Patent ID: 11935338
Assignee: HITACHI ASTEMO, LTD.
Field: Control (Instruments)
Classification: CPC G  B  H  F | IPC G

Claim 3:
4. An in-vehicle electronic control device comprising:
a drive element that drives an external element;
a current detection unit that detects a current value flowing through the external element; and
a control unit that uses information of the current value to transmit a control command to the drive element, wherein
the in-vehicle electronic control device includes a first detection means that detects an abnormality of the external element when current value information acquired from the current detection unit is equal to or higher than a threshold value of a current of the external element, and a second detection means that detects an abnormality when a resistance value of the external element is calculated using the current value information and information of a power supply voltage applied to the external element, and the calculated resistance value is equal to or less than a threshold value of a resistance of the external element,
a relationship in which a threshold value current is proportional to a voltage is provided so that the first detection means sets a threshold value of a current for determining an abnormality of the external element to low when a power supply voltage applied to the external element is low, and sets a threshold value of a current for determining an abnormality of the external element to high when the power supply voltage applied to the external element is high,
the in-vehicle electronic control device includes an integrated circuit including the control unit, and an arithmetic device that acquires the current value information from the integrated circuit,
the integrated circuit executes the first detection means,
the arithmetic device executes the second detection means,
when a voltage applied to the external element exceeds a predetermined voltage, the first detection means is performed, and the second detection means is not executed, and
when a voltage applied to the external element is equal to or less than the predetermined voltage, at least the second detection means is performed.