CONTROL APPARATUS FOR PREVENTING ROLLING BACK OF AN ELECTRICALLY DRIVEN VEHICLE UPON START-UP THEREOF
First Claim
1. A rollback prevention control device for an electrically driven vehicle capable of traveling by transmitting driving force from a rotation electric machine to wheels with the wheels being braked by regenerative braking by a load associated with electric generation of the rotation electric machine and a frictional braking on an as required basis, comprising:
- a charging restriction detecting unit that detects that charging to the rotation electric machine is being restricted;
a starting operation detecting unit that detects a starting operation of a driver of the electrically driven vehicle;
a vehicle rollback detecting unit that detects if the vehicle rolls back in a direction opposite to a starting direction when the starting detecting unit has detected the starting operation; and
a frictional braking control unit that causes the frictional braking to occur and to control a frictional braking force to a braking force in accordance with the starting operation when the starting detecting unit and the vehicle rollback detecting unit detect the vehicle rollback at the starting operation and the charging restriction unit detects restriction of a charging operation.
1 Assignment
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Accused Products
Abstract
In an electrically driven vehicle propelled by an electric machine (motor)equipped with a collaborative braking system of regenerative and frictional braking capacities, in order to achieve the “rollback prevention” at starting on an sloping road, when the regenerative braking is not available due to charging restriction to battery, frictional braking is used instead of regenerative braking and wheels are (automatically, i.e. not manually by driver) braked with friction to prevent the rollback. Moreover, in addition to braking wheels by frictional braking, further control is performed to adjust and match the magnitude of frictional braking force to a braking force in accordance with the starting operation. Thus, at the time of rollback prevention by the frictional braking as well, the similar prevention of rollback will be possible as the prevention by way of regenerative braking such that the effect of rollback prevention may be achieved without a feel of discomfort.
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Citations
7 Claims
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1. A rollback prevention control device for an electrically driven vehicle capable of traveling by transmitting driving force from a rotation electric machine to wheels with the wheels being braked by regenerative braking by a load associated with electric generation of the rotation electric machine and a frictional braking on an as required basis, comprising:
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a charging restriction detecting unit that detects that charging to the rotation electric machine is being restricted; a starting operation detecting unit that detects a starting operation of a driver of the electrically driven vehicle; a vehicle rollback detecting unit that detects if the vehicle rolls back in a direction opposite to a starting direction when the starting detecting unit has detected the starting operation; and a frictional braking control unit that causes the frictional braking to occur and to control a frictional braking force to a braking force in accordance with the starting operation when the starting detecting unit and the vehicle rollback detecting unit detect the vehicle rollback at the starting operation and the charging restriction unit detects restriction of a charging operation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification