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US 9,714,613 B2Granted
Throttle adjustment during deceleration fuel shut off
AssigneeFord Global Technologies, LLC
InventorsPatrick Kevin Holub, Thomas G. Leone
Life of this patent
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Abstract
Methods and systems are provided for adjusting a throttle during deceleration fuel shut off (DFSO). In one example, a method may comprise controlling a position of a throttle in an air inlet of an engine propelling a vehicle, in relation to vehicle operator commands, and during a deceleration fuel shut off mode, increasing opening of said throttle independently of said operator commands when speed of said vehicle is or is expected to fall below a desired speed or desired speed trajectory.
Claims16
A method comprising:
- controlling a position of a throttle, in an air inlet of an engine propelling a vehicle, in relation to vehicle operator commands;
- and
- during a deceleration fuel shut off (DFSO) mode, adjusting an opening of said throttle independently of said vehicle operator commands to maintain a speed of said vehicle at a desired speed or desired speed trajectory, wherein the adjusting comprises increasing the opening of said throttle when said vehicle speed is or is expected to fall below the desired speed or desired speed trajectory, and decreasing the opening of said throttle when said vehicle speed is or is expected to rise above said desired speed or desired speed trajectory during said DFSO mode;
- and
- when exiting the DFSO mode and resuming fuel injection:
- retarding a spark timing in response to an intake mass airflow rate exceeding a desired intake mass airflow rate, where the desired intake mass airflow rate is determined based on the vehicle operator commands.
3 more elements
A method comprising:
- controlling a position of a throttle, in an air inlet of an engine propelling a vehicle, in relation to vehicle operator commands;
- and
- during a deceleration fuel shut off mode, increasing an opening of said throttle independently of said vehicle operator commands in response to an indication that a temperature of a catalyst coupled to an exhaust of said engine will remain above a threshold during said deceleration fuel shut off mode with the throttle open;
- and
- when exiting the deceleration fuel shut off mode, injecting fuel to cylinders of said engine, and in response to a mass airflow rate in the engine being greater than a desired mass airflow rate due to said increased throttle opening, retarding a spark timing from a set point, where the desired mass airflow rate is determined based on the vehicle operator commands and a desired air/fuel ratio.
2 more elements
A system comprising:
- a four stroke combustion engine;
- a throttle positioned in an engine intake of the engine for regulating airflow to engine cylinders of the engine;
- an input device configured to generate an output corresponding to an operator commanded torque;
- and
- a controller with computer readable instructions for:
- during a deceleration fuel shut off mode, increasing an opening of the throttle independently of the operator commanded torque in response to an indication a vehicle speed is or is expected to fall below a desired speed trajectory;
- otherwise
- controlling the position of the throttle in relation to the operator commanded torque;
- and
- delaying fuel injection to the engine cylinders when exiting the deceleration fuel shut off mode when a mass airflow rate in the engine is greater than a desired mass airflow rate.
7 more elements
Dependencies are inferred from the claim text.