Engine generator apparatus and cogeneration system
First Claim
1. An engine generator apparatus for interconnecting an output of a generator driven by an engine with a power system, comprising:
- an oxygen density sensor provided on the engine for controlling the air-fuel ratio based on its output;
a means for interconnecting the output of the power generator with the power system, when the oxygen density sensor becomes its activated state;
a fault detecting means for detecting a fault in the interconnection with the power system;
a means for canceling the interconnection with the power system when the fault detecting means detects a fault, and resuming the interconnection with the power system when the fault is removed; and
ameans for stopping the engine when the interconnection is canceled for a predetermined length of time due to the fault detection.
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Accused Products
Abstract
This can prevent declination in the operational efficiency due to the stop motion of an engine at the cancellation of the interconnection and minimize loads exerted on the startup device for the engine. A system protector 138 is provided for generating a fault signal when detecting a fault on the system source. Upon receiving the fault signal, an interconnection relay 135 is opened to cancel the interconnection and simultaneously, a timer 39 is started. The cancellation permits the engine 11 to run with no load. When the fault signal is maintained until the setting duration of the timer 39 is timed up, a time-out signal is released to stop the engine 11. On the other hand, when the fault signal is eliminated by canceling the cause of the fault before the setting duration of the timer 39 is passed, the interconnection relay 135 is closed to establish the interconnection again and the timer 39 is reset.
28 Citations
3 Claims
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1. An engine generator apparatus for interconnecting an output of a generator driven by an engine with a power system, comprising:
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an oxygen density sensor provided on the engine for controlling the air-fuel ratio based on its output;
a means for interconnecting the output of the power generator with the power system, when the oxygen density sensor becomes its activated state;
a fault detecting means for detecting a fault in the interconnection with the power system;
a means for canceling the interconnection with the power system when the fault detecting means detects a fault, and resuming the interconnection with the power system when the fault is removed; and
ameans for stopping the engine when the interconnection is canceled for a predetermined length of time due to the fault detection.
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2. A cogeneration system comprising:
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an engine generator apparatus for interconnecting an output of a generator driven by an engine with a power system, comprising;
an oxygen density sensor provided on the engine for controlling the air-fuel ratio based on its output;
a means for interconnecting the output of the power generator with the power system when the oxygen density sensor becomes its activated state;
a fault detecting means for detecting a fault in the interconnection with the power system;
a means for canceling the interconnection with the power system when the fault detecting means detects a fault, and resuming the interconnection with the power system when the fault is removed; and
a means for stopping the engine when the interconnection is canceled for a predetermined length of time due to the fault detection, a waste heat utilizing unit for utilizing waste heat produced by the operation of the engine generator apparatus, wherein the engine is started in response to a heat request generated by the waste heat utilizing unit. - View Dependent Claims (3)
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Specification