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Hybrid car downhill auxiliary braking exiting method based on subjective intention and safety

A technology for hybrid electric vehicles and auxiliary braking, which is applied in hybrid electric vehicles, motor vehicles, transportation and packaging, etc., and can solve problems such as discrepancies in driver's subjective intentions

Active Publication Date: 2013-08-14
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These situations obviously do not match the subjective intention of the driver

Method used

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  • Hybrid car downhill auxiliary braking exiting method based on subjective intention and safety
  • Hybrid car downhill auxiliary braking exiting method based on subjective intention and safety
  • Hybrid car downhill auxiliary braking exiting method based on subjective intention and safety

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Embodiment Construction

[0049] The method of the present invention will be specifically described below in conjunction with the accompanying drawings and embodiments.

[0050] The invention mainly studies the exit strategy of the slope safety auxiliary braking system when the driver has an acceleration intention and the exit strategy when the driver has a braking intention.

[0051] 1. Auxiliary braking exit strategy for drivers with acceleration intention

[0052] The exit strategy of the driver's intention to accelerate mainly solves the problem that the brake controller can respond to the driver's acceleration demand after receiving the signal that the accelerator pedal opening is not zero, and cannot completely exit the assist system immediately after receiving the accelerator pedal signal. braking such that the vehicle accelerates uncontrollably by the driver.

[0053] From the driving equation (1) of the vehicle, the force formula (2) of the vehicle under the auxiliary braking torque, and the ...

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Abstract

The invention discloses a hybrid car downhill auxiliary braking exiting method based on a subjective intention and safety. The method includes an auxiliary braking exiting strategy under an acceleration intention and an auxiliary braking exiting strategy under a braking intention. When an acceleration pedal signal is found, the acceleration a of the car on a flat road and corresponding to the openness of an acceleration pedal is calculated. When a<=0, the auxiliary braking torque does not exit. When a>0, the auxiliary braking torque exits gradually according to the principle that first hydraulic braking exits, then motor braking exits and finally engine braking exits. When a braking pedal signal is found, the braking torque of a braking pedal is gradually increased and Tsum is reduced simultaneously before the total auxiliary braking torque Tsum becomes zero, the total braking torque is kept unchanged, and car speed is not changed. After the Tsum is zero, the braking torque of the braking pedal is gradually increased, and the total braking torque is increased. The auxiliary braking exiting strategies under the acceleration intention and the braking intention are considered, and great safety is achieved.

Description

technical field [0001] The invention relates to vehicle downhill auxiliary braking control technology, in particular to an exit method of hybrid electric vehicle downhill auxiliary braking. Background technique [0002] Downhill auxiliary braking of hybrid electric vehicles means that when the vehicle is sliding downhill, the vehicle controller actively brakes to ensure that the vehicle speed does not increase during the sliding process. However, in the process of auxiliary braking, in the state of large braking torque, if the controller receives the signal that the driver has an acceleration intention (the opening of the accelerator pedal is not zero) and then directly exits the auxiliary braking, with the auxiliary braking torque If the driver suddenly exits all of them, the vehicle may experience instantaneous acceleration that the driver cannot control, causing danger; When the braking torque corresponding to the brake pedal pressed by the driver is less than the auxili...

Claims

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Application Information

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IPC IPC(8): B60W10/188B60W10/08B60W10/06B60W20/00B60W30/02
CPCY02T10/6286Y02T10/62
Inventor 罗禹贡韩云武李克强连小珉郑四发杨殿阁王建强
Owner TSINGHUA UNIV
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