A self-test method for powering on an electric drive system

Abstract

The present invention discloses a self-test method for powering on an electric drive system, comprising the following steps: step 1: constructing a circuit; step 2: judging whether the power supply of a control end is normal by judging the KSI voltage and the reverse in step 1; step 3: judging whether the power supply of the control end is normal by detecting and judging the power output terminal B+ of the battery and the BUS voltage of the motor controller; step 4: giving a Drive1 signal, turning on a switch tube Q1, and closing a contactor; step 5: judging whether the contactor is closed; step 6: judging whether an instruction is accepted; step 7: when all the above judgment conditions are met, performing an enabling process of a Drive2 signal, and performing corresponding load work; the present invention can protect the electric drive system from startup hazards during the power-on process, and the present invention will not cause damage to system components of the electric drive system caused by non-compliant operations.

Description

Technical Field

[0001] The present invention relates to the technical field of electric drive systems, and in particular to a power-on self-test method for an electric drive system. Background Art

[0002] In the motor control system, since the entire vehicle system is powered by a battery, the current battery power supply system is mainly divided into power output and control output parts; the output of the power supply is detected by the control output part as a trigger condition, but there will be an output control valve at the power output end, and under certain circumstances, the power end will not be powered; at this time, if the electric drive system receives a power load instruction, the power output of the power supply is not established, and the power supply of the entire vehicle is provided by the control output part, which will cause damage to the pre-charging circuit components of the control part.

[0003] Therefore, it is a problem worthy of research to provide a method for self-checking the power supply of an electric drive system, which can protect the electric drive system from startup hazards during the power-on process and will not cause damage to system components caused by improper operation of the electric drive system. Summary of the Invention

[0004] The purpose of the present invention is to provide an electric drive system power-on self-test method that can protect the electric drive system from startup hazards during power-on and will not cause damage to system components caused by improper operation of the electric drive system.

[0005] The object of the present invention is achieved like this:

[0006] A method for self-testing an electric drive system after powering on comprises the following steps:

[0007] Step 1: Constructing an electric drive system power supply startup circuit, which includes a voltage sampling module, a main power operation module, a contactor operation and current feedback module, and a vehicle action module;

[0008] Step 2: Determine whether the control end power supply is normal by judging the KSI voltage and reverse voltage in step 1. The specific method for determining whether the control end power supply is normal is to sample the voltage and compare it with the reference value V1 designed inside the MCU. If it meets the original design judgment requirements, it is judged as passed.

[0009] Step 3: If the control end power supply is normal in step 2, then the battery power output terminal B+ and the BUS voltage of the motor controller are tested to determine the source of the fault and distinguish whether it is damage to the electronic control terminal or the battery terminal;

[0010] Make corresponding fault judgment based on the internal judgment of the MCU module;

[0011] When VB+>V2, VBUS≤V3, the electronic control reports a pre-charge circuit failure.

[0012] When VB+≤V2,VBUS>V3, the electronic control reports a battery power output failure;

[0013] VB+ represents the battery power output voltage, V2 represents the VB+ judgment reference voltage given in the software, VBUS represents the electric control bus capacitor voltage, and V3 represents the VBUS judgment reference voltage given in the software;

[0014] Step 4: Given the Drive1 signal, turn on the switch Q1 and close the contactor. When both the VB+ and VBUS signals meet the conditions, turn on the switch Q1. This is to connect the main power circuit and connect the battery power output to the electronic control BUS terminal.

[0015] Step 5: Determine whether the contactor is closed. When VBUS and VB+ are equal and VI is greater than V4, the contactor is closed.

[0016] If the above conditions are not met, the electric control contactor fault will be reported; to determine whether the main contactor is energized and whether the battery power output has been connected to the electric control BUS;

[0017] Step 6: Determine whether the command is accepted. The command is a signal command, which is a voltage signal. When the MCU receives the voltage signal, it will determine that the command has been received.

[0018] Step 7: When all the above judgment conditions are met, that is, VKSI>V1, VB+>V2, VBUS>V3, VBUS=VB+, VI>V4, the Drive2 signal is enabled and the corresponding load work is performed. Step 7 is mainly for load work.

[0019] In step 1, the voltage sampling module includes sampling circuit 1, sampling circuit 2 and sampling circuit 3, which perform voltage sampling of each module and provide the sampling signal to the MCU;

[0020] Sampling circuit 1 is connected to the battery signal power supply and the MCU; sampling circuit 2 is connected to the battery signal power supply and the MCU; sampling circuit 3 is connected to the battery signal power supply and the MCU.

