One of the primary focuses of modern vehicle emission control systems is to prevent harmful vapors from the fuel tank from escaping into the atmosphere. As temperatures and pressure fluctuations naturally occur, volatile organic compounds (VOCs) are emitted from the gas tank. To address this, vehicles incorporate evaporative emission controls (EVAP) that trap these compounds and return them to the fuel tank to be burned as fuel.


History and Evolution of Purge Pumps

Traditionally, EVAP systems relied on vacuum-induced purge from the intake manifold under certain driving conditions to return the captured vapors. Automotive Active Purge Pump However, variations in vacuum levels meant not all vapors were reliably purged. To improve purging effectiveness, active canister purge pumps were developed. The first generation employed simple mechanical diaphragm pumps directly driven by the camshaft. While helping boost purge flow, they were bulky and inefficient.


Advancements in Design and Controls

More recently, automakers have turned to smaller electric purge pumps with more sophisticated controls. Located near the canister, automotive active purge pump can be precisely timed to optimize purging. Microprocessor-based EVAP monitors now control pump operation based on intricate algorithms factoring in variables like temperature, drive cycles, and purge profiles.

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