Engine control apparatus and engine operating method
AssigneeNissan Diesel Motor Co., Ltd.
InventorsKiminobu Hirata, Takehiro Esaka
Life of this patent
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Abstract
When an abnormality occurred in a SCR device is detected, the output of an engine is restricted. To this end, in one embodiment, at the time of an abnormality occurrence, a map adopted for calculating a fuel injection quantity is switched from that for a normal time (S407). Further, as the abnormality to be detected, the clogging of an injection nozzle, the dilution of urea water stored in a tank, or the like is adopted.
Claims20
An engine control apparatus mounted on a vehicle and configured to be in cooperation with an engine, the engine including an addition device for adding a NOx reducing agent to exhaust gas of the engine, the engine control apparatus comprising:
- a control unit for controlling the engine, wherein
- the control unit is configured to detect an abnormality occurrence in the addition device, and to restrict an output torque of the engine in response to detecting the abnormality occurrence in the addition device so that a vehicle speed is restricted at or smaller than a predetermined value.
An engine control apparatus mounted on a vehicle and configured to be in cooperation with an engine, the engine including an addition device for adding a NOx reducing agent to exhaust gas of the engine, the engine control apparatus comprising:
- detection means for detecting an abnormality occurrence in the addition device;
- and
- control means for restricting an output torque of the engine in response to detection of the abnormality occurrence in the addition device by the detection means so that a vehicle speed is restricted at or smaller than a predetermined value.
A method for operating an engine mounted on a vehicle at both a time of an abnormality occurrence when an abnormality occurs in an addition device, and a normal time other than the time of the abnormality occurrence, the addition device being disposed in the engine to add a NOx reducing agent to exhaust gas of the engine, the method comprising the steps of:
- operating, at the normal time, the engine with a first characteristic in which an output torque of the engine corresponding to an accelerator operating amount by a driver is obtained, wherein an operating condition of the engine is detected, and an amount of the NOx reducing agent corresponding to the detected operating condition is added by the addition device, and
- in response to a detection of an abnormality occurrence, operating the engine with a second characteristic in which the output torque of the engine relative to the accelerator operating amount is decreased from that obtained when operating the engine with the first characteristic, so that a vehicle speed is restricted at or smaller than a predetermined value.
Dependencies are inferred from the claim text.