The technological secrets of the vacuum-assisted pump core: how to achieve precision brakes
In a modern car brake system, the vacuum booster pump, as a core component, has the key task of magnifying the driver's pedal 5-10 times. This technology not only improves the economy and precision of the brake process, but also significantly enhances vehicle safety. This paper will analyse the technical logic of vacuum-assisted pumps in a systematic manner from the four dimensions of structural composition, core principles, dynamic regulation mechanisms and typical application scenarios。
Structure composition: co-design of precision machinery and pressure control
The vacuum booster pump consists of two main systems, the mechanical structure and the air pressure control module, and each component achieves functional closure through precision。
Mechanical structural systems pressure control module core principles: pressure differential driven mechanical magnification mechanism
The vacuum booster pump is essentially a pressure differential driven mechanical amplifier, which can be divided into four stages:
Non-stop state: control valves keep vacuum valves open, air valves closed, vacuum cavities connected to atmospheric cavities via valves, both of which are -60kpa (relative atmospheric pressure). The film is in a balanced position with feedback springs, and the pusher moves unplaced. (c) initial step-down of the pedal: when the pedal reaches 5 mm, the thruster pushes the control valve to close the vacuum valve while opening the air valve. The atmosphere enters the cavity at a current rate of 0. 5 m/s and the pressure rises instantaneously to 101 kpa. At this point, the vacuum cavity remained -60kpa, creating 161kpa pressure differentials. The membrane moves 8 mm forward with pressure differentials and pushers generate 120 n initial thrusts. The contribution of this stage is up to 6:1, i. E., the driver can export 120 n with 20 n. Sustained brake phase: control valve openings increased to 3 mm2 and atmospheric inflow to 0. 8 m3/h as the pedal process deepened to 15 mm. Vacuum cavity pressure slowly rises to -50 kpa and the pressure is stable at 151 kpa. The membrane shift is linear with the pedal trip, with 1. 2 mm before the film and a 15n push. The force ratio at this stage is maintained at 5:1 to ensure control of power levels. Unlock the pedal phase: the pedal returns the pedal to its initial position (cord factor 8n/mm) and the control valve returns to the feedback spring. Air valves are closed, vacuum valves are opened, and atmospheric cavities are slowly discharged through a 3 mm throttle. The membrane returns to balance position in 0. 3 seconds, with the booster having a compound accuracy of 0. 1 mm to ensure that the next brake response is not delayed. Dynamic regulation mechanisms: multi-parameter synergetic smart controls
Modern vacuum booster pumps provide precision through triple regulation:
Vacuum self-adaptation: euu monitors vacuum cavity pressure in real time through vacuum sensors when motor speed changes. When the vacuum is less than -50 kpa, the electric vacuum pump activates the supplemental vacuum; the automatic shutdown is higher than -70kpa. Auxiliary ratio linear control: the control valve uses a proportional electromagnetic valve structure to regulate the opening of the valve through the pwm signal. When abs intervened, the euu adjusted the aid ratio from 5:1 to 3:1 to prevent the wheel from dying. Fragmentation design: when the vacuum source fails, the membrane repo spring provides basic help to ensure that drivers can still exert 80n power. Typical application scenario: full-area coverage from vehicle to industrial equipment by vehicle brake systems: conventional fuel vehicles directly use motors to enter a vacuum, low cost and fast response. The hybrid vehicle type uses an electronic vacuum pump with a non-wiring machine with a lifetime of 5,000 hours and noise below 45db(a), which meets the requirements of nvh. Commercial brake reinforcement: heavy trucks are designed with a two-vacuum pump cascade, with a total draw speed of 30 l/min, maintaining -75 kpa vacuum. At a full capacity of 49 tons, the brake distance was 1. 2 metres shorter than the single pump system. (b) industrial equipment vacuum control: the vacuum suction handling system uses a pump + rotz pump mix, with a two-fold increase in the speed of the portfolio and a 40 per cent reduction in energy consumption. The food packaging machine selects the water pump, which can be pumped with aqueous vapour gas and has a maintenance cycle of up to 5,000 hours. Technological evolution: integrated innovation of electrodynamic and intellectualization
As the motorization process accelerates, vacuum boosters are undergoing two major changes: electric substitution and intelligent control. The cable control motor system removes the vacuum source and converts to a direct electric drive to brake the main tank, reducing the response time to 90 ms. Integrated pressure sensors and ai algorithms achieve braking intent projections, with the system predicting a pre-set demand of 0. 3 seconds and a 15 per cent reduction in brake distance。
In the future, with the deep integration of electricization and intellectualization, vacuum-assisted pumps will become a more efficient brake energy management hub, opening a new era of safe travel. Do you think this technology can further enhance the safety of new energy vehicles? Would you prefer a new energy model in the face of a significant increase in the number of electric cars
