Appliance controller
First Claim
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1. A controller for an appliance having a plurality of selectively energizeable electromechanical components, comprising:
- input means for operator selection of a desired cycle of operation of said appliance;
a motor;
switching means coupled to be driven by said motor and having a plurality of timing cams on a rotating member for controlling the operation of a plurality of switches for applying power to energize said components; and
sequencing means for selectively advancing said switching means including;
means for applying a power to said motor;
means for detecting an incremental movement of said rotating member;
means for operating said power applying means for a defined number of incremental movements of said rotating member;
means for timing a predetermined interval commencing with the actuation of said power applying means; and
means for stopping the operation of said power applying means in the event an incremental movement of said rotating member is not detected during said predetermined interval.
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Abstract
A microcomputer-based electronic controller for a dishwasher utilizes a motor driven timing cam for selectively energizing the electromechanical components of the dishwasher. An internal diagnostic routine in the microcomputer insures that the timing cam is advanced when the microcomputer calls for power to be applied to the motor.
31 Citations
9 Claims
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1. A controller for an appliance having a plurality of selectively energizeable electromechanical components, comprising:
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input means for operator selection of a desired cycle of operation of said appliance; a motor; switching means coupled to be driven by said motor and having a plurality of timing cams on a rotating member for controlling the operation of a plurality of switches for applying power to energize said components; and sequencing means for selectively advancing said switching means including; means for applying a power to said motor; means for detecting an incremental movement of said rotating member; means for operating said power applying means for a defined number of incremental movements of said rotating member; means for timing a predetermined interval commencing with the actuation of said power applying means; and means for stopping the operation of said power applying means in the event an incremental movement of said rotating member is not detected during said predetermined interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A controller for an appliance having a plurality of selectively energizeable electromechanical components, comprising:
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input means for operator selection of a desired cycle of operation of said appliance; a motor; switching means coupled to be driven by said motor and having a plurality of timing cams on a rotating member for controlling the operation of a plurality of switches for applying power to energize said components; and sequencing means for selectively advancing said switching means including; means for applying power to said motor; means for detecting an incremental movement of said rotating member including; a cam track on said rotating member including a plurality of spaced teeth; a cam follower associated with said cam track; and switching means coupled to said cam follower for providing a first circuit condition when said cam follower is in contact with one of the tips of said teeth and providing a second circuit condition when said cam follower is in contact with one of the roots of said teeth; means for operating said power applying means for a defined number of incremental movements of said rotating member; and means for defining a home position of said rotating member.
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Specification