FR2874261A1 - Thermal internal combustion engine testing stand has turbocharger lubrication circuit including one branch connecting tank to turbocharger for feeding turbocharger and another branch returning lubrication circuit towards another tank - Google Patents

Thermal internal combustion engine testing stand has turbocharger lubrication circuit including one branch connecting tank to turbocharger for feeding turbocharger and another branch returning lubrication circuit towards another tank Download PDF

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Publication number
FR2874261A1
FR2874261A1 FR0408892A FR0408892A FR2874261A1 FR 2874261 A1 FR2874261 A1 FR 2874261A1 FR 0408892 A FR0408892 A FR 0408892A FR 0408892 A FR0408892 A FR 0408892A FR 2874261 A1 FR2874261 A1 FR 2874261A1
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France
Prior art keywords
turbocharger
tank
branch
lubricant
bench
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Granted
Application number
FR0408892A
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French (fr)
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FR2874261B1 (en
Inventor
Yann Chouisnard
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Renault SAS
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Renault SAS
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Publication of FR2874261B1 publication Critical patent/FR2874261B1/en
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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M15/00Testing of engines
    • G01M15/02Details or accessories of testing apparatus

Abstract

A test stand of an internal combustion engine (1) comprising a turbocharger (2) comprises a turbocharger lubrication circuit, a first branch (31) of which is intended to supply the turbocharger (2) with lubricant, and a second branch (32) is intended to discharge the lubricant from the turbocharger (2) to a bench tank (34).

