JPS5937241A - Hybrid engine - Google Patents

Abstract

PURPOSE:To operate an engine always at a minimum specific fuel consumption, by providing combustion pressure sensors in a multicylinder engine, detecting the indicated mean effective pressure of each cylinder, and controlling operation of a motor generator on the basis of the indicated mean effective pressure of each cylinder. CONSTITUTION:Combustion pressure sensors 3 are attached to respective cylinders of a multi-cylinder engine 1 which is connected mechanically with a motor generator 10 via a power mixing means 13, and the outputs of these combustion pressure sensors 3 are supplied together with the output of a crank angle sensor 2 to a control circuit 6 via an amplifier 4 and a Pi-meter 5. The control circuit 6 compares the indicated mean effective pressure of each cylinder given from the Pi-meter 5 with the pre-stored data relating to the relationship between the indicated mean effective pressure and the specific fuel consumption of an engine and controls fuel injection valves 7 and a throttle actuator 9 to keep the specific fuel consumption always at a minimum level. In case that the engine output is not sufficient, the motor generator 10 is operated as a motor by means of a switching circuit 11. On the other hand, in case that the engine output is excessive, the motor generator 10 is operated as a generator.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hybrid engine, and in particular detects the indicated average effective f1- for each cylinder of a multi-cylinder engine, and controls the engine to operate at the minimum fuel efficiency based on this. There are things to do.

Conventionally, in order to improve engine fuel efficiency, power mixing of the output of a multi-cylinder engine and the output of an electric motor generator has been used.
In this method, when the required output is large, the motor-generator is used as a motor using battery power, and when the required output is small, the motor-generator is used as a generator to control the engine. This system stores energy by generating electricity using surplus output and charging the battery, and it is necessary to operate the engine with the lowest fuel efficiency as possible, which requires precise control of each cylinder. It is.

On the other hand, a method using a torque sensor has been proposed for precise control of the engine, but there are problems with the position and space for installing the luxenza, and it has been rejected for practical use in applications such as car warlocks. In addition, in the case of a multi-cylinder engine, since torque is detected for all cylinders in total at 81, precise control of the cylinder ffi is impossible.

The present invention installs a combustion pressure sensor in each cylinder of a multi-cylinder engine, detects the indicated average effective n of each cylinder f, and controls the engine operating state and electric motor g to drive the electric machine based on the indicated average effective n of each cylinder f. The aim is to provide a hybrid engine with high fuel efficiency through precise control.

Embodiments of the present invention will now be described based on the drawings.

Figures 1 and 2 are overall configuration diagrams of 9R113, and 4
A crank angle sensor 2 is attached to the crankshaft of the cylinder engine 1, and the crank angle can be detected by the output pulse of the crank angle pin 1 to 2.
In addition, a combustion pressure sensor 3 is attached to each cylinder, for example, and is integrated with a spark plug, and the combustion pressure can be detected for each cylinder based on the output of the combustion pressure sensor 3. These signals are connected to the input impedance. The output of the Pi meter 5 is amplified by the amplifier 4 and inputted together with the signal of the crank angle sensor v2 to a pi meter 5 for detecting the indicated mean effective pressure (Pi). 6, and the output of the control circuit 6 includes the fuel injection valve 7 of the engine 1, the throttle actuator 9 attached to the intake system power tank 8, and the switching of the electric flI generator 10. A circuit 11 is connected to the motor generator 10, and a battery 12 is connected to the motor generator 10.

Further, the engine 1 and the electric wJ* power generation 1110 are connected to a power mixing device 13 and configured to be taken out as output.

Next, FIG. 3 is a block diagram showing details of the control circuit 6, which includes a microcomputer 14, a microcontroller 91 CPU'>15 that performs various numbing processes, a random access memory (RAM) 16, The characteristic data and control program necessary for control are stored in advance.
Free memory (1 OM) 17, input interface (I
N/IF) 18.19 and output interface (OUT
The output signal of the crank angle sensor 2 is input to the input interface (IN/IF) 19 and the P1 meter 5 via the amplifier 4, and the combustion pressure sensor 1 The output of No. 3 is connected to No. 1 through amplifier 4. ) to the i meter 5, and the output of the pi meter 5, that is, the indicated average effective pressure signal for each cylinder, to the input interface (IN/IF>18), and also to the output interface (OUT/I 1-) 20. The output signal t is transmitted to the fuel injector 7 via the output buffer 16.
, slot] ~ actuator 9 and 1,7J switching circuit 1
1.

Here, the indicated mean effective pressure P i, which is the output of the Pi meter 5, is calculated from the two cylinders 1 as shown in the acupressure diagram in FIG.
In the recycle, the part (S2) surrounded by the line indicating the in-cylinder pressure from the exhaust stroke to the intake stroke is a negative output relative to the engine output, and is the in-cylinder pressure from the compression stroke to the explosion stroke. is shown with one line lI]1j, leda part (
SL) is the engine output plus '34 siT,
The average pressure during one engine cycle is expressed as indicated mean effective pressure Pi = 8+ -32/Vh (Vh is stroke volume), where J is the crank angle and combustion pressure for each cylinder, and Pi meter] IJ ( It is configured to perform performance processing and output (
Vru.

