Advics Co., Ltd.

Denso Corporation

Shintaro Osaki

Hajime Kumabe

Yasuhiro Nakai

Satoshi Niwa

Kazunori Kadowaki

Masayoshi Takeda

Hiroyuki Kodama

Shotaro Fukuda

Syotarou Fukuda

Mitsuhiro Tokimasa

Takahiro Kiso

Masaki Maruyama

Kazuya Maki

Kazuya Morishita

Provided is a braking device for a vehicle comprising: a first hydraulic pressure generation unit which generates hydraulic pressure corresponding to the volume of a master chambers in the master chambers that change in volume according to the movement of master pistons; a second hydraulic pressure generation unit which is configured so as to be capable of generating a desired hydraulic pressure in a bottoming state in which the forward movement of the master pistons is restricted by a master cylinder; braking force generation units which apply the braking force corresponding to the input hydraulic pressure to wheels of a vehicle; and a braking force control unit which causes the second hydraulic pressure generation unit to generate hydraulic pressure in the bottoming state, and inputs the hydraulic pressure to the braking force generation units.

Braking device for vehicle

There is provided a brake control device for a brake device including a basic fluid pressure generating unit which generates a basic fluid pressure according to an operation to a brake operating member, a hydraulic pump which generates a fluid pressure to generate a differential pressure, a pressure regulating valve which regulates the differential pressure, and a friction brake mechanism which applies a fluid pressure obtained by adding the differential pressure to the basic fluid pressure, to a wheel cylinder. The control device includes a regulating unit which regulates the differential pressure according to an operating amount correlated value and which decreases the differential pressure according to an increase of the basic fluid pressure due to an increase of the operating amount correlated value when the vehicle is stopped and the differential pressure is regulated to a value larger than 0 by an operation to the brake operating member.

Brake control device for vehicle

A brake apparatus includes: a fluid pressure control valve; a fluid pressure pump; a feedback control circuit correcting a control power corresponding to a feedback control target rotation number of a motor and feed the corrected control power to a motor; a feed forward control circuit configured to feed, to the motor, a control power corresponding to a feed-forward control target rotation number of the motor; and an abnormal control fluid pressure generation control device, if a rotation number detector is abnormal, rotating the electric motor with the rotation number higher than the feedback control target rotation number by a margin rotation number, increases the brake fluid passing through the fluid pressure control valve, and changes the control current to be supplied to the fluid pressure control valve so that the wheel cylinder fluid pressure is not changed.

Brake apparatus for vehicle

In the brake control device, a wheel-cylinder hydraulic pressure (Pw) obtained by adding the linear-valve pressure difference to a master-cylinder hydraulic pressure (Pm) is applied to the wheel cylinder while the vehicle is running. When an operation of a brake pedal is started while the vehicle is running (t), the driving of the hydraulic pump is started. Thereafter, when the vehicle is stopped (t), the driving of the hydraulic pump is stopped. When the start of movement of the vehicle is detected during an operation of returning the brake pedal (t) and an operation of re-depressing the brake pedal is detected (t) in this state (specifically, while the vehicle is in a stopped state, the hydraulic pump is in a stopped state, and the brake pedal is being operated), the driving of the hydraulic pump is started (t).

A control apparatus controls acceleration of a vehicle provided with a motive power generation apparatus and brake apparatuses. For the control, the control apparatus comprises calculation and actuating blocks. The calculation block calculates torque to be requested, based on a difference between an actual value of the acceleration and a target value thereof and a gain for feedback controlling the actual value of the acceleration to the target value thereof. The gain is differentiated in value between in a first case in which the brake apparatuses are used for the feedback control and a second case in which the brake apparatuses are not used for the feedback control. The actuating block actuates the motive power generation apparatus and the brake apparatuses based on the calculated torque. The value of the gain in the first case is made larger than the value of the gain in the second case.

Method and apparatus for controlling acceleration of a vehicle

A running control apparatus calculates a target driving or braking torque in a calculating block to control the vehicle driven or braked by this torque at a target speed against a running resistance changed with running circumstances of the vehicle. In a control block, when a driver-required braking torque based on the braking operation of the driver is smaller than the target braking torque, the running control for the vehicle is performed to brake the vehicle by the target braking torque. When the driver-required braking torque becomes higher than the target braking torque, the running control is stopped, and the driver manually brakes the vehicle by the driver-required braking torque. When the driver-required braking torque is decreased to be lower than the target braking torque or a predetermined braking torque corresponding to the release of the braking operation, the running control is restarted.

