Aisin Seiki Kabushiki Kaisha

Jtekt Corporation

Toyoda Koki Kabushiki Kaisha

Nissan Motor Company Limited

Advics Co., Ltd.

Aisin Seiki Kabushiki Kaisha & Kanto Jidosha Kogyo Kabushiki Kaisha

Takayuki Ohta

Hiroaki Kato

Minekazu Momiyama

Rikuo Hatano

Yuichi Murakami

Koji Aoki

Toshimitsu Oka

Takaya Aiyama

Yoshiyuki Yasui

Naoaki Hoshihara

Eiichi Ono

Kiyokazu Ieda

Yuzo Imoto

Yuji Muragishi

Koichi Hirota

Hiroaki Aizawa

Tsuyoshi Murakami

Shinji Takeuchi

Norikazu Kobayashi

Akira Kodama

Shinya Aono

Tetsuya Nozawa

Yuuichi Fukuyama

Tomohiko Usui

Hidetoshi Kadoya

Takashi Sekiguchi

Akira Yamakoshi

Tsutomu Matsubayashi

An electric power steering apparatus includes a motor for applying assist torque to a vehicle steering mechanism and a controller, which controls driving of the motor to cause the assist torque to follow an assist command value. The controller calculates a basic assist command value based on steering torque applied to the steering mechanism and corrects the basic assist command value using a correction value, thereby setting the assist command value. If the steering torque has an absolute value greater than a threshold value when the vehicle is in a straight-line traveling state, the controller sets the correction value such that the absolute value of the steering torque is reduced. If the steering torque has an absolute value less than the threshold value when the vehicle is in a straight-line traveling state, the controller sets the correction value such that the absolute value of the assist command value is reduced.

Electric power steering apparatus

A controller controls, based upon a manual operation signal from a first operating means and the automatic operation signal from a second operating means, a driving of a driving power source for generating a driving force for an opening/closing operation of a vehicle door. The controller switches control for driving the driving power source. An automatic operation mode is selected when the automatic operation signal is inputted to the controller, in which the driving power source is driven to output a predetermined first driving output value. A manual operation mode is selected when the manual operation signal is inputted to the controller in which the driving power source is driven to output a second driving output value which is higher than the first driving output value.

Vehicle door opening and closing apparatus

The control system of a vehicle controls the transmission ratio of the steering angle of a steering wheel relative to a turning angle of front wheels based on a drive force distribution ratio. Thus, the performance of the tires on the front wheels can be used to almost maximum potential, providing effective prevention of understeering.

Vehicle control system

This invention provides a vehicle motion control method and a vehicle motion control apparatus capable of improving the behavior stability of a vehicle. According to the vehicle motion control method, vehicle steering characteristic is determined based on a behavior amount differentiated value obtained by differentiating (S) a slip angle differential value which is a behavior amount of the vehicle which occurs around a z-axis in the vertical direction with respect to the vehicle body (S, S). Consequently, because the phase of the slip angle differential value is progressed, the transition tendency of the steering characteristic, that is, which the vehicle motion condition is moved to over-steer or under-steer, can be obtained early. Therefore, the starting timing of the steering control or drive power control of the vehicle can be accelerated thereby improving the behavior stability of the vehicle.

Vehicle motion control method and vehicle motion control apparatus

An electronic control unit calculates a target yaw rate in accordance with a vehicle speed and a steering angle and calculates the yaw rate difference on the basis of the target yaw rate and an actual yaw rate. The electronic control unit estimates the grip factor of a front wheel to road surface and sets a distribution ratio for distribution of a vehicle-control target value among actuators of a steering system, a brake system, and a drive system in accordance with the estimated grip factor. The electronic control unit controls the actuators of the three systems in accordance with control instruction values distributed on the basis of the vehicle-control target value and the distribution ratio.

