CN109445408B - Method for measuring real-time desorption flow of automobile carbon canister - Google Patents
Method for measuring real-time desorption flow of automobile carbon canister Download PDFInfo
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- CN109445408B CN109445408B CN201811230095.0A CN201811230095A CN109445408B CN 109445408 B CN109445408 B CN 109445408B CN 201811230095 A CN201811230095 A CN 201811230095A CN 109445408 B CN109445408 B CN 109445408B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0243—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults model based detection method, e.g. first-principles knowledge model
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F9/00—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine
- G01F9/02—Measuring volume flow relative to another variable, e.g. of liquid fuel for an engine wherein the other variable is the speed of a vehicle
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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- Supplying Secondary Fuel Or The Like To Fuel, Air Or Fuel-Air Mixtures (AREA)
Abstract
A method for testing the desorption flow of a carbon tank in real time mainly comprises the steps of building a test system and acquiring and processing data. The method defines the test point of the desorption flow rate of the carbon tank and the connection method of the flowmeter, and utilizes the analog signal acquisition module to acquire the analog signal of the flowmeter for the desorption flow rate test of the carbon tank, and then synchronously acquires the vehicle signal and the analog signal of the flowmeter through the electronic injection parameter acquisition module. According to the method, signals such as vehicle speed, engine rotating speed and engine torque are synchronously acquired with the desorption flow rate of the carbon canister, the time period of the desorption flow rate is intercepted through the time period of the vehicle speed, and finally the desorption flow rate is integrated by taking time as a variable. The method provides technical support for comparison and analysis of the operating condition and desorption flow rate of the engine, improvement of desorption flow of the carbon canister in the high-temperature driving process and reduction of evaporative pollutant emission in the development process.
Description
Technical Field
The invention belongs to the field of automobile testing, and particularly relates to a method for testing the desorption flow of a carbon canister in real time based on a specific working condition.
Background
With the release of the emission limit of light automobile pollutants and the measurement method (sixth stage of China), the emission limit of evaporative pollutants in type IV test is reduced from 2.0g/test to 0.7g/test, which is up to 65%. The source of evaporative contaminants is primarily the fuel system. In the process of evaporative pollutant emission development, engineers reduce the pollutant sources of an engine, a carbon canister, an oil tank and the like through different paths and methods, design an evaporative pollutant control system, control adsorption and desorption of the carbon canister, effectively prevent fuel oil from escaping, and meet the requirement of regulation limit.
In the six evaporative pollutant emission test flows in China, the WLTC working condition is operated by regulations, the working conditions are almost all transient working conditions, and how to synchronously measure the flow in the working process of the carbon tank based on the operating working conditions and analyze the control strategy of the carbon tank becomes a difficult problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for testing the desorption flow of a carbon canister in real time, which can accurately measure the desorption flow of the carbon canister under the regulation working condition, and synchronize the desorption flow with vehicle signals (vehicle speed, engine rotation, torque and the like) so as to optimize the control strategy of the carbon canister work and provide technical support for optimization and improvement in the evaporative pollutant emission development process.
The technical scheme of the invention is as follows:
a method for testing the desorption flow of a carbon tank in real time comprises the following steps:
(1) signal acquisition: synchronously acquiring flow analog signals and vehicle speed, engine rotation and torque signals of an atmospheric end of a carbon tank stop valve;
(2) processing and synchronizing desorption flow data:
(2.1) extracting time axis, vehicle speed and desorption flow analog signals by using an acquisition control module to generate a required data format;
(2.2) calculating the desorption flow rate FL (L/min) of the carbon tank by utilizing the relation between the flow analog signal and the flow rate;
(2.3) synchronizing the tested flow analog signal and the vehicle speed signal by taking time as a reference; intercepting the flow simulation signal during the period by using the starting time and the ending time of the vehicle speed, thereby abandoning the invalid flow simulation signal in the test;
(2.4) integrating the data of the desorption flow rate FL (L/min) of the carbon tank by taking time(s) as a variable to obtain desorption flow (L)
F＝∫FL*dt
In the formula: f is the desorption flow of the carbon canister, L and FL are the flow rate of the carbon canister, L/min and dt is time.
