Circuitry for controlling the response time of electromagnetic devices with a solenoid
AssigneeRegie Nationale des Usines Renault
InventorJean-Pierre Rivere
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Abstract
A method for controlling the response time of an electromechanical device having an actuating solenoid comprising: applying three reference voltages from three reference voltage sources in a predetermined order to a voltage and current amplifier which drives the solenoid, generating from the three reference voltages three corresponding currents through the solenoid, the three currents being a premagnetization current, a maximum activation current of the solenoid and a deactivation current of the solenoid.
Claims6
A method for controlling the response time of an electromechanical device having an actuating solenoid comprising:
- applying three reference voltages from three reference voltage sources in a predetermined order to a voltage and current amplifier which drives the solenoid;
- generating from the three reference voltages three corresponding currents through the solenoid, the three currents being a premagnetization current, a maximum excitation current of the solenoid and a de-excitation current of the solenoid;
- sending the premagnetization current through the solenoid during a first phase;
- saturating a source of reference voltage located at the input of an integrator which transforms the constant voltage of the source into a voltage which increases linearly with time;
- applying the linearly increasing voltage to the voltage and current amplifier;
- sending a current which increases linearly to the maximum excitation current through the solenoid during a second phase;
- maintaining the maximum excitation current through the solenoid during a third phase;
- decreasing the current through the solenoid to a de-excitation value at the end of the third phase;
- maintaining the de-excitation current through the solenoid during a fourth phase;
- and
- reducing the current through the solenoid to zero during a fifth phase before the cycle is restarted by sending a premagnetization current through the solenoid.
A method for controlling the response time of an electromechanical device having an actuating solenoid comprising:
- applying three reference voltages from three reference voltage sources in a predetermined order to a voltage and current amplifier which drives the solenoid, said voltage and current amplifier including two transistors in a Darlington circuit, and each of said three reference voltage sources including a Zener diode connected to the input of the voltage and current amplifier through diodes forming an inclusive OR function and switchable in a predetermined order by an array of semiconductor-type switches;
- generating from the three reference voltages three corresponding currents through the solenoid, the three currents being a premagnetization current, a maximum excitation current of the solenoid and a de-excitation current of the solenoid;
- sending the premagnetization current through the solenoid during a first phase;
- sending a current which increases linearly to the maximum excitation current through the solenoid during a second phase;
- maintaining the maximum excitation current through the solenoid during a third phase;
- decreasing the current through the solenoid to a de-excitation value at the end of the third phase;
- maintaining the de-excitation current through the solenoid during a fourth phase;
- and
- reducing the current through the solenoid to zero during a fifth phase before the cycle is restarted by sending the premagnetization current through the solenoid.
Dependencies are inferred from the claim text.