Evaporative emission control system

摘要

A combined system for detecting leaks in an evaporative emission control system and for inflating flat tires. The evaporative emission control system includes a vapor capture canister with a purge valve and a system pressure sensor, and the flat tire repair kit includes a reservoir containing tire inflation fluid, an attachment tube for attaching the reservoir to a tire, and a pump selectively connected to the evaporative emission control system and the reservoir. A controller is configured to perform the following actions: initiate a leak detection sequence by pressurizing the evaporative emission control system, and then performing a leak detection operation by measuring the pressure within the evaporative emission control system over time. A tire pressure monitoring system may be provided, allowing the pump to be switched between performing evaporative system testing and inflating a flat tire.

主权项

1. A combined evaporative emission control system leak detection and tire inflation system for an automotive vehicle having an internal combustion engine and a fuel tank, comprising:
an evaporative emission control system, including:
a canister, in fluid communication with a fuel tank and an engine;a canister purge valve (CPV), interposed in a communication line between the canister and an intake manifold of the engine; anda pressure sensor, positioned to sense vapor pressure in the evaporative emission control system; a flat-tire repair kit, including
a reservoir containing a tire inflation fluid andan attachment tube extending from the reservoir and adapted for connection to a tire on the vehicle; anda pump in fluid communication with the evaporative emission control system and the reservoir; and a controller, configured to
initiate a leak detection sequence;pressurize the evaporative emission control system;measure the evaporative emission control system pressure over a selected period of time; andupon a determination that the evaporative emission control system pressure falls below a preselected threshold within a preselected time, provide a warning of an evaporative emission control system leak.