Patent ID: 8320096
Filing Date: 2012-11-27
Classification: F16D

Abstract:
1. A controller for operating a range of electrically operated solenoid actuated clutches requiring different operating current comprising: a controllable power source coupled to the solenoid; a current sensor coupled to the solenoid, responsive to the current flowing in the solenoid and producing an output signal proportional to said current; a controller having a memory and coupled to the power source and the current sensor and responsive to the output signal for calculating a normalization factor based on the output signal and storing the normalization factor in the memory, increasing the current at a first rate, reducing the current to a second preselected current determined with reference to the normalization factor, increasing the current to a third preselected current based on the normalization factor at a second rate lower than the first rate, and then increasing the current at the first rate.