Patent ID: 8423254

Claim:
A deceleration device for a vehicle, comprising: a recognizing section for recognizing the driving environment including a preceding vehicle; a first target deceleration calculating section operatively configured to obtain a first target deceleration depending on the recognized driving environment; a second target deceleration calculating section operatively configured to obtain a predetermined second target deceleration at a condition that the recognizing section detects no preceding vehicle ahead of the vehicle; a deceleration calculating section operatively configured to selectively output one of the first target deceleration from the first target deceleration calculating section and the second target deceleration from the second target deceleration calculating section, such that when the recognizing section detects the preceding vehicle in a state that the second target deceleration calculating section is in operation, the first target deceleration calculating section is made to be in operation to output the first target deceleration, and when the recognizing section detects no preceding vehicle in a state that the first target deceleration calculating section is in operation, the second target deceleration calculating section is made to be in operation to output the second target deceleration; and a vehicle speed controlling section which generates a brake-fluid pressure signal for controlling the deceleration of the vehicle on the basis of one of the first target deceleration and the second target deceleration output from the deceleration calculating section, wherein the second target deceleration output from the second target deceleration calculating section is set to a predetermined value when the vehicle speed of the vehicle is net lower than a predetermined threshold value, and set to zero when the vehicle speed of the vehicle is not lower than the predetermined threshold value.