Method of controlling creep torque in motor driven vehicle
AssigneesHyundai Motor Company, Kia Motors Corporation
InventorJae Won Jung
Life of this patent
Estimating the term…
Abstract
A method of controlling creep torque in a motor driven vehicle is disclosed herein. In this method, a downhill gradient of a road is calculated. A filter time constant is calculated using the downhill gradient, a predetermined basic creep torque, a set speed and a compensation coefficient of the predetermined basic creep torque corresponding to the set speed. At a variable control step, the calculated filter time constant is applied to a filter, the predetermined basic creep torque is input to the filter, and a motor is controlled based on a torque value output from the filter as a request torque.
Claims9
A method of controlling creep torque in a motor driven vehicle, comprising:
- calculating a downhill gradient of a road;
- calculating a filter time constant using the downhill gradient and a predetermined basic creep torque;
- and
- a variable control step of applying the calculated filter time constant to a filter, inputting the predetermined basic creep torque to the filter, and controlling a motor of the motor driven vehicle based on a torque value output from the filter as a request torque,
- wherein the variable control step comprises:
- applying the calculated filter time constant to the filter;
- producing basic gradeability by multiplying the predetermined basic creep torque with a gear ratio divided by a radius of a tire;
- inputting the basic gradeability to the filter;
- and
- controlling the motor based on the required gradeability output from the filter.
Dependencies are inferred from the claim text.