Patent ID: 8680977

Claim:
An alarm system for a vehicle that performs an alarming braking operation by changing at least one of a drive power for driving a host vehicle and a braking force applied to the host vehicle when a probability of collision between the host vehicle and an obstacle is high, the alarming braking operation is configured to cause a driver to recognize that a collision may occur, the alarm system comprising: a collision probability index value calculation unit that calculates a collision probability index value corresponding to the probability of collision between the host vehicle and the obstacle; an acceleration detecting unit that detects an actual acceleration of the host vehicle; a target acceleration setting unit that is programmed to set a target acceleration, the target acceleration being determined based on an actual acceleration, the actual acceleration being detected by the acceleration detecting unit at the time when the collision probability index value reaches the predetermined threshold value, the target acceleration being maintained during the alarming braking operation so that an amount of change between the target acceleration and the actual acceleration when the collision probability index value reaches the predetermined threshold value becomes a predetermined value that is constant during the alarming braking operation; an acceleration control unit that controls at least one of the drive power for driving the host vehicle and the braking force applied to the host vehicle so that the target acceleration set by the target acceleration setting unit is achieved and maintained when the collision probability index value reaches a predetermined threshold value.