| 摘要 |
Glow plugs are connected in parallel. At the time of starting, a battery voltage is applied thereto and the glow plugs are heated. At the time of driving, on the basis of a detection signal from an engine speed sensor or an exhaust temperature sensor, it is judged by a controller whether or not the engine is in a poor combustion state. When it is judged that the engine is in a poor combustion state, neutral point N voltage (about half of the battery voltage) of an alternator is applied to the glow plug, and temperature of a combustion chamber is raised. Because there is no need to series/parallel switch-connect the glow plug, the circuit structure is simple.
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