Nissan Motor Company Limited

Jatco Corporation

Takashi Matsuda

Masato Koga

Seiichiro Takahashi

Hideshi Wakayama

Yuzuru Tohta

Keichi Tatewaki

Daisuke Matsumoto

Hironori Nihei

Shouta Hamane

Tomoyuki Suzuki

Kouichi Mori

Hiroshi Sekiya

Kousuke Waku

Masayuki Miyazono

Motoyuki Hattori

Atsufumi Kobayashi

Koutarou Tagami

A road surface slope estimating device includes a forward/backward sensor that outputs a detected forward/backward of a vehicle, a forward/backward estimator that calculates an estimated forward/backward of the vehicle, and a road surface slope estimating device that calculates an estimated road surface slope value using the detected forward/backward and the estimated forward/backward. The road surface slope estimating device implements a momentarily rough terrain determination step to determine whether the vehicle is traveling on momentarily rough terrain or continuously rough terrain. When it is determined that the vehicle is traveling on momentarily rough terrain, the road surface slope estimating device fixes the estimated road surface slope value to an estimated road surface slope value obtained immediately before the determination is made.

Road surface slope estimating device and engine control apparatus

While a vehicle speed is between a first certain vehicle speed and a second certain vehicle speed lower than the first certain vehicle speed, it is determined whether to perform vehicle control in accordance with conditions excluding a condition based on the estimated road surface slope.

Vehicle control apparatus for controlling the drive force of the vehicle

A road surface slope estimating device changes filter characteristics of a filter with respect to a detected vehicle body attitude value in accordance with an actual rate of change of road surface slope so as to enhance the filter characteristics when the rate of change of the road surface slope is low and to degrade the filter characteristics when the rate of change of the road surface slope is high.

Road surface slope estimating device

A transmission controller operates an electrical oil pump in a steady mode, in which an operating load of the electrical oil pump is set at a steady load, during an idle stop, but operates the electrical oil pump in a high-pressure mode, in which the operating load of the electrical oil pump is higher than the steady load, for a predetermined period when an engine stops rotating.

Automatic transmission and hydraulic control method therefor

A control device controls a transmission mechanism which includes a first clutch to be engaged at startup and a second clutch, and is interlocked when hydraulic pressure is supplied to the first and second clutches and when the first and second clutches are completely engaged. The control device includes a hydraulic pressure control unit controlling hydraulic pressure supplied to the transmission mechanism so that the first clutch is set in a completely engaged state and the second clutch is set in a slip interlock state where the second clutch is not completely engaged in the case of a return from an idle stop control in which an engine is automatically stopped. The hydraulic pressure control unit starts reducing hydraulic pressure supplied to the second clutch when an increased amount of an engine rotation speed per unit time becomes smaller than a predetermined value.

Control device and method for stepped transmission ensuring smooth transition in engine idle stop and resumption cycle

When the temperature of oil supplied to an electrical oil pump is detected and the oil temperature is lower or higher than normal oil temperature, a gradient threshold value smaller than that at normal oil temperature is set, a gradient of a road surface on which a vehicle is stopped is detected, and an idle stop is prohibited when the detected gradient of the road surface is larger than the set gradient threshold value.

Automatic transmission and control method therefor

An engine is restarted in response to an idle stop OFF command at tso that a gear shift control purpose hydraulic pressure is raised according to a working oil from an engine driven oil pump. An idle stop release time control of the engine is allowed according to a torque down unnecessary determination when a gear shift control purpose hydraulic pressure has reached to a set hydraulic pressure at t. In a case where this allowance causes an engine torque Te to be raised from a torque down value toward a driving operation corresponding value by a predetermined gradient &#x394;Te, a command value of a starting frictional element engagement pressure Pis set to a control maximum value during the idle stop control including during the idle stop release time control.

Fastening pressure control device for starting friction element at time of controlling idle stop of vehicle

At vehicle stop judgment time t, a first engine automatic-stop control permission judgment, based on idle stop permission conditions by which an instant permission judgment can be possible, is carried out. If a result of the first engine automatic-stop control permission judgment at time tis 'permitted', the second engine automatic-stop control permission judgment, based on an idle stop permission condition which requires a certain time for the judgment, is initiated, and an electric oil pump ON (drive) command (the test drive command) is issued. At time tat which an actual drive of the electric oil pump in response to the test drive command is detected, it is judged that a failure of an electric system of the electric oil pump and a foreign matter-biting failure of the electric oil pump do not occur, then a failure judgment of the electric oil pump becomes 'normal'. This judgment is completed before time tat which the second engine automatic-stop control permission judgment ends, and both of &#x201c;permitted&#x201d; of a result of the second engine automatic-stop control permission judgment and &#x201c;normal&#x201d; of the failure judgment of the electric oil pump, an idle stop ON command is not outputted.

Trouble-deciding device for electric oil pump to be used in transmission of vehicle having engine automatic-stop control device

An acceleration detection device for detecting detected acceleration of a vehicle is provided with a stopped acceleration detector, an acceleration change detector, an acceleration estimating unit and a correcting unit. The stopped acceleration detector detects a detected stationary acceleration value when the vehicle is stopped on a sloping road based on an acceleration sensor signal from an acceleration sensor mounted on the vehicle. The acceleration change detector detects an acceleration change associated with the vehicle transitioning from a stationary state to a driving state on the sloping road based on the acceleration sensor signal. The acceleration estimating unit estimates an estimated stationary acceleration value based on the acceleration change that was detected by the acceleration change detector. The correcting unit corrects the detected stationary acceleration value based on a deviation between the estimated stationary acceleration value and the detected stationary acceleration value.

Acceleration detection device, acceleration detection method, and neutral control device employing same

In an idling-stop cancellation control apparatus of a vehicle driving system of an idling-stop control device equipped automotive vehicle capable of running by a power produced by an engine and transmitted via a transmission whose shift is controlled by a hydraulic pressure produced by an engine-driven oil pump during operation of the engine, a controller is configured to execute, based on engine speed, idling-stop cancellation control by which the vehicle driving system is put into an output torque state suited for vehicle-driving operation, when a hydraulic pressure sensor system provided for detecting a hydraulic pressure used for shift control of the transmission is failed. The controller is further configured to execute, based on the hydraulic pressure, idling-stop cancellation control by which the vehicle driving system is put into an output torque state suited for vehicle-driving operation, when the hydraulic pressure sensor system is unfailed.

Growing community of inventors

Isehara, Japan

Takashi Matsuda