[0021] In step 1, the main power working module includes a battery, a pre-charging circuit, a contactor and a load. The battery is connected to the electric control bus through the pre-charging circuit and the contactor. The direct current is converted into alternating current through the inverter circuit inside the electric control and connected to the load circuit; the main power module is used to perform the inverter function, and the main power module is connected to the load, the contactor and the pre-charging circuit.

[0022] In step 1, the contactor operation and current feedback module includes a battery, a switch tube Q1, a resistor R1, and a signal amplification circuit. The contactor operation is to connect the battery to the electronic control BUS end; the contactor operation and current feedback module are connected to the battery, the electronic control BUS end, and the Q1 switch tube in the circuit.

[0023] In step 1, the vehicle action module includes a load instruction receiving circuit, an MCU module, a Q1 tube enable signal Drive1, a load drive circuit enable signal Drive2, and a load drive circuit. The load instruction receiving circuit serves as a sampling circuit for receiving load instructions, the MCU module serves as the control and judgment center of the system, and the load drive circuit serves as a drive processing circuit for the load circuit; the load instruction receiving circuit is connected to the load, and the vehicle action module is connected to the MCU module.

[0024] The beneficial effects of the present invention are: the present invention can protect the electric drive system from startup hazards during the power-on process, and the present invention will not cause damage to system components of the electric drive system due to non-compliant operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a flow chart of the present invention;

[0026] Figure 2 It is a structural schematic diagram of the present invention. Implementation Method

[0027] The present invention will be further described below with reference to the accompanying drawings and examples.

[0028] like Figure 1 and Figure 2 As shown, a method for self-testing the power supply of an electric drive system includes the following steps:

[0029] Step 1: Construct an electric drive system power supply startup circuit, which includes a voltage sampling module, a main power operation module, a contactor operation and current feedback module, and a vehicle action module.

[0030] The voltage sampling module includes sampling circuit 1, sampling circuit 2 and sampling circuit 3. The functions of sampling circuit 1, sampling circuit 2 and sampling circuit 3 are to sample the voltage of each module and provide the sampling signal to the MCU; sampling circuit 1 is connected to the battery signal power supply and MCU; sampling circuit 2 is connected to the battery signal power supply and MCU; sampling circuit 3 is connected to the battery signal power supply and MCU.

[0031] The main power module includes a battery, a pre-charging circuit, a contactor, and a load. The battery is connected to the electronic control busbar through the pre-charging circuit and contactor. The electronic control internally converts direct current into alternating current through an inverter circuit and connects it to the load circuit. The main power module's main function is to perform the inverter function and is primarily connected to the load, contactor, and pre-charging circuit.

[0032] In step 1, the contactor operation and current feedback module includes a battery, a switch tube Q1, a resistor R1, and a signal amplification circuit. The contactor operation is to connect the battery to the electronic control BUS end; the contactor operation and current feedback module are mainly connected to the battery, the electronic control BUS end, and the Q1 switch tube in the circuit.

[0033] In step 1, the vehicle action module includes a load instruction receiving circuit, an MCU module, a Q1 tube enable signal Drive1, a load drive circuit enable signal Drive2, and a load drive circuit. The load instruction receiving circuit serves as a sampling circuit for receiving load instructions, the MCU module serves as the control and judgment center of the system, and the load drive circuit serves as a drive processing circuit for the load circuit; the load instruction receiving circuit is connected to the load, and the vehicle action module is connected to the MCU module.

[0034] Step 2: Determine whether the power supply to the control end is normal by judging the KSI voltage and reverse voltage in step 1. The specific method for determining whether the power supply to the control end is normal is to perform voltage sampling and compare it with the reference value V1 designed inside the MCU. If it meets the original design judgment requirements, it is judged to be passed.

[0035] Step 3: If the control end power supply is normal in step 2, then the battery power output terminal B+ and the motor controller BUS voltage are tested to determine the source of the fault and distinguish whether it is damage to the electronic control terminal or the battery terminal.

[0036] Make corresponding fault judgment based on the internal judgment of the MCU module;

[0037] When VB+>V2, VBUS≤V3, the electronic control reports a pre-charging circuit failure;

[0038] When VB+≤V2,VBUS>V3, the electronic control reports a battery power output failure;

[0039] Among them, VB+ represents the battery power output voltage, V2 represents the VB+ judgment reference voltage given in the software, VBUS represents the electric control bus capacitor voltage, and V3 represents the VBUS judgment reference voltage given in the software.

[0040] Step 4: Given the Drive1 signal, turn on the switch Q1 and close the contactor. When both the VB+ and VBUS signals meet the conditions, turn on the switch Q1. This is to connect the main power circuit and connect the battery power output to the electronic control BUS terminal.

[0041] Step 5: Determine whether the contactor is closed. When VBUS and VB+ are equal and VI is greater than V4, the contactor is closed.

