Control method and system of vehicle range extension device

Abstract

The invention provides a control method and system of a vehicle range extension device and belongs to the field of vehicles. The control method includes the following steps that a vehicle control unitdivides fault levels according to the orders of severity of faults happening to a vehicle and sending the fault levels to a CAN bus; a range extension device controller reads information of the faultlevels, the vehicle speed and the need state of the range extension device on the CAN bus; and the range extension device controller responds to different control strategies according to the above information so as to control the range extension device to execute corresponding actions, wherein the control strategies comprise the passive control strategy passively responding to a command of the vehicle control unit and the active control strategy actively sent out by the range extension device controller when the fault level is high. The invention further provides the corresponding control system. By the adoption of the control method and system, responses to the different control strategies can be made according to the orders of severity of the faults happening to the vehicle, the range extension device is effectively controlled in time to be safely stopped or powered off, and potential safety hazards are avoided.

Description

technical field [0001] The invention relates to the field of vehicles, in particular to a control method and system for a vehicle range extender. Background technique [0002] In order to improve the battery life of electric vehicles, range-extending electric vehicles equipped with range-extending devices have attracted widespread attention and quickly gained popularity in the market. However, in extended-range electric vehicles, the driving power often requires high-voltage power. When the vehicle breaks down or collides, the high-voltage power supply will seriously affect the safety of the vehicle and personnel. [0003] In the prior art, when the range-extending vehicle breaks down, generally its control system can only passively accept the control of the vehicle controller, that is, when the vehicle fails, if the range-extending device is generating power at this time, it is necessary to wait for the vehicle to The controller issues a shutdown / power-off request for the ...

AI Technical Summary

Problems solved by technology

However, in extended-range electric vehicles, the driving power often requires high-voltage power. When the vehicle breaks down or collides, the high-voltage power supply will seriously affect the safety of the vehicle and personnel.

[0003] In the prior art, when a range-extended vehicle fails, generally its control system can only passively accept the control of the vehicle controller, that is, when the vehicle fails, if the range-extending device is generating power at this time, it is necessary to wait for the vehicle to The controller issues a shutdown / power-off request for the range-extending device, and the potential safety hazard can only be eliminated after the range-extending device responds to the command

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