VEHICLE SPEED ESTIMATION METHOD AND VEHICLE SPEED ESTIMATION DEVICE FOR FOUR-WHEEL DRIVE VEHICLE

• Main Authors: NAKAJIMA YUUKI, NISHIHASHI NAOSHI
• Format: Patent
• Language: Chinese; English
• Published: 30.07.2021
• Subjects: ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE ORDIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; PERFORMING OPERATIONS; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OFVEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TOTHE CONTROL OF A PARTICULAR SUB-UNIT; TRANSPORTING; VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES; VEHICLES IN GENERAL

If the sign of the driving torque applied to a wheel 1 is reversed and the absolute value difference between at least two of the wheel speeds from among each of the wheel speeds becomes smaller than a threshold epsilon, an ECU3 switches the wheel speed selection mode used for estimating the vehicle speed between a select-low mode and a select-high mode. 在对车轮(1)施加的驱动转矩的符号反转的情况下，在各车轮速度中的至少2个车轮速度的绝对值差值小于阈值(ε)时，ECU(3)在选择低速和选择高速之间对用于车身速度的推定的车轮速度的选择方法进行切换。