초록 ▼

A system and method for automatically running a vehicle at a desired cruising speed, in which a running resistance of the vehicle is always derived, a target opening angle of a throttle valve of a vehicular engine which can run the vehicle at a desired constant acceleration and/or at the desired cru

A system and method for automatically running a vehicle at a desired cruising speed, in which a running resistance of the vehicle is always derived, a target opening angle of a throttle valve of a vehicular engine which can run the vehicle at a desired constant acceleration and/or at the desired cruise running speed is derived under the derived running resistance, and the opening angle of the throttle valve is controlled in a feedforward control mode so as to coincide with the target opening angle. The automatic cruise running system and method can achieve no variation of vehicle speed when the vehicle runs on a rugged road.

대표청구항 ▼

A method for automatically running a vehicle at a desired cruising speed, comprising the steps of: (a) providing means for setting a desired cruise running speed; (b) determining whether the means sets the desired cruise running speed; (c) deriving a vehicle speed; (d) deriving an engine revolution

A method for automatically running a vehicle at a desired cruising speed, comprising the steps of: (a) providing means for setting a desired cruise running speed; (b) determining whether the means sets the desired cruise running speed; (c) deriving a vehicle speed; (d) deriving an engine revolution speed; (e) deriving an adjustment position of an engine speed adjusting mechanism of a vehicular engine; (f) deriving a gear shift position of a vehicle transmission; (g) deriving an engine torque; (h) deriving a running resistance of the vehicle; (i) deriving a target adjustment position of the engine speed adjusting mechanism so as to run the vehicle at the cruise running speed determined in the step (b) on the basis of the derived engine torque, engine revolution speed, gear position, and running resistance; (j) producing and outputting a vehicle speed control command on the basis of a difference between the target adjustment position of the engine speed adjusting mechanism derived in the step (h) and adjustment position of the engine speed adjusting mechanism derived in the step (e); and (k) actuating the engine speed adjusting mechanism to displace toward the target adjustment position in response to the vehicle speed control command.