Note that the 1<)res signal output from the crank angle sensor 2 is expressed as (D: cylinder diameter, ": crank radius, λ: connecting rod,
Crank radius ratio) If the signal is output every time the volume changes as expressed by equation (1) above (for example, the stroke volume for -cycle 720° is divided into 100), then this signal is used as the signal for the rimbling. The timing signal is used as the indicated average j effect... (2) As shown in equation (2) above, each of the four strokes in one cylinder cycle, the explosion stroke, the exhaust (j culm, the intake stroke, and the It is possible to calculate the value by adding or subtracting it for each stroke, and the intercostal space required to calculate the indicated mean effective pressure Pi can be shortened.

Therefore, the control circuit 6 compares the indicated mean effective pressure (Pl) for each cylinder with the indicated mean effective pressure to fuel efficiency characteristic data stored in advance in the microcomputer 14, and compares the indicated mean effective pressure (Pl) for each cylinder with the indicated mean effective pressure to fuel efficiency characteristic data, and determines whether the engine is always at the minimum. It issues a control output so that the engine is operated at the fuel efficiency rate, commands the engine's fuel injection valve 7 and the valve actuator 1-9, and also controls the required output on the load side under various operating conditions. When the output of the engine 1 is Saturn, switching control is performed via the switching circuit 11 that switches between the motor and the generator as shown in FIG. backs up the carrot output, and if the output of the engine 1 is excessive, the switching circuit 11 switches the motor/generator '10 to the power generator 111.
It is made to act as 0B and store surplus energy in the battery 12 in preparation for the next output Saturn.

Next, Fig. 5 shows an example of a control program for the microcombigo engine 14. Fig. 6 shows the engine 1's 1-lux, fuel consumption rate, and motor/generator 10 operated as an electric motor. Graph 1 shows the maximum torque characteristics of the electric motor 10A when
The microcomputer 14 stores the engine speed and torque as shown in FIG. 6 and the indicated mean effective pressure (Pi) for each cylinder.
The data map replaced with ``P1'' is stored in advance, and the throttle actuator 9 is controlled so that the indicated mean effective pressure (Pl) that always minimizes the fuel consumption rate for all engine speeds is obtained.

In step 3o of the flowchart in FIG. 5, the engine 1 output (P5 ) is less than rOJ, in step 31 the throttle opening (θt
h) - When operating the engine 1, the electric motor 1 should be controlled.
Activate 0A.

That is, as shown in Fig. 7-a, when the engine 1 is rotating at the minimum fuel consumption rate point and the required output is insufficient, the electric power is
The machine has a backup power of 10Δ output.

On the other hand, as shown in Fig. 7-b, the judgment at step 3° (
If the output obtained by subtracting ε is less than 1°O, then in step 32 carrot 1 is corresponds to the minimum 'MF [required output 1 while rotating with raw fish] o, but both electric power i! 1 machine power generation) Number 10 power generation (number 1
A state in which the generator 10B is driven as 0B, converted into electrical energy, and stored in the battery 12 is shown.

As described above, the present invention includes a multi-cylinder engine, a motor generator, an output of the multi-cylinder engine and a motor generator,
In a hybrid engine consisting of a power mixing device for controlling the output, a combustion pressure sensor detects the combustion pressure of each cylinder of the multi-cylinder engine, and a crank angle signal is generated in synchronization with the rotation of the crank shirt 1. A crank angle sensor is installed, and a control circuit is installed to control the engine and motor/generator based on these signals. By comparing data stored in advance and showing the average effective pressure-fuel efficiency characteristic shown in Figure 1C, the engine is controlled so that the engine is always operated at the minimum fuel consumption rate, and the engine output is increased relative to the requested output of the load. This is a hybrid engine characterized by a configuration in which the electric generator is switched to an electric motor or a generator depending on the excess or deficiency of the engine.This allows the engine to always rotate at the lowest fuel efficiency even when the load changes. This has the effect of significantly improving fuel efficiency and providing an energy-saving engine.

In addition, the control signal for driving at the minimum fuel efficiency rate uses the indicated mean effective pressure detected for each cylinder, so it has good responsiveness.
This has the effect of allowing precise engine control.

Furthermore, since the output of the amplifier can be set smaller than that of the conventional one, the engine can be made smaller and more spacious.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Figures 1 and 2 are schematic diagrams of the entire hybrid engine, Figure 3 is a block diagram of the control circuit, and Figure 4 shows the correlation between combustion pressure and cylinder volume. 5 is a flow chart, FIG. 6 is an engine characteristic graph, and FIG. 7 is an action diagram. 1...] - Engine 2... Crank angle 3
... Combustion pressure sensor 4 ... Amplifier 5 ... Pi meter 6 ... Control circuit 9 ... Throttle actuator 10 ... Electric substitute valve electric machine 11 ... Switching circuit 12
...Battery 13...Power mixing device representative Patent attorney Tsutomu Sadatsu Figure 4 Upper Figure 5

Claims (1)

[Claims] Taki n] - Njin and Den! I'r controls the output of the motor generator, the output of the multi-cylinder engine, and the motor generator.
A combustion pressure sensor detects the combustion pressure of each cylinder of the multi-cylinder engine, and a crank angle sensor generates a crank angle signal in synchronization with the rotation of the crankshaft 11 throat. 1 and a control circuit for controlling the engine and motor/generator based on these output signals (), detecting the indicated average effective J for each cylinder, and In addition to controlling the engine so that it is always operated at the minimum fuel efficiency rate by comparing it with the data showing the indicated average effective pressure-fuel efficiency characteristic, the electric motor is A hybrid engine characterized by being configured to control switching of a generator to an electric motor or a generator.