Hydraulic pressure control unit

Patent metadata

Field	Value
Publication number	US-10926746-B2
Application number	US-201916415375-A
Country	US
Kind code	B2
Filing date	May 17, 2019
Priority date	May 22, 2018
Publication date	Feb 23, 2021
Grant date	Feb 23, 2021

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.

First claim

What is claimed is:

1. 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.

2. The hydraulic pressure control unit according to claim 1 , the controller being further configured to:
vary, with the diagnosis section of the controller, the reference value in accordance with a temperature.

3. The hydraulic pressure control unit according to claim 1 , the controller being further configured to:
diagnose, with the diagnosis section of the controller, a presence of fixation of the armature relative to the coil when the temporary reduction is less than the reference value; and
output an operation command to a notification device, in response to the diagnosis result indicating that the fixation of the electromagnetic valve has occurred, the operation command configured to cause the notification device to notify the diagnosis result.

4. The hydraulic pressure control unit according to claim 1 , wherein the vehicle behavior control system is part of a motorcycle.

5. 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.

Assignees

• Bosch Gmbh Robert

Inventors

• Ohtaka Jun

Classifications

• B60T8/36 Primary

  including a pilot valve responding to an electromagnetic force · CPC title

• B60T8/4275

  Pump-back systems · CPC title

• B60T8/3225

  Systems specially adapted for single-track vehicles, e.g. motorcycles (B60T8/3235 takes precedence) · CPC title

• B60T8/328 Primary

  Systems sharing components with other fluid systems onboard the vehicle · CPC title

• B60T8/4027

  Pump units driven by (parts of) the vehicle propulsion unit · CPC title