A stability control system 24 for an automotive vehicle as includes a plurality of sensors 28-37 sensing the dynamic conditions of the vehicle and a controller 26 that controls a distributed brake pressure to reduce a tire moment so the net moment of the vehicle is counter to the roll direction. The sensors include a speed sensor 30 , a lateral acceleration sensor 32 , a roll rate sensor 34, and a yaw rate sensor 20. The controller 26 is coupled to the speed sensor 30, the lateral acceleration sensor 32, the roll rate sensor 34, the yaw rate sensor 28. The controller 26 determines a roll angle estimate in response to lateral acceleration, roll rate, vehicle speed, and yaw rate. The controller 26 changes a tire force vector using brake pressure distribution in response to the relative roll angle estimate.

Roll over stability control for an automotive vehicle

A vehicle includes a control system that is used to control a vehicle system. The control system determines a roll condition in response to a yaw rate sensor and a pitch rate sensor without having to use a roll rate sensor. A relative roll angle, relative pitch angle, global roll angle, and global pitch angle may also be determined. A safety system may be controlled in response to the roll condition, roll angle, or the pitch angles individually or in combination.

Integrated vehicle control system using dynamically determined vehicle conditions

A system (18) for controlling a safety system (44) of an automotive vehicle (10) includes a longitudinal acceleration sensor (36), a vehicle speed sensor (20), a lateral acceleration sensor (32), a yaw rate sensor, and a controller (26). The controller (26) determines a reference pitch in response to the longitudinal acceleration signal and the vehicle speed signal and a reference roll angle in response to the yaw rate signal, the wheel speed signal and the lateral acceleration signal. The controller (26) determines a roll stability index and a pitch stability index. The controller (26) determines an adjusted pitch angle in response to the reference pitch angle and the pitch stability index and an adjusted roll angle in response to the reference roll angle and the roll stability index. The controller (26) controls the safety system (44) in response to the adjusted roll angle and the adjusted pitch angle.

Attitude sensing system for an automotive vehicle relative to the road

A vehicle control system includes a housed sensor cluster generating a plurality of signals. An integrated controller includes a sensor signal compensation unit and a kinematics unit, wherein the sensor signal compensation unit receives at least one of the plurality of signals and compensates for an offset within the signal and generates a compensated signal as a function thereof. The integrated controller further generates a kinematics signal including a sensor frame with respect to an intermediate axis system as a function of the compensated signal and generates a vehicle frame signal as a function of the kinematics signal. A dynamic system controller receives the vehicle frame signal and generates a dynamic control signal in response thereto. A safety device controller receives the dynamic control signal and further generates a safety device signal in response thereto.

Integrated sensing system

An improved electro-hydraulic brake system having features for improving the pedal feel of the system, while further having design features which contribute to the economy of manufacture of certain components of the system. The system provides for an electrically powered normal source of pressurized hydraulic brake fluid, and a manually powered backup source of pressurized hydraulic brake fluid to the vehicle brakes in the event of failure of the normal source. During normal braking, fluid from the backup source is redirected from the vehicle brakes to a pedal simulator. The pedal simulator preferably includes arrangements of spring loaded pistons, expansion volumes, and damping orifices, together with valves selectively controlling the flow of fluid to and from the pedal simulator which provides for an improved pedal feel during vehicle braking. The brake system of the invention further includes a relatively low cost fluid separator unit which is provided which prevents intermixing of pressurized fluid between the backup source and the normal source. The fluid separator unit acts to permit the normal source to act upon the hydraulic brake fluid of the backup source to operate the vehicle brakes. The fluid separator unit is preferably embodied as a piston having two working faces, each of the same diameter.

Electronic brake management system with manual fail safe

The longitudinal force operating on the whole vehicle is computed by the processor control and divided among the separate wheels w.r.t their comparative loadings. The latter is determined when stationary and is corrected w.r.t the dynamics of the vehicle. Motion sensors monitor the longitudinal movement of the vehicle as well as lateral movements. The longitudinal forces can be simple braking forces and controlled by separate brake pressures. The system can be extended to torque control for the driven wheels. The control computes the position of the centre of mass and computes the effects on the vehicle motion changes due to the position of the centre-of-mass (gravity). ADVANTAGE - Improved vehicle handling, improved braking and safety.

