Nissan Motor Company Limited

Chiaki Harada

Satoshi Sakakibara

Akihiro Ueki

Hiromasa Sakai

Kazuhiro Takatori

Takashi Nakazawa

Takashi Shibayama

Toru Urasawa

Ryozo Hiraku

Yutaka Fujisawa

Masaki Shimakura

Asuka Soutome

Makoto Shouji

A hybrid vehicle includes a first motor generator ( ) and an engine ( ) connected to first drive wheels ( ) via a transmission ( ), a second motor generator connected to a second drive wheel ( ), a battery ( ) electrically connected to the first and second motor generators ( ), a sensor ( ) which detects a running state of the vehicle, a sensor which detects a charge state of the battery ( ), and a controller ( ). The controller ( ) controls a drive force of the engine ( ) and the first motor generator ( ) according to the running state of the vehicle and the charge state of the battery ( ), and drives the second motor generator ( ) by the battery ( ) or the power generated by the first motor generator ( ).

Four-wheel drive hybrid vehicle

A hybrid vehicle is driven by an engine and/or motor by tightening and releasing a clutch interposed between the engine and a transmission. A selector lever position is detected, and a clutch current is interrupted when the selector lever is not in a range for forward motion. In this way, the clutch current is forcibly interrupted when the vehicle is not moving forward, so tightening of the clutch is definitively prevented even if a clutch current control CPU operates incorrectly.

Hybrid Vehicle

A lockup control system controls a lockup state of the automatic transmission employing a torque converter with a lockup clutch. The lockup control system executes a lockup clutch engagement pressure control for decreasing an engagement differential pressure of the lockup clutch at a predetermined differential pressure for a predetermined time period under a coast lockup state. Further, the lockup control system executes a learning control for obtaining the predetermined differential pressure by adding a differential pressure correction value to a differential pressure learning value by which the torque converter generates a slight slip under the coast lockup state. Therefore, even during the coast lockup state, both of suppressing vibrations by a lowering of a lockup capacity and maintaining a responsibility for re-increasing the differential pressure are ensured.

Lockup control system for automatic transmission

A speed ratio control operation of an automatic transmission for a vehicle is controlled by using an oil pressure supplied from a oil pump (16). At least a circuit (22) which sets a rotation speed of the oil pump (16) to a first pump rotation speed in order to maintain a necessary minimum line pressure to control a variable mechanism, a stationary vehicle condition determination circuit (24) which determines that the vehicle is operating under the conditions that the brake is operated and vehicle speed is below a fixed value, and a circuit (23) which sets a second pump rotation speed which is lower than the first pump rotation speed when stationary vehicle conditions are met are provided. The rotation speed is lowered to the second pump rotation speed when the vehicle stationary conditions are met which results in reduced energy consumption and reduced noise pollution.

Oil pump control device for automatic transmission

A line pressure control apparatus of an automatic transmission controls the line pressure of the automatic transmission under a lockup condition to ensure an engagement capacity and an amount of lubrication oil for an engaged friction element under a high vehicle speed condition. The line pressure control apparatus comprises a line pressure lowering section, a vehicle speed deciding section and a pressure changing section. The pressure lowering section lowers a line pressure under a lockup condition of the automatic transmission. The vehicle speed deciding section decides whether a vehicle speed of the automotive vehicle is higher than a predetermined value. The pressure changing section changes the line pressure under the lockup condition from the lowered line pressure to a line pressure under a normal condition when the vehicle speed is higher than the predetermined value.

Growing community of inventors

Zama, Japan

Chiaki Harada