A vehicle brake device includes a master cylinder having a master piston moved by servo pressure in a servo chamber and master pressure of a master chamber is changed by movement of the master piston. A mechanical servo pressure generating unit is connected to a high pressure source and the servo chamber, and generates a servo pressure within the servo chamber according to pilot pressure within a pilot chamber based on brake fluid pressure of the high pressure source. An electrical pilot pressure generating unit is connected to the pilot chamber and generates desired pilot pressure within the pilot chamber, and a master chamber-to-pilot chamber brake fluid line connects the master chamber with the pilot chamber so pilot pressure is generated by the pilot pressure generating unit during normal operation of a power supply system, and the master pressure is used as pilot pressure when the power supply system fails.

Vehicle brake device

In a hydraulic brake device, a pressurizing chamber receives a master cylinder pressure generated by a master cylinder. A pressure adjusting chamber receives an accumulator pressure generated by a high pressure source. A booster piston is movably provided between the pressurizing chamber and the pressure adjusting chamber. The booster piston is actuated in a first direction away from the pressurizing chamber by a pressure in the pressurizing chamber and actuated in a direction opposite to the first direction by a pressure in the pressure adjusting chamber. A flow control mechanism responsive to a movement of the booster piston is provided. The flow control mechanism makes the pressure adjusting chamber open to the high pressure source when the booster piston is moved in the first direction exceeding a predetermined distance, and closes the pressure adjusting chamber to be cut off from the high pressure source when the booster piston is moved in the opposite direction back to an initial position. The hydraulic brake device allows a boosted pressure in the pressure adjusting chamber to be produced based on the accumulator pressure when a malfunction in an electrical system is detected, and supplies the boosted pressure into a wheel cylinder.

Hydraulic brake device

A hydraulic brake apparatus for use in a vehicle having wheels and a brake operating member manually operable by a driver, the apparatus including a manual pressure source including (a) a hydraulic booster which boosts an operating source applied by the driver to the brake operating member and produces a first hydraulic pressure corresponding to the boosted operating force, and (b) a master cylinder which produces a second hydraulic pressure corresponding to the boosted operating force as an output of the hydraulic booster; a power pressure source which produces, by utilizing a power, a third hydraulic pressure irrespective of whether the brake operating member is operated hydraulic brakes which are provided in association with the wheels, respectively, and include respective brake cylinders, and each of which, upon supplying of a hydraulic pressure to a corresponding one of the brake cylinders, applies a hydraulic braking force to a corresponding one of the wheels; a hub portion which is connected to each of the brake cylinders and to which the hydraulic booster the master cylinder, and the power pressure source are connected in parallel; and a pressure-source communication control device which selectively allows at least one of the hydraulic booster, the master cylinder, and the power pressure source to communicate with the hub portion.

Hydraulic brake apparatus

A brake control apparatus is configured to suppress fluctuations in the deceleration when transferring from cooperative braking to regenerative braking or hydraulic braking The brake control apparatus calculates a braking torque command value feed forward component for reaching a target deceleration corresponding to the master cylinder pressure according to an ideal reference model The brake control apparatus also calculates the braking torque command value feedback component to find a base deceleration for feeding back the difference between the base deceleration and the vehicle deceleration The brake control apparatus then calculates the braking torque command value by adding the components together After apportioning the braking torque command value into hydraulic and regenerative braking torque command values, the brake control apparatus phase compensates the braking torque command values to match their braking response characteristic with a vehicle model having a slower response characteristic than the ideal reference model

Brake control apparatus

A method and a device for detecting at least one sensor malfunction of at least one first sensor of at least one first vehicle, at least one first signal from the at least one first sensor of the at least one first vehicle being ascertained and this at least one first signal being compared according to predefined comparison criteria to at least one comparison variable, at least one further second signal from at least one second sensor of at least one further second vehicle being ascertained as this at least one comparison variable and the at least one sensor malfunction being detected in the at least one first vehicle as a function of the comparison.

Method and device for detecting at least one sensor malfunction of at least one first sensor of at least one first vehicle

PROBLEM TO BE SOLVED: To make own vehicle safely and precisely travel on the basis of vehicular information sent from another vehicle, a detecting device provided on a traveling road, and a base. SOLUTION: A sending/receiving device 38 receives vehicular information showing a state of a traveling road surface of a vehicle in front, a traveling state of the vehicle in front, and a driving operation state of the vehicle in front, and sends vehicular information detected and calculated by using various sensors and a microcomputer 21 in the own car. The microcomputer 21 controls various operation such as operation at braking the vehicle, operation at steering the vehicle, and operation for avoiding or easing contact with the vehicle in front, on the basis of the received vehicular information and the vehicular information about the own vehicle detected and calculated by the own vehicle. Furthermore, the microcomputer 21 detects abnormality in specified vehicular information on the basis of the above-mentioned various vehicular information.

