Stepper motor throttle controller

F - Mech Eng,Light,Heat,Weapons – 02 – D

Patent

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Details

F02D 41/14 (2006.01) F02D 11/10 (2006.01) F02D 31/00 (2006.01) F02D 35/00 (2006.01) F02D 41/24 (2006.01) F02B 1/04 (2006.01)

Patent

CA 2044569

A throttle controller for an internal combustion engine employs a stepper motor to move the throttle valve and provides a controller to permit the use of the stepper motor. The stepper motor requires no return spring or position sensor and hence offer weight and cost advantages. The throttle position is deduced by means of an up-down counter tracking movement of the stepper motor during throttle control. The controller includes an integration means to accommodate the unknown starting throttle position. A fuel cutoff solenoid is activated in the event of over-speed or power loss. An engine speed signal for the controller is produced by a variable reluctance sensor providing a signal to a slope detector circuit to eliminate the influence of external magnetic fields.

Commande de papillon pour moteur à combustion interne utilisant un moteur pas-à-pas pour actionner le papillon des gaz. Le moteur pas-à-pas ne requiert ni ressort de rappel ni capteur de position, ce qui se traduit par une économie en termes de poids et d'argent. La position du papillon est obtenue par déduction au moyen d'un compteur-décompteur qui suit les déplacements effectués par le moteur pas-à-pas pour actionner le papillon des gaz. La commande comporte un dispositif d'intégration pour tenir compte de la position de départ inconnue du papillon des gaz. Une solénoïde de ralenti est actionnée en cas de survitesse ou de perte de puissance. Un capteur à réluctance variable génère un signal de régime du moteur à un détecteur de pente afin d'éliminer l'influence des champs magnétiques extérieurs.

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