Further, the invention also comprises (3) analysis of the carbon canister desorption control strategy:
(3.1) combining the desorption flow rate of the carbon canister with a rule working condition curve and vehicle signals, and establishing a relation graph of the desorption flow rate, the engine load, the engine rotating speed, the air-fuel ratio and other signals by taking time as an axis;
and (3.2) the desorption control strategy of the carbon canister is optimized by analyzing the desorption flow rate of the carbon canister and pertinently adjusting and optimizing a carbon canister control valve.
Further, the specific adjustment and optimization of the canister control valve by analyzing the desorption flow rate of the canister is to increase the desorption flow rate by adjusting the opening of the canister control valve and the air-fuel ratio at the flow trough; and at the flow rate peak, the opening degree of the carbon tank control valve is reduced or increased by comparing the size of the air-fuel ratio, so that closed-loop control with the air-fuel ratio of 1 is achieved.
Further, the method also comprises the steps of setting up a test system:
(1) connecting the carbon tank stop valve with an atmosphere end connector, disconnecting the carbon tank stop valve and connecting the carbon tank stop valve with a flowmeter, and connecting the other end of the flowmeter with atmosphere;
(2) outputting a wire harness by utilizing a flowmeter voltage analog signal, and outputting the analog signal through the analog signal;
(3) vehicle signals such as vehicle speed, engine rotation, torque and the like are output through the OBD diagnosis port;
(4) integrating flow analog signals and vehicle signals into the same data acquisition module through different acquisition channels, e.g., EATS592
The CAN channel and the ETH channel collect different signals and then output the signals to the industrial personal computer in a unified way.
(5) And controlling software triggering by using an acquisition module to realize synchronous signal acquisition.
The method is characterized in that: the method comprises the steps of determining a test point of the desorption flow rate of the carbon tank and a connection method of a flowmeter, acquiring an analog signal of the flowmeter for the desorption flow rate test of the carbon tank by using an analog signal acquisition module, and then synchronously acquiring a vehicle signal and an analog signal of the flowmeter by using an electronic injection parameter acquisition module. Signals such as vehicle speed, engine rotating speed and engine torque are synchronously acquired with the desorption flow rate of the carbon canister, the time period of the desorption flow rate is intercepted through the time period of the vehicle speed, and finally the desorption flow rate is integrated by taking time as a variable. The method provides technical support for comparison and analysis of the operating condition and desorption flow rate of the engine, improvement of desorption flow of the carbon canister in the high-temperature driving process and reduction of evaporative pollutant emission in the development process.
Drawings
FIG. 1 is a schematic view of a system for testing the real-time desorption flow rate of a built carbon canister according to the invention
FIG. 2 is a schematic diagram of the signal synchronous acquisition of the present invention
FIG. 3 is a schematic view of a flow chart of a desorption flow rate test of national six evaporative pollutant emission during high-temperature driving
FIG. 4 is a schematic diagram of a data post-processing step
FIG. 5 is a schematic diagram of a vehicle speed signal time segment at a working point
FIG. 6 is a schematic diagram of the vehicle speed and desorption flow rate intercepting time period
Wherein: the method comprises the following steps of 1-a flow meter, 2-a carbon tank stop valve, 3-a carbon tank control valve, 4-a test vehicle carbon tank, 5-a test vehicle oil tank, 6-an analog signal acquisition module, 7-an electronic injection parameter acquisition module, 8-a lower computer and 9-a test vehicle.
Detailed Description
The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
The carbon canister desorption flow rate testing system is constructed as shown in figure 1 by implementing the method, and comprises a flow meter 1 for carbon canister desorption flow rate testing, a carbon canister stop valve 2, a carbon canister control valve 3, a testing vehicle carbon canister 4 and a testing vehicle oil tank 5.
The specific implementation steps of the flow meter connection for the carbon canister desorption flow rate test are as follows:
A. confirming normal connection of pipelines among the carbon tank stop valve 2, the carbon tank control valve 3, the test vehicle carbon tank 4 and the test vehicle oil tank 5;
B. the carbon tank stop valve 2 is disconnected by an atmosphere end connecting pipe;
C. the atmosphere end of the carbon tank stop valve 2 is connected with the outlet of the flow meter for the carbon tank desorption flow rate test through a rubber hose, so that the connection air tightness is ensured.
