Controlling internal combustion engine emissions
AssigneeJaguar Land Rover Limited
InventorsRob Jerger, David Hayden, Simon Jarvis
Life of this patent
Estimating the term…
Abstract
The invention relates to a method for heating a catalyst. When the engine is started, engine speed is maintain at high rpm. This high rpm is maintained even if the driver shifts the transmission out of neutral, at time (A). Engine speed is lowered if an indication that the driver wishes to drive off is detected, at time (C), e.g. release of the brake pedal. The shaded area shows the additional contribution to catalyst warm up. The high rpm may be disabled if catalyst temperature is high enough or if the vehicle is parked on a slope. The invention also relates to a vehicle carrying out the method.
Claims20
A method of initiating treatment of the exhaust stream of an internal combustion engine of a vehicle having wheel brakes and a drive line, the method comprising:
- starting the vehicle engine;
- running the vehicle engine at a first idle speed;
- detecting movement of a drive line selector from a neutral to a drive condition while vehicle wheel brakes are activated;
- delaying enablement of said drive line until at least one indication that a driver desires that the vehicle start moving is detected, so as to prolong duration of said first idle speed;
- and
- reducing engine speed from the first idle speed to second, lower idle speed for drive line enablement.
(canceled)
A vehicle, comprising:
- an internal combustion engine;
- wheel brakes;
- a drive line;
- a drive line selector;
- and
- a controller that is configured to
- run the engine at a first idle speed while the drive line selector corresponds to a neutral condition;
- detect movement of the drive line selector from the neutral to a drive condition while the wheel brakes are activated;
- delay enablement of said drive line after the detected movement while maintaining the first idle speed until determining that at least one criterion is satisfied;
- and
- enable the drive line and reduce engine speed from the first idle speed to a second, lower idle speed when the at least one criterion is satisfied.
Dependencies are inferred from the claim text.