Recursive vehicle mass estimation
First Claim
1. A method of estimating the mass of a vehicle, the vehicle including an internal combustion engine, the engine producing a torque in accordance with a fueling rate provided by a fueling system thereof, the torque being applied to a drive-train coupled to the engine, the drive train including a transmission coupled to the engine having a plurality of engageable gear ratios, a drive axle and a propeller shaft coupling the drive axle to the transmission, the drive axle including at least one wheel for moving the vehicle, the method comprising:
- (a) periodically determining a vehicle speed and a vehicle push force corresponding to the vehicle speed and storing corresponding vehicle speed and vehicle push force data within a memory portion of a control computer;
(b) qualifying a segment of the vehicle speed and push force data; and
(c) determining vehicle mass by a recursive least square estimation analysis of the segment of data by defining the vehicle speed as a function of the push force.
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Abstract
A method and apparatus is disclosed for recursively estimating vehicle mass and/or aerodynamic coefficient of a moving vehicle. The vehicle speed and push force data are collected and a segment of qualified data is then selected from the collected data. Newton'"'"'s second law is integrated to express vehicle mass and/or aerodynamic coefficient in terms of vehicle push force and vehicle speed. This expression is then used in a recursive analysis of the qualified data segment to determine an estimated vehicle mass and/or aerodynamic coefficient.
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Citations
13 Claims
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1. A method of estimating the mass of a vehicle, the vehicle including an internal combustion engine, the engine producing a torque in accordance with a fueling rate provided by a fueling system thereof, the torque being applied to a drive-train coupled to the engine, the drive train including a transmission coupled to the engine having a plurality of engageable gear ratios, a drive axle and a propeller shaft coupling the drive axle to the transmission, the drive axle including at least one wheel for moving the vehicle, the method comprising:
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(a) periodically determining a vehicle speed and a vehicle push force corresponding to the vehicle speed and storing corresponding vehicle speed and vehicle push force data within a memory portion of a control computer; (b) qualifying a segment of the vehicle speed and push force data; and (c) determining vehicle mass by a recursive least square estimation analysis of the segment of data by defining the vehicle speed as a function of the push force. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification