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Vehicle electronic control unit ground connection and ground pressure difference detection circuit

A technology of difference detection circuit and control unit, applied in the direction of measuring electricity, measuring devices, measuring electrical variables, etc., can solve the problems of high cost, high failure rate of existing technology, complex circuit, etc., achieve low cost and improve fault diagnosis ability Effect

Inactive Publication Date: 2014-10-22
SHANGHAI AEROSPACE AUTOMOBILE ELECTROMECHANICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method needs to use a dedicated automotive-grade operational amplifier chip, and needs to protect the power input end of the operational amplifier chip against transient high voltage. The connection is good. When the system control power supply ground is open circuit and the high-power power supply ground is well connected, because the system control part cannot be powered on at this time, the detection circuit does not work, and the automotive electronic control unit cannot send the relevant fault information. High technical failure rate and poor practicability

Method used

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  • Vehicle electronic control unit ground connection and ground pressure difference detection circuit
  • Vehicle electronic control unit ground connection and ground pressure difference detection circuit

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Embodiment 1

[0023] Such as figure 1 As shown, a ground connection and ground differential detection circuit of an automotive electronic control unit includes a diode group D, a resistor divider network 2, a reference voltage Vref, and a capacitor C1. The anodes of the diode group D are respectively connected to the system control power supply ground GND1 and System control part 1, the cathode is connected to GND2 of the high-power power supply; the resistor divider network 2 is composed of a first resistor R1 and a second resistor R2 connected in series, the other end of the first resistor R1 is connected to the reference voltage Vref, and the other end of the second resistor R2 Connect to the high-power power supply ground GND2; the capacitor C1 is connected in parallel with the processor analog-to-digital conversion (ADC) module, one end is connected to the common connection end of R1 and R2, and the other end is connected to the system control power supply ground GND1. The capacitor C1...

Embodiment 2

[0026] Such as figure 2 As shown, in this embodiment, the diode group D is composed of two diodes D1 and D2 connected in series. When the GND1 of the system control power supply is open, the diodes D1, D2 and the GND2 of the high-power power supply provide a ground loop, so that the circuit of the system control part 1 can be powered on and work, and the ground pressure difference formed by R1 and R2 of the resistor divider network 2 The acquisition circuit can work normally. At this time, the sampling voltage connected to the ADC port of the processor is: V=[R2*Vref-R1*(GND1-GND2)] / (R1+R2), the voltage value is based on the system control power ground It is the voltage value of the reference ground. By reading the ADC reading, the voltage value of the ADC port can be converted, and then the voltage value of GND1-GND2 can be obtained through the above formula, that is, the voltage between the system control power supply ground GND1 and the high-power power supply ground GND2 ...

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Abstract

The invention relates to a vehicle electronic control unit (ECU) ground connection and ground pressure difference detection circuit. The detection circuit is connected to a system control part, a system control power ground GND1 and a high-power power ground GND2. The detection circuit comprises a diode group D, a resistive voltage division network, a reference voltage Vref, a capacitor C1, and an AD conversion module. The anode of the diode group D is connected between the system control part and the system control power ground GND1, and the cathode of the diode group D is connected with the high-power power ground GND2. The resistive voltage division network is composed of a first resistor R1 and a second resistor R2, one end of the first resistor R1 is connected with the reference voltage Vref, and the other end of the first resistor is connected with the high-power power ground GND2 through the resistor R2. One end of the capacitor C1 and the input end of the AD conversion module are connected between the first resistor R1 and the second resistor R2. Compared with the prior art, the vehicle electronic control unit ground connection and ground pressure difference detection circuit has the following advantages: the fault diagnosis capability of finished vehicles is improved, the cost is low, detection is accurate, and the like.

Description

technical field [0001] The invention relates to the technical field of automobile electronic control, in particular to a connection and ground pressure difference detection circuit of an automobile electronic control unit. Background technique [0002] Automotive electronic control units (ECUs) are widely used in automotive control systems. Cars supply power to ECUs through on-board batteries and generators. For some electronic control units with high-power drives (such as motor drives), two independent power supplies are often provided. , one system control power supply, one high-power power supply. [0003] For an automotive electronic control unit with two power supplies, the control system needs to detect the voltage difference between the two grounds and detect an open circuit fault. In the prior art, a commonly used method is to place an operational amplifier circuit in the system control circuit to sample the high-power ground voltage, and send the processed output t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/02G01R19/25
Inventor 孙国华刘锋
Owner SHANGHAI AEROSPACE AUTOMOBILE ELECTROMECHANICAL CO LTD