Description

2874261 1
  Engine test bench comprising a turbocharger.
  The invention relates to a thermal engine test bench comprising a turbocharger.
  Inboard combustion engines with turbochargers also have a lubrication circuit of the engine components. A branch of this circuit is connected to the turbocharger for supplying lubricant bearings in which a shaft connecting the turbine to the compressor is rotatably mounted. The circuit continues with a return branch to the engine crankcase. This crankcase tank is generally connected to a vacuum point of the air intake circuit, to transfer any combustion gases that would have passed into the tank passing between a cylinder and a piston sliding in the cylinder.
  It is found that air pressurized by the compressor passes into the return circuit, depending on the specific characteristics of the turbocharger, the operating point and the possible wear of the turbocharger. The turbocharger 2 shown in section in Figure 1 shows the path of the gas entering the lubricant circuit.
  The turbocharger 2 comprises a turbine receiving exhaust gas and driving a compressor through a shaft 25. The turbine comprises a volute 23 in which the exhaust gas flows under pressure, and a turbine wheel. turbine 23 mounted directly on the shaft 25. The compressor comprises a compressor volute 22 in which circulates air under pressure. A compressor wheel 24 is also mounted directly on the shaft 25. The shaft 25 is rotatably mounted on two bearings 26, 27. The turbocharger 2 has an inlet port 28 for receiving the lubricant in the direction of the arrow F1 and an outlet port 29 for discharging the lubricant. The bearings 26, 27 are supplied with lubricant by internal channels.
  To seal between the volutes 21, 22 and the shaft 25, the shaft 25 has two grooves 251, 253 in which are housed two segments 252, 254. These segments bear against bores through respectively volutes. It can be seen that the seal is not always perfect and that exhaust gases pass along the line F1 between the volute of the turbine 21 and the shaft 25. Likewise, intake air passes between the volute of the compressor 22 and the shaft 25 according to the path of the arrow F2. These gases are found mixed with the lubricant which is discharged through the outlet orifice 29 in the direction of arrow F4.
  The operating conditions of the turbocharger are closely related to those of the engine. The object of the invention is to provide a test bench for evaluating the characteristics of the turbocharger or for varying the operating conditions thereof independently of those of the engine.
  The invention therefore relates to a test stand of an internal combustion engine comprising a turbocharger, characterized in that the bench comprises a lubricating circuit of the turbocharger, a first branch is intended to supply the turbocharger with lubricant from of a bench tank, and a second branch is intended to evacuate the lubricant from the turbocharger to the bench tank.
  Thus, it creates a lubrication circuit of the turbocharger independent of the engine lubrication circuit. The turbocharger lubrication conditions can be changed without affecting the operation of the engine. For example, the nature of the lubricant, its temperature, the lubricant supply pressure or its flow rate can be changed. It is also easier to measure the amount of lubricant consumed by the turbocharger as lubricant passes into the intake air system or the exhaust system.
  Preferably, a third leg is for connecting a tank vent to an engine crankcase for evacuating gases from the bench tank to the crankcase reservoir. The turbocharger return circuit is generally connected to the engine crankcase. By thus connecting the bench tank with the crankcase tank, the conditions to which the turbocharger is subjected in actual operation are reproduced, in particular by transmitting the pressure inside the crankcase tank to the bench tank. In addition, gases that pass from the turbocharger to the bench tank are then discharged to the crankcase.
  According to an improvement, the third branch comprises a flow meter for measuring the flow of gas. It is possible to know the amount of gas passing from the turbocharger to the bench tank, then to the crankcase tank. The knowledge of this flow makes it possible to characterize the turbocharger either in its initial construction or in its evolution during its use.
  The flow meter uses for example a Vortex effect. This type of flowmeter is suitable for the amplitude of its measuring range and low pressure drop.
  Advantageously, a tranquilizer is inserted in the third branch upstream or downstream of the flow meter to dampen gas flow fluctuations in the third branch. This relieves pulsations created either by the turbocharger or by the movement of the pistons in the crankcase.
  In particular, thermal means are inserted into the lubrication circuit. The thermal means allow either to heat the lubricant or to cool, to adjust its temperature. These are, for example, electrical resistors for heating, or a ventilated radiator for cooling.
  According to an improvement, the temperature of the lubricant is measured upstream of the turbocharger and regulated by regulating means acting on the thermal means. Thus, it is possible to choose to impose a temperature of the lubricant supplying the turbocharger. A temperature setpoint can be given either in a fixed manner or according to a law evolving in a programmed manner or as a function of the operating parameters of the engine or the turbocharger.
  Preferably, pumping means are inserted into the first branch to circulate the lubricant.
  Advantageously, the lubricant pressure is measured upstream of the turbocharger and regulated by regulating means acting on the pumping means. Thus, one can choose to impose the supply pressure of the turbocharger lubricant. A pressure setpoint can be given either in a fixed manner, or according to a law evolving in a programmed manner or depending on the operating parameters of the engine or the turbocharger.
  The invention will be better understood and other features and advantages will appear on reading the description which follows, the description referring to the accompanying drawings in which: Figure 1 is a sectional view of a turbocharger, described above; Figure 2 is a schematic view of a test bench 6 according to the invention.
  The test bench according to the invention, as shown diagrammatically in FIG. 2, is intended to test a turbocharger 2 supercharging a combustion engine 1 with internal combustion. The test bench is intended to circulate a lubricant supplying the turbocharger 2 under conditions controlled and independent of the operation of the engine 1.
  The test bench includes a bench reservoir 34 for containing the lubricant. A first circuit branch 31 connects the bank reservoir 34 to the turbocharger to supply the turbocharger with lubricant, while a second branch 32 carries out the return of the lubricant circuit to the bank reservoir 34. A third circuit branch is intended to connecting a vent 35 of the bench reservoir 34 to a crankcase reservoir 11 of the engine 1. The crankcase reservoir 11 is the volume containing the lubricant of the engine 1.
  The first branch 31 of circuit comprises a pump 39 serving as pumping means for circulating the lubricant, an exchanger 37 for cooling the lubricant, and a filter 40. It also comprises a pressure sensor 5 and a temperature sensor 6 for respectively measuring the pressure and temperature of the lubricant upstream of the turbocharger 2. The pump may be of a type to regulate the flow or the pressure of the lubricant. It could also be fixed flow and associated with a controllable pressure regulator inserted in the first branch.
  Heating means 38 are integrated in the bench tank for heating the lubricant. These heating means are, for example, electrical immersion heaters.
  The third circuit branch 33 comprises a flow meter 4 and two tranquilizers 36 upstream and downstream of the flow meter 4. The tranquilizers 36 are for example simple capacities of a predetermined volume. The flowmeter 4 is for example a Vortex flowmeter indicating a volume flow rate Q as a function of a pulsation frequency downstream of a disturbance inserted in the flow of fluid passing through the flowmeter 4.
  The casing reservoir 11 is connected in a manner known per se to a system for suctioning the gases contained in the casing reservoir 11 to discharge them into the intake air circuit of the engine 1. Consequently, this casing reservoir It is usually in depression.
  The test bench also comprises regulation means 7, for example electronic, receiving a pressure information P from the pressure sensor 5 and a temperature information T from the temperature sensor 6. The regulation means 7 act on the pump 39 to regulate the lubricant pressure upstream of the turbocharger 2. They also act on thermal means comprising the heating means 38 and the exchanger 37 for regulating the lubricant temperature upstream of the turbocharger 2. The temperature setpoints and pressure can be predetermined, steadily or in a cycle. In a variant, the regulation means receive information on the point of operation of the engine and generate the instructions according to laws preprogrammed and stored by the regulation means.
  When the bench is in operation, the pump 39 circulates the lubricant in the first 31 and the second branch 32. When the engine is also in operation, gases are returned to the bench tank 34 with the lubricant. The lubricant is decanted into the tank and the gases separate from the lubricant. The gases are sucked through the third branch through the tranquilizers and the flow meter. The tranquilizers dampen pressure pulsations from the crankcase tank or bench tank. It is thus possible to measure the flow rate of gas entering the lubrication circuit at the level of the turbocharger 2.

