Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control
Patent
1997-08-13
2000-01-18
Louis-Jacques, Jacques H.
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
Vehicle subsystem or accessory control
701 36, 701 38, 280 5514, 280 5515, G06F 776, G06G 770
Patent
active
060164549
ABSTRACT:
In the suspension control apparatus of the present invention, a CPU determines a desired damping force, based on an acceleration of a car body in a vertical direction, which is detected by an acceleration sensor, and also determines a PWM duty ratio corresponding to an intensity of a target current (an average intensity of the applied current) required for generating the desired damping force. Further, the CPU detects a voltage provided by a battery and adjusts the PWM duty ratio, based on the detected voltage value, so as to maintain a dither amplitude at a predetermined level. A PWM signal having the adjusted duty ratio is outputted to a transistor, to thereby apply a current which is obtained by superimposing a dither on the target current. By this arrangement, the dither amplitude can be maintained at a predetermined level, even when the voltage value changes, so that an undesirable increase in hysteresis with respect to a damping force can be avoided and pronounced noise and vibration of a proportional solenoid valve can be suppressed.
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Louis-Jacques Jacques H.
Tockico Ltd.
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