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Crawling torque output control method and device, and automobile

A technology of torque output and control method, which is applied in the direction of control devices, electric vehicles, control drives, etc. It can solve the problems of long time for manual control to release the brake pedal, lagging response of creeping torque, and vehicle slippage, etc., so as to avoid adverse effects , speed up response and save cost

Active Publication Date: 2018-06-08
SAIC MOTOR
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  • Application Information

AI Technical Summary

Problems solved by technology

According to the actual test results of the vehicle creep start, it takes about 1.5s from the time the driver releases the brake pedal to the time when the brake pedal is fully released. Torque response lags about 1.5s
[0006] Further, if the vehicle crawls and starts on a slope with a certain slope, it is easy to cause the vehicle to slide
This is because, during the period when the response of the creep torque is lagging, the motor does not output the creep torque, and the vehicle has no power to move forward. Affected by the acceleration of gravity, it is easy to slip back when starting on a slope, and even Collision with the car behind when the backsliding distance is too long

Method used

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  • Crawling torque output control method and device, and automobile
  • Crawling torque output control method and device, and automobile
  • Crawling torque output control method and device, and automobile

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Embodiment Construction

[0039] As mentioned above, in the starting stage of the vehicle, new energy vehicles are mostly driven by motors. When the motor-driven vehicle is running in creep mode, the torque output method is as follows: after the brake pedal is released, the motor outputs a preset value according to the current vehicle speed. Set the creep torque to drive the vehicle into creep. Wherein, for the same vehicle speed, the motor outputs the same creep torque. However, the above-mentioned creep torque output method will cause the creep torque response to lag, and if the vehicle creeps and starts on a slope with a certain slope, the vehicle is prone to slide downhill.

[0040] The inventor of the present invention has found through research that the key to the above problem is that in the prior art, the motor does not output creep torque during the period from when the driver releases the brake pedal to when it is fully released, resulting in no forward power of the vehicle.

[0041] In the ...

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Abstract

The invention provides a crawling torque output control method and device, and an automobile. The method comprises the following steps of during starting, detecting the change state of braking main cylinder pressure; responding to the condition that the braking main cylinder pressure starts to decrease, outputting a crawling torque target value. By using the scheme, when the automobile starts, theinterval time from the crawling operation started by a driver to the crawling torque outputted by a motor can be shortened, so that the crawling torque response speed can be accelerated.

Description

technical field [0001] The invention relates to the field of automobile power control, in particular to a creep torque output control method and device, and an automobile. Background technique [0002] With the increasingly serious energy crisis and environmental pollution problems worldwide, the demand for energy saving and emission reduction of automobiles is also increasing. New energy vehicles have received more and more attention because of their characteristics of alleviating energy pressure and reducing environmental pollution. [0003] New energy vehicles include electric vehicles and hybrid vehicles. At the initial stage of the vehicle, they are mostly driven by electric motors. If the driver does not step on the accelerator pedal, they will enter creep mode. Specifically, creep mode is used to indicate the vehicle's ability to slow down on its own after the brake pedal is released while the vehicle is in forward or reverse gear. [0004] In the prior art, when a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60L15/20
CPCB60L15/2072B60L2240/423B60L2250/26Y02T10/72
Inventor 严洪江李文博邱巍俞开元
Owner SAIC MOTOR
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