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US 10,770,886 B2Granted
Electromagnetic load drive device and in-vehicle control system
AssigneeHitachi Automotive Systems, Ltd.
InventorKentarou Jyumonji
Life of this patent
Estimating the term…
Abstract
To provide an electromagnetic bad driving device capable of performing failure diagnosis of a relay more frequently. The electromagnetic bad driving device according to the present invention, interrupts the relay while an electromagnetic induction bad is under control, and diagnoses the relay on the basis of a surge voltage occurring at the interruption.
Claims11
An electromagnetic load driving device configured to drive an electromagnetic induction load, the electromagnetic load driving device comprising:
- a first switch configured to control an energizing current to be supplied to the electromagnetic induction load;
- a second switch connected to the electromagnetic induction load in series, the second switch being configured to switch between interruption and energization of the energizing current;
- a voltage detecting unit configured to detect a voltage between the second switch and the electromagnetic induction load;
- and
- a computing unit configured to diagnose whether an energizing path of the energizing current is normal, based on a surge voltage detected by the voltage detecting unit when the second switch interrupts the energizing current during the control of the energizing current by the first switch.
2 more elements
An in-vehicle control system comprising:
- an electromagnetic induction load;
- and
- an electromagnetic load driving device configured to drive the electromagnetic induction load,
- wherein the electromagnetic load driving device includes:
- a first switch configured to control an energizing current to be supplied to the electromagnetic induction load;
- a second switch connected to the electromagnetic induction load in series, the second switch being configured to switch between interruption and energization of the energizing current;
- a voltage detecting unit configured to detect a voltage between the second switch and the electromagnetic induction load;
- and
- a computing unit configured to diagnose whether an energizing path of the energizing current is normal, based on a surge voltage detected by the voltage detecting unit when the second switch interrupts the energizing current during the control of the energizing current by the first switch.
6 more elements
Dependencies are inferred from the claim text.