Invention Grant
- Patent Title: Electromechanical park brake strategy for transmission park pawl engagement
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Application No.: US16437758Application Date: 2019-06-11
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Publication No.: US11407388B2Publication Date: 2022-08-09
- Inventor: James R Hollowell , Zachary Rogalski
- Applicant: James R Hollowell , Zachary Rogalski
- Applicant Address: US MI Brownstown; US MI Rochester Hills
- Assignee: James R Hollowell,Zachary Rogalski
- Current Assignee: James R Hollowell,Zachary Rogalski
- Current Assignee Address: US MI Brownstown; US MI Rochester Hills
- Agent Ralph E. Smith
- Main IPC: B60T7/00
- IPC: B60T7/00 ; B60W10/00 ; B60T7/12 ; B60W10/18 ; B60W30/18 ; F16H63/34 ; F16H61/22

Abstract:
Park control systems and methods operate such that, in response to a request to engage or disengage a park pawl of a vehicle park pawl system, a controller commands a hydraulic brake system to maintain a hydraulic brake pressure therein generated in response to depression of a brake pedal by a driver of the vehicle, when vehicle movement is detected after maintaining the hydraulic brake pressure, commands a vacuum-independent electric brake booster to generate and provide additional hydraulic brake pressure to the hydraulic brake system, commands the park pawl system to engage or disengage the park pawl to/from a transmission output shaft, and after the park pawl is engaged or disengaged to/from the transmission output shaft, commands the hydraulic brake system to release its hydraulic pressure at a defined rate.
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