System and method of cylinder deactivation for optimal engine torque-speed map operation
This disclosure provides a system and method for determining cylinder deactivation in a vehicle engine to optimize fuel consumption while providing the desired or demanded power. In one aspect, data indicative of terrain variation is utilized in determining a vehicle target operating state. An optimal active cylinder distribution and corresponding fueling is determined from a recommendation from a supervisory agent monitoring the operating state of the vehicle of a subset of the total number of cylinders, and a determination as to which number of cylinders provides the optimal fuel consumption. Once the optimal cylinder number is determined, a transmission gear shift recommendation is provided in view of the determined active cylinder distribution and target operating state.
1. A method for optimizing fuel consumption in a vehicle when changing from a current operating state to a target operating state, the method comprising:
receiving data indicative of a vehicle current operating state based on at least two of power demand, engine speed, engine torque, gear number, and vehicle speed;
receiving terrain variation data;
determining vehicle target operating state including desired torque based on said terrain variation data;
determining an active cylinder distribution to minimize fuel consumption based on said determined vehicle target operating state; and
providing a transmission gear shift recommendation in view of the determined active cylinder distribution and the vehicle target operating state.
2. The method of claim 1 , wherein determining said active cylinder distribution comprises receiving a candidate minimum cylinder number corresponding to said determined vehicle target operating state and determining the optimal fueling from among cylinder numbers ranging from the minimum cylinder number to a number of total cylinders in the engine of the vehicle.
3. The method of claim 1 , wherein the terrain variation data is based on current vehicle location.
4. The method of claim 1 , wherein the terrain variation data is based on upcoming vehicle location.
5. The method of claim 1 , further comprising filtering the determined active cylinder distribution using a low pass filter.
6. The method of claim 1 , further comprising deactivating cylinders not in the active cylinder distribution one at a time.
7. The method of claim 1 , further comprising:
receiving positioning related data; and
determining a position coordinate of a vehicle within said terrain variation.
8. A system adapted to optimize fuel consumption in a vehicle when changing from a current operating state to a target operating state, comprising:
a current operating state module including data indicative of a vehicle current operating state based on at least two of power demand, engine speed, engine torque, gear number, and vehicle speed;
a terrain variation module including data indicative of terrain variation data;
a target operating state module containing a vehicle target operating state based on factors including desired torque based on said terrain variation data;
an active cylinder module containing a determination of an active cylinder distribution to minimize fuel consumption based on said determined vehicle target operating state; and
a transmission gear recommendation module containing a transmission gear shift recommendation in view of the determined active cylinder distribution and the vehicle target operating state.
9. The system of claim 8 , wherein the target operating state module is configured to determine said active cylinder distribution by receiving a candidate minimum cylinder number corresponding to determined target operating state and determining the optimal fueling from among cylinder numbers ranging from the minimum cylinder number to a number of total cylinders of in the engine of the vehicle.
10. The system of claim 8 , wherein the terrain variation data is based on current vehicle location.
11. The system of claim 8 , wherein the terrain variation data is based on upcoming vehicle location.
12. The system of claim 8 , further comprising a filter configured to low pass filter the determined active.
13. The system of claim 8 , wherein said active cylinder module is configured to deactivate cylinders not in the active cylinder distribution one at a time.
14. The system of claim 8 , further comprising: a position determining unit configured to receive positioning related data and determining a position coordinate of a vehicle within said terrain variation.