Researches on knock combustion in BJ492Q using spark plug optical sensors are presented in this paper. The effects of knock intensity on light emission are studied.

应用火花塞光纤传感测量系统对BJ 492 Q汽油机爆燃燃烧进行测量和研究，分析了爆燃燃烧时火焰光辐射的变化情况。

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When worked in non-knock conditions, the most optimum spark angle is the adder of the initial spark angle, the basic ignition angle and the amendment spark angle.

发动机在非爆震区域工况下，其最佳点火提前角为初始点火提前角、基本点火提前角和修正点火提前角之和。

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In knock regions, the most optimum spark Angle is the adder of the basic spark Angle, the knock amendment Angle and other amendments.

爆震区最佳点火提前角为基本点火提前角、爆震修正和其他修正之和。

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Mr Daniels, in Indiana, has proposed a similar measure, although he opposes a move by the state legislature to allow employees in any unionised workplace to opt out of paying union dues, as Mr Walker also proposes, for fear it will spark a knock-down drag-out fight with the labour movement.

ECONOMIST: Taking on the public-sector unions