Purification system
AssigneeIsuzu Motors Limited
InventorYasuhiro Okubo
Life of this patent
Estimating the term…
Abstract
A purification system includes a clutch that switches between transmitting and interrupting power of an engine to a driven device, which is driven by power of the engine and a motor, a catalyst that i) adsorbs nitrogen oxides if an air-fuel ratio is a threshold value or more, and ii) facilitates a reaction between unburned fuel and the adsorbed nitrogen oxides if the air-fuel ratio is less than the threshold value, a clutch controller that brings the clutch into the disengaged state thereby enabling the driven device to be driven solely by the power of the motor, and an operation controller that brings the air-fuel ratio of the engine to be less than the threshold value if the driven device is driven solely by the power of the motor.
Claims10
A purification system comprising:
- a clutch that switches between transmitting and interrupting power of an engine to a driven device, which is driven by the power of the engine and power of a motor;
- a catalyst that i) adsorbs nitrogen oxides in exhaust gas of the engine if an air-fuel ratio is a predetermined air-fuel ratio or more, and ii) facilitates a reaction between unburned fuel contained in gas discharged from the engine and the adsorbed nitrogen oxides if the air-fuel ratio is less than the predetermined air-fuel ratio;
- an acquisition part that acquires an adsorption amount of the nitrogen oxides adsorbed to the catalyst;
- a clutch controller that controls the clutch to interrupts the power of the engine to the driven device if the driven device is driven by the power of the engine and the adsorption amount reaches or exceeds a predetermined value;
- and
- an operation controller that brings the air-fuel ratio of the engine in operation to be less than the predetermined air-fuel ratio if the adsorption amount reaches or exceeds the predetermined value and the driven device is driven solely by the power of the motor,
- wherein
- the acquisition part acquires a driving load of the driven device, and
- when the adsorption amount reaches or exceeds the predetermined value, the operation controller i) decreases output ratio of the engine relative to the driving load and ii) increases output ratio of the motor relative to the driving load, with the clutch in an engaged state where the power of the engine is transmitted to the driven device.
A purification system comprising:
- a clutch that switches between transmitting and interrupting power of an engine to a driven device, which is driven by the power of the engine and power of a motor;
- a catalyst that i) adsorbs nitrogen oxides in exhaust gas of the engine if an air-fuel ratio is a predetermined air-fuel ratio or more, and ii) facilitates a reaction between unburned fuel contained in gas discharged from the engine and the adsorbed nitrogen oxides if the air-fuel ratio is less than the predetermined air-fuel ratio;
- an acquisition part that acquires an adsorption amount of the nitrogen oxides adsorbed to the catalyst;
- a clutch controller that controls the clutch to interrupts the power of the engine to the driven device if the driven device is driven by the power of the engine and the adsorption amount reaches or exceeds a predetermined value;
- and
- an operation controller that brings the air-fuel ratio of the engine in operation to be less than the predetermined air-fuel ratio if the adsorption amount reaches or exceeds the predetermined value and the driven device is driven solely by the power of the motor,
- wherein the acquisition part references a data table indicating a relationship between an integrated value of an amount of exhaust gas and an adsorption amount to acquire an adsorption amount corresponding to an integrated value obtained by integrating an amount of exhaust gas discharged from the engine per unit time from a time point when the adsorption amount reaches a lower limit value of an amount that can be adsorbed to the catalyst to a current time point.
Dependencies are inferred from the claim text.