Running control apparatus and running control program for the apparatus

A vehicle speed control device calculates a desired axle torque for maintaining a speed of a vehicle to a set speed, and conducts cruise control. Specifically, the vehicle speed control device calculates a drive force including a feedforward component corresponding to the set speed and a travel resistance against the travel of the vehicle, and a feedback component corresponding to a deviation of the set speed from the actual speed of the vehicle as a desired axle torque. The vehicle speed control device interrupts the cruise control when a requested drive axle torque requested by an accelerator operation during the cruise control exceeds the desired axle torque, and restarts the cruise control when the requested drive axle torque becomes lower than the desired axle torque.

Vehicle speed control device and method

A control apparatus controlling anteroposterior acceleration of a vehicle by controlling a motive power generation apparatus mounted on the vehicle, which is also provided with a staged transmission apparatus that operates on gear ratios. The motive power generation apparatus has an output shaft producing a rotation force in response to a command to be requested. The rotation force is transmitted to the drive wheels via the staged transmission apparatus. A feedback manipulated variable is calculated to control the production of the rotation force of the motive power generation apparatus so that an actual value of anteroposterior acceleration of the vehicle is controlled at a target value thereof. The calculated feedback manipulated variable is used as the command. When the staged transmission apparatus is in the switchover control of the gear ratios, the manipulated variable is is limited from being calculated (for example, stopped from being calculated).

Method and apparatus for controlling anteroposterior acceleration of a vehicle

A vehicle speed control system starts an automatic decelerating operation with a maximum permissible decelerating physical amount 'G', when an electronic control unit determines that a necessary decelerating physical amount for decreasing a vehicle speed 'v' to a target vehicle speed &#x201c;v&#x201d; at a curve starting point becomes larger than the maximum permissible decelerating physical amount &#x201c;G&#x201d;. The vehicle speed control system terminates the automatic decelerating operation, when required decelerating physical amount by a braking operation during the automatic decelerating operation becomes larger than an actual control decelerating physical amount for the automatic decelerating operation. The electronic control unit calculates the necessary decelerating physical amount &#x201c;G&#x201d; based on a distance &#x201c;d&#x201d; to the curve starting point and the vehicle speed &#x201c;v&#x201d;, in order to re-start an automatic decelerating operation with the decelerating physical amount &#x201c;G&#x201d;, when the required decelerating physical amount becomes lower than the decelerating physical amount &#x201c;G&#x201d;.

Vehicle speed control system

A vehicle automatic operation control device includes a target required torque calculating part () which determines the target required torque from the respective calculated values of a feed-forward calculated value and a feedback calculated value, and an automatic operation control part D which causes the vehicle to operate automatically on the basis of the determined target required torque, and which performs slip suppression control that suppresses slip of the wheels when any of the wheels of the vehicle slip. In cases where slip suppression control is performed by the automatic operation control part (D), the target required torque calculating part () holds the feedback calculated value based on the deviation between the target acceleration and actual acceleration, and determines the target required torque from the respective calculated values of the held feedback calculated value and feed-forward calculated value.

Vehicle automatic operation control device

A vehicle drive control device includes an initially determined request acceleration calculation means for calculating an initially determined request acceleration, an automatic drive control means for receiving the initially determined request acceleration and applying a predetermined torque to each wheel, a torque calculation means for calculating an allowable torque not causing a slip at each wheel when the allowable torque is applied thereto, on the basis of a vertical load applied to thereto and a friction coefficient of a road surface, a limit acceleration calculation means for calculating a limit acceleration acting on the vehicle in a case where the calculated allowable torque is applied to each wheel, and a request acceleration determination means for obtaining a request acceleration on the basis of the limit acceleration and the initially determined request acceleration, and for outputting the request acceleration, replacing the initially determined request acceleration, to the automatic drive control means.

Vehicle drive control device

An estimated gradient value of a road is calculated based on a vehicle acceleration 'A' and a time varying portion 'A'' of a wheel speed. In a case that an acceleration corresponding value &#x201c;Ggrad&#x201d; for the estimated gradient value is not regarded as indicating an exact figure, due to influences of disturbances, the acceleration corresponding value &#x201c;Ggrad&#x201d; is corrected by a limiting value for rate-of-change with regard to the road gradient depending on respective vehicle speed, and by a limiting value for the road gradient. As a result, the acceleration corresponding value &#x201c;Ggrad&#x201d; for the estimated gradient value can be more exactly obtained.

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Nisshin, Japan

Shintaro Osaki