六、三元催化转换器

The three way catalytic converter contains precious metals that serve as catalysts，promoting chemical reactions to convert the exhaust gasses without aftecting the metals.The catalytic converter is referres to as a three-way catalyst，since it acts on HC，CO and NOx.

The three way catalytic converter must operate at a high temperature for the chemical reactions to take place.It can set on fire any combustible materials that come near it.Park your car away from high grass，dry leaves，or other flammables.

A defective three way catalytic converter contributes to air pollution，and can impair your engine’s per-formance.Follow these guidelines to protect your car’s three way catalytic converter.

1.Always use unleaded petrol.Even a small amount of leaded petrol can contaminate the catalyst metals，making the three way catalytic converter ineffective.

2.Keep the engine tuned-up.

3.Have your car diagnosed and repaired if it is misfiring，back-firing，stalling，or otherwise not running properly.

【译文】

三元催化转换器以各种贵金属作为催化剂，在不影响金属的前提下，利用化学反应来转换废气的成分。催化转换器以三元催化转换器为代表，因为它能对废气中的HC、CO和NOx起氧化还原反应。

三元催化转换器必须在高温环境下才能发生化学反应，可使其附近的任何可燃物质燃烧。应避免把您的车辆停放在有草丛、枯叶或其他易燃性物体的场所。

不合格的三元催化转换器将会影响到大气污染和降低发动机的性能。应遵守下列措施保护您车辆的三元催化转换器。

1.必须使用无铅汽油。即使是低含铅汽油也会污染催化金属，降低三元催化转换器的效果。

2.保持发动机的转速。

3.在发生点火不良、进气管回火、失速或其他不能正常运转的现象时，应及时诊断、维修。