Invention Application
- Patent Title: Process for monitoring the direction of frictional drive from a vehicle transmission at near-zero vehicle speed
- Patent Title (中): 用于以近零车速监测来自车辆变速器的摩擦驱动方向的过程
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Application No.: US11770884Application Date: 2007-06-29
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Publication No.: US20080015758A1Publication Date: 2008-01-17
- Inventor: Georg Gierer , Christian Popp , Thilo Schmidt , Klaus Steinhauser
- Applicant: Georg Gierer , Christian Popp , Thilo Schmidt , Klaus Steinhauser
- Applicant Address: DE Friedrichshafen
- Assignee: ZF Friedrichshafen AG
- Current Assignee: ZF Friedrichshafen AG
- Current Assignee Address: DE Friedrichshafen
- Priority: DE102006030526.4 20060701
- Main IPC: F16H61/12
- IPC: F16H61/12

Abstract:
A process for monitoring a direction of drive from an automatic or automated vehicle transmission at near-zero vehicle speed via an engaged gear. A desired direction of drive of the transmission is determined from an engaged gear at the time the vehicle begins motion. An actual direction of drive is determined from the transmission and if different from the desired direction of driver an error signal is produced. The process including determining the actual drive either from a sensed rotational direction of a transmission input shaft and a sensed rotational direction of a transmission output shaft or a sensed valve setting, a sensed pressure in an transmission electro-hydraulic control system or on a transmission shifting element or from a sensed direction of rotation of a transmission gearset element or from axial movement or force of a transmission constructional element.
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