Diesel engine shutoff actuator

• US 4,328,773 A
• Filed: 09/02/1980
• Issued: 05/11/1982
• Est. Priority Date: 09/02/1980
• Status: Expired due to Term

• Current Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Woodward, Ronald O.
• Primary Examiner(s): Lazarus, Ira S.
• Application Number:
  US06/183,103
• Time in Patent Office: 616 Days
• Field of Search: 123/198 D, 123/198 DB, 123/179 L, 123/179 G, 123/366, 123/DIG. 11
• US Class Current: 123/198.0DB
• CPC Class Codes: F02B 3/06 with compression ignition compression ignition engines using air or gas for blowing fuel into compressed air in cylinder F02B13/02
• CPC Class Codes: F02D 17/04 rendering engines inoperative or idling, e.g. caused by abnormal conditions dependent on lubricating conditions F01M1/22; dependent on cooling F01P5/14

Abstract

An actuator is provided to selectively turn a diesel engine governor shutoff shaft to fuel "off" or fuel "on" position in response to keyswitch operation. An electric motor coupled through a gear train to a shutoff lever turns the lever to "on" or "off" position. A relay circuit controls the motor operation in response to keyswitch position and shutoff lever position. A feedback element moving with the shutoff lever mechanically interrupts the relay circuit by overriding the relay contact state to turn off the motor whenever the shutoff lever reaches an "on" or "off" position.

Claims

1. A diesel engine shutoff actuator for effecting cutoff of fuel in response to keyswitch operation to "off" position and fuel turn-on in response to keyswitch operation to "on" position comprising

a fuel control element mounted for movement between a fuel "on" and a fuel "off" position,

a reversible electric motor drivingly connected to the control element for moving the element from one position to another,

a pair of relays each having a switch connected to the motor and a coil connected to the keyswitch for energization to thereby establish relay energization and motor direction state according to keyswitch position,

a control circuit including the said relay switches for energizing the motor and determining its direction of rotation according to the energization states of the relays, whereby motor operation in the proper direction can be initiated to drive the control element from one position toward the other position, and

a mechanical feedback member coupled to the relay switches and the control element for movement thereby to selectively operate the relay switches as limit switches at the control element "on" and "off" positions respectively to de-energize the motor.

2. A diesel engine shutoff actuator for effecting cutoff of fuel in response to keyswitch operation to "off" position and fuel turn-on in response to keyswitch operation to "on" position comprising

a fuel control element mounted for movement between a fuel "on" and a fuel "off" position,

a reversible electric motor drivingly connected to the control element for moving the element from one position to another,

a pair of relays each having a switch connected to the motor and a coil connected to the keyswitch for energization to thereby establish relay energization state according to keyswitch position,

a control circuit including the said relay switches for energizing the motor and determining its direction of rotation according to the energization states of the relays, wherby motor operation in the proper direction can be initiated to drive the control element from one position toward the other position, and

a mechanical feedback member connected to the control element for movement thereby and selectively engaging the relay switches at the control element "on" and "off" positions respectively for operating a selected relay switch contrary to the state of relay coil energization to de-energize the motor when the control element reaches the said other position.

3. A diesel engine shutoff actuator for effecting cutoff of fuel in response to keyswitch operation to "off" position and fuel turn-on in response to keyswitch operation to "on" position comprising

a fuel control element mounted for movement between a fuel "on" and a fuel "off" position,

a reversible electric motor drivingly connected to the control element for moving the element from one position to another,

a pair of relays having coils connected in parallel to the keyswitch for concurrent energization to thereby establish relay energization state according to keyswitch position, and switches connected to the motor, the switches each movable between a first and a second state corresponding to the state of its coil energization,

a control circuit including the said relay switches for energizing the motor and determining its direction of rotation according to the energization states of the relays, the motor being rotated in a direction to drive the control element to fuel "on" position when both relay switches are in their first stae, in the other direction when both relay switches are in their second state, and stopped when the relay switches are in different states, and

a mechanical feedback member connected to the control element for movement thereby and effective when the control element is moved from one position to the other position to selectively engage the relay switches at the control element "on" and "off" positions respectively for changing the state of a selected relay switch contrary to its state of relay coil energization to de-energize the motor when the control element reaches the said other position.