Low-speed control method and device for commercial vehicle matched with AMT and equipment

Abstract

The invention discloses a low-speed control method and device for a commercial vehicle matched with an AMT and equipment. The method comprises the steps that whether the vehicle is in a low-speed coupling control interval or not is determined; an expected engine net output torque and an available engine friction torque are calculated; according to the expected engine net output torque and the available engine friction torque, whether an actuator is enabled to be driven or not is determined, and whether the vehicle is in a driving state or not is determined; if it is determined that the actuator is enabled to be driven, when the vehicle is in the low-speed coupling control interval and the vehicle is in the driving state, low-speed compensation torque is calculated, and engine request torque is obtained according to the low-speed compensation torque, engine friction torque and expected engine net output torque; and when the vehicle is not in the low-speed coupling control interval and is in the driving state, the engine request torque is the sum of the expected engine net output torque and the engine friction torque, good control over low-speed running of the vehicle matched with the AMT is achieved, starting and stopping are reduced, and riding comfort is improved.

Description

technical field [0001] The present application relates to the technical field of automatic driving, and in particular to an AMT-matched commercial vehicle low-speed control method, device and computer equipment. Background technique [0002] The current full-speed adaptive cruise ACC is either developed based on a pure electric model, or a passenger car matching an AT gearbox. Pure electric vehicles generally have no gearbox, and the linearity of motor control is good, and it is relatively easy to control at low speeds. The passenger car matching AT has a flexible connection of the hydraulic torque converter, which can maintain continuous power transmission at low speeds. For commercial vehicles matching AMT, due to its rigid mechanical connection structure with limited gears, when the vehicle speed is low, the gearbox will control the clutch to be in a semi-engaged state in order to ensure that the engine speed is not lower than the idle speed. The control unit of the AMT...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of this application is to provide an AMT commercial vehicle low-speed control method, device and computer equipment, aiming to solve the problem of limited gears for vehicles equipped with AMT gearboxes. The rigid mechanical connection structure, when the vehicle speed is low, the AMT control unit will limit the engine torque, which brings great difficulty to the control of the vehicle at low speed, and is prone to technical problems of frequent starting and stopping

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