JPS6170116A - Engine with turbocharger - Google Patents

Abstract

PURPOSE:To effectively eliminate a turbo lag in an engine when it is accelerated by fully opening a throttle, by enabling a quantity of air, introduced from an air introducing passage provided in the upstream of a catalyst, to be adjusted by an output from an acceleration detecting means, temperature detecting means and a pressure detecting means. CONSTITUTION:An exhaust turbine 15, operating a compressor 7 provided in an intake passage 3, is interposed in an exhaust passage 13, and a catalyst device 17 is provided in the upstream of said exhaust turbine 15. The engine acceleration is detected by an acceleration detecting means 501, inlet temperature of the exhaust turbine 15 by a temperature detecting means 503 and inlet side pressure of the exhaust turbine by a pressure detecting means 505. A control means 509, receiving a signal from these detecting means, adjusts a quantity of air introduced from an air introducing passage 507.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a turbocharged engine, and more specifically, a turbocharged engine 1 in which a catalyst device is provided upstream of an exhaust turbo. I'm going to have a second time.

[Prior Art 1] A conventional turbocharger R-11 engine of this kind is, for example, the one shown in FIG.
(Refer to Publication No.-34033). An intake passage 103 connected to the engine body 101 is equipped with a compressor 105 that delivers +J and l air.
The I11 air turbine 107 that drives the
A catalyst device 111 is provided in an exhaust passage 1091 upstream of the exhaust turbine 107, which is installed in the exhaust gas turbine 9.

Then, the air compressed through the compressor 105 reaches the engine body 101 via the intake air 103. on the other hand,
IJt air 111 discharged from the engine body 101 reaches the catalyst device 111 via the exhaust passage 109.

At this point, heat is generated by the catalytic reaction between 02 contained in the exhaust gas and unburned components such as CO1+1C, so the catalyst
IJ on the exit side of 111) Is the degree of air lag on the entrance side +11-? It rises and becomes hotter than at once. Due to this high temperature, the output of the catalyst device 111 [1 side lJI air pressure, that is, 1) 1 air turbine 107 inlet side III air 1 air pressure 7 air rises, and as a result, By keeping the rotation high and reducing the rotation of the turbine, the supercharging effect ψ can be increased.

[Problems with the next technology] However, the conventional turbocharger mentioned above has some effect on constant speed driving. Therefore, in the combustion process (most of Q2 is consumed, 1.t CO1IC etc. are present in the 111 air, but 02 is not included, so the exhaust gas at the time of exhaustion 11)
The rise of the wet turtle in the 111th spirit of Nohishi 1070 is a miracle to the Ming (temple), and it is less than 1 tsubo.
(゛Atsu IJ.

[Objective of the Invention 1] This invention has been made by focusing on [Conventional Art-1], and provides a method for effectively eliminating the tarpaulin lag during full-throttle acceleration without impairing the normalization of air flow in a turbocharged engine. 1
The 12th child is the purpose.

[Structure of the Invention] In order to achieve this object, this 'R, fjl] is equipped with a compressor that forces intake air into the intake passage, and a +71 air turbine that operates this T1 pump is interposed in the 111 air passage, In this turbocharged engine provided with a catalyst device upstream of the 1-no-1 turbine, there is an acceleration detection means 501 for detecting acceleration, and a first-stage warm melon detection stage 503 for detecting the inlet temperature of the exhaust turbine.

The F1 force detection means 50j for detecting the pressure at the inlet side of the exhaust turbine includes an air passageway 507 capable of passing air (to the bleed passageway of the catalyst 'JJ=W'4σ monthly flow), and the acceleration detection means. , the temperature detection hand f9 receives the detection signals of the wave fl and the force detection stage 1 (j makes it possible to adjust the amount of air introduced into the air from the passageway). And so.

[Actual 1 m Example] 1x Below, one example of this invention, IkV/4, will be explained in detail based on the attached drawings.

Figure 1 shows the overall configuration of a turbocharged engine.
The intake air that has passed through the Acry Reach 5 is pressurized by the Aflow Meter 9 and the Intake Vent Ro3 between the Input Reach 7 and the engine body 1. The comparison valve 11 is connected to iQ IJ.

