Method for preventing load change impacts in a motor vehicle
AssigneeVolkswagen Aktiengesellschaft
InventorsEdgar Bothe, Wolfgang Schreiber
Life of this patent
Estimating the term…
Abstract
Load change impacts in a motor vehicle, especially as a result of abrupt changes in the position of the accelerator pedal, are prevented with the novel method. At least one dual clutch mechanism is provided between the drive engine and the gearbox. The gearbox has several selectable gear steps and the clutch is controlled in relation to the torque that is to be transmitted. The driving comfort is improved by controlling the clutch during the starting process of the motor vehicle and/or the gear steps are engaged during the starting process of the vehicle in such a way that the speed of rotation of the gear input shaft is lower than the idling speed of rotation of the engine.
Claims15
A method for preventing load change impacts in a motor vehicle, the motor vehicle having at least one clutch between a drive engine and a transmission, and the transmission having a plurality of selectively engageable gear speeds, and the clutch being actuated with respect to a torque to be transmitted, the method which comprises:
- during a starting process of the motor vehicle, actuating the clutch and/or engaging the gear speeds in the transmission, such that a transmission input shaft speed lies below an engine idling speed;
- and
- when a predetermined difference in rotational speed is reached, where a specific transmission input shaft speed is reached, switching the transmission to a next higher gear speed.
A method for preventing load change impacts in a motor vehicle, the motor vehicle having at least one clutch between a drive engine and a transmission, and the transmission having a plurality of selectively engageable gear speeds, and the clutch being actuated with respect to a torque to be transmitted, the method which comprises:
- during a braking or coasting process of the motor vehicle, actuating the clutch and/or engaging the gear speeds in the transmission, such that a transmission input shaft speed lies below an engine idling speed;
- and
- shifting the transmission from a currently engaged, old gear speed into a new, next-lower gear speed if, after a corresponding synchronization, a specific transmission input shaft speed is reached with a correspondingly engaged new gear speed, so that a predetermined difference in rotational speed with respect to the engine idling speed is present.
Dependencies are inferred from the claim text.