Vehicle control system and methods
A control system that makes adjustments, such as limiting the maximum speed or maximum torque in a vehicle, is provided. These adjustments can be based on knowledge about the vehicle and trip, and on the estimated energy remaining. The control system is applicable to a wide range of vehicles, including ground, air, water, and sea vehicles, as well as vehicles powered by battery, electricity, compressed natural gas, or even liquid fuel propulsion systems. The control system may be used to adjust vehicle operation in route to assure the vehicle reaches a destination and to inform or counteract a human vehicle operator. Control system can also be used in racing applications to calculate the fastest-possible race speed and drive torque for a given race length; or alternatively, in endurance racing or delivery applications to optimize the vehicle speed and/or drive torque for a given race length or route.
1. A method for ensuring a vehicle reaches its intended destination, comprising the steps of:
a) receiving information to determine a starting position for the vehicle;
b) receiving information relating to an intended destination for the vehicle;
c) computing at least one route between the starting position and the intended destination considering at least one of:
(i) topographical features along said route;
(ii) actual, predicted, or historical traffic along said route;
(iii) actual, predicted, or historical weather along said route;
(iv) distance;
(v) driving speed;
d) iteratively estimating energy available to the vehicle during a trip, wherein the step of iteratively estimating the energy available to the vehicle includes:
(i) receiving an input from a rate sensor and an input from a value sensor;
(ii) integrating the rate sensor input to determine an integrated energy estimate;
(iii) comparing the integrated energy estimate to the value sensor input to determine a difference;
(iv) calculating the energy available by adjusting the value sensor input at a rate corresponding to the difference resulting from the comparison; and
(v) repeating steps (i) to (iv) during the course of the trip;
e) determining whether the energy available to the vehicle is sufficient to propel the vehicle from the starting position to the intended destination based on the at least one computed route; and
f) generating a signal based on the results obtained in step (e).
2. The method of claim 1 , wherein in an electric application, the rate sensor input includes battery current.
3. The method of claim 2 , wherein in an electric application, the value sensor input includes battery voltage.
4. The method of claim 1 , wherein in a liquid fuel application, the rate sensor input includes fuel injector open time or fuel injector pressure differential.
5. The method of claim 4 , wherein in a liquid fuel application, the value sensor input includes tank level.
6. A system for ensuring a vehicle reaches its intended destination comprising:
at least one user device having at least one user application; and
a vehicle controller having a destination assurance engine, the destination assurance engine including a stored energy estimator configured to iteratively estimate energy available to the vehicle during a trip by:
(i) receiving an input from a rate sensor and an input from a value sensor;
(ii) integrating the rate sensor input to determine an integrated energy estimate;
(iii) comparing the integrated energy estimate to the value sensor input to determine a difference;
(iv) calculating the energy available by adjusting the value sensor input at a rate corresponding to the difference resulting from the comparison; and
(v) repeating steps (i) to (iv) during the course of the trip.
7. The system of claim 6 , wherein in an electric application, the rate sensor input includes battery current.
8. The system of claim 7 , wherein in an electric application, the value sensor input includes battery voltage.
9. The system of claim 6 , wherein in a liquid fuel application, the rate sensor input includes fuel injector open time or fuel injector pressure differential.
10. The system of claim 9 , wherein in a liquid fuel application, the value sensor input includes tank level.