Fuel tank system

Patent metadata

Field	Value
Publication number	US-9441579-B2
Application number	US-201414470327-A
Country	US
Kind code	B2
Filing date	Aug 27, 2014
Priority date	Aug 28, 2013
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

A first pressure sensor that detects pressure in a narrow pressure range with high accuracy is provided in a fuel tank, and a second pressure sensor that detects pressure in a wide pressure range with low accuracy with respect to the first pressure sensor is provided in vapor piping between the fuel tank and a tank blocking valve. Until internal pressure of the fuel tank becomes a second predetermined pressure, meter indication is performed on a display on the basis of a second tank internal pressure P2 calculated by the second pressure sensor and an atmospheric pressure sensor, and when internal pressure of the fuel tank becomes less than the second predetermined pressure, the meter indication is performed on the display on the basis of a first tank internal pressure P1 obtained by the first pressure sensor until internal pressure of the fuel tank becomes a fifth predetermined pressure.

First claim

What is claimed is:

1. A fuel tank system comprising:
a fuel tank mounted on a vehicle;
a canister that absorbs a fuel evaporative emission released from the fuel tank;
piping that connects the canister and the fuel tank;
a blocking valve that is provided in the piping to block the fuel tank;
a filling starting part that instructs a start of filling to the fuel tank;
a first pressure detector arranged in the fuel tank to detect pressure in the fuel tank;
a second pressure detector that detects the pressure in the fuel tank with an accuracy different from an accuracy of the first pressure detector;
a pressure reduction control part that reduces the pressure in the fuel tank to a predetermined pressure by opening the blocking valve when a start of filling is instructed by the filling starting part;
a filling permission part that permits filling when the pressure in the fuel tank becomes the predetermined pressure or less with the pressure reduction control part; and
an indication part that indicates a progress degree of reduction of the pressure in the fuel tank on the basis of a detection result obtained by the second pressure detector in a former stage of a progress degree of the reduction of the pressure during a period from the instruction of the start of filling to the permission of filling, and indicates a progress degree of reduction of the pressure in the fuel tank on the basis of a detection result obtained by the first pressure detector in a latter stage of a progress degree of the reduction of the pressure during the period from the instruction of the start of filling to the permission of filling.

2. The fuel tank system according to claim 1 , wherein the first pressure detector detects pressure in a narrow pressure range with a high accuracy, and the second pressure detector detects pressure in a wider pressure range with a lower accuracy than the first pressure detector.

3. The fuel tank system according to claim 2 , wherein the indication part has a display for indicating a progress degree of the pressure reduction by dividing the progress degree into a plurality of stages, and maintains an indication corresponding to each of the stages of the progress degree of the pressure reduction in the fuel tank on the display at least during a predetermined period.

4. The fuel tank system according to claim 2 , further comprising:
an abnormality detection part that detects abnormality in the fuel tank system, wherein the indication part stops the indication in a case where the abnormality detection part detects abnormality.

5. The fuel tank system according to claim 2 , wherein the first pressure detector is provided in an upper portion of the fuel tank, and the second pressure detector is provided in the piping.

6. The fuel tank system according to claim 1 , wherein the indication part has a display for indicating a progress degree of the pressure reduction by dividing the progress degree into a plurality of stages, and maintains an indication corresponding to each of the stages of the progress degree of the pressure reduction in the fuel tank on the display at least during a predetermined period.

7. The fuel tank system according to claim 1 , further comprising:
an abnormality detection part that detects abnormality in the fuel tank system, wherein the indication part stops the indication in a case where the abnormality detection part detects abnormality.

8. The fuel tank system according to claim 1 , wherein the first pressure detector is provided in an upper portion of the fuel tank, and the second pressure detector is provided in the piping.

Assignees

• Mitsubishi Motors Corp

Inventors

• Iwaya Norifumi
• Wakamatsu Atsushi
• Sano Takayuki

Classifications

• F02M25/089

  Layout of the fuel vapour installation · CPC title

• F02M25/0836 Primary

  Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold · CPC title

• F16K24/04

  for venting only (F16K24/02 takes precedence) · CPC title

• F02M25/0809

  Judging failure of purge control system · CPC title

• F02M2025/0845

  Electromagnetic valves · CPC title