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Control device for engine with turbocharger

A turbocharger and control device technology, applied in the direction of engine control, machine/engine, engine components, etc., can solve the problems of turbocharger damage, excessive speed rise, etc., and achieve the effect of preventing excessive rotation

Active Publication Date: 2012-07-11
MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if an engine with a turbocharger is used at a high altitude where the air density is low, in order to supply a large amount of air to the engine, the rotational speed of the turbine constituting the turbocharger may be excessively increased, causing damage to the turbocharger.

Method used

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  • Control device for engine with turbocharger
  • Control device for engine with turbocharger
  • Control device for engine with turbocharger

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] figure 1 It is a schematic diagram showing the engine periphery of the control device for a turbocharged engine according to the first embodiment. exist figure 1 Among them, the engine 2 is a four-stroke cycle diesel engine with four cylinders.

[0052] The engine 2 joins an intake passage 8 via an intake manifold 6 and is connected to an exhaust passage 12 via an exhaust manifold 10 .

[0053] A compressor 14 a of the turbocharger 14 is provided in the intake passage 8 . The compressor 14a is coaxially driven with a turbine 14b described later. On the downstream side of the compressor 14 a of the intake passage 8 , an intercooler 16 for exchanging heat with the atmosphere by the supply air flowing in the intake passage 8 is provided. A throttle valve 18 for adjusting the flow rate of supply air flowing through the intake passage 8 is provided on the downstream side of the intake passage 8 from the intercooler 16 .

[0054] In addition, in the intake passage 8, an ...

Embodiment 2

[0113] Regarding the schematic diagram showing the surroundings of the engine of the control device with a turbocharger according to Embodiment 1, since it is the same as that described in Embodiment 1, figure 1 same, quoted here figure 1 and omit its description.

[0114] Figure 6 It is a diagram showing the logic of the control of the fuel injection amount in the second embodiment.

[0115] exist Figure 6 in, with figure 2 The same reference numerals denote the same actions and controls, and their descriptions are omitted.

[0116] In the second embodiment, the estimation method of the turbine rotation speed is different from that in the first embodiment.

[0117] use Figure 6 A method of estimating the turbine rotational speed in Embodiment 2 will be described.

[0118] exist Figure 6 In 61 shown, the atmospheric pressure [kPa] detected by the pressure sensor 38 and the intake air temperature [°C] detected by the temperature sensor 34 are input into the ECU 40,...

Embodiment 3

[0124] Figure 8 It is a diagram showing the logic of the control of the fuel injection amount in the third embodiment.

[0125] exist Figure 8 in, with figure 2 The same reference numerals denote the same actions and controls, and their descriptions are omitted.

[0126] In Example 3, instead of the intake air temperature [°C] used in calculating the intake air volume flow rate 51 in Example 1, the intake air temperature [°C] estimated from the supply manifold temperature [°C] can be used.

[0127] exist Figure 8Here, the ECU 40 passes the intake manifold temperature [° C.] detected by the temperature sensor 28 through the low-pass filter 71 , and at 72 uses a map to obtain the intake air temperature [° C.] from the intake manifold temperature [° C.]. The low-pass filter 71 is used to suppress the influence of the operation pattern on the temperature change of the air supply manifold during transient operation.

[0128] Figure 9 It is a graph showing the relationshi...

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Abstract

Disclosed is a control device for an engine with a turbocharger. The control device is capable of accurately estimating the speed of a turbine without the need for additional components for directly detecting the turbine speed, and, by accurately estimating the turbine speed, is capable of accurately keeping the turbine speed at or below an allowed value to prevent excessive rotation. The disclosed control device for an engine with turbocharger is provided with: a turbocharger having a turbine disposed in an exhaust passage and a compressor disposed in an intake passage of the engine; and a fuel injection amount control means for controlling the amount of fuel injected into the engine on the basis of the operating state of the engine. The aforementioned fuel injection amount control means has a turbine speed estimation means for calculating a turbine speed estimated value from the engine operating state, and when the turbine speed estimated value exceeds a prescribed allowed value, the fuel injection amount is controlled such that the turbine speed estimated value is at or below the allowed value.

Description

technical field [0001] The present invention relates to a control device for an engine with a turbocharger, and more particularly, to a control device for an engine with a turbocharger capable of suppressing the rotational speed of a turbine to an allowable value or less with high precision. Background technique [0002] Conventionally, engines equipped with turbochargers are often used in vehicles, construction machines, and the like. [0003] In the case of such an engine with a turbocharger, if the air pressure is low and the air density is low in highlands, if it is desired to supply the same amount of air to the engine as in the case of lowland use, consider the volume of air supplied to the engine. , then more air needs to be supplied to the engine than in the case of low ground. Therefore, if an engine with a turbocharger is used at a high altitude where the air density is low, in order to supply a large amount of air to the engine, the rotational speed of the turbin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B39/16F02D41/04
CPCF02D41/0007F02D2200/0414F02B2037/122F02B2039/168F02D2200/0406Y02T10/144F02D41/38F02D41/18F02D2200/703Y02T10/12F02B37/12F02B39/16F02D41/04
Inventor 井手和成山田知秀
Owner MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD