A coordinated brake control system is for a hybrid brake system including a regenerative brake unit and a friction brake unit for a vehicle and is arranged to generate a total braking torque which is a combination of a regenerative braking torque generated by the regenerative brake unit and a friction braking torque generated by the friction brake unit, so as to bring the total braking-torque closer to a target braking torque, and to limit a rate of change of the regenerative braking torque according to a response delay of the friction braking torque when a first distribution ratio of the generative braking torque relative to the total braking torque is decreased and when a second distribution ratio of the friction braking torque relative to the total braking torque is increased

Coordinated brake control system

The present invention is directed to a brake control system for an electrically operated vehicle which is adapted to add a hydraulic braking operation to a regenerative braking operation, or change the former for the latter, rapidly and smoothly. An electric motor is operatively connected to a wheel for rotating the wheel, and a motor control unit for controlling the electric motor to apply a rotating force and a regenerative braking force to the wheel. In a main passage for connecting a master cylinder with a wheel brake cylinder, a pressure limit changeover device is disposed. The changeover device includes a first pressure limit device which is adapted to close the main passage when a master cylinder pressure is lower than a first predetermined pressure, and open the main passage when the master cylinder pressure exceeds the first predetermined pressure, and a second pressure limit device which is adapted to close the main passage when the master cylinder pressure is lower than a second predetermined pressure which is lower than the first predetermined pressure, and open the main passage when the master cylinder pressure exceeds the second predetermined pressure. First and second valve devices for opening or closing the main passage are connected to the main passage in parallel with the first pressure limit device, and the second valve device is connected in series of the second pressure limit device.

Brake control system for an electrically operated vehicle

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 vehicle braking control apparatus is configured to suppress the effect on the vehicle behavior when braking torque is reassigned between the wheels. The distribution of braking torques is reassigned between the front and rear wheels so as to increase the amount of braking carried out by regenerative braking while maintaining a constant total braking torque. When the frictional braking of the one pair of wheels is reassigned to the regenerative braking of the other pair of wheels, the amount reassigned to left and right of the wheels is adjusted in accordance with the steering angle.

Vehicle braking control apparatus

A braking system for an electromobile includes a relief valve VR2 for restricting a braking pressure to front wheel cylinders WC3, WC4, a bypass valve V5 connected in parallel to the relief valve VR2, a solenoid valve V1 interposed between the relief valve VR2 and booster HB and a solenoid valve V4 interposed between a pressure line 13 from the booster HB to the front wheel cylinders WC3, WC4 and a pressure line 12 from the booster HB to rear wheel cylinders WC1, WC2. During a regenerative braking by the use of an electric motor for driving front wheels WFL, WFR, a braking pressure is applied through the solenoid valve V1 and the relief valve VR2 to the wheel cylinders WC3, WC4. When the regenerative braking is interrupted, the solenoid valve V1 is closed and the bypass valve V5 and the solenoid valve V4 are opened.

Braking system for motor driven vehicle

PURPOSE:To correct imbalance of total brake force caused by the fact that the regenerative brake force under high speed is different from that under low speed CONSTITUTION:Hydraulic pressure is interrupted through a reducing valve 30 under high speed while through reducing valves 30, 32 under low speed Hydraulic brake functions when a differential pressure DELTAP exceeds the open valve level of the reducing valve 30 under high speed or when the differential pressure DELTAP exceeds the total open valve level of the reducing valves 30, 32 An ECU 16 performs regenerative braking of a motor 14 based on the differential pressure DELTAP Since hydraulic brake functions under low speed only when the differential pressure DELTAP is higher than that under high speed, overbrake is prevented under low speed

Brake controller for electric automobile

PURPOSE: To control the rapid sinking of a brake pedal, the generation of an oil violent sound and a G shock and the like due to stepwise rapid deceleration when a regenerative braking mode is changed over to an ABS mode and at the same time to prevent the braking distance of a vehicle from being extended. CONSTITUTION: This braking device comprises a valve means including relief valves 6, 56 and by-pass valves 7, 53 and the like for controlling the transmission of a hydraulic pressure to a wheel cylinder 5 (Fr) and a wheel cylinder 5 (Rr) from a master cylinder 4 and a skid detection means for detecting the slip ratio of the wheel of a front wheel Fr and/or a rear wheel Rr, and when the slip ratio of not less than a predetermined value is detected by the skid detection means, the regeneration due to regenerative braking is reduced and the operation of regenerative braking is changed over to the operation of hydraulic braking.

Braking device of motor car

PROBLEM TO BE SOLVED: To maintain an excellent brake operation feeling even at the time of selection from a regenerative braking to a hydraulic pressure braking in a braking control device using both the regenerative braking and the hydraulic pressure braking. SOLUTION: A reservoir 61 for boosting in which a specified amount of brake fluid is contained is connected between a hydraulic pressure limit selecting means RD having a differential pressure valve (relief valve 21) and a first switch valve 22 and wheel cylinders 51 and 52, Also a second switch valve 62 is provided in a hydraulic pressure path for connecting an area between the hydraulic pressure limit selecting means RD and the wheel cylinders 51 and 52 to the reservoir 61 for boosting. and the delivery side of a hydraulic pump 43 is connected to a hydraulic pressure line for connecting an area between the hydraulic pressure limit selecting means RD and wheel cylinders 51 and 52 to the second stop valve 62. Then a check valve 63 is provided in a hydraulic pressure line for connecting an area between the reservoir 61 for boosting and the second switch valve 62 to the suction side of the hydraulic pressure pump 43.

Braking control device for motor-driven vehicle

PROBLEM TO BE SOLVED: To surely separate two systems comprising a hydrodynamic system and a hydrostatic system from each other and to provide an appropriate simulator function. SOLUTION: The first pressure chamber 74 and the second pressure chamber 75 on both sides of a piston 71 in a sub cylinder 70 are individually connected to a solenoid switching valve 61, which is arranged in parallel to a fluid pressure limiting switching device 20 arranged between a master cylinder 2 and wheel cylinders 51, 52, and to a solenoid switching valve 62 arranged between a regulator 3 and a reservoir 4. When regenerative braking based on an electric motor 11 is carried out, the solenoid switching valves 61, 62 are switched so that the first pressure chamber 74 is connected to the master cylinder 2 and the second pressure chamber 71 is connected to the low pressure reservoir 4. When regenerative braking based on the electric motor 11 is stopped, or when regenerative braking power is reduced, the solenoid switching valves 61, 62 are switched so that the first pressure chamber 74 is connected to the wheel cylinders 51, 52 and the second pressure chamber 75 is connected to the regulator 3.

Brake controller for electric motor vehicle

PURPOSE:To collect energy efficiently by executing regenerative braking suitably and also to attain a balance with a braking force of non-regenerative wheels in an electric vehicle. CONSTITUTION:A hydraulic valve 70 is provided for a hydraulic system from a brake master cylinder 54. A charged state of a battery 48 is detected by battery ECU 94 and a maximum regenerative braking force which can be given to front wheels 42 and 44 by regeneration is computed. In the case when a requested braking force by treading of a brake pedal 52 is less than the maximum regenerative braking force, the braking force is supplied by the regeneration. In the case when the requested braking force becomes the maximum regenerative braking force or more, the hydraulic valve 70 is controlled to distribute an oil pressure of the brake master cylinder 54 to front and rear wheels and the distribution of the braking force to the front and rear wheels is controlled properly. For the proper distribution of the braking force, a control for making a frictional braking force of rear wheels 72 and 74 rise sharply or delaying a rise of the frictional braking force of the front wheels 42 and 44 is executed.

治美大堀

Papers

Brake controller for electric automobile

Braking device of motor car

Braking control device for motor-driven vehicle

Brake controller for electric motor vehicle

Braking equipment of electric vehicle

治美 大堀

Papers

Brake controller for electric automobile

Braking device of motor car

Braking control device for motor-driven vehicle

Brake controller for electric motor vehicle

Braking equipment of electric vehicle

治美大堀