| 摘要 |
In a glow plug energization controlling device which, not only at a time of starting but also at a time of driving, controls energization of a glow plug used in a preheating apparatus of a diesel engine, making it possible to utilize even low-cost, mass-produced products as the glow plug, and making it suffice not to switch the way of connection of the glow plug at the time of starting and at the time of driving. Using low-cost, mass-produced products for vehicles as a glow plug 5, these are connected in parallel. At the time of starting, battery 1 voltage is applied thereto and the glow plug 5 is heated. At the time of driving, on the basis of a detection signal from an engine speed sensor 11 or an exhaust temperature sensor 12, it is judged by a controller 7 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 20 is applied to the glow plug 5, 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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