US 11,807,290 B2
Systems and methods of improved speed regulation for power rake columns
James E. Rouleau, Burt, MI (US); and Edward A. Cana, Clio, MI (US)
Assigned to Steering Solutions IP Holding Corporation, Saginaw, MI (US)
Filed by Steering Solutions IP Holding Corporation, Saginaw, MI (US)
Filed on Mar. 23, 2020, as Appl. No. 16/826,749.
Prior Publication US 2021/0291894 A1, Sep. 23, 2021
Int. Cl. B62D 1/181 (2006.01); B62D 15/02 (2006.01); H02P 6/24 (2006.01); B62D 5/04 (2006.01)
CPC B62D 1/181 (2013.01) [B62D 15/0215 (2013.01); H02P 6/24 (2013.01); B62D 5/046 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An apparatus for controlling an electric machine, the apparatus comprising:
processing circuit; and
a memory that includes instructions that, when executed by the processing circuitry, cause the processing circuitry to:
in response to receiving a command signal:
determine a position of a steering column;
determine a desired direction of the steering column based on the command signal;
determine a voltage corresponding to a system voltage supplied to the electric machine to move the steering column;
determine a duty cycle of a pulse width modulated signal based on a function of a rake angle of the steering column, the desired direction of the steering column, and the system voltage;
apply the pulse width modulated signal to the electric machine to change the position of the steering column; and
while applying the pulse width modulated signal to change the position of the steering column, selectively adjust the duty cycle of the pulse width modulated signal in response to changes in the system voltage and changes in the rake angle to maintain a constant speed of adjustment of the steering column.