[0042] If the above conditions are not met, the electric control contactor fault will be reported; the technical purpose is to determine whether the main contactor is energized and whether the battery power output is connected to the electric control BUS.

[0043] Step 6: Determine whether the instruction is accepted. The instruction is a signal instruction, which is a voltage signal. When the MCU receives the voltage signal, it will determine that the instruction is received.

[0044] Step 7: When all the above conditions are met, that is, when VKSI>V1, VB+>V2, VBUS>V3, VBUS=VB+, and VI>V4 in the flowchart, the Drive2 signal is enabled and the corresponding load operation is performed. Step 7 mainly performs load operation.

[0045] The present invention can protect the electric drive system from startup hazards during the power-on process, and the present invention will not cause damage to system components of the electric drive system due to non-compliant operations.

Claims

1. A method for self-testing an electric drive system upon powering on, characterized in that: The following steps are involved: Step 1: Constructing an electric drive system power supply startup circuit, which includes a voltage sampling module, a main power operation module, a contactor operation and current feedback module, and a vehicle action module; Step 2: Determine whether the control end power supply is normal by judging the KSI voltage and reverse voltage in step 1. The specific method for determining whether the control end power supply is normal is to sample the voltage and compare it with the reference value V1 designed inside the MCU. If it meets the original design judgment requirements, it is judged as passed. Step 3: If the control end power supply is normal in step 2, then the battery power output terminal B+ and the BUS voltage of the motor controller are tested to determine the source of the fault and distinguish whether it is damage to the electronic control terminal or the battery terminal; Make corresponding fault judgment based on the internal judgment of the MCU module; When VB+>V2, VBUS≤V3, the electronic control reports a pre-charge circuit failure. When VB+≤V2,VBUS>V3, the electronic control reports a battery power output failure; Wherein, VB+ represents the battery power output voltage, V2 represents the VB+ judgment reference voltage given in the software, VBUS represents the electric control bus capacitor voltage, and V3 represents the VBUS judgment reference voltage given in the software; Step 4: Given the Drive1 signal, turn on the switch Q1 and close the contactor. When both the VB+ and VBUS signals meet the conditions, turn on the switch Q1. This is to connect the main power circuit and connect the battery power output to the electronic control BUS terminal. Step 5: Determine whether the contactor is closed. That is, when VBUS and VB+ are equal and VI is greater than V4, the contactor is closed. If the above conditions are not met, the electric control contactor fault will be reported; to determine whether the main contactor is energized and whether the battery power output has been connected to the electric control BUS; Step 6: Determine whether the command is accepted. The command is a signal command, which is a voltage signal. When the MCU receives the voltage signal, it will determine that the command has been received. Step 7: When all the above judgment conditions are met, that is, VKSI>V1, VB+>V2, VBUS>V3, VBUS=VB+, VI>V4, the Drive2 signal is enabled and the corresponding load work is performed. Step 7 is mainly for load work.

2. The method for self-testing the electric drive system after power on according to claim 1, characterized in that: In step 1, the voltage sampling module includes sampling circuit 1, sampling circuit 2 and sampling circuit 3, which perform voltage sampling of each module and provide the sampling signal to the MCU; Sampling circuit 1 is connected to the battery signal power supply and the MCU; sampling circuit 2 is connected to the battery signal power supply and the MCU; sampling circuit 3 is connected to the battery signal power supply and the MCU.

3. The method for self-testing the electric drive system after power on according to claim 1, characterized in that: In step 1, the main power working module includes a battery, a pre-charging circuit, a contactor and a load. The battery is connected to the electric control bus through the pre-charging circuit and the contactor. The direct current is converted into alternating current through the inverter circuit inside the electric control and connected to the load circuit; the main power module is used to perform the inverter function, and the main power module is connected to the load, the contactor and the pre-charging circuit.

4. The method for self-testing the electric drive system after power on according to claim 1, characterized in that: In step 1, the contactor operation and current feedback module includes a battery, a switch tube Q1, a resistor R1, and a signal amplification circuit. The contactor operation is to connect the battery to the electronic control BUS end; the contactor operation and current feedback module are connected to the battery, the electronic control BUS end, and the Q1 switch tube in the circuit.

5. The method for self-testing the electric drive system after power on according to claim 1, characterized in that: In step 1, the vehicle action module includes a load instruction receiving circuit, an MCU module, a Q1 tube enable signal Drive1, a load drive circuit enable signal Drive2, and a load drive circuit. The load instruction receiving circuit serves as a sampling circuit for receiving load instructions, the MCU module serves as the control and judgment center of the system, and the load drive circuit serves as a drive processing circuit for the load circuit; the load instruction receiving circuit is connected to the load, and the vehicle action module is connected to the MCU module.

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