Preheating system for a diesel engine
First Claim
1. In a preheating system for a Diesel engine including a battery, an engine key switch adapted to receive an engine key, a glow relay means, a preheating plug supplied with an electric current from the battery through the glow relay means, and a charging switch means responsive to an engine operating parameter and coupled to said glow relay means for deenergizing said glow relay means when the charging switch means detects a starting of said engine, the improvement comprising an instantaneous glow switch closed in response to insertion of the engine key into the engine key switch, and a timer switch closed in response to a closing of said glow switch for exciting said glow relay means for a predetermined period of time after the closing of said glow switch.
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Abstract
A preheating system for a Diesel engine of a type including a preheating plug energized through a glow relay, and a charging switch for deenergizing the glow relay when the charging switch detects engine starting, the system comprises a glow switch adapted to be closed in response to insertion of an engine key into an engine key switch, and a timer switch for exciting the glow relay for pre-determined period of time after closing of the glow switch.
In accordance with a second embodiment, the preheating system further comprises a second glow switch, a glow plug preheating circuit established from the second glow switch through contacts of a self-holding relay to the glow plug, and circuitry for sensing overheating of the glow plug and in response interrupting the glow plug preheating circuit.
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Citations
20 Claims
- 1. In a preheating system for a Diesel engine including a battery, an engine key switch adapted to receive an engine key, a glow relay means, a preheating plug supplied with an electric current from the battery through the glow relay means, and a charging switch means responsive to an engine operating parameter and coupled to said glow relay means for deenergizing said glow relay means when the charging switch means detects a starting of said engine, the improvement comprising an instantaneous glow switch closed in response to insertion of the engine key into the engine key switch, and a timer switch closed in response to a closing of said glow switch for exciting said glow relay means for a predetermined period of time after the closing of said glow switch.
Specification