Integrated control apparatus for vehicle

When a variable value indicates that a steering characteristic is understeer, a control unit controls a variable transmission ratio device to change a second steering angle such that the greater the understeer indicated by the variable value, the smaller the steering angle of steered wheels relative to the turning angle of a steering wheel becomes. When the differentiated value of the variable value indicates that the understeer is changing to increase, a correction unit corrects the variable value such that the greater the degree of change of the understeer indicated by the differentiated value, the greater the understeer indicated by the variable value becomes. Hence, the attitude of a vehicle in understeer is stabilized with a simple configuration.

Vehicle steering apparatus and control method therefor

A door lock apparatus for a vehicle includes an outside switch provided outside of a vehicle for detecting an opening operation of a door from the outside of the vehicle, an actuator for releasing an engagement of a latch mechanism of the door, a control device electrically connected to the outside switch for driving the actuator in response to the opening operation of the door being detected by the outside switch, and a detecting device for detecting an impact added to the vehicle. When the detecting device detects the impact added to the vehicle, the control device disables the opening operation of the door being detected by the outside switch within a first predetermined time from the detection of the impact.

Door lock apparatus for vehicle

A first ECUdetects a steering torque applied to a steering system, estimates a self-aligning torque generated in a front wheel on the basis of the steering torque, and estimates a side force for the front wheel on the basis of lateral acceleration and a yaw rate. The first ECUestimates a grip factor &#x3b5; for the front wheel on the basis of a change of the self-aligning torque to the side force. The first ECUjudges whether the grip factor is below a second OS (oversteer) start threshold value. A second ECUcontrols the transfer ratio according to the vehicle state when the grip factor is less than the second OS start threshold value.

Vehicular steering device

An Amplitude Shift Keying (ASK) modulating circuit includes an oscillation circuit generating a pulse oscillation having a given frequency. A frequency divider is provided having a binary counter unit and having at least an input terminal, an output terminal and a reset terminal. The frequency divider is active and inactive when the reset terminal thereof is applied with low and high levels of a transmission signal wave, respectively, and divides the pulse oscillation while the frequency divider is active. The transmission signal wave is modulated together with a carrier frequency which is identical to the divided frequency.

ASK modulation circuit

A door approach transmission apparatus comprises an outside door handle,having a conductor with a slit,disposed in the door handle surface. A slot antenna,is disposed at the slit,, and includes feeding points,installed on the conductor. The apparatus also includes a transmitter,for applying voltage for radio wave oscillation to the feeding points,. The above-described door approach transmission and reception apparatus can be used in a door lock control apparatus where a search radio wave is emitted from a vehicle, a portable wireless device,receives the search radio wave, and returns an ID signal. An electrically driven door lock apparatus,is driven to unlock the door when the returned ID signal coincides with a registered ID signal. The search radio wave is irradiated from the slot antenna. Either of a transmitter,and a receiver,is selectively connected to the feeding points,. By virtue of the above-described features, the emission and reception of radio waves is realized, and in the case of a door handle made of a metal, the number of parts for emission and reception of the radio waves are reduced.

Door approach communication apparatus and door lock control apparatus

A vehicle door lock control apparatus includes a remote control unit that provides instructions to effect a lock condition or an unlock condition of a door look mechanism, a door handle switch which detects the operating condition of a door handle, a door lock control unit that effects the lock condition or the unlock condition of the door lock mechanism in response to signals produced by the door handle switch or the remote control unit, and a contact electrode connected to the door lock control unit for detecting operation of the door handle through contact by a user. The remote control unit has an electrode that establishes a capacitance combination between the remote control unit and the door lock control unit.

Door lock control apparatus for a vehicle

A pin secured at one end of a link is inserted into an L-shaped groove of a ock lever pivoted to the upper surface of an upper guide rail and the other end of the link is connected to an actuator by way of a wire. The hook of the lock lever can be inserted into the hook hole of the flange of the lower guide rail. Rotating of the lock lever and thus rotation of the upper guide rail relative to the lower guide rail by an accidental external force to the lock lever can be prevented in the rotatable seat.

Growing community of inventors

Okazaki, Japan

Takayuki Ohta