Abstract: A wheel slip control system used for a vehicle comprising: a pressure source selector being informed of a first pressure of a first pressure source and a second pressure of a second pressure source and adapted to select one of the first and second pressure source, a slip controller receiving a first adjustment signal for anti-skid control to adjust the first pressure provided by the pressure source selector or receiving a second adjustment signal for traction control to adjust the second pressure provided by the pressure source, selector a brake slip detector detecting the state of slipping of wheels during a braking operation of the vehicle and producing a brake slip signal, an acceleration slip detector detecting the state of slipping of wheels during an accelerating operation of the vehicle, a second throttle valve being placed at an intake air path provided with a first throttle valve interlocked to an acceleration increase member; and an electronic controller receiving the brake slip signal and providing

Abstract: A wheel slip control system used for a vehicle includes a pressure source selector which selects one of the first pressure source providing a first pressure and a second pressure source providing a second pressure depending on the difference of the two pressures, a slip controller which adjusts the first pressure in response to a first adjustment signal or adjusts the second pressures in response to a second adjustment signal and thereafter operates to suppress slipping of the wheels including the driven wheels, a brake slip detector which produces a brake slip signal upon detection of a slip during braking operation, an acceleration slip detector which produces an acceleration slip signal upon detection of a slip during accelerating operation, and an electronic controller which provides the first adjustment signal to the slip controller based on the brake slip signal for the purpose of vehicle anti-skid control and provides the second adjustment signal to the slip controller based on the acceleration slip si

Abstract: A method is described for ascertaining the set-point braking moment for the various wheels of a vehicle, in which to this end, signals dependent on the wheel speeds V.sub.Ri and the vehicle speed V.sub.F are used. The signals from which the set-point braking moments are ascertained are obtained by sending the signals corresponding to the wheel speeds and the vehicle speed through an especially embodied Kalman filter.

Abstract: Disclosed is an automatically self-locking chock for semi-trailers parked in a truck loading yard having: A freely movable dolly platform above a load support member; at least one pair of pivoted chock plates at a distance from the platform such that the dolly support for the forward end of the trailer will rest on the platform when the chock plates are positioned next to the wheels of the trailer; a lever member connecting the platform to the chock plates, constructed such that when the platform carries a load and is pressed against the load support member the chock plates are pivoted upward against the treads of the trailer wheels by mechanical magnification of the downward movement of the platform; and a positioning member for holding the lever member, when the platform is unloaded, in a position such that the chock plates are parallel to and approximately in the plane of the roadbed on which the trailer rests and the dolly platform is positioned above and away from the load support member.

Abstract: A keyboard arrangement for computer equipment in which the full set of keys is utilized for computing functions has a restricted set of the full set of keys used for operating a telephony function. The equipment is normally mainspowered, but in the event of mains failure, only the restricted set of keys is scanned by means envisaged from standby battery power, thereby reducing the power required from the battery.

Abstract: In a document feeding apparatus, a document table carrying documents is provided with a stopper plate. The stopper plate can move between a stop position to retain the documents on the document table and a release position to allow the documents on the document table to move by the force of gravity. A first guide plate to guide the forward edges of the documents is provided on the lower-course side of the document table with respect to the document feeding direction. An obtuse angle is formed between the plane containing the first guide plate and the plane containing the document table. The forward edges of the documents transferred from the document table are guided by the first guide plate so that they are trued up in an oblique manner. On the document feeding side of the guide plate intake rollers are arranged which pick up and deliver, one by one, the documents guided by the guide plate in an orderly manner.

Abstract: An air suspension comprises a shock absorber having a piston rod in which a control rod for adjusting damping force is disposed, an air spring having a main air chamber and an auxiliary air chamber, a valve body for affording and shutting off communication between both air chambers to adjust the spring constant of the air spring, a support connected to a car body and including a rigid member with which the piston rod is coupled and in which the valve body is disposed and a bushing disposed diametrically outward of the rigid member and having a hole opened to the auxiliary air chamber and an actuator fixed to the piston rod above the support to operate the control rod and valve body. The actuator is provided with an electric motor, a gear fixed to the motor and a pair of rods arranged parallel to each other and extending toward the rigid member of the support, one of the rods being connected to the control rod and the other rod being connected to the valve body respectively.

