Denso Corporation

Denso Corpora Tion

Tomomi Oshima

Eiji Takemoto

An abnormality determination device is used in an exhaust gas purification system. The exhaust gas purification system is disposed in an exhaust gas passage of an internal-combustion engine and includes an injection valve for injecting a liquid reducing agent to a NOpurification catalyst for purifying NOin an exhaust gas, and a pump for pressurizing and supplying the reducing agent to the injection valve via a reducing agent passage. The abnormality determination device includes an acquisition section acquiring a rotation speed of the pump when the injection valve is injecting the reducing agent as an injection time rotation speed; and a determiner determining whether the injection valve has an abnormality based on the injection time rotation speed.

Abnormality determination device

An injection controller that is applied to an exhaust purification system including an injector that is located in an exhaust passage of an internal combustion engine and injects to supply a reducing agent in a liquid state to a NOx purification catalyst purifying NOx in an exhaust gas, and a pump that pressurizes and pumps the reducing agent to the injector through a reducing-agent passage. The injection controller includes an acquisition unit configured to acquire a variation quantity of a rotational speed of the pump caused in response to an injection of the injector or a correlation value that is a value correlative to the variation quantity, as a rotational variation parameter, and a determination unit configured to determine whether an air mixing exists in the reducing-agent passage based on the rotational variation parameter.

Injection controller

In the control unit of internal combustion engine, in which the exhaust gas recirculation (EGR) quantity to an intake pipe is adjusted by the EGR valve, an EGR regulator controls an opening degree of the EGR valve according to the fuel injection value. And the EGR regulator decreases the opening degree of the EGR valve quickly to the minimum when the increase of the fuel injection valve in a unit time exceeds a criterial value. Further, an EGR buffer prevents the EGR regulator from quick-decreasing the opening degree of the EGR valve when the fuel injection value is wiggling by the operation of the cruise controller.

Growing community of inventors

Kariya, Japan

Tomomi Oshima