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1. 发明授权

US11040718B2 Launch control method for a vehicle 有权
公开(公告)号：US11040718B2
公开(公告)日：2021-06-22
申请号：US16648971
申请日：2018-09-17
申请人： Perkins Engines Company Limited
发明人： Michael Beyer , Michael Cronin , Steven Spencer , Matthew Mauritzson , Kevin Stutzman
IPC分类号： B60W10/02 , B60W30/18 , B60W10/101 , B60W10/18 , B60W30/186
摘要： A launch control method is provided for a vehicle having an accelerator, a brake and a continuously variable transmission (CVT). The method comprises determining: (i) a braking torque set by a vehicle operator by pressing a brake pedal of the vehicle; and (ii) a holding torque required to hold the vehicle in a stationary position. The method also determines that the operator has released the brake pedal. The brake is released whilst engaging a launch clutch of the CVT, wherein the launch clutch is engaged by increasing a clutch engagement pressure at a first pressure ramp rate, such that the sum of the braking torque and a clutch torque of the clutch remains equal to the holding torque. An acceleration torque requested by the operator via the accelerator is determined. The clutch engagement pressure is increased at a second pressure ramp rate when it is determined that the braking torque is substantially zero, such that the clutch torque is increased by the acceleration torque. A fixed minimum pressure ramp rate is stored, wherein the minimum pressure ramp rate increases the clutch engagement pressure towards a maximum engagement pressure. The current pressure ramp rate is compared with the minimum pressure ramp rate, and the clutch engagement pressure is switched to the minimum pressure ramp rate if the current pressure ramp rate is less than the minimum pressure ramp rate.

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