Slippage control system using estimated road surface resistances
AssigneeMazda Motor Corporation
InventorsToshiaki Tsuyama, Toru Onaka
Life of this patent
Estimating the term…
Abstract
A vehicle slippage control system has wheel drive torque controlled so as to prevent drive wheels from excessively slipping on a road and is regulated in accordance with road surface resistances. The system estimates lateral and rectilinear road surface resistances on the basis of lateral and rectilinear gravitational acceleration of the vehicle, respectively, and then selects one of the estimated lateral and rectilinear road surface resistances, on the basis of predetermined terms, as an effective road surface resistance in accordance with which wheel drive torque is changed.
Claims21
A slippage control system for an automotive vehicle, in which wheel drive torque is controlled to prevent the drive wheels from slippage excessively on a road and is regulated in accordance with road surface resistances, said slippage control system comprising:
- slippage detecting means for detecting slippage of at least one of said drive wheels;
- lateral gravitational acceleration detecting means for detecting a lateral gravitational acceleration of the automotive vehicle while it is running;
- rectilinear gravitational acceleration detecting means for detecting a rectilinear gravitational acceleration of the automotive vehicle while it is running;
- control means for determining when the automotive vehicle is spinning, estimating a first road surface resistance on the basis of the lateral gravitational acceleration of the automotive vehicle detected by said lateral gravitational acceleration detecting means, estimating a second road surface resistance on the basis of the rectilinear gravitational acceleration of the automotive vehicle detected by said rectilinear gravitational acceleration detecting means, and obtaining an effective road surface resistance from one of said first and second road surface resistances and an alternative road surface resistance used when said automotive vehicle is spinning;
- and
- torque regulating means for decreasing wheel drive torque based on the slippage of said at least one driving wheel detected and the effective road surface resistance obtained.
Dependencies are inferred from the claim text.