Honda Giken Kogyo Kabushiki Kaisha

Honda Motor Co., Ltd.

Ikuo Nonaga

Masaru Abe

Takashi Kohata

Masataka Izawa

Yosuke Horiuchi

Osamu Tsurumiya

Yoshimichi Kawamoto

Naoki Tsuchiya

Taichi Kitamura

Fumitaka Abe

Yurina Morimoto

Kazuya Moriyama

Ryo Takada

Katsuhito Kambe

Shun Saigusa

Toshihiko Fukuda

Hisanori Yanagida

Shinji Suto

Yasushi Aoki

Ichiro Ueno

Akihiko Koike

Eisuke Horii

Yukihisa Ishii

Takashi Kuboshima

Yuki Hotani

Yutaka Kichima

Takeshi Ohba

Keishiro Kikuchi

Katsuyuki Takei

Makoto Taniguchi

Katsuya Matsuzaki

Hideharu Murano

Iwao Nakamura

Katsuhito Kanbe

Hiroyuki Hase

Hiroshi Koan

A vehicle control device and method includes: a gear shift member having a parking brake, a drive gear, and a park gear; a hydraulic brake decelerating the vehicle; a vehicle speed detection member; a control switch, which, when pressed, simultaneously activating the parking brake and the park gear; a control member. When the control member determines the vehicle speed exceeds a first threshold during an operation of the control switch, the vehicle remains in a drive gear state, and the hydraulic brake is activated to decelerate the vehicle; when the control member determines the vehicle speed is lower than the first threshold, the vehicle stays in the drive gear state, and the parking brake is activated. When the vehicle speed changes from the first to a second threshold, the hydraulic brake stops operating, the gear shift member shifts to the park gear, and the parking brake is maintained.

Vehicle control device and method

The disclosure provides a vehicle control device and method for controlling a vehicle. The vehicle control device includes a gear shift member, having a parking brake keeping a vehicle in a stationary state, a drive gear keeping driving the vehicle, and a park gear keeping the vehicle in a parked state; a control switch configured to be able to control the parking brake and shift to the park gear; a control member performing following controls when the vehicle is in the parked state: when the control switch is operated for a period of time shorter than a prescribed time, the control member shifts to the park gear and executes linked parking that links an operation of the parking brake, and during the execution of the linked parking, when the control switch is operated for a period of time longer than the prescribed time, the control member releases the parking brake.

A vehicle control system includes a boost device, a braking unit, a cell motor, and a start operating unit. The boost device boosts a braking force applied by a foot brake to a vehicle with an output voltage from a battery. The braking unit, which is different than the foot brake, brakes the vehicle appropriately and keeps the braking force even in a case that the output voltage is not supplied from the battery, or which braking unit does not require the output voltage from the battery. The cell motor is driven by an output voltage from the battery and starts the engine. The start operation unit starts the cell motor, wherein the vehicle control system has a function not to start the cell motor when the start operation unit is operated, unless the braking unit is in operation.

Vehicle control system

A brake system for a vehicle includes an electrically operated parking brake drive device which generates an operating force for operating the wheel brakes or dedicated parking brakes in response to energization, and which operates even upon cancellation of the energization while in the operated state. A braking force related amount detector detects a physical quantity related to a braking force exhibited by each of the hydraulic pressure operated wheel brakes. When a detected physical quantity exceeds a reference value in a stopped state of the vehicle, a controller energizes the electrically operated parking brake drive device. Thus, the frequency of operation of the electrically operated parking brake drive device is decreased while eliminating inconvenient operations required to operate the electrically operated parking brake drive device, thereby reducing noise and improving durability.

Brake system for vehicle

In an electric vehicle capable of regenerative braking of wheels, a differential pressure regulating valve is interposed between a master cylinder for generating a hydraulic braking pressure by operation of a brake operating element and a brake cylinder for a driven wheel. In a first region in which an input hydraulic pressure into the differential pressure regulating valve is equal to or less than a predetermined value, an output hydraulic pressure from the differential pressure regulating valve is maintained at zero, and in a second region in which the input hydraulic pressure exceeds the predetermined value, the output hydraulic pressure is lower than the input hydraulic pressure by the predetermined value. Further, in the first region, a regenerative braking force is determined in proportion to a quantity of operation of the brake operating element, and in the second region, the regenerative braking force is maintained at a constant value irrespective of the quantity of operation of the brake operating element. Thus, the regenerative braking force is preferentially generated at the start of braking, and after the regenerative braking force reaches a limit, a deficiency of braking force can be made up by the hydraulic braking force. Moreover, a sum total of the hydraulic braking force and the regenerative braking force can be proportioned to the quantity of operation of the brake operating element.

