JPH0240180B2 - TAABOCHAAJANOKAKYUTOKUSEISOKUTEISOCHI - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises passages on the exhaust side and intake side in which a turbine and a compressor of a turbocharger are respectively interposed, and the turbine is rotationally driven by gas flowing through the exhaust side passage. The present invention relates to a turbocharger supercharging characteristic measuring device that measures the flow rate and compression ratio of flowing air.

Conventionally, in this type of device, the supercharging characteristics of the turbocharger are measured with the engine installed by connecting an exhaust side passage with a turbine in between and an intake side passage with a compressor in between to the exhaust port and intake port of the engine. Alternatively, it is common to measure the supercharging characteristics by feeding air heated by a burner or electric heater into the exhaust passage to rotate the turbine. An expensive dynamo is required to absorb the output.

(ii) Because the temperature on the turbine side is over 900℃, gasoline
There is a risk of fire if oil etc. leaks.

(iii) A large number of auxiliary parts are needed to operate the engine, which results in poor workability and requires time and effort to assemble the device.

In the latter case as well, (i) the control mechanism for keeping the flow rate and temperature of heated air to the turbine constant is complicated and expensive;

(ii) To flow high temperature (approximately 800℃) air for a long time,
The equipment's insulation and heat exhaust equipment become complicated, and safety considerations are required.

It is accompanied by other inconveniences.

An object of the present invention is to provide a measuring device that eliminates such inconveniences, and is provided with a passageway on the exhaust side and an intake side in which the turbine and compressor of a turbocharger are interposed, respectively, and the turbine is connected to the exhaust side passageway. In a turbocharger supercharging characteristic measuring device that is rotatably driven by gas flowing through the compressor and measures the air flow rate and compression ratio flowing through the compressor, the upstream end of the exhaust side passage is connected to a compressed air source. The turbine is rotationally driven by compressed air from the air source, and a plurality of sonic nozzles with different settings are provided on the upstream side of the turbine inlet in the exhaust side passage and on the downstream side of the compressor outlet in the intake side passage. The invention is characterized in that the sonic nozzles in both passages are arranged so that the sonic nozzles in both passages are selectively produced in a predetermined combination.

Next, the present invention will be explained with reference to the illustrated embodiments.

In the drawings, reference numeral 1 indicates a measurement case that houses the turbocharger A, and 2 and 3 indicate passages on the exhaust side and intake side in which the turbine T and compressor C of the turbocharger A are interposed, respectively. Connect the inlet of T to the factory air source or other compressed air source 4.
The intake passage 3 is composed of an upstream pipe line 2a connected to the compressor C, and a downstream pipe line 2b whose outlet is opened into the case 1 via a silencer 5. An upstream pipe line 3a whose inlet is opened into the case 1 via the air filter 6, and a downstream pipe line 3b whose outlet is opened into the case 1.
and an upstream pipe line 2a of the exhaust side passage 2.
and a plurality of sonic nozzles 7, 8 with different settings are arranged in the downstream pipe line 3b of the intake passage 3,
The sonic nozzles 7, 8 in both passages 2, 3 are selectively operated in a predetermined combination.

To explain this in more detail, these sonic nozzles 7 and 8 are arranged in parallel in nozzle chambers 9 and 10, respectively, and are selectively activated by opening the nozzles 7b and 8b that are linked to the cylinders 7a and 8a. In this case, the sonic nozzle 7 provided in the exhaust side passage 2 operates to regulate the flow rate of compressed air supplied to the turbine T;
The first sonic nozzle 7 is provided in the third to third sonic nozzles.
-1 is set to a flow rate lower than the exhaust gas flow rate when the engine is installed for measuring the startability of the turbocharger, and the second sonic nozzle 7-2 corresponds to the flow rate of exhaust gas flowing at an arbitrary predetermined rotation speed during supercharging operation of the engine. The flow rate of the third sonic nozzle 7-3 was set to correspond to the exhaust gas flow rate that corresponds to the maximum boost pressure immediately before the start of the waste gate valve.

