Hydraulic pressure control unit
AssigneeRobert Bosch GmbH
InventorJun Ohtaka
Life of this patent
Estimating the term…
Abstract
The present disclosure obtains a hydraulic pressure control unit capable of appropriately diagnosing presence or absence of fixation of an electromagnetic valve. In the hydraulic pressure control unit according to the present disclosure, a controller includes: an acquisition section that acquires a current value of a current flowing through a coil of the electromagnetic valve in a hydraulic pressure control mechanism; and a diagnosis section that determines whether the current value has exhibited behavior of being temporarily reduced in a process in which the current value is increased at initiation of applying the current to the coil of the electromagnetic valve, so as to diagnose the presence or the absence of the fixation of the electromagnetic valve.
Claims5
A hydraulic pressure control unit for a vehicle behavior control system, the hydraulic pressure control unit comprising:
- a hydraulic pressure control mechanism that includes a base body and components assembled in the base body, the base body including an electromagnetic valve configured to control a hydraulic pressure generated by a hydraulic fluid for the vehicle behavior control system, the electromagnetic valve including a coil and a corresponding movable armature;
- and
- a controller configured to:
- control, with a control section of the controller, operation of the components of the hydraulic pressure control mechanism;
- acquire, with an acquisition section of the controller, a measured value of a current flowing through the coil of the electromagnetic valve;
- identify, with a diagnosis section of the controller, a temporary reduction in the measured value when the current flowing through the coil is increased at initiation of applying the current to the coil of the electromagnetic valve, wherein the temporary reduction is a difference in a first measured value of the current at a first time and a second measured value of the current at a second time after the first time;
- and
- diagnose, with the diagnosis section of the controller, an absence of fixation of the armature relative to the coil when the temporary reduction is greater than a reference value,
- wherein the measured value is continuously reduced from the first time to the second time.
A hydraulic pressure control unit for a vehicle behavior control system, the hydraulic pressure control unit comprising:
- a hydraulic pressure control mechanism that includes a base body and components assembled in the base body, the base body including an electromagnetic valve configured to control a hydraulic pressure generated by a hydraulic fluid for the vehicle behavior control system;
- and
- a controller configured to:
- control, with a control section of the controller, operation of the components of the hydraulic pressure control mechanism;
- acquire, with an acquisition section of the controller, a current value of a current flowing through a coil of the electromagnetic valve;
- diagnose, with a diagnosis section of the controller, one of (i) a presence and (ii) an absence of a fixation of the electromagnetic valve by determining whether the current value has exhibited behavior of being temporarily reduced in a process in which the current value is increased at initiation of applying the current to the coil of the electromagnetic valve;
- and
- not validate a diagnosis result of the fixation of the electromagnetic valve, in response to a determination that behavior of a power supply, which is configured to supply power to the coil of the electromagnetic valve, has been abnormal in the process in which the current value is increased at the initiation of applying the current to the coil of the electromagnetic valve.
Dependencies are inferred from the claim text.