EVAP system-provided throttle valve control unit
AssigneeToyota Jidosha Kogyo Kabushiki Kaisha
InventorNobuaki Kayanuma
Life of this patent
Estimating the term…
Abstract
An EVAP system-provided throttle valve control unit comprising a pressure-operative throttle positioner for opening and closing a throttle valve, said positioner being always connected to an intake pipe or an intake manifold, a pressure control valve device arranged to open and close according to the discharge pressure of an air pump for the re-combustion of exhaust gas, said positioner being connected to a purge hose from a charcoal canister through said device, and a fuel evaporative emission control system arranged so that when the discharge pressure of said air pump is lower than a prescribed value, said device is opened to connect the positioner to the pressure in said purge hose.
Claims5
A throttle valve control unit having a fuel evaporative emission control system comprising a pressure operative throttle positioner having pressure-operated chamber for opening and closing a throttle valve;
- a conduit connecting the throttle positioner to an intake pipe or manifold;
- an air pump for recombustion of the exhaust gas, driven by the engine;
- a pressure control valve connected to open and close according to the discharge pressure of the air pump;
- a charcoal canister;
- a purge hose connecting the canister to the throttle positioner through the pressure control valve device, said pressure control device being opened to connect said pressure-operated chamber to the pressure in the purge hose when the discharge pressure is lower than a prescribed value, whereby the throttle positioner is actuated to open the throttle valve and discharge purge air into the intake pipe or manifold.
Dependencies are inferred from the claim text.