Braking system for electric vehicle

A four wheel steering system for a motor vehicle with steerable front and rear road wheels, a steering angle sensor for detecting a front wheel steering angle through which the front road wheels are steered, a vehicle speed sensor for detecting a vehicle speed of the motor vehicle, a rear wheel steering mechanism for steering the rear wheels, and a controller for controlling the rear wheel steering mechanism to steer the rear road wheels based on the detected front wheel steering angle and the detected vehicle speed when the front road wheels are steering. The controller controls the rear wheel steering mechanism to steer the rear road wheels in a direction which is opposite to the front road wheels if the detected vehicle speed is relatively low, and also controls the rear wheel steering mechanism to steer the rear road wheels in a direction which is the same as the front road wheels if the detected vehicle speed is relatively high. Furthermore, the controller controls the rear wheel steering mechanism to increase a rear wheel steering angle which through the rear road wheels are steered as the front wheel steering angle increases if a change in the front wheel steering angle is relatively small, and controls the rear wheel steering mechanism to reduce an increase in the rear wheel steering angle if a change in the front wheel steering angle is relatively large.

Four wheel steering system

An electric power steering system which additionally includes a radial arm extending from a steering rod, an axial shaft extending in parallel with the axial center line of the steering rod, an axial bore formed in the casing of the system for guiding axial movement of the axial shaft substantially without any play, and a spring member urging the axial shaft against a side wall of the axial bore. Thus, rotation of the steering rod around its axial center line may be prevented with a relatively small force. Therefore, no excessive force needs to be applied to the axial shaft, and the axial shaft would not encounter any substantial resistance to its axial movement. The axial shaft may be provided with a groove extending along one side thereof in parallel with the axial central line of the axial shaft and provided with a bottom surface which slopes along its lengthwise direction, and the casing may support a steering rod displacement sensor having a spring-loaded retractable plunger serving as a measuring end and abutting the sloping bottom surface of the groove. Thus, the steering rod displacement sensor may be provided with a simple structure which makes it suitable to be mounted in a very limited space in the power steering system. If desired, the steering rod displacement sensor may also serve as the spring member for removing play between the axial shaft and its axial bore. This electric power steering system is suitable for use in front and rear wheel steering vehicles.

Electric power steering system

A four-wheel steering system for a motor vehicle steers motor vehicle rear wheels based on a steering angle ratio between front and rear wheels based on a vehicle speed, and a front wheel steering angle. The steering angle ratio is of a negative value or a relatively small positive value when the vehicle speed is in a medium speed range or a high speed range and the front wheel steering angle is in a relatively small range. The motor vehicle is controlled to turn well when the front wheel steering angle is in the relative small range while the motor vehicle is running in the medium and high speed ranges.

Four-wheel steering system for motor vehicle

The steering operation of a motor vehicle with steerable front and rear road wheels is controlled by steering the rear road wheels with an actuator such as an electric motor which produces a steering force dependent on a deviation of the actual rear wheel steering angle from a target rear wheel steering angle. The rear road wheels are thus controlled with a characteristic dependent on the coefficient of friction of a road on which the motor vehicle travels and the steering speed at which the motor vehicle is steered. Typically, a steering control method comprises the steps of detecting the steering angle of the front road wheels, determining a target steering angle for the rear wheels based on the steering angle of the front road wheels, detecting the actual steering angle of the rear road wheels, calculating a steering angle deviation of the actual rear wheel steering angle from the target steering angle, determining a rear wheel steering force based on the steering angle deviation, and steering the rear road wheels to the target steering angle with the determined rear wheel steering force.

Method of and apparatus for controlling steering operation of a motor

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Wako, Japan

Ikuo Nonaga