Vehicle mass and road load estimation in an EV condition
First Claim
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1. A method comprising:
- determining relevant mass of a vehicle during a low speed condition while the vehicle is powered only by an electric motor, the low speed condition comprising a speed of the vehicle determined at a time when launch inertia no longer contributes to the speed of the vehicle;
calculating road load associated with the vehicle based on the relevant mass of the vehicle, current acceleration or deceleration of the vehicle, and current drive force of the vehicle; and
dynamically adjusting the current drive force of the vehicle based upon the relevant mass of the vehicle, the road load associated with the vehicle, and current road grade, the dynamic adjustment being at least one of a response to at least one of a current road condition and a current operating characteristic of the vehicle, and a preemptive action in anticipation of at least one of an upcoming road condition and an upcoming operating characteristic of the vehicle.
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Abstract
Systems and methods provide accurate determinations of relevant vehicle mass that can take into account any load being carried and/or towed by a vehicle, such as an electric vehicle or hybrid vehicle. Systems and methods also provide accurate road load measurements that can take into account road gradient(s) and the impact of gravity. Accordingly, the dynamic nature of relevant vehicle mass and road load can be captured. Efforts to optimize operation and/or take preemptive action to provide more efficient performance, enhance the drive experience, etc. can be better achieved through the more accurate determinations of relevant vehicle mass and road load achieved by these systems and methods.
42 Citations
18 Claims
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1. A method comprising:
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determining relevant mass of a vehicle during a low speed condition while the vehicle is powered only by an electric motor, the low speed condition comprising a speed of the vehicle determined at a time when launch inertia no longer contributes to the speed of the vehicle; calculating road load associated with the vehicle based on the relevant mass of the vehicle, current acceleration or deceleration of the vehicle, and current drive force of the vehicle; and dynamically adjusting the current drive force of the vehicle based upon the relevant mass of the vehicle, the road load associated with the vehicle, and current road grade, the dynamic adjustment being at least one of a response to at least one of a current road condition and a current operating characteristic of the vehicle, and a preemptive action in anticipation of at least one of an upcoming road condition and an upcoming operating characteristic of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A vehicle, comprising:
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one or more electric motors; and an electronic control unit adapted to; determine that the vehicle is operating in a travel mode during which only the one or more electric motors are being used to drive the vehicle; determine a relevant mass of the vehicle after passage of a launch condition based upon the drive force generated by the one or more motors and calculated at the wheels of the vehicle; and determine a road load associated with the vehicle as a function of the relevant mass of the vehicle after passage of the launch condition. - View Dependent Claims (16, 17, 18)
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Specification