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Polyvinyl chloride (PVC) is used as insulation for automotive wiring. However, when the wiring is scrapped, there is some apprehension that hydrogen chloride gases may be generated and cause environmental pollution. To prevent further environmental pollution and to promote the recycling of materials, wire with non-halogenated insulation has been recently developed for automotive use. This insulation material has excellent mechanical and heat resistant properties. The newly non-halogenated insulated automotive wiring satisfies all the properties required for the existing PVC insulated automotive wiring. Furthermore, the new automotive wiring is environmentally friendly with no generation of smoke or harmful materials when incinerated or buried in landfills.

The aim of this study was to clarify the feasibility of applying ion current measurement to detect knock and misfire in lean-burn gas engines. The practical applicability was evaluated by conducting a basic test on a small engine and a test on a large engine. The tests were conducted by advancing the ignition timing to cause knocking, and an evaluation was carried out by comparing the knocking intensity detected by ion current signals and by cylinder pressure signals. By increasing the application voltage and including an amplifier circuit, the weak ion current signals were detected, which indicates that it should be possible to use ion current measurement to detect knock and misfire in lean-burn gas engines.