A hill start assist system and method for an automatic transmission

Abstract

The invention discloses a staring auxiliary system and method of an automatic gearbox ramp. The staring auxiliary system comprises an automatic gearbox control unit, a braking air chamber, a braking pedal, a vehicle air cylinder, a two-position two-way solenoid valve, a check valve, a first pressure switch, a second pressure switch and a tilt angle sensor; the two-position two-way solenoid valve, the check valve, the first pressure switch, the second pressure switch and the tilt angle sensor are electrically connected with the automatic gearbox control unit; the vehicle air cylinder is used for providing a braking air source for the braking air chamber; the braking pedal is used for controlling unblocking and blocking of a channel formed between the vehicle air cylinder and the braking air chamber; the two-position two-way solenoid valve is arranged on an air pressure pipeline which is arranged between the braking air chamber and the braking pedal; the two pressure switches are arranged between the braking air chamber and the two-position two-way solenoid valve and between the two-position two-way solenoid valve and the braking pedal respectively; the check valve is in air circuit parallel connection with the two-position two-way solenoid valve; the tilt angle sensor is independently arranged on a vehicle body or at the chassis bottom of an automobile; the two pressure switches are used for sending out the same signal when the braking pedal brakes and also used for sending out different signals when the braking pedal resets.

Description

technical field [0001] The invention belongs to the field of commercial vehicle automatic transmissions, and in particular relates to a novel automatic transmission ramp start assist system. Background technique [0002] Today's commercial vehicles are equipped with an obvious trend of automatic transmission systems. The original intention is to reduce the labor intensity of the driver driving the vehicle, reduce the difficulty of the driver's operation of the vehicle, and improve the comfort and safety of the vehicle. However, the application of traditional automatic transmissions in special environments is stretched, especially following cars on hills in cities. [0003] On ordinary commercial vehicles with manual transmission, experienced drivers often control the vehicle to start on a hill through the accelerator, brake, parking brake, and clutch. The slipping and grinding of the clutch is very difficult. Improper application will not only cause the vehicle to slide dow...

AI Technical Summary

Problems solved by technology

However, on heavy-duty, high-torque commercial vehicles, this approach will cause a large amount of heat to accumulate in the clutch, which often accelerates the wear of the clutch and may damage the clutch. The application range is limited

[0005] There are also some automatic transmission vehicles equipped with a vehicle auxiliary braking system to perform auxiliary braking on slope vehicles by controlling the wheel brakes, and cooperate with the slipping of the clutch to achieve the effect of assisting the start of the slope, but the cost is too high and requires assembly A higher-level auxiliary braking system needs to be calibrated with the automatic transmission, so it cannot be widely promoted

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