A method for testing the desorption flow of a carbon tank in real time and synchronously analyzing the desorption flow strategy of the carbon tank based on specific working conditions is characterized in that signal synchronous acquisition is realized as shown in figure 2, and comprises a flow meter 1 for carbon tank desorption flow rate testing, an analog signal acquisition module 6, an electronic injection parameter acquisition module 7, a lower computer 8 and a test vehicle 9.
The signal acquisition connection is implemented as follows:
A. the analog signal output wire harness of the flowmeter 1 for the carbon canister desorption flow rate test is connected to the input end of the analog signal acquisition module 6, and the positive signal and the negative signal are correspondingly connected;
B. the signal output end of the analog signal acquisition module 6 is connected to the LIN input interface of the electronic injection parameter acquisition module 7;
C. the test vehicle 9 is connected to a CAN input interface of the electronic injection parameter acquisition module 7 through an OBD diagnosis port;
D. the electronic injection parameter acquisition module 7 is connected with and communicates with a lower computer 8 through an Ethernet port.
A method for testing the desorption flow of a carbon canister in real time and synchronously analyzing the desorption flow strategy of the carbon canister based on specific working conditions is disclosed, the test flow is shown in figure 3, and the specific implementation steps are as follows:
A. the vehicle moves to the rotating hub, is bound front and back, and is bound to the level of the vehicle needing attention;
B. checking the correct connection of the flow meter and the collection device as shown in figures 1 and 2;
C. after the flow meter and the acquisition equipment are correctly connected, the lower computer 8 is opened, and data acquisition software is operated. Checking whether the signal test is normal;
D. after the signal is confirmed to be tested normally, the vehicle runs according to a working condition curve specified by a rule and starts data acquisition synchronously;
E. the vehicle runs according to the working condition curve until the working condition is finished;
F. stopping the vehicle and turning off the engine, stopping data acquisition, storing and exporting data in a data format dat;
G. the test was completed.
A method for testing the desorption flow of a carbon tank in real time and synchronously analyzing the desorption flow strategy of the carbon tank based on specific working conditions is disclosed, wherein the data post-processing flow is shown in figure 4, and the specific implementation steps are as follows:
A. an electronic injection parameter extraction module collects time axis, speed and desorption flow rate analog signals in data, and converts a file format from star dat to an excel format;
B. converting the desorption flow velocity analog signal (V) into a flow velocity signal (L/min) through a conversion relation between the analog signal (V) and the flow velocity signal (L/min) specified by the factory specifications of the flowmeter 1 for the desorption flow velocity test of the carbon canister;
FL＝a*FV+b
in the formula: FL is the desorption flow rate measured by the flowmeter 1 for the carbon canister desorption flow rate test, and is unit L/min; FV is desorption flow velocity analog signal measured by the flowmeter 1 for the canister desorption flow velocity test, unit V; a. b is a conversion relation coefficient between an analog signal and an actual flow velocity signal specified by a flow meter 1 for the carbon canister desorption flow velocity test.
C. Taking the extracted time axis(s), vehicle speed (km/h) and desorption flow rate (L/min) signals as a reference, and intercepting a working condition curve time period specified by a regulation, as shown in figure 5;
D. storing the time axis(s), the vehicle speed (km/h) and the desorption flow rate (L/min) in the interception time period as shown in FIG. 6;
E. and integrating the intercepted time axis(s) and desorption flow rate (L/min) data by taking time(s) as a variable to obtain desorption flow (L).
F＝∫FL*dt
In the formula: f is the desorption flow of the carbon tank in the high-temperature driving process, the unit L and FL are the desorption flow rate tested by the flow meter 1 for the carbon tank desorption flow rate test, and the unit L/min and dt are time-based variables.