Abstract: In accordance with the present invention, a normally open isolation valve is connected between a master cylinder and the selected wheel brakes, and a normally closed dump valve is connected between the selected wheel brakes and a fluid accumulator. A computer control module is connected to operate the isolation valve and the dump valve. In operation, when a slip condition of the controlled wheels is detected, the computer control module closes the isolation valve to hold fluid pressure to the controlled brakes at a relatively constant level. If the deceleration of the controlled wheels exceeds a predetermined amount, the computer control module will selectively open the dump valve to enable fluid to flow into the accumulator, thereby reducing the deceleration of the associated wheels.

Abstract: A brake control system is described that prevents a wheel lockup condition by identifying the brake pressure that produces the maximum possible braking effort during each brake pressure application period and applying the identified pressure after an incipient wheel lockup condition is sensed. Constants in an expression estimating the braking effort are adaptively adjusted to compensate for changes in system parameters over time.

Abstract: A pipe-type housing for a shock absorber has a bearing eye at one end for a fastening member. The housing is formed of a welded or continuous seamless steel pipe formed at one end by hot or cold extrusion to provide a flattened portion with two spaced generally parallel surfaces. Each of the surfaces has an opening aligned with the opening in the other. A flange extends around each opening and projects inwardly relative to the flattened section toward the other flange, however, the flanges are spaced apart. In the deformation of the pipe a transition wall is formed between the flattened part and the remaining part with the normal pipe cross-section. A base is inserted into the normal pipe cross-section abutting the transition wall. The base is sealed with the inner circumferential surface of the pipe by a seal ring fitted into a circumferentially extending groove in the base.

Abstract: An anti-lock braking system having a wheel brake, a hydraulic control circuit for controlling the supply of a hydraulic control pressure to the wheel brake, and an electronic control circuit for energizing the hydraulic control circuit so as to reduce the hydraulic braking pressure applied to the wheel brake when the wheel is about to be locked due to the rotational speed characteristics thereof, characterized in that the electronic control circuit has the function of detecting the condition of a road surface on which a vehicle runs, and is formed in such a manner that, when the electronic control circuit judges that the road surface is rough, it is operated so that it employs the highest wheel speed of the two wheel speed signals, and when the road surface is judged not to be rough respective wheel speed signals are employed by the electronic control circuit for operation of their respective hydraulic control circuits.

Abstract: In an antiskid control system for the hydraulic braking system of a wheeled vehicle, the rotational speed of a vehicle wheel and the acceleration of the wheel are detected and levels of road surface friction are determined on the basis of the wheel speed and acceleration to give a first indication that the road has a high value of friction or a second indication that the road has a low value of friction. The wheel speed and acceleration are analyzed to detect a down-pressure mode to decrease the fluid pressure of the braking system and an up-pressure mode to increase the pressure. In response to the presence of the first indication, the down-pressure mode is effected at a lower rate and then at a higher rate. In response to the occurrence of the second indication, the down-pressure mode is effected at the higher rate.

Abstract: A brake control system is described that prevents a wheel lockup condition by identifying the brake pressure that produces the maximum possible braking effort during each brake pressure application period and applying a predetermined fraction of the identified pressure after an incipient wheel lockup condition is sensed. The predetermined fraction provides for adaptive adjustment of the brake pressure if the identified brake pressure is in error until a pressure is applied that produces substantially the maximum possible braking effort.

