Patent ID: 7174241

Claim:
A speedometer controller including: a vehicle wheel speed detection unit for detecting respective vehicle wheel speeds based on respective detection signals from wheel speed sensors equipped on a vehicle; a vehicle speed signal output unit for obtaining a vehicle speed, based on a detection result of the vehicle wheel speed detection unit, and outputting a signal for the vehicle speed, and a speedometer for displaying the vehicle speed, based on the signal for the vehicle speed; characterized in that the vehicle speed signal output unit comprises: a first calculation unit for calculating the vehicle speed by a first method depending on the detection result of the wheel speed detection unit, and a second calculation unit for calculating the vehicle speed by a second method, depending on the detection result of the wheel speed detection unit, and wherein a signal for the vehicle speed calculated by the first calculation unit is output prior to a predetermined timing while a signal for the vehicle speed calculated by the second calculation unit is output at and after the predetermined timing; and the vehicle speed signal output unit outputs the signals for the vehicle speed calculated by the second calculation unit after modifying the signals for the vehicle speed calculated by the second calculation unit in such a manner that a displayed vehicle speed that is displayed on the speedometer is changed gradually from the vehicle speed calculated by the first calculation unit to the vehicle speed calculated by the second calculation unit, in a case where a difference between the vehicle speed calculated by the first calculation unit and the vehicle speed calculated by the second calculation unit at the predetermined timing is larger than a predetermined value.