Abstract: A vehicle speed control device calculates a desired axle torque for maintaining a speed of a vehicle to a set speed, and conducts cruise control. Specifically, the vehicle speed control device calculates a drive force including a feedforward component corresponding to the set speed and a travel resistance against the travel of the vehicle, and a feedback component corresponding to a deviation of the set speed from the actual speed of the vehicle as a desired axle torque. The vehicle speed control device interrupts the cruise control when a requested drive axle torque requested by an accelerator operation during the cruise control exceeds the desired axle torque, and restarts the cruise control when the requested drive axle torque becomes lower than the desired axle torque.

Abstract: A vehicle speed control system starts an automatic decelerating operation with a maximum permissible decelerating physical amount “Gmax”, when an electronic control unit determines that a necessary decelerating physical amount for decreasing a vehicle speed “v” to a target vehicle speed “vt” at a curve starting point becomes larger than the maximum permissible decelerating physical amount “Gmax”. The vehicle speed control system terminates the automatic decelerating operation, when required decelerating physical amount by a braking operation during the automatic decelerating operation becomes larger than an actual control decelerating physical amount for the automatic decelerating operation.

Abstract: A vehicle automatic operation control device includes a target required torque calculating part (31) which determines the target required torque from the respective calculated values of a feed-forward calculated value and a feedback calculated value, and an automatic operation control part D which causes the vehicle to operate automatically on the basis of the determined target required torque, and which performs slip suppression control that suppresses slip of the wheels when any of the wheels of the vehicle slip. In cases where slip suppression control is performed by the automatic operation control part (D), the target required torque calculating part (31) holds the feedback calculated value based on the deviation between the target acceleration and actual acceleration, and determines the target required torque from the respective calculated values of the held feedback calculated value and feed-forward calculated value.

Abstract: An estimated gradient value of a road is calculated based on a vehicle acceleration “A” and a time varying portion “A?” of a wheel speed. In a case that an acceleration corresponding value “Ggrad0” for the estimated gradient value is not regarded as indicating an exact figure, due to influences of disturbances, the acceleration corresponding value “Ggrad0” is corrected by a limiting value for rate-of-change with regard to the road gradient depending on respective vehicle speed, and by a limiting value for the road gradient. As a result, the acceleration corresponding value “Ggrad” for the estimated gradient value can be more exactly obtained.

Abstract: It is an object of the present invention to provide a vehicle automatic operation control device that can perform automatic operation of a vehicle while the actual acceleration favorably tracks the target acceleration. The device comprises a target required torque calculating part (31) which determines the target required torque from the respective calculated values of a feed-forward calculated value and a feedback calculated value, and an automatic operation control part D which causes the vehicle to operate automatically on the basis of the determined target required torque, and which performs slip suppression control that suppresses slip of the wheels when any of the wheels of the vehicle slip.

Abstract: A vehicle speed control device calculates a desired axle torque for maintaining a speed of a vehicle to a set speed, and conducts cruise control. Specifically, the vehicle speed control device calculates a drive force including a feedforward component corresponding to the set speed and a travel resistance against the travel of the vehicle, and a feedback component corresponding to a deviation of the set speed from the actual speed of the vehicle as a desired axle torque. The vehicle speed control device interrupts the cruise control when a requested drive axle torque requested by an accelerator operation during the cruise control exceeds the desired axle torque, and restarts the cruise control when the requested drive axle torque becomes lower than the desired axle torque.

Abstract: An estimated gradient value of a road is calculated based on a vehicle acceleration “A” and a time varying portion “A?” of a wheel speed. In a case that an acceleration corresponding value “Ggrad0” for the estimated gradient value is not regarded as indicating an exact figure, due to influences of disturbances, the acceleration corresponding value “Ggrad0” is corrected by a limiting value for rate-of-change with regard to the road gradient depending on respective vehicle speed, and by a limiting value for the road gradient. As a result, the acceleration corresponding value “Ggrad” for the estimated gradient value can be more exactly obtained.

Abstract: A vehicle speed control system starts an automatic decelerating operation with a maximum permissible decelerating physical amount “Gmax”, when an electronic control unit determines that a necessary decelerating physical amount for decreasing a vehicle speed “v” to a target vehicle speed “vt” at a curve starting point becomes larger than the maximum permissible decelerating physical amount “Gmax”. The vehicle speed control system terminates the automatic decelerating operation, when required decelerating physical amount by a braking operation during the automatic decelerating operation becomes larger than an actual control decelerating physical amount for the automatic decelerating operation.