Invention Grant
- Patent Title: Launch control method for a vehicle
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Application No.: US16648971Application Date: 2018-09-17
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Publication No.: US11040718B2Publication Date: 2021-06-22
- Inventor: Michael Beyer , Michael Cronin , Steven Spencer , Matthew Mauritzson , Kevin Stutzman
- Applicant: Perkins Engines Company Limited
- Applicant Address: GB Peterborough
- Assignee: Perkins Engines Company Limited
- Current Assignee: Perkins Engines Company Limited
- Current Assignee Address: GB Peterborough
- Priority: EP17195333 20171006
- International Application: PCT/EP2018/075046 WO 20180917
- International Announcement: WO2019/068452 WO 20190411
- Main IPC: B60W10/02
- IPC: B60W10/02 ; B60W30/18 ; B60W10/101 ; B60W10/18 ; B60W30/186

Abstract:
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.
Public/Granted literature
- US20200282994A1 A Launch Control Method For A Vehicle Public/Granted day:2020-09-10
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