fault diagnosis and realize the comprehensive detection of an oil injection driving system.
Description
Technical Field
The utility model relates to the technical field of electronic circuits, in particular to a fuel injection driving diagnosis circuit and a fuel injection driving system.
Background
In an apparatus using fuel as power, a fuel injection driving system is provided, and the safety of the fuel injection driving system is related to the operation of the whole apparatus, for example, in the field of vehicles, the safety of the fuel injection driving system affects the safety of personnel in the vehicle, and therefore, fault detection of the fuel injection driving system is required.
At present, the oil injection driving diagnosis generally only uses the diagnosis function of a special high-side pre-driving chip arranged on a high-side circuit, the scheme generally only detects overcurrent or overtemperature, the diagnosis function is single, the application range is narrow, more faults cannot be diagnosed, the fault types cannot be distinguished, and the oil injection driving system cannot be comprehensively detected.
Disclosure of Invention
In view of the above, the utility model aims to provide a fuel injection driving diagnosis circuit and a fuel injection driving system, which can solve the problem that the conventional fuel injection driving diagnosis is incomplete.
In view of the above object, the present utility model proposes, in a first aspect, a fuel injection driving diagnostic circuit including: the driving circuit comprises a driving chip, a first voltage diagnosis circuit, a second voltage diagnosis circuit, a current diagnosis circuit, a high-side driving circuit and a low-side driving circuit; the driving chip comprises an input end and an output end, the input end of the driving chip is connected with diagnostic data, and the output end of the driving chip outputs a driving control signal; the driving chip is connected with one end of the first voltage diagnosis circuit through a first input end, is connected with one end of the second voltage diagnosis circuit through a second input end, is connected with one end of the current diagnosis circuit through a third input end, is connected with the control end of the high-side driving circuit through a first output end, and is connected with the control end of the low-side driving circuit through a second output end; the other end of the first voltage diagnosis circuit is connected with the voltage detection end of the high-side driving circuit; the other end of the second voltage diagnosis circuit is connected with the voltage detection end of the low-side driving circuit; the other end of the current diagnosis circuit is connected with the current detection end of the low-side driving circuit.
Optionally, the first voltage diagnostic circuit and the second voltage diagnostic circuit each include: a first comparator, a second comparator, and a third comparator; the positive input end of the first comparator is connected with a voltage detection signal, the negative input end of the first comparator is connected with the output end of the first comparator, and the output end of the first comparator is respectively connected with the positive input end of the second comparator and the positive input end of the third comparator; the negative input end of the second comparator is connected with a first comparison voltage, and the negative input end of the third comparator is connected with a second comparison voltage; the output end of the second comparator and the output end of the third comparator are both connected with the driving chip.
Optionally, the high-side driving circuit comprises a high-side switch and an oil sprayer; the first end of the high-side switch is connected with a power supply, and the second end of the high-side switch is connected with one end of the oil sprayer; the other end of the first voltage diagnosis circuit is connected with the third end of the high-side switch, and the first output end of the driving chip is connected with the fourth end of the high-side switch.
Optionally, the low-side driving circuit includes: a low-side switch and a sampling resistor; the other end of the oil sprayer is connected with the first end of the low-side switch, and the second end of the low-side switch is connected with the other end of the second voltage diagnosis circuit; the first end of the sampling resistor is connected with the third end of the low-side switch, the second end of the sampling resistor is connected with the other end of the current diagnosis circuit, and the third end of the sampling resistor is grounded.
Optionally, the current diagnostic circuit includes: a fourth comparator and an analog-to-digital conversion module; the positive input end and the negative input end of the fourth comparator are respectively connected with two ends of the sampling resistor of the low-side driving circuit; the output end of the fourth comparator is connected with one end of the analog-to-digital conversion module, and the other end of the analog-to-digital conversion module is connected with the driving chip.
In a second aspect, there is also provided a fuel injection drive system comprising the fuel injection drive diagnostic circuit of any one of the first aspects.
