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2021
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The main output pressure source of the vacuum pump output.
The working principle of a car vacuum pump is that, for vehicles equipped with gasoline engines, the engine generally uses a spark ignition system, which can generate a relatively large vacuum pressure at the intake manifold. This can provide sufficient vacuum source for the vacuum-assisted braking system. However, for vehicles driven by diesel engines, since their engines use compression ignition, they cannot provide the same level of vacuum pressure at the intake manifold. Therefore, a vacuum pump that can provide a vacuum source is needed. Additionally, engines designed to meet certain automotive emission and environmental requirements also require it to provide sufficient vacuum source to ensure the vehicle operates normally. The vacuum pump mainly outputs pressure generated by the power servo system, but when it cannot function properly, the hydraulic system can still be driven manually to provide assistance. The vacuum braking assist system can also be referred to as the vacuum servo system. The automotive braking system commonly used relies mainly on hydraulics as the transmission medium, and compared to a pneumatic braking system that can provide power, it requires a resistance system to assist the driver's braking. The car vacuum pump mainly utilizes the vacuum generated when the engine is running to provide sufficient assistance when the driver steps on the brake, making it easier for the driver to brake. However, once the vacuum pump is damaged, it lacks a certain level of assistance, making the brake feel heavier when pressed. Additionally, the braking effect will also decrease, and sometimes it may even fail, indicating that the vacuum pump has been damaged.
汽车真空泵工作原理，首先装有汽油发动机的车子，一般发动机是使用了点燃式，所以在进气支管的时候就可以产生比较大的真空压力。这样就能够为真空助力制动系统来提供足够的真空来源，但是对于柴油发动机驱动的车辆来说，因为它的发动机是使用了压燃式，所以在进气的支管处是不能够提供同等水平的真空压力的，这就需要用到可以提供真空来源的真空泵了，另外还有车辆为了达到一定的汽车排放环保要求而设计出来的发动机，也是需要它来提供足够的真空来源，以保证车子能够正常运行。
真空泵输出的主要是动力伺服系统产生的压力，但是在它不能正常工作的时候，仍然可以由人力来驱动液压系统，起到助力的作用。而真空制动的助力系统，也可以叫它真空伺服系统。平时所用的汽车制动系统，一般的时候主要都是依靠液压来作为传动的媒介，然后与可以提供动力的气压制动的系统相比较的话，它是需要一个阻力系统来对驾驶员的制动来提供辅助。
汽车真空泵主要是利用了发动机在工作的时候产生的真空，再为司机踩刹车的时候提供足够的助力，让司机在踩下刹车时会比较轻快好使，但是一旦真空泵发生损坏的时候，就缺乏了一定的助力，所以在踩刹车的时候会感觉比较的沉重，另外刹车的效果也会降低，有时候甚至会失灵，这就表示真空泵发生损坏了。
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