Method and device for controlling flat ground starting of vehicle and vehicle

Abstract

The invention discloses a method and device for controlling flat ground starting of a vehicle and the vehicle. The method includes the steps that accelerator pedal signals, brake pedal signals, the current engine rotating speed and hill signals of the vehicle are obtained; the target axle speed of a clutch is determined according to the accelerator pedal signals, the brake pedal signals, the current engine rotating speed and the hill signals, and the current axle speed of the clutch is further obtained; a target axle speed processing mode of the vehicle is determined according to the current axle speed of the clutch and the target axle speed of the clutch, and the target engine rotating speed corresponding to the target axle speed processing mode of the vehicle is obtained; and the increment of torque transmission of the clutch is worked out according to the current axle speed of the clutch, the target axle speed of the clutch, the accelerator pedal signals, the current engine rotating speed and the target engine rotating speed, and the clutch engaging position is determined according to the increment of torque transmission of the clutch. By means of the method, starting smoothness is improved, starting impact is reduced, abrasion to the clutch is lowered, and therefore user experience is improved.

Description

technical field [0001] The invention relates to the technical field of vehicles, in particular to a method and device for controlling a vehicle starting on level ground, and a vehicle. Background technique [0002] For vehicles equipped with automatic transmissions currently on the market, the control of starting on flat ground is one of the difficulties and cores in the control part of the entire automatic transmission. The control method mostly adopts the control strategy of constant engine speed. The requirements for medium control objectives include: good vehicle starting smoothness, small impact, and small sliding work. However, in the actual implementation stage, there are certain contradictions among the three control objectives, and each index cannot be completely optimized and designed to an excellent state. The starting driving intention of the working condition, because the output torque of the engine is affected by the size of the accelerator, if the clutch is e...

AI Technical Summary

Problems solved by technology

However, in the actual implementation stage, there are certain contradictions among the three control objectives, and each index cannot be completely optimized and designed to an excellent state. The starting driving intention of the working condition, because the output torque of the engine is affected by the size of the accelerator, if the clutch is engaged too quickly and the transmission torque is too large during the normal flat ground starting process, it will affect the smoothness of starting, resulting in a greater starting impact, and more serious It is the possibility of causing excessive fluctuations in engine speed, and even causing the engine to stall.

Conversely, if the excessive pursuit of reducing the coupling speed and coupling amount of the clutch in order to improve the smoothness of starting will cause the engine to boom and increase the sliding work, thereby reducing the effective service life of the clutch and reducing the starting quality. Vehicle Drivability

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