汽车蓄电池点火系的弱点和补偿方法
AA汽车蓄电池工作原理汽车蓄电池点火系的弱点和补偿方法
由于汽油压燃温度高,难于被压燃,因此汽油发动机设置了点火系,采用电火花点燃可燃混合气。
点火系的效用是将汽车电源供给的低压电转变为高压电,并按照发动机的作功顺序与点火时间的要求适时、准确地配送给各缸的火花塞,在其间隙处产生点火花,点燃气缸内的可燃混合气。
传统汽车点火系是指初级电路的通断由断电器触电节制的点火系,传统点火系的组成如下图所示。主要由电源、点火线圈、分电器、点火开关、火花塞、附加电阻、凹凸压导线等组成。
其中电源、 断电器和点火线圈的初级线圈构成低压电路部分;点火线圈的次级线圈、分电器和火花塞构成高压电路部分。
点火线圈是利用电磁感应原理制成的,点火线圈由初、次级线圈和铁芯组成,初级线圈的导线粗而匝数少,次级线圈导线细而匝数多,相当于一个升压变压器。点火线圈的效用是将电源提供的12V低压电转变成能击穿火花塞电极间隙的高压电。
断电器有机械式和结晶体管式两种,机械式的应用较普遍。当发动机运转时,凸轮轴驱动分电器中凸轮旋转,节制断电器触点启闭。当断电器将低压电路闭合时,初级线圈中即产生低压电流,在点火线圈内形成磁力场。当电流达到一定值时,断电器将低压电路断开,磁通消散,在次级线圈中感应出10~24千伏的电动势,通过分电器依次传到相应气缸的火花塞电极上,即产生电火花。
在点火开关和点火线圈之间的一次电路里接有一个热敏电阻或标准电阻丝(见图5.1所示)。它的效用使点火系统在不同发动机转速条件下都能有比较适合的电流输入,以保证获得最高的二次电压,而又不致严重影响点火线圈的生存的年限。
其事情情况是:在发动机转速较低时,触点闭合时间较长,一次电流易达到最大峰值电流,附加热敏电阻因发热温度升高而阻值增大,从而能有效地限制通过触点的一次电流,防止点火线圈过热。当发动机转速较高时,触点闭合时间较短,故而附加电阻温度较低,电阻值变小,使一次电流增大,这样就能保证较高转速时,一次电流不致减小许多。
点火线圈附加电阻一般用直径0.4mm左右的低碳钢丝、镍铬丝或纯镍丝。绕成螺旋管形,夹在两块磁板之间,用螺栓固定在点火线圈的安装连结架上,在常温20?C时,阻值一般为1.25~1.80Ω。附加电阻是热敏电阻,当电阻上流过的电流大,使温度升高时,其阻值随之变大;当电阻上流过的电流变小,使温度降低时,其阻值随之变小。
在起动机起动时,由于起动机事情电流很大,蓄电池端电压大幅度降落,一般由通常的12V降至8V,甚至更低。这是点火线圈的一次电流将成倍的减小,故而点火线圈不能供给足够的电压和点火能+量,导致点火困难。
通常为了改善点火性能,在起动时利用起动开关使附加电阻短路,以提高一次电流,保证发动机起动时靠得住点火。由于短路时间较短,故而不会降低点火线圈的使用生存的年限。但是在气温比较低的情况下,蓄电池的电流会减小,仍然会造成点火困难。
加装了整流器后,可以餍足起动机的开始工作瞬间的大电流需要,蓄电池的端电压电压降显著减小,火花塞的点火强度显著增强,提高了燃油的燃烧效率,所以您会感到开始工作更容易,还节约了宝贵的燃油。
网上看到的,觉得有道理,但不知道描述的情况是否属实?值得研究 WRC 发表于 2011-4-1 01:01 static/image/common/back.gif
网上看到的,觉得有道理,但不知道描述的情况是否属实?值得研究
这个不知道是不是老车的解决之道。。。gochinway50;) fissa 发表于 2011-4-1 16:08 static/image/common/back.gif
这个不知道是不是老车的解决之道。。。
It’s no secret that I and the rest of the MotorMavens Crew have a certain affinity for old school cars; especially cars from the 1960s and 1970s. When it comes to modifying a car from this era, I personally find it extremely important to retain the car’s old school look and personality. After all, the retro character is what I like most about a nostalgic car!
For those interested in making tasteful upgrades to their vintage vehicles in a period correct fashion, the ignition experts from MSD have released a limited edition retro redux version of their popular MSD 6AL ignition amplifier to celebrate the company’s 40th Anniversary! This 40th Anniversary 6AL amp features all the spark amplification power and features of their current 6AL model, but has the vintage MSD logo from 1970 on the outer casing. COOOOOOOOOOOOOOOOOOL.
Since I’m all about retaining the period correct style when making performance upgrades to my beloved 1973 TE27 Corolla SR-5, I just had to get one of these vintage MSD boxes for my car. My TE27′s factory 2TC pushrod engine has been swapped in favor of a Japanese domestic market 2TG twincam engine (Toyota’s 2TG engine is like the grandfather of the popular 4AG in AE86s), and built up by a close friend from Toyota Racing Development. It has been upgraded everything that TRD makes for the 2TG – race cams, oversized valves, dual valve springs, big bore pistons, rods, gear drive, you name it. The car hasn’t been tuned yet; it’s still sitting in the garage. I figured that right now would be the perfect time to upgrade the car’s ignition.
If you have a classic Toyota, Datsun, Mazda, Chevy, Ford, Volkswagen, BMW, or other vintage vehicle sitting in your garage, you absolutely must get one of these retro ignition amps. You better act quickly, though – there were only 4000 of these bad boys made, and I have number 3245. (In the voice of an old Chinese guy from a 1970s kung fu movie) Hurry up and buy!
不知道午器能胜任不~~~ 午器经我长期使用证明能够胜任,保护电瓶,增加启动电流。 小塘神马 发表于 2011-4-1 16:39 static/image/common/back.gif
不知道午器能胜任不~~~
午器就是整流器啊~~ fissa 发表于 2011-4-1 17:07 static/image/common/back.gif
午器就是整流器啊~~
对了,武器现在还有卖的吗? maxfree_gz 发表于 2011-4-1 22:59 static/image/common/back.gif
对了,武器现在还有卖的吗?
在啊,,gochinway52;) fissa 发表于 2011-4-1 17:07 static/image/common/back.gif
午器就是整流器啊~~
其实我用午器就是单纯想延长电池的寿命
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