摘要:
A solenoid valve driving device includes a bypassing current path of which one end is connected to a point between a first switching device and a first solenoid valve and another end is connected to a point between a second switching device and a second solenoid valve, and an element disposed in the bypassing current path and having a characteristic that causes current to flow from the first switching device side to a second switching device side. By adopting the above described constitution, through current generated when the first switching device is switched from an OFF-state to an ON-state during duty control of the first switching device can be suppressed by the inductance of the second solenoid valve. In this way, one solenoid valve among a pair of the first and second solenoid valves, which is not operated, has a function of suppressing the through current.
摘要:
A brake control device for a vehicle, which controls a pressure difference control valve and a pump provided at a main and a auxiliary conduits respectively to control a flow of brake fluid supplied from a master cylinder to a wheel cylinder, includes a determining step for determining whether or not to execute a brake control in an emergency situation, a first control step for controlling the pressure difference control valve to be in a pressure difference generating state and for controlling the pump to supply the brake fluid to the main conduit through the auxiliary conduit, and a second control step for controlling the pressure difference control valve to be in a fluid communicating state, and for controlling the pump to supply the brake fluid to the main conduit through the auxiliary conduit, wherein the second control means is executed before the first control means in the emergency situation.
摘要:
During a time period of from a time that is immediately before a vehicle being stopped to a time of the vehicle being stopped, a pressure increase gradient in braking fluid pressure which is applied to wheel cylinders of rear wheels is made to be larger than a pressure increase gradient that prevailed until a time that was immediately before the vehicle being stopped. As a result, a pitching motion that occurs in a vehicle body can be suppressed.
摘要:
In a braking pressure control apparatus for a vehicle, a first valve connected between a hydraulic pressure source and a wheel cylinder serves to permit and inhibit a supply of brake fluid to the wheel cylinder from the hydraulic pressure source. A second valve connected between the wheel cylinder and a reservoir serves to permit and inhibit an escape of the brake fluid from the wheel cylinder toward the reservoir. A control device serves to output control signals to the first and second valves respectively to control the braking pressure in the wheel cylinder in response to a detected running condition of the vehicle. The control device includes a deciding section for deciding whether or not a small variation in the braking pressure in the wheel cylinder should be done on the basis of the detected running condition of the vehicle, and an outputting section for, when the deciding section decides that the small variation in the braking pressure in the wheel cylinder should be done, simultaneously outputting the control signals to the first and second valves to simultaneously execute the supply of the brake fluid to the wheel cylinder and the escape of the brake fluid from the wheel cylinder.
摘要:
An anti-skid control system for use in a motor vehicle includes a two-position type control valve for performing increase and decrease in the braking pressure supplied to a wheel braking cylinder for braking a wheel of the motor vehicle. The control valve is operated in accordance with a signal indicative of a duty ratio from an electronic control unit. The electronic control unit estimates a balanced duty ratio whereby the current braking pressure in the wheel braking cylinder is maintained as it is and determines the duty ratio on the basis of the estimated balanced duty ratio in accordance with the locking state of the wheel.
摘要:
An automotive engine throttle control device has a function for effecting traction control for reducing the engine throttle opening upon detection of any slip of driving wheels and a function for effecting an automatic drive control for controlling the vehicle cruising speed in conformity with a command speed. The device has a first lever operatively connected to an accelerator and a second lever operatively connected to the throttle valve. A spring is disposed to resiliently act between the first and second levers. The second lever is actuated by an actuator which operates in response to throttle opening control instructions.
摘要:
A brake control apparatus for automotive vehicles is provided which has two separate hydraulic brake lines leading to wheel cylinders and performs a brake assisting operation to hold the wheel cylinder pressure higher than the master cylinder pressure in each of the hydraulic brake lines when a brake pedal is depressed by a vehicle operator. The brake control apparatus also includes a fluid pressure difference regulator which regulates a pressure difference between the two hydraulic brake lines so as to fall within a given allowable pressure range, thereby minimizing adverse effects on the brake assisting operation which are caused by electric and/or mechanical performance difference between the two hydraulic brake lines.
摘要:
In a wheel slip prevention control system for preventing the slippage of the driven wheel occuring when a vehicle is accelerated, a reference speed is derived from the non-driven wheel speed and the driven wheel speed is corrected by a correction value obtained as a function of a driven wheel acceleration value and a non-driven wheel acceleration value. The throttle valve is controlled with speed corresponding to the slipping condition of the driven wheel, i.e., with a control speed derived as a function of the reference speed and the corrected driven wheel speed, so that the slippage is quickly and effectively prevented.
摘要:
Disclosed herein is a vehicle running control device having a slip preventing function where a throttle opening degree of an engine is decreased upon occurrence of slip on drive wheels at starting and acceleration to prevent slip, and a running speed control function where a vehicle running speed is controlled to a target value. The control device comprises a common drive source for the above-mentioned both functions, a reduction mechanism for generating a drive output reduced discretely by driving the drive source in a predetermined direction and in a reverse direction, and link mechanism for effecting an open/close control of a throttle by the drive output. In the running speed control operation, the open/close control of the throttle is effected through the reduction mechanism and the link mechanism by intermittently controlling a driving operation of the drive source in the predetermined direction. On the other hand, upon occurrence of the slip on the drive wheels, the throttle opening degree is decreased to prevent the slip by intermittently controlling a driving operation of the drive source in the reverse direction through the reduction mechanism and the link mechanism. Further, the link mechanism is provided with a damper mechanism for damping a repulsive force to an acceleration operating section due to forcible decrease in the throttle opening degree in the slip preventing operation.
摘要:
The present invention is directed to a vehicle motion control apparatus, which includes normally open valves to supply hydraulic pressure discharged from a master cylinder into wheel brake cylinders, normally closed valves to reduce the wheel cylinder pressure, and a proportional pressure difference valve which is disposed between the master cylinder and the normally open valves, to regulate a pressure difference between the hydraulic pressure at the side of the master cylinder and the hydraulic pressure at the side of the normally open valves to be of a desired value. A pressure generating device is provided for generating the hydraulic pressure independently of the master cylinder to supply it into a passage between the pressure difference valve and the normally open valves. The normally open valve connected to one of the wheel brake cylinders in one hydraulic circuit, is placed in its closed position, and the normally open valve connected to the other one of the wheel brake cylinders, is placed in its open position, and then the pressure difference valve is controlled on the basis of the monitored vehicle state variable.