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Safety control system and safety controller in failure mode of vehicle electric drive system

A safety controller, electric drive system technology, applied in the control system, AC motor control, electrical components and other directions, can solve the problems of high voltage at the positive and negative terminals of the battery, damage to the capacitor CDC and battery, etc., to reduce short-circuit current and solve driving problems. Impact problems, the effect of improving safety and drivability

Active Publication Date: 2016-01-20
UNITED AUTOMOTIVE ELECTRONICS SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method, although the capacitive characteristics of the capacitor CDC and the battery can be used to feed back the electric energy to the capacitor CDC and the battery, but when the motor speed is high, the back electromotive force of the motor is also high, and the continuous current control for a long time will cause The overcharging of the capacitor CDC and the battery will cause the voltage between the positive and negative terminals of the battery to be too high, and even damage the capacitor CDC and the battery

Method used

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  • Safety control system and safety controller in failure mode of vehicle electric drive system
  • Safety control system and safety controller in failure mode of vehicle electric drive system
  • Safety control system and safety controller in failure mode of vehicle electric drive system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The safety control system in the failure mode of the vehicle electric drive system. The electric drive system includes a battery, a three-phase bridge inverter, and a three-phase drive motor. The three-phase bridge inverter converts the DC output from the battery into a three-phase AC. Drive the three-phase drive motor; the safety control system includes a motor speed sensor, a motor speed sensor state diagnostic device, a battery voltage sampling circuit, and a safety controller;

[0064] The motor speed sensor is used to detect the speed of the drive motor of the electric drive system;

[0065] The motor speed sensor state diagnostic device is used to detect the state of the motor speed sensor;

[0066] The battery voltage sampling circuit is used to detect the voltage between the positive and negative terminals of the battery of the vehicle electric drive system;

[0067] The safety controller is used to respectively output safety control signals to the power switch...

Embodiment 2

[0083]Based on Embodiment 1, the safety control system under the failure mode of the vehicle electric drive system also includes a gear position sensor, a wheel speed sensor, and an engine speed sensor;

[0084] Gear position sensor, used to collect the gear position of the transmission and output it to the safety controller;

[0085] The wheel speed sensor is used to collect the rotation speed of the wheel and output it to the safety controller;

[0086] The engine speed sensor is used to collect the engine speed and output it to the safety controller;

[0087] In step 2, if the state of the motor speed sensor is faulty, the safety controller determines the current driving motor speed according to the position of the motor in the vehicle topology, and then proceeds to step 3. The method for determining the current driving motor speed is:

[0088] If the drive motor is connected to the reducer or transmission, the safety controller determines the current drive motor speed acc...

Embodiment 3

[0091] Based on Embodiment 1, the three-phase bridge inverter such as figure 1 As shown, it includes the first power switch tube S1, the second power switch tube S2, the third power switch tube S3, the fourth power switch tube S4, the fifth power switch tube S5, the sixth power switch tube S6, the first reverse Freewheeling diode D1, second reverse freewheeling diode D2, third reverse freewheeling diode D3, fourth reverse freewheeling diode D4, fifth reverse freewheeling diode D5, sixth reverse freewheeling diode D6, Capacitor CDC, conduction drive circuit; power switch tube can use power transistor (GTR), gate turn-off thyristor (GTO), power field effect transistor (PowerMOSFET), insulated gate bipolar transistor (IGBT), integrated gate switch Thyristor (IGCT), symmetrical gate commutated thyristor (SGCT), etc.;

[0092] The first power switch tube S1, the third power switch tube S3, the fifth power switch tube S5, the first reverse freewheeling diode D1, the third reverse f...

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Abstract

The invention discloses a safety control system for a vehicular electric driving system in a failure mode. The safety control system is used for outputting a safety control signal to the control end of each power switch tube of upper and lower bridge arms of a three-phase bridge type inverter according to voltage between the positive and negative ends of a storage battery, the rotating speed of a driving motor and the state of a motor rotating speed sensor respectively. The invention also discloses a safety controller. According to the safety control system and the safety controller, the storage battery and a capacitor connected in parallel with the two ends of the storage battery can be prevented from being charged in the failure mode of the electric driving system, the demagnetization of the driving motor and damage to an electronic device are avoided, and driving impact is avoided.

Description

technical field [0001] The invention relates to new energy vehicle technology, in particular to a safety control system and a safety controller in a failure mode of a vehicle electric drive system. Background technique [0002] In a pure electric or hybrid vehicle, the electric drive system is mainly composed of a drive motor, an inverter and a battery. Among them, most of the drive motors are three-phase AC motors with high power density and high control efficiency. The inverter corresponds to it, usually using a three-phase bridge inverter, such as a three-phase bridge inverter figure 1 As shown, it includes the first power switch tube S1, the second power switch tube S2, the third power switch tube S3, the fourth power switch tube S4, the fifth power switch tube S5, the sixth power switch tube S6, the first reverse Freewheeling diode D1, second reverse freewheeling diode D2, third reverse freewheeling diode D3, fourth reverse freewheeling diode D4, fifth reverse freewhe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06
Inventor 郝强高智张东海
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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