| 摘要 |
<P>PROBLEM TO BE SOLVED: To prevent occurrence of a shortage of slowdown speed due to a deviation between regenerative braking and frictional braking that is caused by a delay in response for the command value of the frictional braking when switching from the regenerative braking to the frictional braking. <P>SOLUTION: The following describes when master cylinder hydraulic pressure Pmc is generated by treading a brake pedal at t1 and the vehicle speed VSP decreases as shown. Regenerative braking torque is used until the moment t2, during the period of a high speed area with vehicle speed Vlmth or more at the start of a regenerative braking control performing the regenerative braking accurately, and a command value Tmcom2 for regenerative braking torque is decreased in a second order curve as shown in solid line as the speed VSP decreases when the speed VSP becomes less than Vlmths, and then the target braking torque for the vehicle is achieved by the increase of the command value Pbcomf for brake hydraulic pressure (frictional braking torque). Since the total target braking torque is a sum of values of Tmcom2 and Pbcomf, Pbcomf is also increased in the second order curve. Accordingly a deviation between the two types would not widen even because of a delay in response for the command value for the frictional braking, and that diminishies a temporal shortage of the slowdown speed due to the deviation and allows a smooth transition from the regenerative braking to the frictional braking. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
