Control system for integrally controlling operations of electronic torque split system and traction control system for automotive vehicle

A combination of a torque split system and a traction control system for an automative vehicle, said vehicle including pairs of front and rear wheels, one of said pairs being a primary driven wheel pair to which engine torque is constantly delivered and the other being an auxiliary driven wheel pair to which the engine torque is variably delivered, said torque split system variably modifying a torque distribution ratio to said primary and auxiliary driven wheel pairs in accordance with a difference between a rotation speed of said primary driven wheel pair and a rotation speed of said auxiliary driven wheel pair, and a lateral acceleration of said vehicle, comprising:

• primary driven wheel slippage detecting means for detecting primary driven wheel slippage and providing a signal indicative thereof;
• auxiliary driven wheel slippage detecting means for detecting auxiliary driven wheel slippage and providing a signal indicative thereof;
• cornering condition detecting means for detecting a cornering condition of the vehicle and providing a signal indicative thereof;
• and
• controlling means, responsive to the signals from said primary driven wheel slippage detecting means, said auxiliary driven wheel slippage detecting means, and said cornering condition detecting means, for controlling operations of the torque split control system and the traction control system,
• wherein when the auxiliary driven wheel slippage exceeds an auxiliary driven wheel target slippage value which is determined in a preselected relation to the cornering condition detected by said cornering condition detecting means, said controlling means activates the torque split system to modify an amount of engine torque distribution to the auxiliary driven wheel pair so that the auxiliary driven wheel slippage is adjusted toward the auxiliary driven wheel target slippage value, and activates the traction control system to modify driving torque of the primary driven wheel pair for maintaining the primary driven wheel slippage within a preselected allowable range.

A combination of a torque split system and a traction control system for an automotive vehicle, said vehicle including pairs of front and rear wheels, one of said pairs being a primary driven wheel pair to which engine torque is constantly delivered and the other being an auxiliary driven wheel pair to which the engine torque is variably delivered, comprising:

• primary driven wheel slippage detecting means for detecting primary driven wheel slippage and providing a signal indicative thereof;
• auxiliary driven wheel slippage detecting means for detecting auxiliary driven wheel slippage and providing a signal indicative thereof;
• cornering condition detecting means for detecting a yaw rate condition of the vehicle and providing a signal indicative thereof;
• and
• controlling means, responsive to the signals from said primary driven wheel slippage detecting means, said auxiliary driven wheel slippage detecting means, and said cornering condition detecting means, for controlling operations of the torque split control system and the traction control system,
• wherein when the auxiliary driven wheel slippage exceeds an auxiliary driven wheel target slippage value which is determined in a preselected relation to the yaw rate condition detected by said cornering condition detecting means, said controlling means activates the torque split system to modify an amount of engine torque distribution to the auxiliary driven wheel pair so that the auxiliary driven wheel slippage is adjusted toward the auxiliary driven wheel target slippage value, and activates the traction control system to modify driving torque of the primary driven wheel pair for maintaining the primary driven wheel slippage within a preselected allowable range.