Denso Corporation

Ryohei Sano

Takahiro Kondo

Ko Tanaka

A booster pump increases fuel pressure in a high-pressure system of a fuel supply system. A decompression mechanism reduces the fuel pressure. In case of a discharge abnormality of the booster pump which causes rise in the fuel pressure, the fuel pressure control system performs an abnormality handling to cause the decompression mechanism to stop the rise in the fuel pressure. In case of the discharge abnormality, and on determination of a warning-required state, in which the fuel pressure in the high-pressure system possibly exceeds a threshold pressure, a control device causes a warning state, in which the fuel pressure does not exceed the threshold pressure before the rise in the fuel pressure stops, even if the discharge abnormality occurs.

Fuel pressure control system

A fuel pressure control system for a fuel supply system of an injector of an engine includes: a booster pump for increasing a high-pressure system fuel pressure; a pressure reducing valve for reducing the high-pressure system fuel pressure; and a control device for controlling the booster pump and the pressure reducing valve. The control device includes a valve opening necessity determination unit for the pressure reducing valve. The control device executes a valve opening control for opening the pressure reducing valve. The control device further includes a restriction execution unit for performing a valve opening restriction control in the valve opening control to prevent a pressure exceeding a predetermined target portion threshold pressure from being applied to a target portion.

A gas sensor is provided in an exhaust passage of an engine mounted on a vehicle. The gas sensor includes a sensor element and a heater. The sensor element detects a concentration of a specific component in exhaust gas. The heater is energized with electricity from a power source to heat the sensor element. The heater energization control device controls an amount of electricity supplied to the heater. An ambient temperature acquisition unit acquires an ambient temperature, which is a temperature of an environment surrounding the engine. An energization control unit controls the amount of electricity supplied to the heater based on the ambient temperature in temperature raising energization in which a temperature of the sensor element is raised to an active temperature when the engine is started.

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Kariya, Japan

Ryohei Sano