JPS6185539A - Control equipment for engine supercharger - Google Patents

Abstract

PURPOSE:To minimize the fuel consumption by making the supercharger nozzle area variable, corresponding to the operational conditions. CONSTITUTION:When a signal Pso, which comes from the optimum scavenging pressure operator 107 that receives signals Pmax and T issued from engine detectors 6 and 7 and passing through A/D transducers 104 and 105, and a signal Ps issued from engine detector 5 and passing through an A/D transducer 103, enter a scavenging pressure increase/decrease setting device 106, this setting device 106 compares both signals and them outputs the amount of increment of Ps in the form of a signal DELTAPs. The nozzle area setting device 108, which receives said signal DELTAPs, sets the amount of increment of the nozzle area, DELTAF. The nozzle area adjusting device 3, which receives this set value DELTAF passing through the D/A transducer 101, brings the variable nozzle area of the turbo-supercharger close to the suitable value.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a control device for a turbocharged engine having a variable nozzle area mechanism.

[Conventional technology]

When fuel is injected from a fuel injection valve 12 into air introduced into a cylinder 11 of a diesel engine and compressed to high temperature and pressure, the fuel ignites and explodes, expands, and performs work on the outside. The combustion gas is then discharged from the cylinder 11 and guided to the supercharger nozzle 14 through the static pressure pipe 13. The thermal energy of the exhaust gas is converted into kinetic energy by the nozzle 14, which rotates the turbine 15 of the supercharger and the rotor 16.
to convey to the power. This power rotates the blower 17 of the supercharger, sucks in air, compresses it, and guides it to the scavenging trunk 19. Note that 18 is a diffuser.

This compressed air pressure in the scavenging trunk, that is, the scavenging pressure, is related to the fuel efficiency of the engine, and the optimum scavenging pressure P8 that minimizes the fuel consumption under the engine operating conditions (mean effective pressure Pme and maximum explosion pressure Pmax) is determined. Some things are obvious.

[Problem that the invention seeks to solve]

However, in conventional examples, the nozzle area of the supercharger is often fixed, and the scavenging pressure varies arbitrarily depending on the engine output, ambient conditions such as atmospheric temperature, etc.

Furthermore, even in turbochargers with a variable nozzle area mechanism, the setting of the area (setting of the immediate scavenging pressure) is often done mechanically depending on the output and rotation speed, and the control that minimizes fuel consumption is not carried out. Not known.

An object of the present invention is to provide an engine supercharger control device that detects operating conditions and minimizes fuel consumption.

[Failure to solve the problem]

The engine supercharger control device according to the present invention is configured to minimize fuel consumption by controlling the nozzle area using a computer in a supercharged engine having a variable nozzle area mechanism.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a block diagram of a control device for an engine supercharger. In the figure, 1 is the engine, 2 is the variable nozzle area supercharger,
3 is a nozzle area adjuster, 4 is a nozzle area detector, 5 is a scavenging pressure (hereinafter abbreviated as Ps) detector/detector, 6 is a maximum pressure (hereinafter abbreviated as Pmax) detector, 7 is a shaft torque ( T below
The detector 100 (abbreviated as ) is composed of a computer. KONI/PC 100 is an analog-digital converter (A/D)], 02 to 105, digital-analog converter (D/A) 101, scavenging pressure increase/decrease setting device 106, optimum scavenging pressure calculator 107, nozzle area setting Vessel 1
08, a corrector 109.

Next, the operation of the embodiment described above will be explained with reference to FIGS. 1 to 3.

1) Detectors 5, 6.7 detect state quantities during engine operation, namely scavenging pressure Ps, maximum cylinder explosion pressure PITIX, N-axis torque T
Detect.

2) Various detected values are converted into digital values by analog to digital (A/I) converters 103 to 05 within the computer 100.

