Denso Corporation

Tomohiro Takizawa

Hideya Notani

Shinsuke Kawazu

Yoshinori Morita

Akira Sumi

An electronic control apparatus includes a first controller that is activated upon being fed with electric power through a first electric power feeding path, and a second controller that is fed with electric power through a second electric power feeding path. In the first electric power feeding path, there is provided a power supply switch that is turned on when a switch command is a connection command and turned off when the switch command is a cutoff command. The first controller transmits a state signal indicating whether it is in an activated state or a stopped state. The second controller diagnoses the power supply switch as being abnormal on condition that the state signal indicates the stopped state of the first controller when the switch command is the connection command or the state signal indicates the activated state of the first controller when the switch command is the cutoff command.

Electronic control apparatus

An engine control apparatus predicts the speed of an engine in a normal rotation range as a function of a loss energy in an engine rotation pulsating period and also predicts the speed of the engine in a reverse rotation range as a function of a pumping loss component and a loss energy which is derived by reversing the sign of a value of a friction component that is a portion of the loss energy in the normal rotation range and arises from mechanical friction to which the piston is subjected during stroke thereof. The pumping loss component is an energy loss occurring in the intake stroke of the engine. This calculation enhances the accuracy in predicting a future engine speed between start of a drop in speed of the engine resulting from stop of combustion of fuel and stop of rotation of the engine.

Engine control apparatus to predict engine speed accurately

A control system for vehicles equipped with an engine and an automatic transmission mechanism which has a non-running position and a running position one of which is selected by a driver of the vehicle and works to automatically change a speed of an output thereof. The control system basically inhibits the engine from being automatically stopped on an uphill road in order to minimize the rolling back of the vehicle upon start of the vehicle, but is responsive to the driver's intention to permit the engine to be automatically stopped, that is, the switching from the running position to the non-running position to stop the engine.

Growing community of inventors

Kariya, Japan

Tomohiro Takizawa