CN110131150B - System and method for testing instantaneous friction torque of oil pump - Google Patents
System and method for testing instantaneous friction torque of oil pump Download PDFInfo
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- CN110131150B CN110131150B CN201910387180.6A CN201910387180A CN110131150B CN 110131150 B CN110131150 B CN 110131150B CN 201910387180 A CN201910387180 A CN 201910387180A CN 110131150 B CN110131150 B CN 110131150B
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- oil
- oil pump
- pump
- storage tank
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0088—Testing machines
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The invention discloses a test system for the instantaneous friction torque of an oil pump, which comprises a frequency converter, a motor, a dynamic torque sensor, an oil pump, a transient pressure sensor, a mass flowmeter, an oil delivery pipe, an oil storage tank and an oil temperature heater, wherein the frequency converter is connected with the motor; the motor is connected with one end of the torque sensor through a coupler; the other end of the torque sensor is connected with the oil pump through a coupler; an oil inlet of the oil pump is connected with the oil storage tank, and an oil outlet of the oil pump is connected with the mass flowmeter; the transient pressure sensor is connected with the oil pump; the mass flowmeter is connected with the oil pipeline; the oil delivery pipe is connected with the oil storage tank; when pumping oil, the engine oil is pumped out from the oil storage tank, and then the pumped engine oil flows back to the oil storage tank through the mass flow meter and the oil conveying pipe. The invention can accurately obtain the instantaneous friction torque of the oil pump, and has simple structure, environmental protection, energy saving and low manufacturing cost.
Description
Technical Field
The invention relates to the technical field of vehicle oil pump detection, in particular to a system and a method for testing instantaneous friction torque of an oil pump.
Background
The driving power of the engine oil pump of the engine accounts for 3-5% of the effective power of the engine. In order to meet the increasingly strict requirements for limiting the fuel consumption of vehicles, reducing the driving power loss of the oil pump is becoming one of the important targets for designing the automobile engine. The driving power of the oil pump mainly comprises two parts: hydraulic output power and mechanical friction power.
Hydraulic output power P of engine oil pumphd＝Pout*QoutI.e. the product of outlet pressure and outlet flow, is mainly influenced by the lubricant outlet pressure and the lubricant flow (including the theoretical flow and the leakage flow of the oil pump).
Mechanical friction power loss P of oil pumpf＝TfN, the product of the friction torque and the rotational speed, the friction torque is mainly influenced by the rotor type (internal gear, blades, etc.) and the end face fit clearance.
Currently, part 1 of the oil pump of the JB/T8413.1-2010 internal combustion engine: the technical conditions of the assembly only specify the hydraulic output power, and no clear definition and corresponding test method are provided for the mechanical friction power loss.
In view of the above, the present invention provides a method for measuring the instantaneous friction torque of an oil pump by a test system to solve the above problems.
Disclosure of Invention
The invention aims to provide a test method which can measure the instantaneous friction torque of the oil pump so as to accurately obtain the instantaneous friction torque of the oil pump, and has the advantages of simple structure, environmental protection, energy conservation and low manufacturing cost.
Therefore, the technical scheme provided by the invention is as follows:
a test system for the instantaneous friction torque of an oil pump comprises a frequency converter, a motor, a dynamic torque sensor, an oil pump, a transient pressure sensor, a mass flowmeter, an oil storage tank, an oil temperature heater and an oil delivery pipe. The frequency converter is connected with the motor and is used for controlling the rotation frequency of the motor; the motor is connected with one end of the torque sensor through a coupler; the other end of the dynamic torque sensor is connected with the oil pump through a coupler, and the dynamic torque sensor can output 360 torque and rotating speed signals in the process that the oil pump rotates for one circle, so that transient torque measurement is realized; the motor can indirectly drag the engine oil pump to rotate so as to control the rotating speed of the engine oil pump; an oil inlet of the oil pump is connected with the oil storage tank; the transient pressure sensor is arranged at an oil outlet of the oil pump; one end of the mass flow meter is connected with an oil outlet of the oil pump, and the mass flow meter can measure the transient flow of the oil outlet of the oil pump; one end of the oil pipeline is connected with the other end of the mass flowmeter; the oil storage tank is connected with the other end of the oil conveying pipe; the oil temperature heater is arranged on an oil path of the oil pump for sucking oil from the oil storage tank. So that the engine oil in the whole system can be recycled.
Drawings
FIG. 1 is a schematic diagram of the test system of the present invention.
Fig. 2 is an electrical schematic of the test system of the present invention.
FIG. 3 is a flow chart of a testing system of the present invention.
