Honda Giken Kogyo Kabushiki Kaisha

Atsuo Ohno

Nobuyoshi Asanuma

Yasushi Aoki

Takeshi Ohba

Kouichi Suyama

Hideki Toyota

Yoshikazu Imura

Yoshikazu Takahira

A portable display device is capable of monitoring the residual capacity of a traveling battery from the outside of an electric vehicle, and conducting operations such as locking and unlocking of a door from outside of the vehicle and controlling the operation of the air conditioner through wireless means. This portable display device is inserted into an insertion section provided in an instrument panel of the vehicle for operating the vehicle. If an ID code in the portable display device agrees with an ID code in the vehicle, a traveling switch is unlocked. Then, if the traveling switch is operated, a steering lock device is released and the traveling motor is connected to the traveling battery in a state in which the electric vehicle is operable.

Battery residual capacity display and operating device for an electric

In a brake system in an electric vehicle comprising a follower wheel capable of being hydraulically braked by the operation of a brake operating element, and a driving wheel connected to and driven by a motor using a battery as an energy source and capable of being hydraulically braked and regeneratively braked by the operation of the brake operating element, the regenerative braking force for the driving wheel exceeds a theoretic distribution characteristic of the braking forces for the follower and driving wheels at least during an initial braking. Thus, it is possible to sufficiently perform the recovery of the kinetic energy of the vehicle by the regenerative braking to increase the possible travel distance of the vehicle. In addition, at least during an initial braking, the hydraulic braking of the driving wheel and the hydraulic braking of the follower wheel are inhibited, and substantially only the regenerative braking of the driving wheel is performed. Thus, it is possible to recover the kinetic energy of the vehicle without consumption thereof by the hydraulic braking to increase the possible travel distance of the vehicle.

Brake system in electric vehicle

A method of and an apparatus for controlling brakes suitable for use in an electric vehicle. Target deceleration is determined from the amount of depression of a brake pedal and the deceleration of the electric vehicle is detected. Then, the difference between the target deceleration and the deceleration of the electric vehicle is determined and a desired braking force for attaining the target deceleration is obtained. Thereafter, it is determined whether or not the difference falls within a predetermined range. It is further judged, based on the result of the determination, whether the operation of a regenerative brake is required to obtain the desired braking force. If the difference falls outside of the predetermined range, then the regenerative brake is inhibited from being actuated.

Electric vehicle regenerative and friction braking control system

The switchover is mode from a regenerative braking-preference mode in which the braking force for follower and driving wheels are more than a theoretical braking force distribution characteristic for follower and driving wheels, to a usual mode in which a braking force distribution characteristic thereof corresponds to the theoretical braking force distribution characteristic, is carried along an equal braking force line which is the sum of the braking forces for the follower and driving wheels. Thus, the sum total of the braking forces over the entire vehicle is kept constant even if the distribution of the braking forces for the follower and driving wheels is varied and therefore, a smooth braking is possible without a degradation of the steering stability. In addition, the switchover in mode from the regenerative-preference mode to the usual mode is carried out when the time-differentiation value of a wheel speed of the follower wheel or the driving wheel exceeds a predetermined value. Thus, when the friction coefficient of a road surface is large so that a small locking tendency of a wheel may be produced during braking, the regenerative braking-preference mode can be selected, thereby increasing the effect of recovery of energy by the regenerative braking.

A transmission control system in an electric vehicle in which a battery is used as en energy source for a motor and is charged with an electric power generated through the motor by regenerative braking of driving wheels which are connected to the motor through a transmission. In the transmission control system, a regenerative energy capable of being generated at a current transmission ratio, a regenerative energy capable of being generated when such transmission ratio is increased, and a regenerative energy capable of being generated when such transmission ratio is decreased, are calculated and compared with one another, thereby shift-changing the transmission into a shift position which permits the largest regenerative energy to be provided. This ensures that the efficiency of recovery of the energy can be increased to the maximum to effectively charge the battery.

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Saitama, Japan

Atsuo Ohno