In general, the present utility model has at least the following benefits:
an embodiment of the present utility model provides an oil injection driving diagnosis circuit including: the driving chip, the first voltage diagnosis circuit, the second voltage diagnosis circuit, the current diagnosis circuit, the high-side driving circuit and the low-side driving circuit can realize the rapid diagnosis of short circuit between the high-side driving circuit and the low-side driving circuit, and the diagnosis of the short circuit between the high-side driving circuit and the low-side driving circuit, and the rapid diagnosis of the short circuit between the high-side driving circuit and the low-side driving circuit, and the diagnosis of the fault type between the high-side driving circuit and the low-side driving circuit can be wider under different working states of the fuel injector, so that the fuel injection driving system can be comprehensively detected.
Drawings
In the drawings, the same reference numerals refer to the same or similar parts or elements throughout the several views unless otherwise specified. The figures are not necessarily drawn to scale. It is appreciated that these drawings depict only some embodiments according to the disclosure and are not therefore to be considered limiting of its scope.
FIG. 1 shows a schematic diagram of a fuel injection drive diagnostic circuit of the present utility model;
FIG. 2 shows a schematic diagram of the voltage diagnostic circuit of the present utility model;
FIG. 3 shows a schematic diagram of the current diagnostic circuit of the present utility model;
FIG. 4 is a schematic diagram of the fuel injection drive control waveform and load current variation of the present utility model;
fig. 5 shows a schematic diagram of the structure of the fuel injection driving system of the present utility model.
Reference numerals in the specific embodiments are as follows:
the driving chip 101, the first voltage diagnosis circuit 102, the second voltage diagnosis circuit 103, the current diagnosis circuit 104, the high-side driving circuit 105, the low-side driving circuit 106, the analog-to-digital conversion module 107, the high-side switch 1051, the fuel injector 1052, the low-side switch 1061, the sampling resistor 1062, the fuel injection driving system 500, and the fuel injection driving circuit 501.
Detailed Description
The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be noted that, for convenience of description, only the portions related to the present utility model are shown in the drawings.
It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.
Based on the diagnosis of the current oil injection driving, only the diagnosis function of a special high-side pre-driving chip arranged on a high-side circuit is generally used, the scheme is generally used for detecting only overcurrent or overtemperature, the diagnosis function is single, the application range is narrow, more faults cannot be diagnosed, the fault types cannot be distinguished, and the oil injection driving system cannot be comprehensively detected. The embodiment provides a fuel injection driving diagnosis circuit and a fuel injection driving system, which can realize rapid diagnosis of at least short circuit between a high-side driving circuit and a power supply, short circuit between a high-side driving circuit and a ground, short circuit between a low-side driving circuit and short circuit between the high-side driving circuit and the low-side driving circuit, and short circuit between the high-side driving circuit and the low-side driving circuit under different working states of a fuel injector by arranging the fuel injection driving diagnosis circuit, and has wider fault types for diagnosis, thereby realizing comprehensive detection of the fuel injection driving system. In addition, the oil injection driving diagnosis method of the embodiment can respectively perform rapid diagnosis on the oil injection driving system in the whole oil injection period in two states before oil injection and in oil injection, and when faults occur, the oil injector is controlled to stop oil injection, so that the damage of devices is avoided, more faults can be reported and different fault types can be distinguished compared with the self-diagnosis which is performed only by means of a pre-driving chip.
Fig. 1 shows a schematic diagram of the fuel injection driving diagnostic circuit of the present utility model. In one example, the fuel injection driving diagnostic circuit of the present embodiment may be applied to any device using fuel as a drive, and for convenience of description, the fuel injection driving diagnostic circuit of the present embodiment is applied to the field of vehicles.
