CN112213109A - Initial phase test method for variable valve timing system of engine - Google Patents
Initial phase test method for variable valve timing system of engine Download PDFInfo
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- CN112213109A CN112213109A CN202010976231.1A CN202010976231A CN112213109A CN 112213109 A CN112213109 A CN 112213109A CN 202010976231 A CN202010976231 A CN 202010976231A CN 112213109 A CN112213109 A CN 112213109A
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- variable valve
- valve timing
- timing system
- engine
- initial phase
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
Abstract
An initial phase test method for a variable valve timing system of an engine belongs to the technical field of engine tests. The variable valve timing system for the test is installed on an engine for the test, the variable valve timing system in the S1 is respectively connected with the CAN information acquisition equipment, the full-flow diluting bag collecting and discharging equipment and the direct collecting and discharging equipment and is fixed on a chassis dynamometer, the initial phase of the variable valve timing system is replaced under the normal temperature condition to carry out multiple working condition tests, the test results of the multiple working conditions are recorded, and the test results of the multiple working conditions are compared to obtain the optimal initial phase of the variable valve timing system for the whole vehicle to discharge. The invention can effectively avoid the test period wasted by replacing the variable valve timing system, shorten the test process, realize accurate adjustment, ensure the test accuracy, and change the initial phase of the variable valve timing system of the engine in the whole cold state so as to comprehensively reduce the influence of the starting time of the engine on the emission.
Description
Technical Field
The invention relates to an initial phase test method for a variable valve timing system of an engine, and belongs to the technical field of engine tests.
Background
Along with the day of environmental pollutionThe pollution discharge of the automobile is seriously controlled, and the problem to be solved is urgently solved. The pollutants discharged by the whole vehicle mainly relate to CO and NOXTHC (total hydrocarbons in exhausted gas) and particulate matters are contained, and a large amount of THC, CO and particulate matters are generated due to low engine body temperature, starting oil injection enrichment control, insufficient air intake combustion and other reasons when the whole vehicle is started in a cold state; under the working condition of large load of the heat engine, the engine runs at high speed, and NO can be generated when the temperature is too highX. The generation position of THC is basically concentrated at the cold starting time of the engine, and the state of the initial operation time of the engine, particularly the relation between fuel injection, ignition and engine air inlet needs to be controlled to control the THC discharge amount.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides an initial phase test method of a variable valve timing system of an engine.
The invention adopts the following technical scheme: an engine variable valve timing system initial phase test method, the method comprising the steps of:
s1: mounting a variable valve timing system for test on an engine for test;
s2: respectively connecting the variable valve timing system in the S1 with CAN information acquisition equipment, full-flow dilute bag mining and discharging equipment and direct mining and discharging equipment, and fixing the variable valve timing system on a chassis dynamometer;
s3: under the condition of normal temperature, replacing the initial phase of the variable valve timing system to perform multiple working condition tests;
s4: recording the test results of the multiple working conditions;
s5: comparing test results of multiple working conditions;
s6: and obtaining the initial phase of the variable valve timing system with the optimal vehicle emission.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention adjusts the initial phase of the variable valve timing system, can effectively avoid the test period wasted by changing the variable valve timing system, shortens the test process, can realize accurate adjustment and ensures the test accuracy.
2. The invention changes the initial phase of the variable valve timing system of the engine in the state of the whole engine cooling machine so as to comprehensively reduce the influence of the starting time of the engine on the emission.
Detailed Description
The technical solutions in the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the invention, rather than all embodiments, and all other embodiments obtained by those skilled in the art without any creative work based on the embodiments in the present invention belong to the protection scope of the present invention.