Fig. 4 is a graph of the change in volume versus pressure.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1-3, the system for testing the instantaneous friction torque of the oil pump of the present invention comprises a frequency converter 1, a motor 2, a dynamic torque sensor 3, an oil pump 4, a transient pressure sensor 5, a mass flowmeter 6, an oil delivery pipe 7, an oil storage tank 8, and an oil temperature heater 9, wherein the frequency converter 1 is connected with the motor 2, and the frequency converter 1 can be used for controlling the rotation frequency of the motor 2; the motor 2 is connected with one end of the torque sensor 3 through a coupler; the other end of the torque sensor 3 is connected with the oil pump 4 through a coupler, and the torque sensor 3 can measure the rotating speed and the torque of the motor 2; the motor 2 is controlled by the frequency converter 1 and can indirectly drag the engine oil pump 4 to rotate through the dynamic torque sensor 3 so as to control the rotating speed of the engine oil pump 4; an oil inlet of the oil pump 4 is connected with the oil storage tank 8, and an oil outlet of the oil pump 4 is connected with the mass flowmeter 6; the transient pressure sensor 5 is connected with the oil pump 4, and the transient pressure sensor 5 can measure the pressure of an oil outlet of the oil pump 4 in real time; the mass flow meter 6 is connected with the oil delivery pipe 7, and the mass flow meter 6 can measure the transient flow of the oil outlet of the oil pump 4; the oil delivery pipe 7 is connected with an oil storage tank 8; when the oil is pumped, the engine oil is pumped out from the oil storage tank 8, and then the pumped engine oil flows back to the oil storage tank 8 through the mass flow meter 6 and the oil conveying pipe 7, so that the engine oil is recycled. The oil temperature heater 9 is arranged on an oil suction way of the oil pump.
The test system for the instantaneous friction torque of the oil pump specifically operates as follows:
the frequency converter 1 controls the rotation frequency of the motor 2 so that the rotation speed of the motor 2 can be controlled. The electric machine 2 is connected to the dynamic torque sensor 3 and indirectly drags the engine oil pump 4 to pump oil. The dynamic torque sensor 3 can measure the instantaneous torque of the pump shaft when the oil pump pumps oil. The oil pump 4 sucks oil from an oil storage tank 8, and the oil is heated by an oil temperature heater 9, so that lubricating oil flows through a mass flow meter 6 from an oil outlet and flows back to the oil storage tank 8 through an oil delivery pipe 7. The transient pressure sensor 5 is arranged at the oil outlet of the oil pump 4 and used for monitoring transient pressure fluctuation of the oil outlet of the oil pump 4. The mass flow meter 6 is used for monitoring the instantaneous flow of the oil outlet.
The characteristic equation of the operation of the rotary type oil pump can be approximated by the following expression (1):
Tq＝Tp+Tf (1)
Tq: representing an input torque;
Tp: a torque representing a pressure difference between adjacent working chambers of the inner rotor;
Tf: representing the instantaneous friction torque at the time of meshing contact of the inner and outer rotors.
In the expression (1), TqAnd TpAll known, can be found by the above-mentioned related instruments or by combining the related parameters of the oil pump, we finally require that T isf。
TpCan be calculated by the following equation (2):
L1: indicating the tooth height of the inner rotor;
b: indicating the tooth thickness of the inner rotor;
Δ p: indicating the pressure difference between adjacent working chambers of the inner rotor;
r: representing the radius of the inner rotor root circle.
The change of the volume of the lubricating oil with the pressure under normal operating conditions of the positive displacement oil pump is shown in fig. 4.
Two adjacent working chambers P can be calculated1And P2I.e., Δ p. PoutOutlet pressure and its corresponding volume VoutCan be measured by transient pressure sensors and mass flow meters. PinThe inlet pressure is atmospheric pressure, corresponding to VinAre known. Volume V1And V2Can be obtained by calculating relevant parameters of the inner rotor. P1This can be calculated from the following equation (3):
by the same method, P can be obtained2Then, Δ P ═ P can be obtained1-P2. Finally, the instantaneous friction torque T can be determined by the expression (1)fThe size of (2).
