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发明公开
CN105221736A 挂入空档故障的系统以及环形锥盘滚轮式自动变速器 有权

挂入空档故障的系统以及环形锥盘滚轮式自动变速器
摘要：
一种用于包括变速机构的变速器挂入空档故障的诊断技术可以包括监测压差阀的状态，所述压差阀以使流体流动的方式联接被施加到至少一个致动器的高压侧压力，其中所述至少一个致动器联接到所述变速机构的至少一个滚轮，并且所述压差阀还以使流体流动的方式联接被施加到所述至少一个致动器的低压侧压力，从所述压差阀的状态确定变速机构扭矩符号，其中所述变速机构扭矩符号对应由所述至少一个滚轮传递的扭矩是正或负，基于所述变速器的当前运行条件确定预期的变速机构扭矩符号，并且如果所确定的变速机构扭矩符号不同于是预期的变速机构扭矩符号，命令所述变速器达到真正挂入空档状况。
摘要（英）：

A fail-to-neutral diagnostic technique for a transmission that includes a variator may include monitoring a state of a pressure differential valve fluidly coupled to a high side pressure applied to at least one actuator coupled to at least one corresponding roller of the variator and also fluidly coupled to a low side pressure applied to the at least one actuator, determining from the state of the pressure differential valve a variator torque sign corresponding to whether torque transferred by the at least one roller is positive or negative, determining an expected variator torque sign based on current operating conditions of the transmission, and commanding the transmission to a true neutral condition if the determined variator torque sign is different from the expected variator torque sign.

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