After the data processing, the data can be used as basic data support for carbon canister desorption strategy analysis, and further carbon canister desorption control strategy analysis is as follows:
(1) combining the desorption flow rate of the carbon canister with a rule working condition curve and vehicle signals, and establishing a relation graph of the desorption flow rate, engine load, engine rotating speed, air-fuel ratio and other signals by taking time as an axis;
(2) the desorption control strategy of the carbon tank is optimized by analyzing the desorption flow rate of the carbon tank and adjusting and optimizing the carbon tank control valve in a targeted manner. The specific adjusting and optimizing mode is that the desorption flow rate is increased by adjusting the opening of the carbon canister control valve and the air-fuel ratio in the flow rate trough; and at the flow rate peak, the opening degree of the carbon tank control valve is reduced or increased by comparing the size of the air-fuel ratio, so that closed-loop control with the air-fuel ratio of 1 is achieved.
Claims (3)
1. A method for testing the desorption flow of a carbon tank in real time is characterized by comprising the following steps:
(1) signal acquisition: synchronously acquiring flow analog signals and vehicle speed, engine rotation and torque signals of an atmospheric end of a carbon tank stop valve;
(2) processing and synchronizing desorption flow data:
(2.1) extracting time axis, vehicle speed and desorption flow analog signals by using an acquisition control module to generate a required data format;
(2.2) calculating the desorption flow rate FL of the carbon tank by utilizing the relation between the flow analog signal and the flow rate;
FL＝a*FV+b
in the formula: FL is the desorption flow rate of the carbon tank, and the unit is L/min; FV is desorption flow rate analog signal, unit V; a. b is a conversion relation coefficient between an analog signal specified by a factory instruction of the flowmeter for the desorption flow rate test of the carbon canister and an actual flow rate signal;
(2.2) synchronizing the tested flow analog signal and the vehicle speed signal by taking time as a reference; intercepting the flow simulation signal during the period by using the starting time and the ending time of the vehicle speed, thereby abandoning the invalid flow simulation signal in the test;
(2.4) integrating the desorption flow rate FL data of the carbon canister by taking time as a variable to obtain desorption flow
F＝∫FL*dt
In the formula: f is the desorption flow of the carbon tank, L is the unit, FL is the desorption flow rate of the carbon tank, L/min is the unit, t is time, and s is the unit;
(3) and (3) analyzing a carbon canister desorption control strategy:
(3.1) combining the desorption flow rate of the carbon canister with a rule working condition curve and a vehicle signal, and establishing a relation graph of the desorption flow rate, the engine load, the engine rotating speed and an air-fuel ratio signal by taking time as an axis;
and (3.2) the desorption control strategy of the carbon canister is optimized by analyzing the desorption flow rate of the carbon canister and pertinently adjusting and optimizing a carbon canister control valve.
2. The method for testing the desorption flow of the carbon canister in real time as claimed in claim 1, wherein the step of adjusting and optimizing the carbon canister control valve in a targeted manner by analyzing the desorption flow rate of the carbon canister is that the desorption flow rate is increased by adjusting the opening degree of the carbon canister control valve and the air-fuel ratio at the flow rate trough; and at the flow rate peak, the opening degree of the carbon tank control valve is reduced or increased by comparing the size of the air-fuel ratio, so that closed-loop control with the air-fuel ratio of 1 is achieved.
3. The method for testing the desorption flow rate of the carbon canister in real time according to claim 1 or 2, which is characterized by further comprising the step of building a test system:
(1) connecting the carbon tank stop valve with an atmosphere end connector, disconnecting the carbon tank stop valve and connecting the carbon tank stop valve with a flowmeter, and connecting the other end of the flowmeter with atmosphere;
(2) outputting a wire harness by utilizing a flowmeter voltage analog signal, and outputting the analog signal through the analog signal;
(3) outputting vehicle speed, engine rotation and torque signals through the OBD diagnosis port;
(4) integrating the flow analog signals and the vehicle signals to the same data acquisition module through different acquisition channels;
(5) and controlling software triggering by using an acquisition module to realize synchronous signal acquisition.
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| CN110823591A (en) * | 2019-10-16 | 2020-02-21 | 黄山市徽州和顺实业有限公司 | Detection system for desorption flow of high-load pipeline of automobile carbon tank |
| CN112098018B (en) * | 2020-08-14 | 2023-05-16 | 中国第一汽车股份有限公司 | Carbon tank test system and test method |
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| US5216991A (en) * | 1991-09-02 | 1993-06-08 | Nippondenso Co., Ltd. | Internal combustion engine controller |
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