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US 8,798,859 B2Granted
Suspension control apparatus
AssigneeHitachi Automotive Systems, Ltd.
InventorsToru Uchino, Ryusuke Hirao, Yohei Katayama, Hiroyuki Yabe, Hiroki Ohara
Life of this patent
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Abstract
[Object] The present invention provides a suspension control apparatus that allows miniaturization of a solenoid valve. [Solution] When a controller is started up by a power source controller (a power source unit), the controller switches a control current from 0 ampere to a maximum current value I6 at the same time as the startup. After that, the control shifts to normal control. As a result, even if a hysteresis of a damping force characteristic is large relative to the control current, it is possible to promptly move a solenoid valve to a position to be used in the normal control.
Claims12
A suspension control apparatus comprising:
- a damping force adjustable shock absorber disposed between a body and each wheel of a vehicle, the damping force adjustable shock absorber being capable of adjusting a damping force characteristic by adjustment of a control current to be supplied to a solenoid;
- a running state detector adapted to detect a running state of the vehicle;
- and
- a controller adapted to calculate a damping force that the controller causes the damping force adjustable shock absorber to generate based on a detection result of the running state detector, and determine a current value of the control current based on a result of the calculation, thereby performing normal control,
- wherein the damping force adjustable shock absorber is adapted to generate a hard characteristic by a current value larger than a current value of the control current corresponding to a soft characteristic,
- wherein the controller performs initialization control, according to which the controller switches the control current to a current value larger than the current value for instructing the damping force of the soft characteristic, and after that, performs the normal control,
- wherein the damping force adjustable shock absorber includes a movable element adapted to be moved by the solenoid, a valve body disposed at the movable element and adapted to be separated from and seated on a valve seat facing the valve body, and a biasing unit adapted to bias the valve body in a valve opening direction, and
- wherein a solenoid actuator is constituted by the movable element, the valve body, and the biasing unit, the solenoid actuator being adapted to move the valve body in a valve closing direction by application of an axial thrust force according to an energization current onto the movable element.
5 more elements
A suspension control apparatus comprising:
- a damping force adjustable shock absorber disposed between a body and each wheel of a vehicle, the damping force adjustable shock absorber being capable of adjusting a damping force characteristic by adjustment of a control current to be supplied to a solenoid;
- a running state detector adapted to detect a running state of the vehicle;
- and
- a controller adapted to calculate a damping force that the controller causes the damping force adjustable shock absorber to generate based on a detection result of the running state detector, and determine a current value of the control current based on a result of the calculation, thereby performing normal control,
- wherein the damping force adjustable shock absorber is adapted to generate a hard characteristic by a current value larger than a current value of the control current corresponding to a soft characteristic,
- wherein the controller performs initialization control, according to which the controller switches the control current to a current value larger than the current value for instructing the damping force of the soft characteristic, and after that, performs the normal control, and
- wherein the controller performs the initialization control after a piston speed of the damping force adjustable shock absorber reaches or exceeds a predetermined speed.
4 more elements
A suspension control apparatus comprising:
- a damping force adjustable shock absorber disposed between a body and each wheel of a vehicle, the damping force adjustable shock absorber being capable of adjusting a damping force characteristic by adjustment of a control current to be supplied to a solenoid;
- a running state detector adapted to detect a running state of the vehicle;
- a controller adapted to calculate a damping force that the controller causes the damping force adjustable shock absorber to generate based on a detection result of the running state detector, and determine a current value of the control current based on a result of the calculation, thereby performing normal control;
- and
- a temperature monitoring unit adapted to monitor a temperature of a control valve of the damping force adjustable shock absorber,
- wherein the damping force adjustable shock absorber is adapted to generate a hard characteristic by a current value larger than a current value of the control current corresponding to a soft characteristic,
- wherein the controller performs initialization control, according to which the controller switches the control current to a current value larger than the current value for instructing the damping force of the soft characteristic, and after that, performs the normal control, and
- wherein the controller performs the initialization control according to the temperature of the control valve.
5 more elements
Dependencies are inferred from the claim text.