3) The optimum scavenging pressure calculator 107 calculates the optimum scavenging pressure (hereinafter abbreviated as P) that minimizes the fuel consumption at that time from Pmax and T. That is, calculate the average effective pressure (hereinafter abbreviated as pme) from T, and calculate PS from the data stored as characteristic values from Pme and Pmax x as shown in Figure 2.
Calculate O.

4) The scavenging pressure increase/decrease setting device 106 compares the detected scavenging pressure P8 with the optimum scavenging pressure PSO, and sets a necessary increment or decrement ΔP3 of P.

5) The nozzle area setter 108 stores the relationship between the nozzle area increment and the scavenging pressure increment shown in FIG. 3, and sets the nozzle area increase/decrease ΔF by inputting the required increase/decrease ΔP8 in the scavenging pressure P8. do.

6) The required increase/decrease ΔF in the nozzle area passes through a corrector 109 and is converted into an analog signal by a digital-to-analog converter 101.

7) The nozzle area adjuster 3 changes the nozzle area of the supercharger 2 according to an analog amount of .

8) The nozzle area detector II detects the nozzle area at this time, and the detected amount is converted into a digital amount by the analog-digital converter 102 and input to the corrector 109.

9) The corrector 109 stores the maximum and minimum values of the nozzle area, and corrects the set amount output from the nozzle area setting device 108 so that it does not exceed the maximum or minimum value, and performs digital-to-analog conversion. Inform the device 101.

Note that Pme is calculated from T in the above explanation, but Pme
me may be calculated from the rack position of the fuel injection pump as is well known, or Pme may be calculated by detecting other ennon state values from which the ennon output can be calculated.

〔Effect of the invention〕

Variable nozzle surface of the present invention! A turbo supercharger with an X mechanism has Pm,
P from the optimum scavenging pressure calculator 107 which received the T signal.

Ps from the signal and the A/D converter from the Ennon detector
When the double signal is input to the scavenging pressure increase/decrease setter 106, this setter 106 compares the two and outputs an increase/decrease ΔP8 signal of P3. The nozzle area adjuster 3 is configured to operate to bring the variable nozzle area of the turbocharger closer to the appropriate value when the set value ΔF is input to the D/A converter. By controlling the nozzle area of the supercharger according to driving conditions, it is possible to bring scavenging pressure close to the optimum value and minimize fuel consumption.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the engine supercharger control device.
Figure 2 shows Pmax/Pm8=C as a parameter.
Figure 3 is a relationship diagram between nozzle area increment ΔF and scavenging pressure increment JP, and Figure 4 is a graph of the conventional turbo supercharger. It is a schematic explanatory diagram. 1... Ennon, 2... Variable nozzle area supercharger, 3
... nozzle area adjuster, 4... nozzle area detector,
5... Scavenging pressure Ps, 6... Road height (explosion) pressure Pma
x17...shaft torque T, 100...computer,
106...Scavenging pressure increase/decrease setting device, 107...Optimum scavenging pressure calculator, 108...Nozzle area setting device, D/A...
・Converter, I...Converter, P.・・Optimal scavenging pressure, Δ
Ps...Increase/decrease in scavenging pressure, ΔF...Increase/decrease in nozzle area,
be...fuel efficiency.

Claims (1)

[Claims] In a supercharged engine with a variable nozzle area mechanism,
An optimal scavenging pressure calculator that calculates the optimal scavenging pressure that minimizes fuel consumption at that time from the maximum explosion pressure signal and engine torque signal, and sets the necessary increment or decrement of scavenging pressure from the scavenging pressure signal and the optimal scavenging pressure signal. A scavenging pressure increase/decrease setting device, a nozzle area setting device that stores the relationship between the nozzle area increment and the scavenging pressure increment and sets the nozzle area increase/decrease by inputting a necessary scavenging pressure increase/decrement signal, and this nozzle. A supercharger for an engine comprising a nozzle area adjuster that changes the nozzle area of the supercharger based on an area increase/decrease signal, and a variable nozzle area supercharger that is controlled to an appropriate value by the nozzle area adjuster. control device.