Malfunction detection method and electronic control device capable of detecting malfunction

Patent metadata

Field	Value
Publication number	US-2024103080-A1
Application number	US-202318523731-A
Country	US
Kind code	A1
Filing date	Nov 29, 2023
Priority date	Jun 1, 2021
Publication date	Mar 28, 2024
Grant date	—

Abstract

A malfunction detection method detects a malfunction in an electronic control device. The electronic control device includes a normal power supply terminal connected to a normal power supply mounted on a vehicle, a starting power supply terminal connected to a starting power supply, a controller activated by supply of a normal voltage, and a wake-up circuit having a wake-up switch to open and close a power supply path from the normal power supply terminal to the controller. The wake-up circuit turns on the wake-up switch when a starting voltage input to the starting power supply terminal is equal to or greater than an ON threshold. The malfunction detection method includes determining by the controller that the wake-up switch has an ON sticking malfunction when the normal voltage is equal to or greater than a threshold and the starting voltage is less than the ON threshold.

First claim

What is claimed is:

1 . A malfunction detection method for detecting a malfunction in an electronic control device including a normal power supply terminal connected to a normal power supply mounted on a vehicle, a starting power supply terminal connected to a starting power supply via a starting switch that is turned on when the vehicle is started, a controller which is activated by supply of a normal voltage input from the normal power supply via the normal power supply terminal, and a wake-up circuit having a wake-up switch configured to open and close a power supply path from the normal power supply terminal to the controller, the wake-up circuit being configured to turn on the wake-up switch to open the power supply path when a starting voltage input to the starting power supply terminal is equal to or greater than an ON threshold, the malfunction detection method comprising
determining by the controller that the wake-up switch has an ON sticking malfunction when the normal voltage is equal to or greater than a determination threshold and the starting voltage is less than the ON threshold.

2 . The malfunction detection method according to claim 1 , wherein
the determining by the controller is performed when the controller is activated by switching of a state of connection between the normal power supply and the normal power supply terminal is switched from a disconnected state to a connected state.

3 . A malfunction detection method for detecting a malfunction in an electronic control device including a normal power supply terminal connected to a normal power supply mounted on a vehicle, a starting power supply terminal connected to a starting power supply via a starting switch that is turned on when the vehicle is started, a controller which is activated by supply of a normal voltage input from the normal power supply via the normal power supply terminal, and a wake-up circuit having a wake-up switch configured to open and close a power supply path from the normal power supply terminal to the controller, the wake-up circuit being configured to turn on the wake-up switch to open the power supply path when a starting voltage input to the starting power supply terminal is equal to or greater than an ON threshold, the malfunction detection method comprising
determining by the controller that the wake-up switch has an ON sticking malfunction when the controller is operating and the starting voltage is less than the ON threshold.

4 . An electronic control device capable of detecting a malfunction, the electronic control device comprising:
a normal power supply terminal connected to a normal power supply mounted on a vehicle; a starting power supply terminal connected to a starting power supply via a starting switch that is turned on when the vehicle is started; a controller which is activated by supply of a normal voltage input from the normal power supply via the normal power supply terminal; and a wake-up circuit having a wake-up switch configured to open and close a power supply path from the normal power supply terminal to the controller, wherein the wake-up circuit is configured to turn on the wake-up switch to open the power supply path when a starting voltage input to the starting power supply terminal is equal to or greater than an ON threshold, the controller is configured to determine that the wake-up switch has an ON sticking malfunction when the normal voltage is equal to or greater than a determination threshold and the starting voltage is less than the ON threshold or when the controller is operating and the starting voltage is less than the ON threshold.

Assignees

• Denso Corp

Inventors

• Tashima Tsuyoshi
• Kobayashi Daisuke
• Taki Masaya
• Kano Ryo
• Kameya Hisashi

Classifications

• G01R31/3278

  of relays, solenoids or reed switches (measuring contact resistance G01R27/205; high voltage magnetic switches G01R31/3271, G01R31/333; testing electric windings G01R31/72; monitoring of fail safe circuits H01H47/002) · CPC title

• G01R31/327 Primary

  Testing of circuit interrupters, switches or circuit-breakers · CPC title

• B62D5/0481 Primary

  monitoring the steering system, e.g. failures · CPC title

• G01R19/16576

  comparing DC or AC voltage with one threshold (G01R19/16514, G01R19/16519, G01R19/16528, G01R19/16533 and G01R19/1659 take precedence) · CPC title

• H02H7/20

  for electronic equipment (for converters H02H7/10; for electric measuring instruments G01R1/36; for DC voltage or current semiconductor regulators G05F1/569; for amplifiers H03F1/52; for electronic switching circuits H03K17/08) · CPC title