Abnormality cause determining device, vehicular control device, and vehicular control system

Patent metadata

Field	Value
Publication number	US-12033443-B2
Application number	US-202117346863-A
Country	US
Kind code	B2
Filing date	Jun 14, 2021
Priority date	Jun 16, 2020
Publication date	Jul 9, 2024
Grant date	Jul 9, 2024

Abstract

An abnormality cause determining device that is applied to a vehicle including an electromagnetic actuator includes a storage device and an execution device. The storage device is configured to store map data which is data for defining a map. The map includes a current variable which is a variable indicating a current flowing actually in the electromagnetic actuator as an input variable and includes a cause variable which is a variable indicating a cause of an abnormality of an onboard unit including the electromagnetic actuator as an output variable. The execution device is configured to perform an acquisition process of acquiring a value of the input variable based on a detection value from a sensor which is mounted in the vehicle and a calculation process of calculating a value of the output variable by inputting the value of the input variable to the map.

First claim

What is claimed is:

1. An abnormality cause determining device that is applied to a vehicle including an electromagnetic actuator, comprising:
a storage device configured to store map data which is data for defining a map, the map including a current variable which is a variable indicating a current actually flowing in the electromagnetic actuator as an input variable and including a cause variable which is a variable indicating a cause of an abnormality of an onboard unit including the electromagnetic actuator as an output variable; and
an execution device configured to perform an acquisition process of acquiring a value of the input variable based on a detection value from a sensor which is mounted in the vehicle and a calculation process of calculating a value of the output variable by inputting the value of the input variable to the map, wherein
the onboard unit is a gear shifting device that changes a gear shift ratio between a rotation speed of a rotation shaft of a rotary machine which is mounted in the vehicle and a rotation speed of driving wheels,
the electromagnetic actuator includes a solenoid valve of the gear shifting device, and
the current variable which is the input variable includes a variable indicating a current flowing in the solenoid valve in a switching period of the gear shift ratio in the gear shifting device, wherein
the storage device is configured to store a plurality of pieces of map data which differs depending on a switching type of the gear shift ratio, and
the calculation process includes a selection process of selecting the map data corresponding to switching of the gear shift ratio in a sampling period of the current variable which is the input variable out of the plurality of pieces of map data as the map data defining the map for calculating the value of the output variable.

2. The abnormality cause determining device according to claim 1 , wherein the current variable includes a variable indicating a difference between the detection value of the current flowing in the solenoid valve in the switching period and a current command value.

3. The abnormality cause determining device according to claim 1 , wherein:
the storage device is configured to store a plurality of pieces of map data which differs depending on a torque variable which is a variable indicating a torque applied to the driving wheels;
the acquisition process includes a process of acquiring a value of the torque variable; and
the calculation process includes a selection process of selecting the map data corresponding to the value of the torque variable acquired through the acquisition process out of the plurality of pieces of map data as the map data defining the map for calculating the value of the output variable.

4. The abnormality cause determining device according to claim 1 , wherein the current variable which is the input variable simultaneously input to the map includes a variable indicating a current having flowed in the solenoid valve when the same switch was performed in the past in addition to the variable indicating the current flowing in the solenoid valve in a present switching period of the gear shift ratio in the gear shifting device.

5. The abnormality cause determining device according to claim 1 , wherein the cause variable includes a decrease in controllability of the solenoid valve due to bubbles included in a hydraulic fluid of the gear shifting device, a temporary stick abnormality which is an abnormality temporarily occurring in an operation of the solenoid valve due to temporary mixing of foreign matter into the solenoid valve, and a regular stick abnormality which is an abnormality occurring regularly in the operation of the solenoid valve due to mixing of foreign matter into the solenoid valve.

6. A vehicular control device comprising the abnormality cause determining device according to claim 1 , wherein:
the execution device is configured to perform

an abnormality determining process of determining that an abnormality has occurred in the gear shifting device when a degree of separation between a rotation speed of an input shaft of the gear shifting device in a period in which the gear shift ratio is switched and a reference rotation speed is equal to or greater than a predetermined value, and
an alarming process of issuing an alarm indicating that the abnormality has occurred; and
the acquisition process includes a process of acquiring the value of the input variable in the period in which the gear shift ratio is switched when it is determined through the abnormality determining process that the abnormality has occurred.

7. The vehicular control device according to claim 6 , wherein the execution device is configured to perform a storage process of storing a calculation result of the calculation process in the storage device.

8. A vehicular control system comprising the vehicular control device according to claim 6 , wherein:
the execution device includes a first execution device that is provided in the vehicle and a second execution device that is not provided in the vehicle;
the first execution device is configured to perform a data transmission process of transmitting data based on a detection value from the sensor associated with a current flowing actually in the electromagnetic actuator; and
the second execution device is configured to perform a data receiving process of receiving data transmitted in the data transmission process and the calculation process.

9. The vehicular control system according to claim 8 , wherein:
the second execution device is configured to perform the calculation process based on values of current variables of a plurality of vehicles; and
the second execution device is configured to perform a feedback process and an update process, the feedback process is a process of acquiring information indicating that the value of the output variable of the calculation process is not valid, and the update process is a process of updating the map data when the information indicating that the value of the output variable is not valid is acquired in the feedback process.

10. The vehicular control system according to claim 8 , wherein:
the second execution device is configured to perform a result transmitting process of transmitting a calculation result of the calculation process; and
the first execution device is configured to perform a result receiving process of receiving the calculation result transmitted in the result transmitting process.

11. A vehicular control device comprising the first execution device in the vehicular control system according to claim 8 .

12. A vehicular control device comprising the abnormality cause determining device according to claim 1 , wherein:
the map is a first map;
the map data is first map data;
the acquisition process is a first acquisition process;
the calculation process is a first calculation process;
the execution device is configured to perform a dither control process of causing a current to flow in the solenoid valve such that the solenoid valve for switching a frictional engagement element which is disengaged when the gear shift ratio is not switching between disengagement and engagement vibrates in a range in which the frictional engagement element is not engaged;
the storage device is configured to store second map data for defining a second map including the current variable when the dither control process is performed as an input variable and including an abnormality variable which is a variable indicating whether an abnormality has occurred in the solenoid valve as an output variable; and
the execution device is configured to perform
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Assignees

• Toyota Motor Co Ltd

Inventors

• Tabata Atsushi
• Okuda Koichi
• Imamura Ken
• Ito Shinichi
• Fujii Kota

Classifications

• F16H61/12 Primary

  Detecting malfunction or potential malfunction, e.g. fail safe (in control of hydrostatic gearing F16H61/4192) {; Circumventing or fixing failures} · CPC title

• F16H2061/1288

  the failing part is an actuator · CPC title

• F16H61/0204

  for gearshift control, e.g. control functions for performing shifting or generation of shift signal · CPC title

• F16H2061/1216

  Display or indication of detected failures · CPC title

• G07C5/0816

  Indicating performance data, e.g. occurrence of a malfunction · CPC title