Control device and method for controlling vehicle powertrain to overcome, or avoid, cog to cog condition, computer program, computer-readable medium and vehicle

Abstract

A control device (100) and a method for controlling a vehicle powertrain (3) to overcome, or avoid, a cog to cog condition during gear shifting is provided. The method comprises, when an input shaft (10) of the gearbox (4) is rotating, controlling a synchromesh arrangement (40) so as to induce a 5 difference in rotational speed between a first gear wheel (12A, 13A, 14A) and a first coupling sleeve (16, 17) arranged to lock the first gear wheel to a main shaft (30) of the gearbox by at least partly engaging the first gear wheel (14A) or a second gear wheel (14A', 15A) to the input shaft (10). Furthermore, a computer program, a computer readable medium and a vehicle (1) are provided.

Description

technical field [0001] The present disclosure generally relates to a method for controlling a vehicle powertrain and a control device configured to control a vehicle powertrain. The present disclosure generally also relates to a computer program and a computer readable medium. Furthermore, the present disclosure generally relates to a vehicle. Background technique [0002] The vehicle is driven forward by propulsion unit torque generated by a propulsion unit in the vehicle, such as a combustion engine. This propulsion unit torque is transmitted through the vehicle's powertrain to the vehicle's drive wheels. In addition to the propulsion unit, the powertrain includes a gearbox adapted to selectively transmit torque between the propulsion unit and the drive wheels in different gear ratios. [0003] When shifting gears in a gearbox, the cogs are usually engaged and locked to the shaft by an axially displaceable coupling sleeve. Such coupling sleeves generally comprise cogs ...

AI Technical Summary

Problems solved by technology

A lower angular velocity difference increases the time spent in this state

This problem is especially acute when trying to engage the starter gear used to start the propulsion of the vehicle, since in this case the difference in angular velocity can be zero for a long time due to the vehicle being at rest

This in turn leads to an infinitely long engagement time if no action is taken

[0005] In addition to the fact that slow shifting may affect the handling of the vehicle, slow shifting performance may also cause irritation and thus discomfort to the driver of the vehicle

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