分電盤點火與電子點火技術(shù)解析 Distributor ignition and electronic ignition-

1、分電盤點火與電子點火技術(shù)解析Distributor ignition and electronic ignitionDistributor is mechanically controlled ignition timing of each cylinder, which has a rotor in electric disk rotating, the rotating shaft is driven by the engine and speed is the engine crankshaft speed 1/2, contact is connected to the cylinde

2、r spark plug are sequentially arranged around the distributor. When the rotor in electric plate to rotate, can sequentially make each cylinder contact trigger current conduction, and through the high-voltage wire electric transmission to the spark plug, the ignition.Distributor will have an inertia

3、flywheel group spring to control the rotation speed of the engine with theignition advance angle on different disk, also has the vacuum mechanism with varying engine load to control the ignition advance angle. Nevertheless, because the ignition advance angle control points of the pad are mechanical,

4、 in engine technology, still can not be accurate, but the costs of, also have a few below 2000c.c. engine using distributor ignition.Although reliable mechanical components, but used for engine control system electronic components more accurately if the total does not. In the increasingly stringent

5、environmental regulations and consumer on the performance of attention, the car factory have adopted electronic ignition system, and other electronic control system. Electronic ignition is every two cylinder or acylinder is composed of a high voltage ignition coil and responsible, by ECU on individu

6、al ignition coil ignition signal issued, the ignition advance angle is derived by the ECU according to engine operating conditions to calculate according to engine operation, flexible adjustment; if equipped with a knock sensor for the engine, ECU can also directly as the angle of ignition advance o

7、r delayed action on a cylinder. So, knock sensor can only be installed in an electronic ignition engine, because the advance angle of ignition distributor is not controlled by ECU.分電盤是以機械方式控制各缸的點火時機,其中有一轉(zhuǎn)子在分電盤中旋轉(zhuǎn),其旋轉(zhuǎn)軸是由引擎帶動并且轉(zhuǎn)速是引擎曲軸轉(zhuǎn)速的二分之一,連接至各缸火星塞的接點則依序設(shè)置在分電盤四周。當(dāng)轉(zhuǎn)子在分電盤中旋轉(zhuǎn)時,會依序使各缸接點之觸發(fā)電流導(dǎo)通,并藉高壓導(dǎo)線將電傳

8、送至火星塞,使火星塞點火。分電盤上會有一個慣性彈簧-飛輪組來控制隨著引擎轉(zhuǎn)速不同之點火提前角,也有真空機構(gòu)隨著不同的引擎負荷來控制點火提前角。雖然如此,因為分墊盤的點火提前角控制皆為機械式,以引擎科技而言,還是無法稱得上精確,但是因成本關(guān)系,也有少數(shù)2000c.c.以下的引擎采用分電盤點火。機械組件雖然可靠,但用來作引擎系統(tǒng)的控制總不若電子組件來得精確。在環(huán)保法規(guī)的日益嚴苛及消費者對性能的重視,各家車廠紛紛采用電子點火系統(tǒng),及其它電子控制系統(tǒng)。電子點火是每兩缸或每一缸由一個高壓點火線圈負責(zé),由ECU個別對點火線圈下達點火訊號,其點火提前角是由ECU依據(jù)引擎運轉(zhuǎn)狀況計算而得,可依據(jù)引擎運轉(zhuǎn)作靈活

9、的調(diào)整;若配備有爆震感知器的引擎,ECU也能直接對某缸作點火角提前或延后的動作。所以,爆震感知器只能裝設(shè)在有電子點火的引擎上,因為分電盤的點火提前角是不受ECU控制的。due to the distance of the valve and camshaft, valve tappet and lifter andother auxiliary parts, cause the valve drive more, complicated structure, engine size is big, and under high-speed operation is easy to genera

10、te noise, while adopting the overhead camshaft can change this phenomenon.So, the modern car engine is generally adopted overhead camshaft, configure the camshaft is at the top of the engine, shorten the distance between the camshaft and valve, valve tappet and lifter is omitted, simplifies the cams

11、haft between valve and actuator, the engine structure become more compact.And, more importantly, this kind of installation method can reduce the quality of the reciprocating motion, the whole system to improve the transmission efficiency.According to the number of the camshaft, can be divided into s

12、ingle overhead camshaft (SOHC and double overhead camshaft (DOHC two kinds, as in high-grade car engine is generally more valve and v-shaped cylinder arrangement, need to adopt double camshaft control into the exhaust valve respectively, so the double overhead camshaft been adopted by many famous-brand engines. 發(fā)動機的凸輪軸安裝位置有下置、中 置、頂置三種形式。轎車發(fā)動機由于 轉(zhuǎn)