Lorry automatic gearbox crawling control system based on clutch target torque

Abstract

The invention discloses a lorry automatic gearbox crawling control system based on clutch target torque, which comprises the clutch synchronic examination sub-module, a vehicle sliding examination sub-module, and a clutch overheating examination sub-module. TCU utilizes the crawling control to vehicle according to the output signals of each sub-module. The crawling control to vehicle of TUC comprises the crawling control mode in waiting state, in the mixed accelerator state, in the mandatory junction state and in synch state. The switches of various control modes are up to the current vehicle state. Target speed (TS) of engine and clutch target position (ICP) in different vehicle state can be gained by the crawling control to vehicle of TCU. The method can meet the crawling control demands in various vehicle working conditions, protect clutch as much as possible and give drivers the maximum controllability of vehicle crawling.

Description

technical field [0001] The invention belongs to the technical field of automobile transmission control, in particular to a creep control system of an automatic transmission (AMT) for heavy trucks based on a clutch target torque. Background technique [0002] For heavy-duty trucks, there are often working conditions that require low-speed crawling (vehicle speed <5km / h), such as docking platforms / trailers, moving vehicles into storage and other working conditions. Under these operating conditions, engine torque and clutch position control need to be well matched to meet the following objectives: [0003] (1) Stable and direct clutch semi-engagement control to achieve sensitive and controllable vehicle speed control performance [0004] (2) Engine torque control that can cooperate with the clutch load to meet the power demand of the vehicle under heavy load [0005] (3) Be able to cope with various road conditions and ensure the safety of the vehicle [0006] (4) Allow t...

AI Technical Summary

Problems solved by technology

[0008] In the prior art, the conventional engine-clutch control mode of the automatic transmission AMT is to control the clutch and the engine relatively independently, and the coordinated control between the clutch position control and the engine torque cannot be realized, and the torque of the clutch at different positions is not considered. Sensitivity, and the driver cannot be given enough prompt time and information on the degree of overheating before the clutch overheating protection, so the above requirements cannot be met at the same time

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