Back to results
US 5,265,693 AGranted
Integrated traction control system
AssigneeSaturn Corporation
InventorsSusan L. Rees, Rimas S. Milunas, Larry T. Nitz, William J. Bolander
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeSaturn Corporation
InventorsSusan L. Rees, Rimas S. Milunas, Larry T. Nitz, William J. Bolander
Estimating the term…
A traction control system provides coordinated use of axle torque management via engine spark, engine fuel, and transmission gear ratio. Primary torque management is provided by retarding the ignition timing to reduce engine torque. When the spark retard reaches a determined limit value, the vehicle automatic transmission is upshifted which reduces axle torque and engine speed, thus reducing the amount of spark retard required to control a slip condition, thereby increasing the authority of the spark retard system. The limit spark retard threshold is established as a function of the temperature of the catalytic converter so as to prevent an overtemperature condition. Further, fuel control is ultimately used if control of ignition timing is incapable of bringing the acceleration slip under control. This condition may exist, for example, when the spark system authority of control is insufficient due to limitations placed upon its authority in response to a sensed hot catalytic converter condition.
A traction control system for a motor vehicle having wheels driven by an engine through an automatic transmission and an ignition system adapted to initiate combustion in various engine cylinders in accordance with a spark timing control signal supplied thereto in accordance with a spark timing value, the automatic transmission having a plurality of forward gear ratios varying from low to high, the system comprising, in combination:
A traction control system for a motor vehicle having wheels driven by an engine through an automatic transmission, an ignition system adapted to initiate combustion in various engine cylinders in accordance with a spark timing control signal supplied thereto in accordance with a spark timing value, and a catalytic converter through which combustion exhaust gases from the engine are discharged to the atmosphere, the automatic transmission having a plurality of forward gear ratios varying from low to high, the system comprising, in combination:
A traction control system for a motor vehicle having wheels driven by an engine through an automatic transmission, a fuel control system for delivering a quantity of fuel to various engine cylinders, and an ignition system adapted to initiate combustion in the various engine cylinders in accordance with a spark timing control signal supplied thereto in accordance with a spark timing value, the automatic transmission having a plurality of forward gear ratios varying from low to high, he system comprising, in combination:
A traction control system for a motor vehicle having wheels driven by an engine through an automatic transmission, a fuel control system for delivering a quantity of fuel to various engine cylinders, an ignition system adapted to initiate combustion in the various engine cylinders in accordance with a spark timing control signal supplied thereto in accordance with a spark timing value, and a catalytic converter through which combustion exhaust gases from the engine are discharged to the atmosphere, the automatic transmission having a plurality of forward gear ratios varying from low to high, the system comprising, in combination:
Dependencies are inferred from the claim text.