Vehicle and vehicle hill starting control method and hill starting control apparatus

Abstract

The invention discloses a vehicle and a vehicle hill starting control method and a hill starting control apparatus, wherein the method comprises: acquiring vehicle speed, an accelerator opening degree, engine rotation speed, clutch shaft speed, road slope and clutch output torque; calculating vehicle acceleration torque and vehicle resistance torque based on the clutch output torque, the road slope and the clutch shaft speed; calculating the target vehicle speed based on the road slope and the accelerator opening degree; calculating the target acceleration torque of a vehicle based on the difference value between the calculated target vehicle speed and the vehicle speed, the road slope and the accelerator opening degree; calculating the torque that an engine needs and the clutch target torque based on the target acceleration torque of the vehicle, the vehicle resistance torque and the engine rotation speed; and controlling the engine output torque to reach the torque that the engine needs and the clutch output torque reach the clutch target acceleration torque so as to make the vehicle speed reach the target vehicle speed and the vehicle acceleration torque reach the target acceleration torque of the vehicle, thus controlling the vehicle speed and the vehicle acceleration speed and rapidly realizing the intention of a driver.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a vehicle hill start control method, a vehicle hill start control device and a vehicle. Background technique [0002] For vehicles equipped with automatic transmissions in the related art, the hill start control method is usually based on starting on flat ground, using a constant speed strategy to control the engine, and an additional hill assist device, for example, ESP (Electronic Stability Program, electronic body stability system) , EPB (Electrical Park Brake, electronic parking brake system) or hand brake signal, so as to achieve the purpose of preventing the slope. [0003] However, the disadvantage of the hill start control method based on the constant engine speed as the control strategy in the related art is that the output of the engine torque is only based on the accelerator pedal, and the influence of the hill resistance is not considered. In this situation, it is d...

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Problems solved by technology

[0003] However, the disadvantage of the hill start control method based on the constant engine speed as the control strategy in the related art is that the output of the engine torque is only based on the accelerator pedal, and the influence of the hill resistance is not considered. In this situation, it is difficult for the driver to step on the accelerator pedal to a proper opening to generate a suitable torque, especially for novices. If the driver steps on the accelerator pedal to a small Step on the accelerator pedal to a larger opening, it is easy to accelerate too fast and knock down the vehicle in front

[0004] In addition, even if an additional ramp auxiliary device is added in the related art, it can only prevent the phenomenon of slipping, but cannot solve the phenomenon of excessive acceleration.

Especially in the case of a large slope, if the driver steps on the accelerator pedal to a small opening, the vehicle speed is likely to be zero, the vehicle neither moves forward nor reverses, and the clutch is in a state of wasted wear. The temperature will soon reach the protection threshold, and there will be no power output; if the driver steps on the accelerator pedal to a large opening, it is easy to cause excessive torque and excessive acceleration. At this time, in order to prevent excessive When approaching the vehicle in front, you have to step on the brake to stop, thus repeating the hill start action repeatedly, thereby reducing driver comfort and increasing unnecessary clutch wear

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