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Evaporated fuel treatment device

A technology for evaporating fuel and processing device, which is applied in the field of evaporating fuel processing device and can solve problems such as pressure drop in a fuel tank

Active Publication Date: 2019-04-26
AISAN IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the internal pressure of the fuel tank decreases due to the negative pressure of the intake path.

Method used

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  • Evaporated fuel treatment device
  • Evaporated fuel treatment device
  • Evaporated fuel treatment device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0050] refer to figure 1 The fuel supply system 6 including the evaporated fuel processing device 20 will be described. The fuel supply system 6 includes: a main supply path 10 for supplying the fuel stored in the fuel tank 14 to the engine 2 ; and a purge supply path 22 for supplying evaporated fuel generated in the fuel tank 14 to the engine 2 .

[0051] A fuel pump member 16 , a supply path 12 , and an injector 4 are provided on the main supply path 10 . The fuel pump unit 16 includes a fuel pump, a pressure regulator, a control circuit, and the like. The fuel pump unit 16 controls the fuel pump according to a signal supplied from the ECU 100 . The fuel pump boosts the fuel in the fuel tank 14 and discharges it. The fuel injected from the fuel pump is pressure-regulated by a pressure regulator, and is supplied from the fuel pump unit 16 to the supply path 12 . The supply path 12 is connected to a fuel pump unit 16 and the injector 4 . The fuel supplied to the supply ...

no. 2 example

[0093] Points different from the first embodiment will be described. Such as Figure 9 As shown, compared with the evaporated fuel processing device 20 of the first embodiment, the evaporated fuel processing device 20 of the second embodiment includes a pump 248 instead of the pump 48 . The pump 248 is controlled by the control unit 102 and pressure-feeds gas from the side of the canister 19 to the side of the air filter (that is, the side of the atmosphere) through the atmosphere path 17 .

[0094] The control unit 102 executes a process of detecting whether the first to third pressure sensors 42 , 44 , 46 and the pump 48 are not operating normally. This processing includes Figure 10 shown in the stress detection process and Figure 12 to Figure 15 The normal judgment processing shown.

[0095] In stress detection processing, with image 3 The processing of S72 to S76 is similarly performed in S12 to S16. In S76 , the communication space 15 is brought into a negative p...

no. 3 example

[0117] Points different from the first embodiment will be described. Such as Figure 16 As shown, compared with the evaporated fuel processing device 20 of the first embodiment, the evaporated fuel processing device 20 of the third embodiment includes a pump 348 instead of the pump 48 . Pump 348 is disposed on purge path 24 . The pump 348 is arranged between the first pressure sensor 42 and the adsorption tank 19 . The pump 348 is controlled by the control unit 102 to pressure-feed gas from the side of the adsorption tank 19 to the side of the control valve 26 .

[0118] The evaporated fuel processing device 20 further includes an atmospheric valve 347 . The atmospheric valve 347 is arranged on the atmospheric path 17 . The atmospheric valve 347 is arranged on the atmospheric side of the second pressure sensor 44 . The atmospheric valve 347 is switched between opening and closing by the controller 102 . When the valve is opened, it is in an atmosphere communication state...

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PUM

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Abstract

This evaporated fuel treatment device may be provided with: a canister that communicates with a fuel tank via a tank channel, communicates with an air intake channel of an internal combustion engine via a purge channel, and communicates with the atmosphere via an atmosphere channel; a control valve that switches between a closed state of closing the purge channel and an open state of opening the purge channel; a pump that changes the pressure in a communication space defined by the fuel tank, the tank channel, the canister, the atmosphere channel, and the purge channel when the control valve is in the closed state; a pressure detection unit disposed in the communication space; and a determination unit that uses the pressure detection result of the pressure detection unit to determine thatthe evaporated fuel treatment device is not operating properly when the control valve is in the closed state and the pressure in the communication space has been changed by the pump.

Description

technical field [0001] This specification relates to an evaporated fuel processing device mounted on a vehicle. Background technique [0002] An evaporated fuel processing device is disclosed in Japanese Patent Application Laid-Open No. 2003-343362. The evaporated fuel processing device includes: an adsorption canister that adsorbs evaporated fuel in the fuel tank; a control valve that is disposed on a purge path that communicates the adsorption canister with an intake path; and a pressure sensor that detects the internal pressure of the fuel tank. . The evaporated fuel processing device supplies a mixed gas of evaporated fuel and air (hereinafter referred to as "purge gas") in the canister to the intake path via the purge path. [0003] The evaporated fuel processing device determines whether the evaporated fuel processing device is operating normally, such as whether the pressure sensor is operating normally, whether the control valve is normally driven, or not. Specifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/08
CPCF02M25/08F02M25/0809F02M25/0836F02M25/089B60K15/03504B60K2015/03514
Inventor 加藤伸博
Owner AISAN IND CO LTD
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