Systems and methods for re-starting engine during coasting event
A system, method, and apparatus includes management of engine off coasting during operation of a vehicle. The engine speed is increased and/or fueling of the engine is re-initiated before the engine and driveline are finally engaged when the engine off coasting mode of operation is terminated.
1. A method comprising:
operating a vehicle in a coasting mode during which fuel to an engine of the vehicle is cut-off and a driveline of the vehicle is disengaged from the engine while the vehicle coasts;
determining the coasting mode of operation of the vehicle is to be terminated;
in response to the determining, selecting an engine re-start mode that increases a speed of the engine by coupling the engine to the driveline, wherein the engine re-start mode includes initiating closing a clutch between the driveline and the engine before re-initiating fueling to the engine and re-initiating fueling to the engine during closing the clutch in response to the speed of the engine increasing to a speed threshold less than a desired operating speed; and
re-engaging the driveline to the engine in response to the speed of the engine being increased to the desired operating speed.
2. A method comprising:
operating a vehicle in a coasting mode during which fuel to an engine of the vehicle is cut-off and a driveline of the vehicle is disengaged from the engine while the vehicle coasts;
determining the coasting mode of operation of the vehicle is to be terminated;
in response to the determining, selecting an engine re-start mode that increases a speed of the engine by coupling the engine to the driveline, wherein the engine re-start mode includes initiating closing a clutch between the driveline and the engine, then re-opening the clutch before re-initiating fueling to the engine, and then re-initiating fueling to the engine while the clutch is re-opened; and
re-engaging the driveline to the engine in response to the speed of the engine being increased to a desired operating speed.
3. The method of claim 2 , wherein the clutch is re-opened in response to the speed of the engine increasing to a first threshold less than the desired operating speed.
4. The method of claim 3 , further comprising re-closing the clutch in response to the speed of the engine achieving a second threshold greater than the first threshold via fueling to the engine.
5. The method of claim 4 , wherein the second threshold approximates the desired operating speed.
6. The method of claim 1 , wherein in response to determining the coasting mode of operation of the vehicle is to be terminated, first selecting a different engine re-start mode that increases the speed of the engine by engaging a starter to increase the speed of the engine to a first threshold before re-initiating fueling the engine, and then disengaging the starter in response to the speed of the engine reaching the first threshold and then selecting the engine re-start mode that increases the speed of the engine by coupling the engine to the driveline.
7. The method of claim 6 , further comprising closing the clutch after increasing the speed of the engine to a second threshold greater than the first threshold via re-initiating fueling to the engine.
8. An apparatus comprising:
a coasting controller for a vehicle having an engine structured to provide motive power to the vehicle, wherein the coasting controller is configured to:
operate the vehicle in a coasting mode during which fuel to the engine of the vehicle is cut-off and a driveline of the vehicle is disengaged from the engine while the vehicle coasts;
determine the coasting mode is to be terminated;
select an engine re-start mode that couples the engine to the driveline, wherein the engine re-start mode includes initiating closing a clutch between the driveline and the engine to increase a speed of the engine before and re-initiating fueling of the engine and re-initiating fueling to the engine during closing the clutch in response to the speed of the engine increasing to a speed threshold less than a desired operating speed; and
re-engage the driveline to the engine in response to the speed of the engine reaching a desired operating speed.
9. An apparatus comprising:
a coasting controller for a vehicle having an engine structured to provide motive power to the vehicle, wherein the coasting controller is configured to:
operate the vehicle in a coasting mode during which fuel to the engine of the vehicle is cut-off and a driveline of the vehicle is disengaged from the engine while the vehicle coasts;
determine the coasting mode is to be terminated;
select an engine re-start mode that couples the engine to the driveline, wherein the engine re-start mode includes initiating closing a clutch between the driveline and the engine to increase a speed of the engine, re-opening the clutch before fueling to the engine is re-initiated, and then re-initiate fueling to the engine while the clutch is re-opened; and
re-engage the driveline to the engine in response to the speed of the engine reaching a desired operating speed.
10. The apparatus of claim 9 , wherein the coasting controller is configured to re-open the clutch in response to the speed of the engine increasing to a first threshold less than the desired operating speed.
11. The apparatus of claim 10 , wherein the coasting controller is configured to re-close the clutch in response to the speed of the engine achieving a second threshold greater than the first threshold via fueling re-initiated to the engine.
12. The apparatus of claim 11 , wherein the second threshold approximates the desired operating speed.