Fuel cell system control device with self-diagnosis function

Abstract

The utility model discloses a fuel cell system control device with a self-diagnosis function, which respectively feeds back a control signal output by a control unit and a driving signal output by a driving chip to the control unit on the basis of the prior art. When an instruction for controlling a load to act is received and the load does not act, whether the control device fails or the load fails can be judged by judging whether a control signal output by the control unit is consistent with a driving signal output by the driving chip; otherwise, the control device has a fault. According to the utility model, the self-diagnosis function is realized, so that the maintenance personnel do not need to carry out corresponding troubleshooting, and the maintenance efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a fuel cell system control device, especially a fuel cell system control device with self-diagnosis function. BACKGROUND

[0002] The control device is an important component of the fuel cell system, and has a control unit such as a single-chip microcomputer, an FPGA or a DSP. The control unit is connected to an input unit, a communication unit supporting CAN, RS485 or RS232, a high / low-side driving chip and a PWM driving chip. The input unit mainly receives analog signals, digital signals and frequency monitoring signals and transmits them to the control unit. The control unit outputs signals which are processed by the high / low-side driving chip and the PWM driving chip to drive relays, pumps, contactors and other loads. However, when the control device receives an instruction to control the load to act but the load does not act, it is difficult to directly determine whether the control device or the load is faulty, and the maintenance personnel need to troubleshoot accordingly, resulting in a large amount of maintenance work and low efficiency. SUMMARY

[0003] The utility model discloses in order to solve the above technical problem of prior art, provide a kind of fuel cell system control device with self-diagnosis function.

[0004] The technical solution of the utility model is as follows: a fuel cell system control device with self-diagnosis function has a control unit, and the control unit is connected to an input unit and a communication unit. The output end of the control unit is connected to a high / low-side driving chip and a PWM driving chip. The driving signals output by the high / low-side driving chip are connected to the control unit through a high / low-side driving signal detection unit. The driving signals output by the PWM driving chip are connected to the control unit through a PWM driving signal detection unit. The high / low-side control signals output by the control unit are fed back to the input end of the control unit through a resistor R1. The PWM control signals output by the control unit are fed back to the input end of the control unit through a resistor R2.

[0005] Preferably, the high / low-side driving signal detection unit and the PWM driving signal detection unit are both provided with an optoelectronic coupler. The input end of the optoelectronic coupler is connected to a forward diode D1 and a reverse diode D2. The input end of the optoelectronic coupler is also connected to a pull-up resistor R3 or a pull-down resistor R4. One end of the output end of the optoelectronic coupler is connected to a resistor R5, and the other end is grounded.

[0006] The utility model discloses on the basis of prior art, the control signal of control unit output and the drive signal of drive chip output are fed back to control unit respectively. When receiving the instruction of controlling load action and the phenomenon of load inaction appears, whether the control signal of control unit output and the drive signal of drive chip output are consistent can be judged, thereby judging whether control device fault or load fault: if the pair of control drive signal of control unit receiving is consistent, it illustrates that load appears the fault, otherwise, it is control device itself problem. The control device of the utility model has self -diagnosis function, and the corresponding troubleshooting of repair personnel need not be carried out again, and the repair efficiency is improved. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 It is the circuit diagram of the utility model embodiment.

[0008] Figure 2 It is the circuit diagram of high / low side drive signal detection unit and PWM drive signal detection unit in the utility model embodiment.

