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发明授权
CN107956607B 流量控制阀的全闭异常诊断装置 有权

流量控制阀的全闭异常诊断装置
摘要：
本发明提供一种流量控制阀的全闭异常诊断装置。该全闭异常诊断装置能够在全闭时适当地诊断阀座与阀芯之间的咬入有异物的异常。EGR阀包括设于外壳的流路的阀座、能够落位于阀座的阀芯、用于驱动阀芯使其相对于阀座开闭的旋转轴、马达及减速机构、用于对阀芯向闭阀方向施力的复位弹簧、以及设于外壳且用于检测阀芯相对于阀座的开度的开度传感器。电子控制装置(ECU)用于在阀芯全闭时诊断阀座与阀芯之间的异物咬入异常。ECU在阀芯全闭时为了对阀芯向闭阀方向施力而驱动控制马达等，在该驱动控制时由开度传感器检测出的全闭检测值与规定的基准全闭检测值的检测差大于规定的第1判定值的情况下，判定EGR阀为异物咬入异常。
摘要（英）：

An EGR valve includes a valve seat in a flow passage of a housing, a valve element seatable on the valve seat, a rotary shaft to open or close the valve element, a motor and a speed reducing mechanism, a return spring urging the valve element in a valve closing direction, and an opening-degree sensor to detect an opening degree of the valve element. An electronic control unit (ECU) diagnoses abnormality due to lodging of foreign matter between the valve seat and the valve element during full close. When driving the motor to urge the valve element in the valve closing direction during full close of the valve element, the ECU determines the EGR valve to be abnormal because of lodging of foreign matter if a difference between a value detected by the opening-degree sensor and a predetermined reference value is larger than a first determination value.

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