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Vehicle low-voltage power supply redundant loop based on functional safety, control method and vehicle

A functionally safe, low-voltage power supply technology, applied in circuit devices, vehicle components, emergency power supply arrangements, etc., can solve the problems of occupying available assembly space, increasing vehicle quality, and high safety risks, avoiding current loop problems, reducing costs, The effect of reducing the quality of the vehicle

Pending Publication Date: 2022-05-13
CHONGQING CHANGAN AUTOMOBILE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The power supply of each low-voltage controller of the vehicle is provided by a low-voltage power supply. The power supplement of the low-voltage power supply is generally provided by a generator or DCDC converter (DC-DC converter). When the output voltage of the DCDC converter or generator is unstable, or the low-voltage When the circuit is short-circuited or disconnected, the controller of the entire low-voltage circuit will not work normally, and the safety risk is high
[0003] The traditional power supply is a 12V low-voltage battery that supplies power to the entire low-voltage circuit. With the increasing application of intelligent driving technology in the vehicle, the requirements for the reliability and safety of the vehicle are getting higher and higher. Among them, the low-voltage system The security also puts forward higher security requirements. The publicity number CN112350429A of a redundant low-voltage power supply system patent for electric vehicles discloses a scheme to connect two energy storage devices in parallel to realize power redundancy, but the two energy storage devices The consistency of the equipment must be good, and it increases the mass of the vehicle and occupies the limited available assembly space of the vehicle

Method used

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  • Vehicle low-voltage power supply redundant loop based on functional safety, control method and vehicle
  • Vehicle low-voltage power supply redundant loop based on functional safety, control method and vehicle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The functional safety-based low-voltage power supply redundant circuit of the whole vehicle disclosed in the present invention includes an engine 01, a generator 02, a power protection device 03, a power monitoring device 04, a storage battery 07, a main power protection device 05, a slave power protection device 06, a main The loop branch 08 and the redundant loop branch 09 involve the safety parking controller 011 , the power controller 012 and the vehicle electrical appliance controller 010 .

[0033] The engine 01 drives the generator 02 to rotate, and the generator 02 charges the battery; a power protection device 03 is installed between the generator and the battery, and when the output of the generator is overvoltage or undervoltage, the power protection device 03 cuts off the gap between the generator and the battery 07 Connection.

[0034] A main power protection device 05 is set between the battery and the main circuit branch; a slave power protection device 0...

Embodiment 2

[0040] The functional safety-based low-voltage power supply redundant circuit of the vehicle disclosed in the present invention includes a power battery 01', a DCDC converter 02', a power protection device 03, a power monitoring device 04, a storage battery 07, a main power protection device 05, and a slave power protection device. Device 06, main circuit branch 08, redundant circuit branch 09, safety parking controller 011, power controller 012 and vehicle electrical appliance controller 010.

[0041] The power battery charges the battery through the DCDC converter; a power protection device 03 is installed between the DCDC converter and the battery; when the DCDC converter 02' outputs overvoltage or undervoltage, the power protection device 03 disconnects the DCDC converter 02' from the battery. 07 connection between.

[0042] A main power protection device 05 is set between the battery and the main circuit branch; a slave power protection device 06 is set between the batter...

Embodiment 3

[0048]The invention also discloses a method for controlling a redundant loop of a low-voltage power supply of a vehicle based on functional safety, which includes the following steps,

[0049] The power battery charges the battery through the DCDC converter;

[0050] When the output of the generator or the DCDC converter is overvoltage or undervoltage, the power protection device 03 disconnects the connection between the DCDC converter 02 ′ and the storage battery 07 .

[0051] After monitoring the battery problem state information, the power monitoring device 04 prompts the battery problem state through the CAN bus.

[0052] When working normally, the battery supplies power to the main circuit branch and the redundant circuit branch at the same time, the main power protection device and the slave power protection device are closed, and the safety parking controller, power controller and vehicle electrical controller are working normally;

[0053] When the main circuit fails,...

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PUM

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Abstract

The invention discloses a functional safety-based complete vehicle low-voltage power supply redundant loop and a control method, and the method comprises the steps: monitoring the loop voltage and current in real time to realize the on-off of a circuit, and switching on a switch by a power supply protection device when the loop voltage and current are between the set upper and lower limit thresholds; and when the loop voltage or current exceeds the set upper and lower limit thresholds, the power supply protection device disconnects the switch, and the main loop and the redundant loop are independent through the on-off of the power supply protection device. The design of two-path power redundancy is achieved for key parts of driving, when one path fails, the other path at least can guarantee safe parking of a vehicle, and the requirements for safety and reliability are met.

Description

technical field [0001] The invention belongs to the technical field of a redundant low-voltage power supply circuit of a vehicle based on functional safety, and in particular relates to a redundant circuit of a low-voltage power supply of a vehicle based on functional safety and a control method. Background technique [0002] The power supply of each low-voltage controller of the vehicle is provided by a low-voltage power supply. The power supplement of the low-voltage power supply is generally provided by a generator or DCDC converter (DC-DC converter). When the output voltage of the DCDC converter or generator is unstable, or the low-voltage When the circuit is short-circuited or disconnected, the controller of the entire low-voltage circuit will not work normally, and the safety risk is high. [0003] The traditional power supply is a 12V low-voltage battery that supplies power to the entire low-voltage circuit. With the increasing application of intelligent driving techn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60R16/033H02J9/06
CPCB60R16/033H02J9/061
Inventor 癿建建何文张鹏周宏伟庞迎春
Owner CHONGQING CHANGAN AUTOMOBILE CO LTD
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