Referring to fig. 1, in an embodiment of the present utility model, an oil injection driving diagnosis circuit includes: a driving chip 101, a first voltage diagnosis circuit 102, a second voltage diagnosis circuit 103, a current diagnosis circuit 104, a high-side driving circuit 105, and a low-side driving circuit 106. The driving chip 101 includes an input terminal and an output terminal, the input terminal of the driving chip 101 is connected to the diagnostic data, and the output terminal of the driving chip 101 outputs a driving control signal. The diagnosis data is collected by the first voltage diagnosis circuit 102, the second voltage diagnosis circuit 103 and the current diagnosis circuit 104, the driving chip 101 judges whether the high-side driving circuit 105 and the low-side driving circuit 106 have faults according to the diagnosis data to obtain fault diagnosis results, and outputs driving control signals based on the fault diagnosis results, for example, when the fault diagnosis results show that the high-side driving circuit 105 or the low-side driving circuit 106 are normal, the driving chip 101 outputs driving control signals for controlling the fuel injector to start fuel injection, and when the fault diagnosis results show that the high-side driving circuit 105 or the low-side driving circuit 106 have faults, the driving chip 101 outputs driving control signals for controlling the fuel injector to stop fuel injection, so that the fuel injector can be timely controlled to stop fuel injection when the high-side driving circuit 105 and the low-side driving circuit 106 have faults, the damage of components is avoided, and the safety of the driving system is ensured.
In the embodiment of the present utility model, the driving chip 101 is connected to one end of the first voltage diagnostic circuit 102 through the first input terminal, the driving chip 101 is connected to one end of the second voltage diagnostic circuit 103 through the second input terminal, and the driving chip 101 is connected to one end of the current diagnostic circuit 104 through the third input terminal. This connection may enable the driver chip 101 to receive the high-side voltage diagnostic data from the first voltage diagnostic circuit 102, the low-side voltage diagnostic data from the second voltage diagnostic circuit 103, and the current diagnostic data from the current diagnostic circuit 104.
In the embodiment of the utility model, the driving chip 101 adopts the ready-made programmable gate array (Field Programmable Gate Array, FPGA), and compared with the prior art that adopts the pre-driving chip to schedule the processing items to the diagnosis information and then cut off the driving, the processing speed of the FPGA is faster, the method has great advantage in the diagnosis speed, and the diagnosis fault can be reported more quickly.
In the embodiment of the present utility model, the driving chip 101 is connected to the control end of the high-side driving circuit 105 through the first output end, and the driving chip 101 is connected to the control end of the low-side driving circuit 106 through the second output end. This connection may enable the driver chip 101 to generate a high-side control signal and a low-side control signal according to the received diagnostic data, and control the high-side driver circuit 105 and the low-side driver circuit 106 to operate, respectively.
In the embodiment of the present utility model, the other end of the first voltage diagnosis circuit 102 is connected to the voltage detection end of the high-side driving circuit 105, so as to receive the voltage signal of the high-side driving circuit 105.
In the embodiment of the present utility model, the other end of the second voltage diagnosis circuit 103 is connected to the voltage detection end of the low-side driving circuit 106, so as to receive the voltage signal of the low-side driving circuit 106.
In the embodiment of the present utility model, the other end of the current diagnostic circuit 104 is connected to the current detection end of the low-side driving circuit 106 to receive the current signal of the low-side driving circuit 106.
It will be appreciated that the high side driving circuit 105 in the embodiment of the present utility model refers to a driving circuit connected to a power supply terminal, and the low side driving circuit 106 refers to a driving circuit connected to a ground terminal.
Fig. 2 shows a schematic diagram of the structure of the voltage diagnostic circuit of the present utility model. In the embodiment of the present utility model, the circuit structures of the first voltage diagnosis circuit 102 and the second voltage diagnosis circuit 103 are each as shown in the voltage diagnosis circuit of fig. 2.
Referring to fig. 2, the first voltage diagnosis circuit 102 and the second voltage diagnosis circuit 103 each include: a first comparator U1, a second comparator U2, and a third comparator U3; the positive input end of the first comparator U1 is connected with a voltage detection signal, the negative input end of the first comparator U1 is connected with the output end of the first comparator U1, and the output end of the first comparator U1 is respectively connected with the positive input end of the second comparator U2 and the positive input end of the third comparator U3. The negative input end of the second comparator U2 is connected with the first comparison voltage, the negative input end of the third comparator U3 is connected with the second comparison voltage, and the output end of the second comparator U2 and the output end of the third comparator U3 are both connected with the driving chip 101.
