Method for controlling an engine during a restart
Various systems and methods are described for controlling an engine in a vehicle, the engine being coupled to a transmission. One example method comprises, under selected braking conditions, shutting-off the engine and spinning-down the engine to rest while the vehicle is traveling, and in response to a foot-off-brake event, restarting the engine by at least partially engaging the transmission and adjusting engine torque control actuators.
1. A method for controlling an engine, the engine being coupled to a transmission, comprising:
spinning down the engine to a rest state;
in response to a first operating condition, restarting the engine by at least partially engaging the transmission to assist in spinning-up of the engine from the rest state while a vehicle is traveling; and
adjusting at least one of a throttle position, spark advance, cam angle, and fuel timing in response to a second operating condition.
2. The method of claim 1 , wherein the first operating condition and the second operating condition are a same operating condition.
3. The method of claim 1 , wherein the first and second operating conditions are different operating conditions.
4. The method of claim 2 , wherein the first operating condition is a change in a position of a brake pedal.
5. The method of claim 3 , wherein the second operating condition is a vehicle speed.
6. The method of claim 1 , wherein at least one of the throttle position, spark advance, and fuel timing is adjusted in relation to vehicle speed at time of restart.
7. The method of claim 1 , wherein the fuel timing is advanced or retarded relative to crankshaft angle at which fuel was delivered to the engine prior to last engine stop.
8. The method of claim 1 , wherein a cam is adjusted to an angle related to engine road load.
9. The method of claim 1 , further comprising engaging a starter to assist in spinning-up of the engine.
10. The method of claim 9 , wherein the starter is engaged before torque from the transmission is applied to the engine by engaging a transmission clutch.