Car-mounted leakage diagnosing device and fuel evaporation control system
A technology for diagnosing a device and a fuel tank, which is applied in the charging system, engine control, fuel injection control, etc., can solve the problems of inconvenient post-maintenance of the device and many parts, and achieve the effect of convenient post-maintenance and simple and reliable judgment logic.
Active Publication Date: 2020-11-27
DONGFENG MOTOR CORP HUBEI +1
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Problems solved by technology
Although it can achieve the goal of low cost, but it consists of relatively many parts, which is inconvenient for later maintenance of the device
Method used
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[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0040] Such as figure 1 with figure 2 As shown, the vehicle-mounted leakage diagnosis device 00 of the fuel evaporation system of the present invention includes an upper end cover 10, a booster pump assembly 20, a valve body 30, a lower end 40, a sliding float 50 and a miniature spring 60, and the upper end cover 10 is provided with a first tube joint 11, the valve body 30 is provided with a second pipe joint 31; in the fuel evaporation control system (such as Figure 10) The first pipe joint 11 of the device is connected with the ash filter 100, and the second pipe joint 31 is connected with the atmospheric port 400c of the carbon tank. When the device is not powered on, the first pipe joint 11 and the second pipe joint 31 are directly connected through the side hole 36a of the graphite conduit; After the port 22a, the outlet pipe port 22b...
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The invention relates to a car-mounted leakage diagnosing device and a fuel evaporation control system. The car-mounted leakage diagnosing device comprises an upper end cover, a booster pump assembly,a valve body, a lower end cover, a sliding floater and a micro spring. A first pipe joint is arranged on the upper end cover, and a second pipe joint is arranged on the valve body. When no electricity is obtained, the booster pump assembly does not work, airflow enters from the first pipe joint and directly flows into a passage of the second pipe joint, a carbon tank directly communicates with anash filter, and therefore the ventilating pressure drop of the fuel evaporation control system is small. After electricity is obtained, airflow compressed by a booster pump enters the fuel evaporation control system; due to the fact that the booster pump output flow is a constant value, the time needed for reaching set pressure in the fuel evaporation control system is a test value, and thereforethe time needed by a standard hole connected with an empty oil tank can be preset as a reference value; and if the test value is the larger than the reference value, an ECU judges that the system suffers from leakage, otherwise the it is judged that the system does not suffer from leakage.
Description
technical field [0001] The invention relates to the technical field of vehicle fuel vapor leakage diagnosis, in particular to a vehicle-mounted leakage diagnosis device and a fuel evaporation control system. Background technique [0002] The fuel evaporation control system usually consists of a fuel tank assembly, a carbon canister assembly, an ash filter, a canister desorption control valve and its connecting pipelines. If any part of the fuel evaporation control system leaks, the environment will be polluted. Therefore, the new emission regulations have clearly required the on-board automatic diagnostic system (OBD) to identify and signal possible leaks, and then provide the corresponding data to the on-board memory for offline diagnosis in the factory. [0003] The prior art discloses a leakage detection system for a fuel tank of a vehicle, which can diagnose whether there is leakage in the fuel system by utilizing the pressure signal change caused by the natural vacuum ...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F02D41/22F02D41/00F02M25/08
CPCF02D41/22F02D41/003F02M25/0818F02D2041/225Y02T10/40
Inventor 黄运忠吴晓飞杨依占祺郭蓉贞
Owner DONGFENG MOTOR CORP HUBEI