In one example, the voltage detection signal coupled to the positive input of the first comparator U1 of the first voltage diagnostic circuit 102 includes the voltage signal of the high-side driving circuit 105, and the voltage detection signal coupled to the positive input of the first comparator U1 of the second voltage diagnostic circuit 103 includes the voltage signal of the low-side driving circuit 106. The first comparator U1 may be used as a follower to increase the circuit input resistance and decrease the output resistance.
In one example, since the high-side driving circuit 105 is further connected to other circuit units, there is generally a floating voltage X on the output pin (voltage detection end) of the high-side driving circuit 105, the value of the floating voltage X is between 0V and the power voltage, and the specific magnitude of the floating voltage X is determined by the other circuit units, according to this case, the magnitude of the first comparison voltage is set to (V power +x)/2, and the magnitude of the second comparison voltage is set to X/2.
In the embodiment of the utility model, the circuit structure of the provided voltage diagnosis circuit can judge the input voltage of the voltage diagnosis circuit through the output high-low level of the second comparator U2 and the third comparator U3, and further can obtain the fault diagnosis result of whether the high-side driving circuit 105 is faulty or not and whether the low-side driving circuit 106 is faulty or not.
Referring to fig. 1, the high-side driving circuit 105 includes a high-side switch 1051 and an injector 1052, a first end of the high-side switch 1051 is connected to a power supply, a second end of the high-side switch 1051 is connected to one end of the injector 1052 to control on and off between the injector 1052 and the power supply, the other end of the first voltage diagnosis circuit 102 is connected to a third end of the high-side switch 1051 to obtain voltage data of the high-side driving circuit 105, and a first output end of the driving chip 101 is connected to a fourth end of the high-side switch 1051 to facilitate the driving chip 101 to transmit a driving control signal through a high-side control signal.
In an embodiment of the present utility model, the low-side driving circuit 106 includes: the other end of the fuel injector is connected with the first end of the low-side switch 1061, so that the low-side switch 1061 can be powered on, the second end of the low-side switch 1061 is connected with the other end of the second voltage diagnosis circuit 103 to control connection of the fuel injector 1052 and the ground, the first end of the sampling resistor 1062 is connected with the third end of the low-side switch 1061, the second end of the sampling resistor 1062 is connected with the other end of the current diagnosis circuit 104, and the third end of the sampling resistor 1062 is grounded, so that the current diagnosis circuit 104 can acquire current data of the sampling resistor 1062.
Fig. 3 shows a schematic diagram of the structure of the current diagnostic circuit of the present utility model. Referring to fig. 3, the current diagnostic circuit 104 includes: the positive input end and the negative input end of the fourth comparator U4 are respectively connected with two ends of a sampling resistor of the low-side driving circuit 106, the output end of the fourth comparator U4 is connected with one end of the analog-to-digital conversion module 107, and the other end of the analog-to-digital conversion module 107 is connected with the driving chip 101.
In the embodiment of the present utility model, the current of the low-side driving circuit 106 can be converted into the voltage by the sampling resistor, and the converted voltage is amplified by the fourth comparator U4, and the amplified voltage is AD-converted by the analog-to-digital conversion module 107 and then outputted to the driving chip 101.
In one example, the negative input terminal of the fourth comparator U4 is further connected to R1 and R2, which can be used as balancing resistors, so that voltages at the positive and negative ends in the path of the circuit are equal.
In this embodiment, the first voltage diagnostic circuit 102 may output the high-side voltage diagnostic data of the high-side driving circuit 105 to the driving chip 101, the second voltage diagnostic circuit 103 may output the low-side voltage diagnostic data to the driving chip 101, the current diagnostic circuit 104 may output the current diagnostic data to the driving chip 101, and the driving chip 101 may obtain a fault diagnostic result indicating whether the high-side driving circuit 105 and the low-side driving circuit 106 are faulty or not according to the received data, where the fault diagnostic result includes one or more fault information of shorting the high-side driving circuit to the power supply, shorting the high-side driving circuit to the ground, shorting the low-side driving circuit to the power supply, shorting the low-side driving circuit to the ground, and shorting between the high-side driving circuit and the low-side driving circuit.