The first embodiment is as follows: the invention discloses an initial phase test method of a variable valve timing system of an engine, which comprises the following steps:
s1: mounting a variable valve timing system for test on an engine for test;
s2: respectively connecting the variable valve timing system in S1 with CAN (controller area network) information acquisition equipment, full-flow dilute bag mining and discharging equipment and direct mining and discharging equipment, and fixing the variable valve timing system on a chassis dynamometer;
s3: under the condition of normal temperature (23 +/-5 ℃), replacing the initial phase of the variable valve timing system to perform multiple working condition tests;
s4: recording the test results of the multiple working conditions;
various operating conditions were performed on the engine, and the test results were as follows:
(the initial phase of the variable valve timing system is changed relative to the original position, that is, '0' is unchanged in the original state, '+' is increased and '-' is decreased)
S5: comparing test results of multiple working conditions;
in the emission test of the whole vehicle at normal temperature, as THC is basically generated in the vehicle starting stage, when the initial phase of the variable valve timing system is changed and only the WLTC first working condition is carried out, the THC emission can be compared with the THC emission of the whole cycle, and whether the test result meets the requirement can be judged according to the standard limit value.
S6: and obtaining the initial phase of the variable valve timing system with the optimal vehicle emission.
The second embodiment is as follows: in this embodiment, a cooling device is provided in the engine, which will be described further below with respect to a first embodiment.
The third concrete implementation mode: in this embodiment, a second embodiment is further described, and the cooling device includes at least one of a cooling fan and cooling circulation water.
Because the water temperature of the engine can continuously rise when the vehicle is started and operated, and the normal cooling mode is at least 3-4 hours, in order to ensure that the engine of the vehicle recovers to the normal temperature state as soon as possible, the mode of combining the constant temperature of the environment temperature, the cooling fan arranged on the engine compartment and the external cooling device of the cooling circulating water of the engine is adopted, the temperature cooling period of the whole vehicle is greatly shortened, and the test can be repeatedly verified in a short period.
The fourth concrete implementation mode: in this embodiment, which will be further described with reference to the first or third embodiment, the initial phase of the variable valve timing system in S3 is changed by-16 °, -12 °, -8 °, -4 °, 0 °, +4 °, +8 °, and +12 ° -with respect to the home position, respectively
The working principle of the test method is as follows: according to the accumulation of the national model I test data, when the vehicle is at normal temperature (23 +/-5 ℃), the THC generated by the first working condition of the WLTC operation of the vehicle is the main THC source of the test result, so that the initial phase of the variable valve timing system is changed by changing the variable valve timing system when the vehicle is placed in the normal temperature environment, and the vehicle is started and operates in the first stage of the working condition of the WLTC circulation curve. After the test is started, the state and the emission condition of the vehicle engine are monitored by combining the full-flow bag data, the second data and the CAN data, and the initial phase of the optimal variable valve timing system is judged, so that the emission of the whole vehicle is optimized.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (4)
1. An initial phase test method of an engine variable valve timing system is characterized in that: the method comprises the following steps:
s1: mounting a variable valve timing system for test on an engine for test;
s2: respectively connecting the variable valve timing system in the S1 with CAN information acquisition equipment, full-flow dilute bag mining and discharging equipment and direct mining and discharging equipment, and fixing the variable valve timing system on a chassis dynamometer;
s3: under the condition of normal temperature, replacing the initial phase of the variable valve timing system to perform multiple working condition tests;
s4: recording the test results of the multiple working conditions;
s5: comparing test results of multiple working conditions;
s6: and obtaining the initial phase of the variable valve timing system with the optimal vehicle emission.
2. The initial phase test method of the variable valve timing system of the engine according to claim 1, characterized in that: and a cooling device is arranged on the engine.
3. The initial phase test method of the variable valve timing system of the engine according to claim 2, characterized in that: the cooling device comprises at least one of a cooling fan and cooling circulating water.
4. An engine variable valve timing system initial phase test method according to claim 1 or 3, characterized in that: the initial phase of the variable valve timing system in S3 is changed by-16 °, -12 °, -8 °, -4 °, 0 °, +4 °, +8 °, and +12 °, respectively, with respect to the home position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010976231.1A CN112213109A (en) | 2020-09-16 | 2020-09-16 | Initial phase test method for variable valve timing system of engine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010976231.1A CN112213109A (en) | 2020-09-16 | 2020-09-16 | Initial phase test method for variable valve timing system of engine |
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| CN112213109A true CN112213109A (en) | 2021-01-12 |
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| CN202010976231.1A Pending CN112213109A (en) | 2020-09-16 | 2020-09-16 | Initial phase test method for variable valve timing system of engine |
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