Abstract: A gas spring unit with an improved packing structure for providing a lubricated guide and seal with the piston rod for containing a high-pressure gas while enabling the spring unit to function for a large number of operational cycles. The packing structure includes a pair of lubricating-type bushings disposed for slidable engagement with the piston rod, which bushings are axially spaced and confine a seal ring therebetween, the latter preferably being of polyurethane. The bushings are preferably impregnated with a lubricant such as graphite. The innermost bushing abuts against a shoulder on the housing to avoid imposition of excessive compressive forces on the seal ring.

Abstract: A brake control system has a proportioning valve for controlling distribution of fluid pressure to at least rear wheel cylinders with respect to the fluid pressure built-up in a master cylinder. The split point of the proportioning valve is variable depending upon load distribution between front and rear wheels and overall load applied on the vehicle. In order to perform braking pressure distribution control, a controller is provided for setting set pressure for the proportioning valve, which set pressure defining the split point of the proportioning valve. The controller is connected to load sensors monitoring load condition at front part and rear part of the vehicle. The controller received front part load indicative signal and a rear part load indicative signal from the load sensors to derive load distribution and overall load on the vehicle, and whereby derives the set pressure of the proportioning valve.

Abstract: An anti-skid brake control system includes a detector for detecting the peak value of wheel acceleration in each cycle of skid control. The period of braking pressure increased is adjusted depending upon the detected peak value of the wheel acceleration. The duration for which the brake pressure increase operation continues corresponds to the period of time necessary for the pressure to increase to approximately a projected or assumed lock pressure. After this duration has expired, the braking pressure is held at the constant value obtaining at the end of the duration. Therefore, the braking pressure is maintained at approximately the lock pressure. By holding the braking pressure at constant value for a fixed period of time, optimal braking characteristics can be achieved.

Abstract: The present invention starts from a vehicle hydraulic brake system comprising a master cylinder (2) actuatable by a hydraulic power booster (1) and containing a working chamber (12, 21), to which latter wheel brakes (36, 37, 38, 39) are connected by way of valves (40, 41) controllable by a slip control electronics. On control action, pressure fluid can be taken from the wheel brakes (36, 37, 38, 39) through the valves (40, 41) and can be replenished out of the presser chamber (5) of the hydraulic power booster (1) by way of the working chamber of the hydraulic power booster by way of the working chamber (12, 21). On communication of the working chamber (12, 21) with the pressure chamber (5) of the hydraulic power booster (1), simultaneously, a resetting sleeve (11) is pressurized in the brake's release direction which is penetrated by a master cylinder piston (10) and which serves to limit the stroke of the brake pedal (6).

Abstract: A hydraulic brake system with slip control for automotive vehicles, comprises a master cylinder (2) pressurizable by a hydraulic power booster (1), in which system valve members (39, 40, 43, 44, 47) are inserted between the master cylinder (2) and the wheel brakes (45, 46, 41, 42) connected thereto which serve to remove pressure fluid from the wheel brakes (41, 42, 45, 46). Pressure fluid taken from the wheel brakes (41, 42, 45, 46) is replenished out of the pressure chamber (6) of the hydraulic power booster (1). A stroke limitation of the brake pedal (7) is effected during slip control.

Abstract: An anti-skid brake control system comprises a detector for detecting the peak value of wheel acceleration in each cycle of skid control. Braking pressure is increased in step-wise fashion by alternately operating a pressure control valve between an application mode in which working fluid is supplied to a wheel cylinder to increase the braking pressure and a hold mode in which the wheel cylinder is blocked from fluid communication to a hydraulic brake circuit to hold the braking pressure constant. The duration for holding the pressure control valve in the application mode is adjusted depending upon the detected peak value of wheel acceleration, whereby an average increasing rate of braking pressure is variable depending upon the peak value of the wheel acceleration.

Abstract: Adaptive ride air suspension strut with internal actuator within hollow piston rod which is operatively connected to a computer control system through electrical bulkhead and high pressure seal which is connected to by cables leading upwardly therefrom through a special wire routing and sealing type dress cap fitted to the hollow end of the strut to guide and direct the cables to a plug connected to the control system.