Automotive control unit programmed to estimate road slope and vehicle mass, vehicle with such a control unit and corresponding program product
First Claim
1. An automotive electronic control system comprising:
- an accelerometer;
a sensor associated with the accelerometer for providing a vehicle acceleration signal;
a vehicle speed sensor for providing a vehicle speed signal;
a plurality of vehicle propulsion and torque sensors for providing vehicle propulsive/resistive torque signals;
a stationary lateral compensation means which makes a correction to limit vehicle lateral dynamics that, in curves, introduces an additional term to the vehicle acceleration signal wherein said lateral compensation means is based on a bike model and on target parameters of the vehicle;
a forgetting factor means which minimizes prediction error according to quadratic principles and reduces recursive least squares problems regarding progressive decay of algorithm reactivity with sampling aging;
an electronic control unit configured to receive the vehicle acceleration signal, the vehicle speed signal, and the vehicle propulsive/resistive torque signals for generating a command for vehicular control based in part on the vehicle mass, wherein the vehicle mass is estimated in real time;
when the vehicle is in motion,compensating for accelerometric disturbances due to;
the vehicle dynamic pitch;
accelerometric components due to the vehicle lateral dynamics; and
based on a recursive least square algorithm with the forgetting factor inputted with a compensated acceleration signal for the vehicle, andat different low gears, to estimate the vehicle mass and associated variance for each gear, andbased on the vehicle mass estimations and corresponding variances for each gear,minimizing uncertainties on propulsive/resistive torque due to gear efficiency and rolling resistance; and
a vehicle control means for providing automated control of the vehicle based on the control command from the electronic control unit.
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Abstract
Automotive electronic control unit programmed to realtime estimate either or both of vehicle mass and road slope, wherein; a. road slope, is estimated; a1. when vehicle is considered stopped based on an accelerometer signal indicative of vehicle acceleration, wherein the vehicle is considered stopped in the presence of substantially zero values of a speed signal indicative of vehicle speed, and a2. when vehicle is in rectilinear and curvilinear motion by implementing a road slope observer based on a linear Kalman filter, which is designed to: a21. operate based on signals indicative of vehicle speed and acceleration, and a22. compensate for accelerometric disturbances due to; a221. vehicle static pitch resulting from vehicle load distribution, and a222. vehicle dynamic pitch due to acceleration to which vehicle is subjected during motion, and a223. accelerometric disturbance components due to vehicle lateral dynamics; b. vehicle mass is estimated: b1. when vehicle is in motion, and b2. based on a recursive least square algorithm with forgetting factor, and b3. based on an accelerometric signal indicative of vehicle acceleration, on a vehicle speed signal, and other signals representing a vehicle propulsive/resistive torque, and b4. at different low gears, to provide a mass estimation and an associated variance for each gear, and b5. based on mass estimations and corresponding variances for each gear, and b6. compensating for accelerometer disturbances due to: b61, vehicle dynamic pitch; and b62. accelerometric disturbance components due to vehicle lateral dynamics; and b7. minimizing uncertainties on propulsive/resistive torque due to gear efficiency and rolling resistance.
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Citations
14 Claims
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1. An automotive electronic control system comprising:
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an accelerometer; a sensor associated with the accelerometer for providing a vehicle acceleration signal; a vehicle speed sensor for providing a vehicle speed signal; a plurality of vehicle propulsion and torque sensors for providing vehicle propulsive/resistive torque signals; a stationary lateral compensation means which makes a correction to limit vehicle lateral dynamics that, in curves, introduces an additional term to the vehicle acceleration signal wherein said lateral compensation means is based on a bike model and on target parameters of the vehicle; a forgetting factor means which minimizes prediction error according to quadratic principles and reduces recursive least squares problems regarding progressive decay of algorithm reactivity with sampling aging; an electronic control unit configured to receive the vehicle acceleration signal, the vehicle speed signal, and the vehicle propulsive/resistive torque signals for generating a command for vehicular control based in part on the vehicle mass, wherein the vehicle mass is estimated in real time; when the vehicle is in motion, compensating for accelerometric disturbances due to; the vehicle dynamic pitch; accelerometric components due to the vehicle lateral dynamics; and based on a recursive least square algorithm with the forgetting factor inputted with a compensated acceleration signal for the vehicle, and at different low gears, to estimate the vehicle mass and associated variance for each gear, and based on the vehicle mass estimations and corresponding variances for each gear, minimizing uncertainties on propulsive/resistive torque due to gear efficiency and rolling resistance; and a vehicle control means for providing automated control of the vehicle based on the control command from the electronic control unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for automatically estimating vehicular mass in real time for a vehicle in motion for vehicular control, comprising:
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obtaining a vehicle acceleration signal from an accelerometer; obtaining a vehicle speed signal and signals representing vehicle propulsive force from the vehicle speed sensors and from the vehicle propulsion and torque sensors; adjusting, the vehicle acceleration signal when the vehicle is in motion for accelerometric disturbances due to the vehicle dynamic pitch and for accelerometric components due to the vehicle lateral dynamics wherein the lateral dynamics are introduced in an estimator compensation block using bike model and on-target parameters; inputting the adjusted vehicle acceleration signal for the vehicle to a recursive least square function with a forgetting factor tied to the compensated acceleration signal wherein the forgetting factor minimizes prediction error according to quadratic principles, and reduces recursive least squares problems regarding progressive decay of algorithm reactivity with sampling aging, and generating automatically in real time the vehicle mass signals corresponding to variances for each gear based on a the vehicle mass estimated for each gear while minimizing uncertainties on the propulsive/resistive torque signals due to gear efficiency and rolling resistance; and
automatically controlling the vehicle based on the real time vehicle mass signals.
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Specification