Toyota Jidosha Kabushiki Kaisha

Seiji Hino

Katsuhiko Yamaguchi

Yukio Kobayashi

Osamu Harada

Naoya Okubo

Masakiyo Kojima

Akihiro Yamanaka

Shinya Ohori

A controller for vehicle is provided. A determining section obtains fuel pressure in a delivery pipe and performs a rationality check for determining whether the obtained fuel pressure is within a normal range. The determining section shifts the normal range toward a high pressure side when a second index value of a vehicle outside temperature is higher than a first index value as compared with when the second index value is not higher than the first index value. The second index value is obtained when the determining section is activated. The first index value is stored in a nonvolatile memory before a main switch is turned off so that power supply is stopped.

Controller and control method for vehicle, and memory medium

A diagnostic method for a multicylinder internal combustion engine is provided. The method comprises determining that malfunction pertaining to the air-fuel ratio has occurred when degree of the rotational fluctuation is equal to or more than a first determination value; determining that malfunction pertaining to the air-fuel ratio has not occurred when the degree of the rotational fluctuation is equal to or less than a second determination value that is smaller than the first determination value; and changing mode of engine control when the degree of the rotational fluctuation is smaller than the first determination value and greater than the second determination value. After the changing, the determining that malfunction pertaining to the air-fuel ratio has occurred is repeated.

Diagnostic method and diagnostic system for multicylinder internal combustion engine

When a first motor MG cranks and starts an engine that is in the cold, the revolving speed of the engine does not increase quickly . It is accordingly required to control the first motor MG , in order to prevent electric power stored in a battery from being wasted. A starting control apparatus does not cause the first motor MG to output a torque corresponding to a difference between a target revolving speed N* and an actual revolving speed Ne of the engine , but gradually increases a target torque STG by the open-loop control and restricts the magnitude of the target torque STG to a preset maximum torque STGMAX, which depends upon a cooling water temperature Tw of the engine . When the engine is in the cold, the high viscosity of lubricant causes the revolving speed of the engine not to quickly increase in response to the high target torque set to the first motor MG . In this case, the maximum of the target torque is restricted to a smaller value, so as to prevent the electric power stored in the battery from being wasted. The injection allowable revolving speed, at which the fuel injection to the engine is allowed to start, is also set equal to a small value. This causes the engine to start self driving at an earlier timing, thereby saving the electric power consumed by the first motor MG

Starting control apparatus for internal combustion engine

An internal combustion engine control unit for hybrid vehicle makes an electric motor function as a main driving source for the vehicle under a predetermined condition and at the same time, controls a hybrid mechanism so as to warm up the internal combustion engine. If a requested engine output to the internal combustion engine exceeds a predetermined output or if an accelerator opening degree exceeds a predetermined opening degree, the same control unit changes the operating condition of the internal combustion engine from the warm-up operation condition to an operation condition fitting to the requested engine output.

Internal combustion engine control unit for, and method of controlling a hybrid vehicle

When a first motor MG,cranks and starts an engine,that is in the cold, the revolving speed of the engine does not increase quickly,It is accordingly required to control the first motor MG,in order to prevent electric power,stored in a battery from being wasted. A starting control apparatus does not cause the first motor MG,to output a torque corresponding to a difference between a target revolving speed N* and an actual revolving speed Ne of the engine,but gradually increases a target torque STG by the open-loop control and restricts the magnitude of the target torque STG to a preset maximum torque STGMAX, which depends upon a cooling water temperature Tw of the engine,When the engine,is cold, the high viscosity of lubricant causes the revolving speed of the engine,not to quickly increase in response to the high target torque set to the first motor MG,In this case, the maximum of the target torque is restricted to a smaller value, so as to prevent the electric power stored in the battery,from being wasted. The injection allowable revolving speed, at which the fuel injection to the engine,is allowed to start, is also set equal to a small value. This causes the engine,to start self driving at an earlier timing, thereby saving the electric power consumed by the first motor MG

Growing community of inventors

Nissin, Japan

Seiji Hino