Claims (9)

  1. Test bench of an internal combustion engine (1) comprising a turbocharger (2), characterized in that the bench comprises a turbocharger lubrication circuit of which a first branch (31) is intended to supply the turbocharger ( 2) lubricant from a bench tank, and a second leg (32) is for discharging the lubricant from the turbocharger (2) to a bench tank (34).
  2. test bench according to claim 1, wherein a third leg (33) is intended to connect a vent (35) of the bench tank (34) to a crankcase tank (11) of the engine (1) to evacuate gases from the bench tank (34) to the crankcase tank (11).
  3. Test bench according to claim 2, wherein the third branch comprises a flow meter (4) for measuring the gas flow.
  4. Test bench according to claim 3, wherein the flow meter (4) uses a Vortex effect.
  5. Test bench according to claim 3, wherein a tranquilizer (36) is inserted into the third branch (33) upstream or downstream of the flow meter (4) to dampen gas flow fluctuations in the third branch ( 33).
  Test stand according to claim 1, wherein thermal means (37, 38) are inserted in the lubrication circuit (31, 32, 34).
  7. Test bench according to claim 6, wherein the lubricant temperature is measured upstream of the turbocharger (2) and regulated by control means (7) acting on the thermal means (37, 38).
  The test bench of claim 1, wherein pumping means (39) is inserted into the first leg (33) to circulate the lubricant.
  9. Test bench according to claim 6, wherein the lubricant pressure is measured upstream of the turbocharger (2) and regulated by regulating means (7) acting on the pumping means (39).
FR0408892A 2004-08-16 2004-08-16 Thermal engine test bench having a turbocharger Expired - Fee Related FR2874261B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0408892A FR2874261B1 (en) 2004-08-16 2004-08-16 Thermal engine test bench having a turbocharger

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0408892A FR2874261B1 (en) 2004-08-16 2004-08-16 Thermal engine test bench having a turbocharger

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FR2874261A1 true FR2874261A1 (en) 2006-02-17
FR2874261B1 FR2874261B1 (en) 2006-10-13

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2179255A2 (en) * 2007-08-14 2010-04-28 Hochschule Darmstadt University of Applied Sciences Arrangement and method for determining the oil consumption of an oil-lubricated machine
US8015810B2 (en) * 2007-05-14 2011-09-13 GM Global Technology Operations LLC Control of turbocharger lubrication for hybrid electric vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU840689A1 (en) * 1979-09-28 1981-06-23 Предприятие П/Я А-1528 Method of service-life and long-duration testing of turbo-generator
SU1310670A1 (en) * 1984-06-22 1987-05-15 Челябинский Филиал Государственного Союзного Научно-Исследовательского Тракторного Института Bench for diagnostic checking of internal combustion engine turbo-supercharger
US4694689A (en) * 1985-03-23 1987-09-22 Ngk Insulators, Ltd. Method and device for spin-testing of turbocharger rotor
DE4223777C1 (en) * 1992-07-18 1993-10-14 Daimler Benz Ag IC engine turbocharger testing - determining mass flow rate of constant temp. air fed to turbine to obtain defined compressor pressure ratio and using high rate to indicate failed charger.
EP0699900A2 (en) * 1994-08-04 1996-03-06 BALANCE SYSTEMS S.r.l. Balancing process and balancing machine for turbosupercharger units in supercharged engines
JPH11257084A (en) * 1998-03-17 1999-09-21 Yanmar Diesel Engine Co Ltd Lubricating unit for turbo charger in internal combustion engine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SU840689A1 (en) * 1979-09-28 1981-06-23 Предприятие П/Я А-1528 Method of service-life and long-duration testing of turbo-generator
SU1310670A1 (en) * 1984-06-22 1987-05-15 Челябинский Филиал Государственного Союзного Научно-Исследовательского Тракторного Института Bench for diagnostic checking of internal combustion engine turbo-supercharger
US4694689A (en) * 1985-03-23 1987-09-22 Ngk Insulators, Ltd. Method and device for spin-testing of turbocharger rotor
DE4223777C1 (en) * 1992-07-18 1993-10-14 Daimler Benz Ag IC engine turbocharger testing - determining mass flow rate of constant temp. air fed to turbine to obtain defined compressor pressure ratio and using high rate to indicate failed charger.
EP0699900A2 (en) * 1994-08-04 1996-03-06 BALANCE SYSTEMS S.r.l. Balancing process and balancing machine for turbosupercharger units in supercharged engines
JPH11257084A (en) * 1998-03-17 1999-09-21 Yanmar Diesel Engine Co Ltd Lubricating unit for turbo charger in internal combustion engine

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Section EI Week 198213, Derwent World Patents Index; Class S02, AN 1982-D6578E, XP002324382, "Accelerated turbogenerator testing - uses raised working temp. for generator elements and for lubricating oil" *
DATABASE WPI Section EI Week 198750, Derwent World Patents Index; Class S01, AN 1987-354709, XP002324383, "IC engine turbo-compressor diagnosis device - uses hydro-seal to degasify oil from turbo-compressor and has a level indicator to fix limitimgh wear of gaskets" *
PATENT ABSTRACTS OF JAPAN vol. 1999, no. 14 22 December 1999 (1999-12-22) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8015810B2 (en) * 2007-05-14 2011-09-13 GM Global Technology Operations LLC Control of turbocharger lubrication for hybrid electric vehicle
EP2179255A2 (en) * 2007-08-14 2010-04-28 Hochschule Darmstadt University of Applied Sciences Arrangement and method for determining the oil consumption of an oil-lubricated machine

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