Method for controlling an automatic gearbox according to a road profile
First Claim
1. A method of controlling a road vehicle automatic transmission by computer utilizing the information regarding speed of travel and transverse acceleration of the vehicle and engine load, so as to apply various road profile dependent shift laws to the transmission, wherein the computer of the transmission applies various shift laws for the ratios according to the value of an activity coefficient Kcorner dependent on the speed of travel of the vehicle (V), on the lateral acceleration of the vehicle (Gt) and on its derivative with respect to time (dGt/dt), and wherein the computer applies various discrete change of ratio laws.
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Abstract
A method for automatically controlling the gearbox of a road vehicle uses a computer using information on displacement speed and transversal acceleration of the vehicle and engine load in order to apply various shifting rules according to the road profile. The gearbox computer applies different gear shifting rules according to the value of a coefficient of activity Kbend depending on the displacement speed of the vehicle (V), the lateral acceleration of the vehicle (Gt) and the derivative thereof in relation to time (dGt/dt).
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Citations
19 Claims
- 1. A method of controlling a road vehicle automatic transmission by computer utilizing the information regarding speed of travel and transverse acceleration of the vehicle and engine load, so as to apply various road profile dependent shift laws to the transmission, wherein the computer of the transmission applies various shift laws for the ratios according to the value of an activity coefficient Kcorner dependent on the speed of travel of the vehicle (V), on the lateral acceleration of the vehicle (Gt) and on its derivative with respect to time (dGt/dt), and wherein the computer applies various discrete change of ratio laws.
- 13. A method of controlling a road vehicle automatic transmission by computer utilizing the information regarding speed of travel and transverse acceleration of the vehicle and engine load, so as to apply various road profile dependent shift laws to the transmission, wherein the computer of the transmission applies various shift laws for the ratios according to the value of an activity coefficient Kcorner dependent on the speed of travel of the vehicle (V), on the lateral acceleration of the vehicle (Gt) and on its derivative with respect to time (dGt/dt), and wherein the activity coefficient Kcorner is obtained from the product of the transverse acceleration (Gt) and its derivative with respect to time (dGt/dt).
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19. A method of controlling a road vehicle automatic transmission by computer utilizing the information regarding speed of travel and transverse acceleration of the vehicle and engine load, so as to apply various road profile dependent shift laws to the transmission, wherein the computer of the transmission applies various shift laws for the ratios according to the value of an activity coefficient Kcorner dependent on the speed of travel of the vehicle (V), on the lateral acceleration of the vehicle (Gt) and on its derivative with respect to time (dGt/dt), and wherein the computer adopts a set of shift laws which is suitable for roads which are not very bendy when the activity coefficient Kcorner is below a specified threshold.
Specification