System and method for smooth transmission engagement and disengagement
AssigneeFord Global Technologies, LLC
InventorsFazal U. Syed, Zachary Sinisi, Douglas Michael Smith, Sassan Farahmand
Life of this patent
Estimating the term…
Abstract
Systems and methods for transitioning a hybrid vehicle from park or neutral to drive or reverse are presented. In one example, a requested engine speed is adjusted in response to a transmission disengaging indication and a transmission disengaging timer when a transmission is being disengaged from a gear. In another example, the requested engine speed is adjusted in response to a transmission engaging indication and a transmission engaging timer when the transmission is being engaged to a gear.
Claims19
A method for operating a vehicle, comprising:
- starting an engaging timer in response to a gear selector target not being neutral or park;
- adjusting a requested engine speed from an engine idle speed for park or an engine idle speed for neutral to an engine idle speed for drive or an engine idle speed for reverse via a controller in response to a transmission being in an engaging state and a value of the engaging timer value not exceeding a threshold, where the engaging state is when transmission fluid is being supplied to a forward or reverse clutch and pressure in the forward or reverse clutch is less than a threshold pressure;
- and
- adjusting the requested engine speed from the engine idle speed for park or the engine idle speed for neutral to the engine idle speed for drive or the engine idle speed for reverse via the controller in response to the transmission not being in the engaging state and the value of the engaging timer value exceeding the threshold.
A system, comprising:
- an engine;
- a transmission;
- a gear selector;
- and
- a controller including executable instructions stored in non-transitory memory that cause the controller to start a disengaging timer in response to the gear selector moving from reverse position or drive position into neutral or park position, and adjust a requested engine speed to an idle engine speed for park or an engine idle speed for neutral in response to not being in a disengaging state or a value of the disengaging timer exceeding a threshold value, where the disengaging timer counts an amount of time the disengaging state has been active when disengaging the transmission from a drive state or reverse state to a park state or a neutral state.
A method for operating a vehicle, comprising:
- starting a timer that counts an amount of time a disengaging state has been active when disengaging the transmission from a drive state or reverse state to a park state or a neutral state;
- and
- adjusting a requested engine speed from an engine idle speed for drive or an engine idle speed for reverse to an engine idle speed for neutral or an engine idle speed for park via a controller in response to the timer exceeding a threshold and a transmission being in a disengaging state, or in response to the timer not exceeding the threshold and the transmission not being in a disengaging state;
- and
- adjusting a speed of an engine to the requested engine speed.
Dependencies are inferred from the claim text.