Driving force control apparatus and method for 4-wheel driving vehicle

US5644488A · kind A · utility

Assignee

• MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA · JP

Inventors

• Yoshihito Ito · Okazaki, JP
• Hiroki Tuge · Frankfurt am Main, DE

Key dates

• Filing date: Apr 5, 1995
• Grant date: Jul 1, 1997
• Expiry date: Apr 5, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60K28/16
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

In a driving force control apparatus for a 4-wheel driving vehicle, a target driving torque is obtained based on a value determined by subtracting a feedback correction torque corresponding to a slip amount from a reference torque corresponding to a vehicle body speed. Slip is suppressed by a throttle control so that the engine output is reduced to the target driving torque. A retard command is output when the slip amount DVS and a slip rate GDVS are greater than predetermined values to control retarding of an ignition timing of the engine, thereby suppressing an abrupt slip. Further, the two greatest values of slip amounts of each of four wheels DVS.sub.1, DVS.sub.2, DVS.sub.3, and DVS.sub.4 are differentiated to determine slip rates GDVS.sub.1 and GDVS.sub.2, and the smaller of the slip rates GDVS.sub.1 and GDVS.sub.2 is used for control of ignition timing retarding. The apparatus causes a 4-wheel driving vehicle equipped with a limited slip differential (LSD) to provide a sufficient effect of the LSD and further suppresses the occurrence of an excessive slip.