Claims (1)
1. The test method of the test system of the instantaneous friction torque of the oil pump comprises a frequency converter (1), a motor (2), a dynamic torque sensor (3), the oil pump (4), a transient pressure sensor (5), a mass flowmeter (6), an oil delivery pipe (7), an oil storage tank (8) and an oil temperature heater (9), and is characterized in that: the frequency converter (1) is connected with the motor (2); the motor (2) is connected with one end of the dynamic torque sensor (3) through a coupler; the other end of the dynamic torque sensor (3) is connected with the oil pump (4) through a coupler; an oil inlet of the oil pump (4) is connected with an oil storage tank (8), and an oil outlet of the oil pump (4) is connected with a mass flow meter (6); the transient pressure sensor (5) is connected with the oil pump (4); the mass flowmeter (6) is connected with the oil delivery pipe (7); the oil delivery pipe (7) is connected with the oil storage tank (8); when the oil is pumped, the engine oil is pumped out from the oil storage tank (8), and then the pumped engine oil flows back to the oil storage tank (8) through the mass flow meter (6) and the oil delivery pipe (7); the oil temperature heater (9) is arranged on an oil suction oil path of the oil pump;
the method comprises the following steps:
the frequency converter (1) controls the rotation frequency of the motor (2) so that the rotation speed of the motor (2) is controllable;
the motor (2) is connected with the dynamic torque sensor (3) and indirectly drags the engine oil pump (4) to pump oil;
the dynamic torque sensor (3) measures the instantaneous torque of a pump shaft when the oil pump pumps oil;
the oil pump (4) sucks oil from the oil storage tank (8), and lubricating oil flows through the mass flow meter (6) from an oil outlet and flows back to the oil storage tank (8) through the oil delivery pipe (7) after being heated by the oil temperature heater (9);
the transient pressure sensor (5) is arranged at the oil outlet of the oil pump (4) and monitors transient pressure fluctuation of the oil outlet of the oil pump (4);
the mass flow meter (6) monitors the instantaneous flow of the oil outlet;
the oil pump is a rotor type oil pump, and the characteristic equation of the work of the rotor type oil pump is approximated by the following expression (1):
Tq＝Tp+Tf (1)
Tq: representing an input torque;
Tp: a torque representing a pressure difference between adjacent working chambers of the inner rotor;
Tf: representing the instantaneous friction torque when the inner rotor and the outer rotor are in meshed contact;
in the expression (1), TqAnd TpAre all known;
Tpcalculated by the following equation (2):
L1: indicating the tooth height of the inner rotor;
b: indicating the tooth thickness of the inner rotor;
Δ p: indicating the pressure difference between adjacent working chambers of the inner rotor;
r: represents the radius of the inner rotor root circle;
under the normal working condition of the oil pump, two adjacent working cavities P1And P2Is Δ p; poutOutlet pressure and its corresponding volume VoutMeasured by a transient pressure sensor and a mass flowmeter; pinThe inlet pressure is atmospheric pressure, corresponding to VinIs known, volume V1And V2Obtained by calculating relevant parameters of the inner rotor, P1This can be calculated from the following equation (3):
by the same methodP2Then, Δ P ═ P can be obtained1-P2(ii) a Finally, the instantaneous friction torque T is obtained through the expression (1)fThe size of (2).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910387180.6A CN110131150B (en) | 2019-05-09 | 2019-05-09 | System and method for testing instantaneous friction torque of oil pump |
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| CN201910387180.6A CN110131150B (en) | 2019-05-09 | 2019-05-09 | System and method for testing instantaneous friction torque of oil pump |
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| CN110131150B true CN110131150B (en) | 2020-11-10 |
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| WO2021072653A1 (en) * | 2019-10-15 | 2021-04-22 | 深圳市大疆创新科技有限公司 | Internal rotor assembly testing system and movable platform |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104279153A (en) * | 2014-10-23 | 2015-01-14 | 广西北海玉柴马石油高级润滑油有限公司 | Engine oil pump development system |
| JP5717545B2 (en) * | 2011-05-31 | 2015-05-13 | ダイハツ工業株式会社 | Oil pump torque measurement method and flow rate measurement method |
| CN105157893A (en) * | 2015-05-14 | 2015-12-16 | 山东大学 | Engine instantaneous torque measuring system and method |
| CN205895575U (en) * | 2016-08-18 | 2017-01-18 | 湖南天宏泵业制造有限公司 | A device for water pump moment of torsion speed detection |
| CN206038317U (en) * | 2016-08-29 | 2017-03-22 | 浙江华天机械有限公司 | Engine oil pump test bed |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5717545B2 (en) * | 2011-05-31 | 2015-05-13 | ダイハツ工業株式会社 | Oil pump torque measurement method and flow rate measurement method |
| CN104279153A (en) * | 2014-10-23 | 2015-01-14 | 广西北海玉柴马石油高级润滑油有限公司 | Engine oil pump development system |
| CN105157893A (en) * | 2015-05-14 | 2015-12-16 | 山东大学 | Engine instantaneous torque measuring system and method |
| CN205895575U (en) * | 2016-08-18 | 2017-01-18 | 湖南天宏泵业制造有限公司 | A device for water pump moment of torsion speed detection |
| CN206038317U (en) * | 2016-08-29 | 2017-03-22 | 浙江华天机械有限公司 | Engine oil pump test bed |
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