Toyota Jidosha Kabushiki Kaisha

Akira Takeichi

Ayumu Sagawa

Hideaki Otsubo

Shogo Tsuge

Junya Mizuno

Hiroyasu Kitagawa

Takashi Okubo

A vehicle control system configured to promptly shift a gear stage of a transmission during startup of an engine while reducing shocks. An engine is started by a first motor when shifting from an electric vehicle mode to a parallel hybrid vehicle mode. A controller is configured to establish a target stage via an interim stage if a shifting operation of a transmission to directly establish the target stage is expected to take longer time than a shifting operation of the transmission to establish the target stage via other stage.

Vehicle control system

A vehicle control system to improve acceleration response and shift feel by executing a power-on downshifting in a suitable manner. An evaluation of a skip shifting and an evaluation of a stepwise shifting are compared to each other when executing the downshifting, based on an evaluation index calculated in advance in accordance with an operating condition of an accelerator. The downshifting operation to be executed is selected from the stepwise shifting and the skip shifting whose evaluation is higher than the other one.

Control system for vehicle

A vehicle control system to accurately control a vehicle by estimating a position of an accelerator pedal. In a first phase of an operation of the accelerator pedal in which a depression of the accelerator pedal increases, a first predicted value of a position of the accelerator pedal is calculated by a first calculation procedure based on the position of the accelerator in the first phase. In a second phase in which the change amount of the position of the accelerator plateaus, a second predicted value of the position of the accelerator pedal is calculated by a second calculation procedure based on the position of the accelerator in the second phase. In a third phase in which the change amount of the position of the accelerator decreases, the second predicted value is employed as the predicted value of the position of the accelerator pedal.

A speed change control system configured to allow a driver to promptly sense a response to an accelerating operation. A reference index value that the driver senses an acceleration response is calculated based on acceleration of a vehicle. If the reference index value is smaller than a first reference index value at which the driver is allowed to sense the acceleration response, a downshift point is lowered to a first drive force.

Speed change control system for automatic transmission

A shift control system for vehicle includes a transmission that performs an upshift based on an accelerator opening, comprising: a detector that detects a longitudinal acceleration the vehicle, a calculator that calculates a change amount per unit time of the accelerator opening, and a controller that controls the transmission. The controller repeatedly executes upshift to reduce a speed ratio of the transmission based on a second condition that determines a shift timing of the upshift, upon satisfaction of a first condition. The first condition is satisfied if the acceleration increasing the vehicle speed is greater than or equal to a predetermined first threshold value, the change amount is in a stable state falling within a certain range, and a time period that the change amount keeps falling within the certain range has exceeded a second threshold value.

Growing community of inventors

Susono, Japan

Akira Takeichi