Cooling device anomaly diagnosing apparatus

Patent metadata

Field	Value
Publication number	US-10690039-B2
Application number	US-201816207244-A
Country	US
Kind code	B2
Filing date	Dec 3, 2018
Priority date	Dec 15, 2017
Publication date	Jun 23, 2020
Grant date	Jun 23, 2020

Abstract

An anomaly diagnosing apparatus is adapted for a cooling device in an internal combustion engine. The apparatus is configured to execute an enlarging process, a rate calculating process, and an anomaly determining process. The enlarging process includes enlarging the cross-sectional area of the flow passage between an inner channel and an outer channel in the cooling device. The rate calculating process includes calculating a reference rate for a rate of rise of temperature of cooling water. The anomaly determining process includes determining that an anomaly is present in the check valve if a rate of rise of a detection value of cooling water temperature is smaller than the reference rate. The rate calculating process includes calculating the reference rate such that the reference rate has a smaller value in a case where the enlarging process is executed than in a case where the enlarging process is not executed.

First claim

The invention claimed is:

1. A cooling device anomaly diagnosing apparatus adapted for a cooling device in an internal combustion engine, wherein the cooling device includes an inner channel serving as a cooling channel located inside the internal combustion engine, an outer channel serving as a cooling channel located outside the internal combustion engine, the outer channel constituting, together with the inner channel, a loop path in which cooling water is circulated, and a multi-port valve capable of adjusting a cross-sectional area of a flow passage between the inner channel and the outer channel by an electronic control, the multi-port valve including a check valve configured to open when a pressure inside is higher than a pressure in the outer channel by an amount greater than or equal to a predetermined amount, the anomaly diagnosing apparatus is configured to execute an enlarging process of enlarging the cross-sectional area of the flow passage by operating the multi-port valve such that the cross-sectional area is larger in a case where a rotational speed of a crankshaft of the internal combustion engine is at a predetermined speed or higher than in a case where the rotational speed is lower than the predetermined speed, a rate calculating process of calculating, within a predetermined time period after startup of the internal combustion engine, a reference rate such that the reference rate has a larger value in a case where a fuel injection amount of the internal combustion engine is large than in a case where the fuel injection amount is small, the reference rate being a reference value for a rate of rise of a cooling water temperature in sections of the loop path other than the outer channel, and an anomaly determining process of determining, within the predetermined time period, that an anomaly is present in the check valve if a rate of rise of a detection value of a cooling water temperature in paths other than the outer channel is smaller than the reference rate, and a notifying process to prompt a user if an anomaly is determined to be present in the check valve, wherein the rate calculating process includes calculating the reference rate such that the reference value has a smaller value in a case where the enlarging process is executed than in a case where the enlarging process is not executed.

2. The cooling device anomaly diagnosing apparatus according to claim 1 , wherein the anomaly diagnosing apparatus is further configured to execute an integrating process of calculating a flow rate integrated value, which is an integrated value of an amount of cooling water circulating in the loop path through the multi-port valve within a period in which the cross-sectional area of the flow passage is enlarged by the enlarging process, and the rate calculating process includes calculating the reference rate such that the reference rate has a smaller value in a case where the flow rate integrated value is small than in a case where the flow rate integrated value is large.

3. The cooling device anomaly diagnosing apparatus according to claim 1 , wherein
the anomaly diagnosing apparatus is further configured to execute a temperature calculating process of calculating a reference temperature based on the integrating process of the reference rate, the reference temperature being a reference value for a cooling water temperature, and
the rate calculating process includes calculating, within a period in which the cross-sectional area of the flow passage is enlarged by the enlarging process, the reference rate such that the reference rate has a smaller value in a case where an amount by which the reference temperature is higher than an outside air temperature is great than in a case where the amount is small, and a reference rate calculated by the process may be a negative value.

4. The cooling device anomaly diagnosing apparatus according to claim 1 wherein
the anomaly diagnosing apparatus is further configured to execute a temperature calculating process of calculating a reference temperature based on the integrating process of the reference rate, the reference temperature being a reference value for cooling water temperature, and
the anomaly determining process is a process of, when the reference temperature reaches or exceeds a threshold earlier than the detection value of the cooling water temperature reaching or exceeding the threshold, determining that the rate of rise of the detection value of the cooling water temperature is smaller than the reference rate and an anomaly is present in the check valve.

5. The cooling device anomaly diagnosing apparatus according to claim 4 , comprising a detection-value counter and a reference counter, wherein the anomaly determining process includes
a detection value increment process of incrementing the detection-value counter each time the detection value of cooling water temperature reaches or exceeds the threshold,
a reference increment process of incrementing the reference counter each time the reference temperature reaches or exceeds the threshold, and
a process of determining that an anomaly is present in the check valve when the reference counter reaches the predetermined value before the detection-value counter reaches the predetermined value.

Assignees

• Toyota Motor Co Ltd

Inventors

• Insixiengmai Leuth
• Maruta Sei

Classifications

• G01M15/046 Primary

  by monitoring revolutions (for detecting misfire G01M15/11) · CPC title

• G01M15/048

  by monitoring temperature · CPC title

• F01P11/16

  concerning coolant temperature (F01P11/20 takes precedence) · CPC title

• F01P2031/36

  Failure of coolant pump · CPC title

• F01P7/14 Primary

  the coolant being liquid · CPC title