In addition, a sonic nozzle 8 provided in the intake passage 3
is the resistance on the outlet side of the compressor C when the engine rotational speed is such that the exhaust gas flow rate is set by the first to third sonic nozzles 7-1, 7-2, and 7-3, respectively. three first to third nozzles 8-1, which are operated in conjunction with the respective Sonitz nozzles 7-1, 7-2, 7-3 to set the
8-2 and 8-3.

Thus, the sonic nozzles 7 and 8 in the exhaust side passage 2 and the intake side passage 3 are sequentially switched from the first one to the second and third ones, and the differential pressure flowmeter provided in the intake side passage 3 is activated. 11, the air flow rate CQ flowing into the compressor C, and the pressures CP _{1 and CP 2} on the inlet side and outlet side of the compressor C, the compression ratio ( _{CP 2 /} CP ₁ ) is calculated.
According to this, it is possible to know the supercharging characteristics under various operating conditions by simulating the time when the engine is installed.

In addition, in the diagram, the above data CQ, CP ₁ , CP ₂
In addition to the temperatures CT ₁ and CT ₂ on the inlet and outlet sides of the compressor C, and the pressures on the inlet and outlet sides of the turbine.
TP ₁ , TP ₂ and temperature TT ₁ , TT ₂ , Sonic nozzle 7
Various data such as pressure TP ₀ and _{temperature TT 0} on the upstream side of The device 13 outputs the data to the printer 14, processes the data, and lights up a pass/fail judgment lamp 15 to determine whether the turbocharger can be installed on the intended engine.

In the drawing, 16 is the pressure on the upstream side of Sonic nozzle 7.
A pressure regulating valve operates to maintain TP ₀ at a predetermined pressure according to a command from the pressure regulator 17, and a pressure regulating valve 18 operates to maintain the pressure P _A in the measurement case 1 at a predetermined pressure according to a command from the pressure regulator 19. This shows the pressure regulating valve.

Further, in the drawing, 20 indicates a lubricating oil circulation system of the turbocharger A, in which an oil bun 22 whose temperature is controlled by a temperature controller 21, a pump 23, a regulator 24, a flow meter 25, and a pressure gauge 26 are arranged.

In this way, according to the present invention, the turbine is driven by flowing compressed air through the exhaust side passage, and workability and safety are improved, and the settings are different between the exhaust side passage and the intake side passage. A plurality of sonic nozzles are arranged, and the sonic nozzles in both passages are selectively operated in a predetermined combination to simulate the flow rate to the turbine and the resistance at the compressor outlet side to values corresponding to various operating conditions when the engine is installed. Therefore, the supercharging characteristics of the turbocharger can be measured, and since the sonic nozzle is used, the operation is constant, and accurate supercharging characteristics with high correlation with the time of mounting can be measured.

[Brief explanation of drawings]

The drawing is a system diagram of an example of the device of the present invention. A...Turbo charger, T...Turbine, C
...Compressor, 2...Exhaust side passage, 3...Intake side passage, 4...Compressed air source, 7, 8...Sonic nozzle.

Claims (1)

[Claims] 1. It is provided with passages on the exhaust side and the intake side in which the turbine and compressor of the turbocharger are interposed, respectively,
In a turbocharger supercharging characteristic measuring device that measures the flow rate and compression ratio of air flowing to the compressor by rotationally driving the turbine with gas flowing through the exhaust side passage, the upstream end of the exhaust side passage is driven by compressed air. The turbine is connected to a power source so that the turbine is rotationally driven by compressed air from the air source, and is set respectively at the upstream side of the inlet of the turbine in the exhaust side passage and the downstream side of the outlet of the compressor in the intake side passage. 1. An apparatus for measuring supercharging characteristics of a turbocharger, characterized in that a plurality of sonic nozzles having different characteristics are arranged, and the sonic nozzles in both passages are selectively operated in a predetermined combination.