发明授权
- 专利标题: Method for improving shift quality in an automatic transmission
- 专利标题(中): 改善自动变速箱换档质量的方法
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申请号: US13061335申请日: 2009-07-27
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公开(公告)号: US08690730B2公开(公告)日: 2014-04-08
- 发明人: David W. Wright , Philippe Ramet , Morgan Postic
- 申请人: David W. Wright , Philippe Ramet , Morgan Postic
- 申请人地址: US MI Detroit
- 专利权人: GM Global Technology Operations LLC
- 当前专利权人: GM Global Technology Operations LLC
- 当前专利权人地址: US MI Detroit
- 代理机构: Ingrassia Fisher & Lorenz, P.C.
- 优先权: GB0815600.2 20080828
- 国际申请: PCT/EP2009/005436 WO 20090727
- 国际公布: WO2010/022835 WO 20100304
- 主分类号: B60W10/04
- IPC分类号: B60W10/04
摘要:
A method is provided for improving shift quality in an automatic transmission. In many automatic transmissions, the shift quality during lift foot upshifts is unsatisfying. Generally, two types of complaints concerning shift quality are known: harsh feel right after the shift order and bump at the synchronization of the shift. In order to provide an automatic transmission which overcomes these two problems, a first and a second positive torque requests are initiated on upshift coasts. This measure improves the global shift feel by controlling the engine toque level at shift order and at synchronization: the engine torque level at the beginning of the gear shift is smoothly decreased to reduce the initial bump and is controlled at the synchronization to reduce the amplitude of underlap when the clutch capacity is rising.
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