[0009] 1. control unit 1;2. input unit;3. communication unit;4. high / low side drive chip;5. PWM drive chip;6. high / low side drive signal detection unit;7. PWM drive signal detection unit;8. photoelectric coupler. DETAILED DESCRIPTION

[0010] The fuel cell system control device of the utility model can diagnose itself as shown in Figure 1 The same as prior art is that there is control unit 1, and input unit 2 and communication unit 3 supporting CAN, RS485 or RS232 are connected with control unit 1, and control unit 1 can adopt single-chip microcomputer, FPGA or DSP etc., and the output end of control unit 1 is connected with high / low side drive chip 4 and PWM drive chip 5 respectively, and the difference from prior art is that the drive signal of high / low side drive chip 4 is connected with control unit 1 through high / low side drive signal detection unit 6, the drive signal of PWM drive chip 5 is connected with control unit 1 through PWM drive signal detection unit 7, the high / low side drive control signal of control unit 1 is fed back to the input end of control unit 1 through resistance R1, and the PWM drive control signal of control unit 1 is fed back to the input end of control unit 1 through resistance R2.

[0011] The structure of high / low side drive signal detection unit 6 and PWM drive signal detection unit 7 is as shown in Figure 2As shown, there is a photoelectric coupler 8, the input end of which is connected with the forward diode D1 and the reverse diode D2, and the input end of which is also connected with the pull-up resistor R3 or the pull-down resistor R4, the other end of the pull-up resistor R3 being connected with the VCC-Power or 5V voltage, the other end of the pull-down resistor R4 being connected with the ground, and one end of the output end of the photoelectric coupler 8 being connected with the resistor R5 and the other end being connected with the ground. The photoelectric coupler can effectively play an isolation role and prevent noise interference.

[0012] Working process:

[0013] 1. When the control unit 1 receives an instruction for controlling the action of the load, the control unit 1 outputs control signals to the high / low-side drive chip 4 and the PWM drive chip 5 respectively, at this time, the resistors R1 and R2 respectively feed back the control signals output by the control unit 1 to the control unit 1;

[0014] 2. The drive signals output by the high / low-side drive chip 4 are adjusted by the pull-up resistor R3 or the pull-down resistor R4 of the high / low-side drive signal detection unit 6, and are converted into a wide range of voltages that can be recognized by the control unit 1, when the current at the input end of the photoelectric coupler 7 is greater than the starting current, the output end of the photoelectric coupler 7 is turned on, and the drive signals output by the high / low-side drive chip 4 are input to the control unit 1;

[0015] Similarly, the PWM drive signal detection unit 7 inputs the drive signals output by the PWM drive chip 5 to the control unit 1;

[0016] 3. The control unit 1 judges whether the control signals fed back by the resistor R1 are consistent with the drive signals output by the high / low-side drive chip 4, and judges whether the control signals fed back by the resistor R2 are consistent with the drive signals output by the PWM drive chip 5 at the same time. If the results of the two judgments are consistent, the control device 1 is running normally, otherwise the control device 1 has a fault; the obtained judgment result (message) can be uploaded through the communication unit 3 or displayed through the display connected with the control unit 1.

Claims

1. A fuel cell system control device with self-diagnosis function, having a control unit (1), an input unit (2) and a communication unit (3) connected to the control unit (1), and an output end of the control unit (1) connected to a high / low side drive chip (4) and a PWM drive chip (5) respectively, characterized in that: The driving signal outputted by the high / low side driving chip (4) is connected with the control unit (1) through the high / low side driving signal detection unit (6), the driving signal outputted by the PWM driving chip (5) is connected with the control unit (1) through the PWM driving signal detection unit (7), the high / low side control signal outputted by the control unit (1) is fed back to the input end of the control unit (1) through the resistor R1, and the PWM control signal outputted by the control unit (1) is fed back to the input end of the control unit (1) through the resistor R2.

2. The fuel cell system control device with a self-diagnosis function according to claim 1, characterized by: The high / low side driving signal detection unit (6) and the PWM driving signal detection unit (7) are both provided with the photoelectric coupler (8), the input end of the photoelectric coupler (8) is connected with the forward diode D1 and the reverse diode D2, the input end of the photoelectric coupler (8) is also connected with the pull-up resistor R3 or the pull-down resistor R4, one end of the output end of the photoelectric coupler (8) is connected with the resistor R5, and the other end is grounded.

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