Vehicular control device

PROBLEM TO BE SOLVED: To prevent any driving force being produced in a brake operation from occurring, and also to deter the lowering of braking effectiveness during the practice of control over an automatic braking system, pertaining to this braking force controller to be mounted on an electric vehicle. SOLUTION: When a slip ratio S of a wheel exceeds the specified threshold value S0 (time t3 ), automatic braking system control is started into started into operation. During the practice of this automatic braking system, in a state that the slip ratio S is more than the threshold value S0 (terms (t3 , t4 ), (t5 , t6 ), (t7 , t8 ), hydraulic braking force FL and regenerative braking force FG both are reduced to some extent. In a state that the slip ratio S is less than the threshold value S0 (terms t4 , t5 ), (t6 , t7 ), the regenerative braking force FG is kept in constant, whereas the hydraulic braking force FL is gently increased. If the regenerative braking force FG is reduced up to zero (time t9 ), subsequently, a reduction in this regenerative braking force FG is prohibited. Therefore, this regenerative braking force FG will in no case come to a negative value at all.

Braking force controller

(57) [Summary]
PROBLEM TO BE SOLVED: To provide a brake for controlling brake fluid pressure of a vehicle. Identify system failure details for The porpose is to do.
SOLUTION: Each vehicle has a master cylinder 16 whose hydraulic pressure is reduced. Wheel wheel cylinder pressure P W / C Master pressurizing Run. The accumulator 72 is reduced in hydraulic pressure so that Il cylinder pressure P W / C Execute BBW pressurization to adjust pressure You. The wheel cylinder pressure sensor 54, Output values pFR, pF output from 57, 62, 65 L, pRR, pRL and foil Output from the cylinder pressure sensors 54, 57, 62, 65 System based on the force values pFR, pFL, pRR, pRL. Identify the failure location of the system and its failure mode.

Brake hydraulic pressure control device

PROBLEM TO BE SOLVED: To always secure sufficient pressure intensifying ability and pressure reducing ability in a brake fluid pressure controller in which pressure intensifying control and pressure reducing control for a wheel cylinder are carried out. SOLUTION: Pressure intensifying control is carried out by feeding brake fluid in a reservoir tank 54, which is provided with an original position restoring function, to wheel cylinders 28, 30. Pressure reducing control is carried out by letting the brake fluid in the wheel cylinders 28, 30 flow to the reservoir tank 54. When restoration of the brake fluid in the reservoir tank 54 to a reference value is required, the reservoir tank 54 is pressurized by means of a master cylinder 12, and a piston 54 is displaced against energizing force of a spring 54d. As a large spring constant is provided in the spring 54d, the piston 54d is returned to the original position at once after a master cylinder pressure is removed.

Brake fluid pressure controller

PROBLEM TO BE SOLVED: To use effectively the pressure of an accumulator in a hydraulic pressure braking device that produces braking hydraulic pressure with the use of a master cylinder or the accumulator as the pressure source, if a failure occurs in the device. SOLUTION: A mechanical booster valve 26 holds therein a stepped piston 35 adapted to reciprocate by the balance in braking hydraulic pressure between a pressure chamber 45 and a pressure modulation chamber 46, and a ball 41 adapted to connect a high-pressure chamber 47 to the modulation chamber 46. The pressure chamber 45 is supplied with master cylinder pressure PM/ C, while the high-pressure chamber 47 is supplied with accumulator pressure PACC. The piston 35 traveling to the modulation chamber 46 over a predetermined stroke opens the ball 41 to intensify the hydraulic pressure in the modulation chamber 46. If a failure occurs in the device, the hydraulic pressure generated in the modulation chamber 46 is supplied to wheel cylinders.

文昭川畑

Papers

Vehicular control device

Braking force controller

Brake hydraulic pressure control device

Brake fluid pressure controller

Hydraulic pressure braking device

文昭 川畑

Papers

Vehicular control device

Braking force controller

Brake hydraulic pressure control device

Brake fluid pressure controller

Hydraulic pressure braking device

文昭川畑