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发明公开
CN1920344A 用于车辆自动变速器的控制装置 有权

用于车辆自动变速器的控制装置
摘要：
本发明涉及一种用于车辆自动变速器(10)的液压控制装置，在该液压控制装置中，如果判定自动变速器(10)中存在会导致锁死的故障，则在切换阀(36)中的第一输出口(38c)与第一排出口(38a)之间提供连通。结果，当存在故障时应当分离的液压摩擦接合装置分离。另外，通过控制切换阀(36)实现特定档位。因此，不需要选择在当存在故障时应当分离的液压摩擦接合装置接合的条件下实现的档位。因而，当自动变速器(10)中存在会导致锁死的故障时，可以防止可能降低操纵性的换档。
摘要（英）：

In a hydraulic control apparatus for a vehicular automatic transmission (10), if it is determined that there is a failure that may cause tie-up in an automatic transmission (10), communication is provided between a first output port (38c) and a first drain port (38a) in a switching valve (36). As a result, a hydraulic frictional engagement device, which should be disengaged when there is a failure, is disengaged. Also, a specific shift speed is achieved by controlling the switching valve (36). Therefore, it is not necessary to select a shift speed that is achieved on the condition that the hydraulic frictional engagement device, which should be disengaged when there is a failure, is engaged. Thus, it is possible to prevent a shift that may impair driveability when there is a failure that may cause tie-up in the automatic transmission (10).

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