-1, JJi air passage 13 connected to the engine body 1
includes an exhaust turbine 1 that drives the compressor 7;
5 is interposed. A catalyst device 17 is installed in the exhaust passage 13 between the exhaust turbine 15 and the engine body 1,
A pressure detecting means 19 for detecting the exhaust pressure here is installed on the inlet 11 side of the catalyst device 17, and a pressure detecting means 19 for detecting the exhaust pressure here is installed on the outlet 1 side of the catalyst device 17. A drought detection means 21 is attached. Each signal from the temperature detection means 21, the pressure detection means 19 Ji, and the accelerator switch F23 as the acceleration detection means is input to the control means 25. This control means 25
For example, the computer is configured as Myurocomputer C.

] Touch (l) the intake passage 3 between the compressor and the air flow meter 9! The exhaust passage 13 on the upstream side of the device 17 is connected to the air i1! i is possible and h-). This '+ air introduction passage 27 is equipped with an air filter 29 which pumps the air from the intake passage 3 side to the air passage 13 side. A positive displacement pump is used to achieve speed < 1, and is configured to be driven by engine operation.

Air passage 2 between air pump 29 and υ [air passage 13
7 has a quality adjustment button? 31 is installed.

In response to a signal from the control element F425, the air flow control valve 311 is configured to control the amount of air flow by means of an operation 1-low outer coeater 33. Further, a bypass passage 35 that bypasses the T-apon knob 29 is connected to the air introduction passage 27, and a relief valve 37 is disposed in the bypass passage 35. The relief valve 37 opens when the pressure rises due to the flow control valve 31 narrowing the air passageway 27, and the air on the discharge side of the air pump 29 is allowed to escape to the suction side. The relief pressure is set to be higher than the allowable value PG on the exhaust turbine input side. This release of air causes the pressure on the outlet side of n1 to drop, so that the driving energy T of the T bomb 29 can be reduced.

Reference numeral 41 is an actuator for driving an exhaust bypass valve, and reference numeral 43 is an exhaust gas digestion catalyst.

Next, the effect of the above configuration will be explained in step 9 with reference to the flowchart in FIG.
(Step 1), the warm stone detection means 21 detects it! The hot stone TS is lower than the preset allowable flTG (step 203), and the engine exhaust pressure (pressure on the inlet side of the exhaust turbine 15) Ps is also preset 3'
1 volume 161) If lower than G (step 205), 1
The lllt1 means 25 receives these signals from the flow control valve 3.
1 in the valve opening direction (step 207).

The above V1 capacity value TG is based on the catalyst device 17 and the exhaust turbine 15.
This is set to prevent damage to the system due to heat.
Here, ■FQ'';L' is set at 0-900°C.

Therefore, TS≧TO, and in step 209, the flow β series control valve 3] is driven in the closing direction to reduce the air supply ω and prevent the inlet temperature of the exhaust turbine 15 from rising excessively. Evade 1 noru.

In addition, when the engine speed is low, CO reacts, and if the temperature is increased by 1;
Even if the boost pressure is below 6, the engine exhaust pressure may rise when the boost pressure is 11 (λ11), reducing the engine torque improvement effect. In order to prevent this, the flow rate control valve 31 is set to 1+6 Pa, and here it is set to PG -600111ml-4g. Step 209), reduce the 4G of air and eliminate the excessive rise in the inlet pressure of the 47F air turbine 15;

On the other hand, the air on the downstream side of the compressor 7 is forced to flow through the air introduction passage 27 by the ABOMP 29, which is operating while the engine is running. The air is introduced into the air passage 13. The air pumped by the air pump 29 is taken out from the upstream side of the aflow meter 9, so it does not affect the air-fuel ratio control.

The air introduced into the exhaust passage 13 mixes with D1 air and reaches the catalyst device 17. In the catalyst device 17, the introduced air (02) and V [CO, etc. of air corresponding to the total amount of 02 contained in the air undergo an oxidation reaction, and the exhaust gas enters the exhaust turbine 15]
Lending pressure will also increase. Due to this increase in temperature and pressure, the driving force of the exhaust turbine 15 to the compressor 7 also increases, and the supercharging pressure can be increased to 10j/.

