Fuel vapor recovery apparatus
First Claim
1. A fuel vapor recovery apparatus comprising:
- an adsorbent canister capable of capturing fuel vapor;
a vapor passage connecting the adsorbent canister to a fuel tank;
an atmospheric air passage communicating the adsorbent canister with the atmosphere;
a purge passage coupling the adsorbent canister to an intake pipe of an internal combustion engine;
a purge pump configured to generate a gas flow from the adsorbent canister to the intake pipe through the purge passage;
a flow control valve provided at the purge passage and configured to regulate the gas flow through the purge passage; and
a pressure regulator configured to compare an absolute value of pressure at an outlet side of the purge pump with an absolute value of pressure at an inlet side of the purge pump under a condition where the purge pump is driven and where the pressure at the outlet side of the purge pump is positive and to make the absolute value of the pressure at the outlet side of the purge pump smaller than the absolute value of the pressure at the inlet side of the purge pump when the absolute value of the pressure at the outlet side of the purge pump is greater than the absolute value of the pressure at the inlet side of the purge pump.
1 Assignment
0 Petitions
Accused Products
Abstract
A fuel vapor recovery apparatus includes an adsorbent canister capable of capturing fuel vapor, a vapor passage connecting the adsorbent canister to a fuel tank, an atmospheric air passage communicating the adsorbent canister with the atmosphere, and a purge passage coupling the adsorbent canister to an intake pipe of an internal combustion engine. In addition, the apparatus includes a purge pump configured to generate a gas flow from the adsorbent canister to the intake pipe through the purge passage, and a flow control valve provided at the purge passage and configured to regulate the gas flow through the purge passage. Further, the apparatus includes a pressure regulator configured to make an absolute value of pressure at an outlet side of the purge pump smaller than an absolute value of pressure at an inlet side of the purge pump while the purge pump is driven.
10 Citations
5 Claims
-
1. A fuel vapor recovery apparatus comprising:
-
an adsorbent canister capable of capturing fuel vapor; a vapor passage connecting the adsorbent canister to a fuel tank; an atmospheric air passage communicating the adsorbent canister with the atmosphere; a purge passage coupling the adsorbent canister to an intake pipe of an internal combustion engine; a purge pump configured to generate a gas flow from the adsorbent canister to the intake pipe through the purge passage; a flow control valve provided at the purge passage and configured to regulate the gas flow through the purge passage; and a pressure regulator configured to compare an absolute value of pressure at an outlet side of the purge pump with an absolute value of pressure at an inlet side of the purge pump under a condition where the purge pump is driven and where the pressure at the outlet side of the purge pump is positive and to make the absolute value of the pressure at the outlet side of the purge pump smaller than the absolute value of the pressure at the inlet side of the purge pump when the absolute value of the pressure at the outlet side of the purge pump is greater than the absolute value of the pressure at the inlet side of the purge pump. - View Dependent Claims (2, 3, 4, 5)
-
Specification