The above is an oil injection driving diagnosis circuit provided in this embodiment, and the circuit principle of the circuit is described below:
it should be noted that, since no current flows in the whole driving circuit before the fuel injector sprays, the voltage is static, and in the process of spraying the fuel injector, the high-side switch of the high-side driving circuit 105 needs frequent switching, and the voltage diagnosis difficulty is high in the switching period us level, therefore, in this embodiment, before the fuel injector sprays, the voltage diagnosis is performed by the first voltage diagnosis circuit 102 and the second voltage diagnosis circuit 103, and in the process of spraying the fuel injector, the current diagnosis circuit 104 is used for performing the current diagnosis.
Then, before the fuel injector injects fuel, the output levels of the second comparator U2 and the third comparator U3 are obtained through comparing the output voltage of the high-side driving circuit 105 received by the first voltage diagnosis circuit 102 with the first comparison voltage and the second comparison voltage, and whether the high-side driving circuit 105 fails is determined according to the output levels.
Specifically, for the first voltage diagnostic circuit 102:
if the output levels of the second comparator U2 and the third comparator U3 are 01, it is indicated that the voltage value of the high-side driving circuit 105 is between X/2 and (V power +x)/2, and that the high-side driving circuit 105 is normal within the normal operating voltage range of the high-side driving circuit 105.
If the output levels of the second comparator U2 and the third comparator U3 are 11, it indicates that the voltage value of the high-side driving circuit 105 is greater than (V power +x)/2, and this indicates that the voltage is too high, and a fault occurs in which the high-side driving circuit is shorted to the power supply.
If the output levels of the second comparator U2 and the third comparator U3 are 00, it indicates that the voltage value of the high-side driving circuit 105 is smaller than X/2, and this indicates that the voltage is too low, and a fault occurs in which the high-side driving circuit is shorted to ground.
Since the first voltage diagnostic circuit 102 and the second voltage diagnostic circuit 103 are identical in circuit principle, the second voltage diagnostic circuit 103 is identical:
if the output levels of the second comparator U2 and the third comparator U3 are 01, it is indicated that the voltage value of the low-side driving circuit 106 is between X/2 and (V power +x)/2, and that the low-side driving circuit 106 is normal within the normal operating voltage range of the low-side driving circuit 106.
If the output levels of the second comparator U2 and the third comparator U3 are 11, it indicates that the voltage value of the low-side driving circuit 106 is greater than (V power +x)/2, and this indicates that the voltage is too high, and a fault occurs in which the low-side driving circuit is shorted to the power supply.
If the output levels of the second comparator U2 and the third comparator U3 are 00, the voltage value of the low-side driving circuit 106 is smaller than X/2, and the voltage is too low, so that the low-side driving circuit is short to the ground.
In the case where the output levels of the second comparator U2 and the third comparator U3 of the first voltage diagnosis circuit 102 are 01 and the output levels of the second comparator U2 and the third comparator U3 of the second voltage diagnosis circuit 103 are 00, it is indicated that the voltage value of the high-side driving circuit 105 is between X/2 and (V power supply +x)/2, and the voltage value of the low-side driving circuit 106 is less than X/2, which contradicts each other, indicating a failure of the open circuit between the high-side driving and the low-side driving.
The method can obtain the faults of short circuit of the high-side drive to the power supply, short circuit of the high-side drive to the ground, short circuit of the low-side drive to the power supply, short circuit of the low-side drive to the ground, and open circuit between the high-side drive and the low-side drive.
In addition, since the low-side driving circuit 106 is always turned on during the injection, the diagnosis of the low-side to ground fault cannot be performed, and thus, during the injection, the fault diagnosis of the short circuit between the high-side driving circuit and the power supply, the short circuit between the high-side driving circuit and the low-side driving circuit, and the short circuit between the high-side driving circuit and the low-side driving circuit can be performed.
Fig. 4 shows a schematic diagram of the fuel injection driving control waveform and load current variation of the present utility model. With the variation of the fuel injection driving waveform in fig. 4, the current of the load connected to the fuel injection driving diagnostic circuit also varies, including Peak phase, hold1 current maintenance phase and Hold2 current maintenance phase.
