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1. 发明授权

US06278927B1 Transfer case ratio diagnostic method for a motor vehicle powertrain 有权
标题翻译：机动车辆动力总成传动箱比例诊断方法
公开(公告)号：US06278927B1
公开(公告)日：2001-08-21
申请号：US09577256
申请日：2000-05-22
申请人： Christopher Ray Fox , Scott E Mundy , Sean E Gleason , Jeffrey Kurt Runde
发明人： Christopher Ray Fox , Scott E Mundy , Sean E Gleason , Jeffrey Kurt Runde
IPC分类号： B60K1734
CPC分类号： F16H61/12 , B60K17/344 , F16H59/40 , F16H59/42 , F16H59/50 , F16H59/70 , F16H61/686 , F16H63/42 , F16H2061/1208 , F16H2061/122 , F16H2061/1284 , Y10T477/69383
摘要： An improved diagnostic control method for a motor vehicle powertrain including an electronically controlled multi-range transmission and a multi-range transfer case, wherein a default determination of transfer case range enables reliable evaluation of transmission ratio, for powertrain configurations with or without a transfer case range indicator switch. An overall speed ratio is computed according to a ratio of the transmission input speed and the transfer case output speed, and the computed ratio is monitored to identify a period of stable operation at the conclusion of transmission shifting and in steady state operation during which the rate of change of the computed ratio is stable over a predefined interval. If the computed ratio is also deemed to be stable, it is compared with an expected overall ratio based on an assumed speed range (low or high) of the transfer case. In configurations having a transfer case indicator switch, the switch state determines the assumed speed range, whereas in configurations not having an indicator switch, a low range of the transfer case is assumed. A default condition of the transfer case is determined based on the ratio comparison, and transmission diagnosis is carried out based on the default conditions.
摘要翻译：一种用于包括电子控制的多范围传输和多范围传送箱的机动车辆动力系的改进的诊断控制方法，其中传送情况范围的默认确定使得能够可靠地评估传输比，对于具有或不具有传送箱的动力系配置量程指示灯开关根据传动输入速度与传送箱输出速度的比率来计算总速比，并且监视所计算的比率，以便在传输转移结束时和在稳态运行期间确定稳定运行的周期，在此期间速率所计算的比率的变化在预定义的间隔内是稳定的。如果计算的比例也被认为是稳定的，则将其与基于转移情况的假定速度范围（低或高）的预期总比进行比较。在具有传送箱指示器开关的配置中，开关状态确定假设的速度范围，而在没有指示开关的配置中，假定传送箱的低范围。基于比例比较确定传送案例的默认条件，并根据默认条件进行传输诊断。

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