초록 ▼

An anti-skid brake control system is associated with a control system for a power train which controls power train operation mode between a four-wheel drive mode, in which all four wheels are coupled with an automotive internal combustion engine to be distributed torque according to a controlled dis

An anti-skid brake control system is associated with a control system for a power train which controls power train operation mode between a four-wheel drive mode, in which all four wheels are coupled with an automotive internal combustion engine to be distributed torque according to a controlled distribution ratio of an engine driving torque, and a two-wheel drive mode, in which two auxiliary driving wheels are disconnected from the engine to be free from engine driving torque and two driving wheels are connected to the engine to receive the engine driving torque. The anti-skid brake control system is so associated with the power train control system as to normally set the power train operation mode into the two-wheel drive mode during active state of anti-skid brake control, and to set the power train operation mode into the four-wheel driven mode in response to wheel slippage at the primary driving wheels greater than a predetermined threshold value.

대표청구항 ▼

A combination comprising: a power train control system associated with an automotive internal combustion engine for distributing driving torque generated by said engine to primary driving wheels which are permanently coupled with said engine and auxiliary driving wheels which are disconnectably coup

A combination comprising: a power train control system associated with an automotive internal combustion engine for distributing driving torque generated by said engine to primary driving wheels which are permanently coupled with said engine and auxiliary driving wheels which are disconnectably coupled with said engine, said power train control system being operative between a two-wheel drive mode for distributing driving torque only to said primary wheels and a four-wheel drive mode for distributing driving torque to all of said primary and auxiliary wheels; an anti-skid brake control system for controlling braking pressure for maintaining wheel slippage in the vicinity of a predetermined optimum level, said anti-skid control system comprising: a plurality of wheel cylinders; a braking circuit connecting a pressurized fluid source to a respective wheel cylinder of said plurality of wheel cylinders for each of said primary and auxiliary wheels for building up braking pressure in the latter; a plurality of pressure control valve means, each disposed in said braking circuit, for controlling braking pressure in an associated one of said wheel cylinders, each of said pressure control valve means being operable for increasing braking pressure in said associated one of said wheel cylinders in a first mode and for decreasing braking pressure in said associated one of said wheel cylinders in a second mode; a plurality of first sensors, each monitoring rotation speed of an associated one of said primary and auxiliary wheels for producing a wheel speed indicative signal; second means for deriving wheel slippage on the basis of said wheel speed indicative signal and producing wheel slippage data with respect to each of said wheels; third means for producing a first control signal for controlling an operation mode of each of said pressure control valve means independently of other ones of said valve means for switching said operation mode between said first and second mode in order to maintain wheel slippage at each wheel in the vicinity of said predetermined optimum value, on the basis of said wheel slippage data; and fourth means, active while said third means is active, for detecting wheel slippage at said primary wheels which is greater than a predetermined wheel slippage criterion for producing a second control signal for controlling said power train control system to set said operation mode at said four-wheel drive mode.