The Peak stage causes the current to rise from the beginning to the Peak maximum value, and the voltage of the high-side driving circuit 105 is higher in the Peak stage, so that the opening degree of the fuel injector is rapidly increased through high voltage and high current, and the dynamic response parameter of fuel injection is improved.
In the Hold1 current maintaining stage and the Hold2 current maintaining stage, the current on the load is maintained in a preset range, wherein Hold1 current values (Max-Min) represent the upper limit and the lower limit of a corresponding maintaining interval in the Hold1 current maintaining stage, and Hold2 current values (Max-Min) represent the upper limit and the lower limit of the corresponding maintaining interval in the Hold2 current maintaining stage. The specific values of Hold1 and Hold2 are determined by the load characteristics, and the specific parameters are related to the load model and manufacturer.
The fault diagnosis principle in the oil injection process is as follows:
because the voltage in the Peak stage is higher, if the high-side drive short circuit is connected to the power supply, the voltage is reduced, and the current rising rate is smaller than the normal value, the embodiment of the utility model can obtain the fault of the high-side drive short circuit to the power supply by judging the current rising rate in the Peak stage.
If the high-side driving is shorted to the ground, the high-side driving voltage is less than (V power +x)/2 in the high-side switch open state in the oil injection stage, resulting in the output level of the second comparator U2 of the high-side driving circuit 105 being set to 0, so that the embodiment of the utility model can obtain the fault that the high-side driving is shorted to the ground through the output levels of the second comparator U2 and the third comparator U3 of the high-side driving circuit 105 in the high-side switch open state.
The current of the normal load rises slowly, and the current can rise rapidly when the low-side drive is short-circuited to the power supply, so that the embodiment of the utility model can obtain the fault that the low-side drive is short-circuited to the power supply through the current rising rate.
If the open circuit between the high-side drive and the low-side drive can cause the current to drop 0, the embodiment of the utility model can directly obtain the open circuit fault between the high-side drive and the low-side drive through the magnitude of the current value during oil injection.
If short circuit is caused between the high-side drive and the low-side drive, the current can rise rapidly when the high-side switch is opened, and the current can drop rapidly when the high-side switch is closed, so that the fault of the short circuit between the high-side drive and the low-side drive can be obtained through the current change rate when the high-side switch is opened and closed.
Wherein, the short circuit of the high side drive to the power supply means that the high side switch is in short circuit with the power supply, the short circuit of the high side drive to the ground means that the high side switch is directly grounded, the short circuit of the low side drive to the power supply means that the low side switch is in short circuit with the power supply, the short circuit of the low side drive to the ground means that the low side switch is directly grounded, the open circuit between the high side drive and the low side drive means that the open circuit between the high side drive circuit 105 and the low side drive circuit 106 is opened, and the short circuit between the high side drive and the low side drive means that the short circuit between the high side drive circuit 105 and the low side drive circuit 106 is closed.
Based on the description of the principle, one or more fault diagnosis results of short circuit between the high-side drive and the power supply, short circuit between the high-side drive and the ground, short circuit between the low-side drive and the power supply, short circuit between the low-side drive and the high-side drive and short circuit between the high-side drive and the low-side drive can be obtained according to the diagnosis data, so that more comprehensive fault diagnosis is realized.
Based on the above-described fuel injection driving diagnostic circuit, referring to fig. 5, another embodiment of the present utility model provides a fuel injection driving system 500 including the fuel injection driving diagnostic circuit 501 described in any one of the foregoing. Specific fuel injection driving circuit 501 includes the circuits shown in any of fig. 1-3.
In one example, the fuel injection drive system 501 is a fuel injection drive system of a vehicle.
The fuel injection driving system provided by the embodiment of the utility model and the fuel injection driving diagnosis circuit provided by the embodiment of the utility model have the same beneficial effects because of the same inventive concept.
It should be noted that:
in the above text, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. Furthermore, it should be noted that the scope of the methods and apparatus in the embodiments of the present utility model is not limited to performing the functions in the order shown or discussed, but may also include performing the functions in a substantially simultaneous manner or in an opposite order depending on the functions involved, e.g., the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.