Braking and acceleration control for vehicle - involves computing individual longitudinal forces operating on wheel and optimising braking distribution or torque distribution

A braking force control system of a vehicle includes a deviation reference control quantity determining device for determining an operation control quantity for the actuator on the basis of a deviation between a target deceleration determined on the basis of a quantity of operation of a brake operating member and a detected deceleration of the vehicle. In this control system, the level of operation speed is judged in accordance with whether or not the variation per unit time in quantity of operation of the brake operating member exceeds a preset value. Following two states are switched over from one to another by a switch device: a state 1) in which the operation of the actuator is controlled with an operation control quantity determined in the deviation reference control quantity determining device, when it is decided that the operation speed is slow or low, and a state 2) in which the operation of the actuator is controlled with an operation control quantity determined in an operation quantity reference quantity determining device for determining the operation control quantity on the basis of the quantity of operation of the brake operating member, when the operation speed is fast or high. Thus, the generation of an overshooting can be avoided to improve the responsiveness.

Braking force control system of vehicle

An appliance maintenance apparatus for contactlessly detecting the operation states of appliances and operating the appliances in response to the operation states of the appliances, and an appliance remote maintenance system which comprises a plurality of appliance maintenance apparatuses, and a remote diagnosis control apparatus which is communicatable with the appliance maintenance apparatus through a public network to ensure the remote diagnosis control of the appliance maintenance apparatus from a remote place.

Appliance maintenance apparatus and appliance remote maintenance system

PURPOSE: To provide always a satisfactory operating feeling in a pressure accumulating chamber of a stroke accumulator communicating to a reaction chamber in a booster body by giving a spring property for increasing smoothly repulsion along a quadric curve to the stroke accumulator. CONSTITUTION: A fluid pressure booster B connected to the rear portion of a master cylinder M has a control piston 15 fitted in a pair of front and rear sleeves 13, 14 fitted in a cylinder bore 12 of a booster body 11, and a valve piston 22 and reaction piston 23 are fitted in a cylinder bore 21 of said piston 15. A reaction chamber 49 defined between both pistons 22, 23 communicates to a pressure accumulating chamber 46 of a stroke accumulator 45. Then, the stroke accumulator 45 is constituted of springs 58 1 -58 n for urging a first piston 56 defining the pressure accumulating chamber 46, a plurality of second pistons 57 1 -57 n arranged coaxially therewith, springs 58 1 -58 n urging the second pistons 57 1 -57 n to the first piston 56 side and increasing respectively spring constants sequentially and the like. COPYRIGHT: (C)1991,JPO&Japio

Fluid pressure booster

A brake system for a vehicle includes a liquid pressure generating device for generating a liquid pressure for braking dependent upon a manual operation, an actuator for generating a liquid pressure for braking dependent upon an electrical command signal, and an electromagnetic switchover valve which is switchable between a first state in which a wheel brake is connected to the liquid pressure generating device upon deenergization of the electromagnetic switchover valve, and a second state in which the wheel brake is connected to the actuator upon energization of the electromagnetic switchover valve The brake system further includes a controller The controller determines whether the regulation of braking force is necessary depending upon the behavior of the vehicle or a wheel, determines an amount of braking force required to be generated by the brake, and determines an electrical command signal to be applied to the actuator, dependant upon the required amount of braking force, when the regulation of brake force is necessary Further, the controller controls the switching operation of the electromagnetic switchover valve device between the first state in which the regulation of braking force is unnecessary, and the second state in which the regulation of braking force is necessary The switching of states may be based upon an elapsed time or based upon equalizing pressures between the actuators and the liquid pressure generating device Thus, it is possible to reduce the frequency of operation of each of the actuator and the electromagnetic switchover valve device and to eliminate the need for a stroke accumulator, thereby providing a simplified structure

Kazuya Sakurai

Papers

Braking and acceleration control for vehicle - involves computing individual longitudinal forces operating on wheel and optimising braking distribution or torque distribution

Braking force control system of vehicle

Appliance maintenance apparatus and appliance remote maintenance system

Fluid pressure booster

Brake System for vehicle