Furthermore, when CO is combusted by a catalyst, the exhaust temperature increases by approximately 100°C for every 001% (5°). Determined by the amount of (air).

Therefore, since the amount of CO emitted from the culm close to the fully open h11 speed increases, the flow 1 control valve 31 opens and an amount of air corresponding to this emitted amount is introduced into the tJl air passage 13, so that the catalyst device 17 can effectively React! '-(-:Imbrelli7
It is possible to increase the driving force of the As a result, the supercharging pressure, which conventionally would not increase unless the engine speed decreased, can be reduced even with full-throttle acceleration from the engine's IK rotation range. C5 turbo lag can be improved.

FIG. 3 shows another embodiment. /C Here, the same reference numerals are attached to the same components as in the above-described embodiment to simplify the explanation. In this embodiment, a motor 45 for operating the pump 29 is interposed between the control means 25 such as the air pump 29, and a motor 45 is provided between the control means 25 such as the cupill switch 23 to control the speed 14 at the time of acceleration according to the driver's will. A switch 47 is provided so that the selection can be made freely. In this configuration, the motor l115 is driven only when the accelerator switch 23 is turned on with the switch 47 turned on, and the air pump 29 is activated to pump air.

It should be noted that this invention (1) is not limited to the above-described embodiments. It is better to set h9 constant for the ship corresponding to the rotational speed (Ne).
Please further improve the cash register 2M ability, J〕a-
It is also possible to temporarily store the number of PAs or a table where f (Ne >).

In addition, Tagawa 1"E 1.L of the normal air pump 29, (1
i air passage 13 glass [prevents air jφ flow 1F1j filter;
1 Engine IJI is set high, but if necessary, install a check valve to check the Jl + IV before backflow. In addition, in order to provide the maximum amount of air necessary for combustion of the engine's special When a nozzle is provided at the open end of the air introduction passage 27 to the passage 13, this nozzle can also be used as a fiss.

, 1, 2nd embodiment of Fig. 3 - C1i, Japump 2
9 is not operated by U-l/'I5. The remote switch 23 is ON (at this time the switch
147 is also ON).

[Efficacy of invention! If! ] As described above, according to the present invention, the jl! l! The catalyst device is installed, and the air introduced into the upstream of the catalyst device is controlled depending on the acceleration state of the exhaust turbine intake and the pressure on the inlet side.
By controlling the combustion of O and increasing the pressure on the inlet and inlet side of the exhaust turbine, the driving force of the exhaust turbine is increased to Jp1.
7N1 Sazeru J, because I did it, 1) I applied it all the time from low rotation of the engine without increasing the purification effect of 10
If it is possible to increase supercharging U1- at the engine speed, turbo lag can be improved.

4. Drawings 1; Explanation of Figures 1 to 3 (relating to embodiments of the present invention)
Figure 1 is an overall configuration diagram of the first example of the engine, Figure 2 shows the action of this engine.
Flowchart 1-1 Fig. 3 is an overall configuration diagram of the second embodiment of the turbocharger F engine, Fig. 4 is an overall configuration diagram of a conventional turbocharger equipped engine, and Fig. 5 It is a diagram.

([Display 1 main part on page 4, 1 explanation of symbols] 3...Intake passage 7...Compressor 13...Exhaust passage 1
5... (1) Air turbine 17... Catalyst device 19
... Pressure detection means 21 ... Temperature detection means 23 ... Accelerator switch (acceleration detector P2>= 1
2= Figure 1

Claims (1)

[Claims] In a turbocharged engine including a compressor for forcefully feeding intake air into an intake passage, an exhaust turbine for operating the compressor interposed in the exhaust passage, and a catalyst device provided upstream of the exhaust turbine, an acceleration detection means for detecting acceleration; temperature detection means for detecting the inlet temperature of the exhaust turbine; pressure detection means for detecting the pressure at the inlet side of the exhaust turbine; and an air introduction passage that communicates with the exhaust passage upstream of the catalyst device and is capable of introducing air. A turbocharged engine characterized by comprising: control means capable of adjusting the amount of air introduced from the air introduction passage in response to detection signals from the acceleration detection means, temperature detection means, and pressure detection means.