The embodiments of the present utility model have been described above with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, which are merely illustrative, not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present utility model and the scope of the claims, which are to be protected by the present utility model.
Claims (6)
1. A fuel injection drive diagnostic circuit, said circuit comprising: the driving circuit comprises a driving chip, a first voltage diagnosis circuit, a second voltage diagnosis circuit, a current diagnosis circuit, a high-side driving circuit and a low-side driving circuit;
the driving chip comprises an input end and an output end, the input end of the driving chip is connected with diagnostic data, and the output end of the driving chip outputs a driving control signal; the driving chip is connected with one end of the first voltage diagnosis circuit through a first input end, is connected with one end of the second voltage diagnosis circuit through a second input end, is connected with one end of the current diagnosis circuit through a third input end, is connected with the control end of the high-side driving circuit through a first output end, and is connected with the control end of the low-side driving circuit through a second output end;
the other end of the first voltage diagnosis circuit is connected with the voltage detection end of the high-side driving circuit;
the other end of the second voltage diagnosis circuit is connected with the voltage detection end of the low-side driving circuit;
the other end of the current diagnosis circuit is connected with the current detection end of the low-side driving circuit.
2. The fuel injection drive diagnostic circuit according to claim 1, wherein the first voltage diagnostic circuit and the second voltage diagnostic circuit each include: a first comparator, a second comparator, and a third comparator;
the positive input end of the first comparator is connected with a voltage detection signal, the negative input end of the first comparator is connected with the output end of the first comparator, and the output end of the first comparator is respectively connected with the positive input end of the second comparator and the positive input end of the third comparator;
the negative input end of the second comparator is connected with a first comparison voltage, and the negative input end of the third comparator is connected with a second comparison voltage;
the output end of the second comparator and the output end of the third comparator are both connected with the driving chip.
3. The fuel injection drive diagnostic circuit of claim 1 wherein the high side drive circuit comprises a high side switch and a fuel injector;
the first end of the high-side switch is connected with a power supply, and the second end of the high-side switch is connected with one end of the oil sprayer;
the other end of the first voltage diagnosis circuit is connected with the third end of the high-side switch, and the first output end of the driving chip is connected with the fourth end of the high-side switch.
4. The fuel injection drive diagnostic circuit of claim 3 wherein the low side drive circuit comprises: a low-side switch and a sampling resistor;
the other end of the oil sprayer is connected with the first end of the low-side switch, and the second end of the low-side switch is connected with the other end of the second voltage diagnosis circuit;
the first end of the sampling resistor is connected with the third end of the low-side switch, the second end of the sampling resistor is connected with the other end of the current diagnosis circuit, and the third end of the sampling resistor is grounded.
5. The fuel injection drive diagnostic circuit according to claim 1, wherein the current diagnostic circuit includes: a fourth comparator and an analog-to-digital conversion module;
the positive input end and the negative input end of the fourth comparator are respectively connected with two ends of the sampling resistor of the low-side driving circuit;
the output end of the fourth comparator is connected with one end of the analog-to-digital conversion module, and the other end of the analog-to-digital conversion module is connected with the driving chip.
6. A fuel injection drive system, characterized in that the fuel injection drive system comprises a fuel injection drive diagnostic circuit as claimed in any one of claims 1 to 5.
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| CN202321763599.5U CN220036823U (en) | 2023-07-06 | 2023-07-06 | Fuel injection driving diagnosis circuit and fuel injection driving system |
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| CN202321763599.5U CN220036823U (en) | 2023-07-06 | 2023-07-06 | Fuel injection driving diagnosis circuit and fuel injection driving system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116085128A (en) * | 2022-12-23 | 2023-05-09 | 潍柴动力股份有限公司 | Control device and system of fuel injector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116085128A (en) * | 2022-12-23 | 2023-05-09 | 潍柴动力股份有限公司 | Control device and system of fuel injector |
| CN116085128B (en) * | 2022-12-23 | 2024-08-16 | 潍柴动力股份有限公司 | Control device and system of fuel injector |
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