EVAPORATED FUEL TREATING DEVICE

• US 20180274494A1
• Filed: 03/16/2018
• Published: 09/27/2018
• Est. Priority Date: 03/22/2017
• Status: Active Grant

• Current Assignee: Aisan Kogyo Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Aisan Kogyo Kabushiki Kaisha, Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: FUKUI, Keita, YAMAZAKI, Makoto, MIYABE, Yoshikazu
• Granted Patent: US 10,612,495 B2
• Time in Patent Office: Days
• CPC Class Codes: B60K 15/035 characterised by venting means
• CPC Class Codes: B60K 15/03504 adapted to avoid loss of fuel or fuel vapour, e.g. with vapour recovery systems
• CPC Class Codes: B60K 15/03519 Valve arrangements in the vent line
• CPC Class Codes: B60K 2015/03514 with vapor recovery means
• CPC Class Codes: B60K 2015/0358 the venting is actuated by specific signals or positions of particular parts
• CPC Class Codes: F02M 25/08 adding fuel vapours drawn from engine fuel reservoir electrical control of purge system F02D41/003
• CPC Class Codes: F02M 25/0836 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 Class Codes: F02M 25/0854 Details of the absorption canister
• CPC Class Codes: H02P 8/38 the fault being step-out

Abstract

An evaporated fuel treating device includes: a canister configured to adsorb evaporated fuel generated in a fuel tank through a vapor passage; a blocking valve configured to close and open the vapor passage, the blocking valve having a stepping motor as a drive source; and a controller configured to operate the blocking valve by controlling electric power that is supplied from a predetermined power supply to the blocking valve. The controller is configured, when there is a request to drive the blocking valve, to operate the blocking valve by controlling the electric power such that when a voltage that is supplied from the power supply to the blocking valve is less than a predetermined value, a driving period which is an interval between pulses that are supplied to the stepping motor becomes long compared to when the voltage is equal to or higher than the predetermined value.

Claims

1. An evaporated fuel treating device comprising:

a canister configured to adsorb evaporated fuel generated in a fuel tank through a vapor passage;

a blocking valve configured to close and open the vapor passage, the blocking valve having a stepping motor as a drive source; and

a controller configured to operate the blocking valve by controlling electric power that is supplied from a predetermined power supply to the blocking valve,

wherein the controller is configured, in a case where there is a request to drive the blocking valve, to operate the blocking valve by controlling the electric power such that when a voltage that is supplied from the power supply to the blocking valve is less than a predetermined value, a driving period which is an interval between pulses that are supplied to the stepping motor becomes long compared to when the voltage is equal to or higher than the predetermined value.

2. The evaporated fuel treating device according to claim 1, wherein the controller is configured, when an environmental temperature measured by a temperature sensor is high, to set the predetermined value to be higher than when the environmental temperature is low.

3. The evaporated fuel treating device according to claim 2, wherein the controller is configured to set the predetermined value to a value higher than a minimum drive voltage determined in advance for each environmental temperature.

4. The evaporated fuel treating device according to claim 1, wherein the controller is configured to operate the blocking valve in a first driving period when the voltage is less than the predetermined value, and is configured to operate the blocking valve in a second driving period shorter than the first driving period, when the voltage is equal to or higher than the predetermined value.

5. The evaporated fuel treating device according to claim 1, wherein the controller is configured to change the driving period according to a magnitude of the voltage when the voltage is less than the predetermined value.

6. The evaporated fuel treating device according to claim 5, wherein the controller is configured to set the driving period to be longer as the voltage is lower, when the voltage is less than the predetermined value.

7. The evaporated fuel treating device according to claim 1, wherein the controller is configured to set the driving period within a range in which step-out of the stepping motor is avoided, when the voltage is less than the predetermined value.

8. The evaporated fuel treating device according to claim 4, wherein the controller is configured to set the predetermined value such that the predetermined value in a case where the voltage decreases and the predetermined value in a case where the voltage rises are different from each other.