JPS60169639A - Rotation controller for internal-combustion engine - Google Patents

Abstract

PURPOSE:To cause limited fluctuation of rotation within a narrow range and to reduce the generation of vibration and noise, by a method wherein the rotation speed of an engine with a retarder is detected, and when a rotation speed is increased to higher than a given value during operation at a low speed, a retarder is actuated. CONSTITUTION:A detector 7 for the number of revolutions is mounted to an engine 1 equipped with a retarder unit 5, and a detecting signal therefrom is inputted to an integrating circuit 8 to determine a mean speed. When the means speed is below a first given value, a gate 10 is opened. A signal for the number of revolutions of an engine is inputted through the one input terminal of the gate 10, and when a rotation speed exceeds a second set value, a relay circuit 12 is excited to actuate a retarder 5. This reduces a fluctuation in the number of revolutions.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a rotation control device for an internal combustion engine for an automobile.

In particular, the present invention relates to a rotation control device that controls fluctuations in the rotational speed of an internal combustion engine using the output of a retarder that applies electrical braking to a rotating shaft.

[Description of prior art]

When a car's internal combustion engine is started, it naturally generates vibration and noise. Furthermore, when the vehicle is running, the cabin walls are vibrated due to the vibrations and noise of the internal combustion engine itself, as well as irregularities in the road surface, and the vibrations radiate noise into the cabin.

Such vibrations and noise not only impair livability, but also
These are factors that reduce durability, and efforts are constantly being made to minimize these. There are many causes of vibration and noise, one of which is rotational fluctuations of the internal combustion engine.

This rotational fluctuation often occurs during idling when the normal temperature effect of the flywheel is small, and it is often experienced that it can resonate with the vehicle body and generate large vibrations and noise. As a countermeasure against such problems, conventional methods have been to increase the flywheel's moment of inertia to suppress rotational fluctuations, but increasing the flywheel's moment of inertia too much worsens the acceleration/deceleration performance and torsional vibration of the internal combustion engine. Because of this, there were limits.

[Purpose of the invention]

The present invention detects rotational fluctuations in the internal combustion engine and applies electrical braking in accordance with the rotational fluctuations, thereby reducing the range of rotational speed fluctuations and reducing vibration and noise. The purpose is to provide a control device.

[Features of the invention]

The present invention attempts to utilize a braking retarder installed on the rotating shaft of an internal combustion engine for this purpose, and detects the rotational state electrically and applies braking force intermittently during high-speed rotation due to uneven rotation. It is characterized by enabling and reducing vibration and noise.

That is, the present invention provides an internal combustion engine equipped with a retarder that applies electrical braking to a rotating shaft, including a detection circuit that detects the rotational speed of the rotating shaft as an electrical signal, and a rotation speed represented by the electrical signal detected by the detection circuit. a first comparison circuit that detects that the average value of the speed is less than or equal to the first value; a gate circuit that is turned on by the detection output of this first comparison circuit; and a rotation speed represented by the output electrical signal of this gate circuit. a second comparison circuit that detects that the second value is greater than or equal to a second value smaller than the first value, and a relay circuit that sets the retarder to 9) by the detection output of the second comparison circuit. ,
The feature is that vibration and noise caused by rotational fluctuations of the internal combustion engine can be reduced.

The electrical signal may be an analog voltage signal, and the relay circuit for activating the retarder may be a relay circuit for conducting current in the magnetizing coil of the retarder.

In addition, the present invention promotes warming up by activating a retarder and increasing the engine load during warm-up operation of an internal combustion engine.
This is different from the prior art filed in No. 95147. The difference in structure from the prior art is that, whereas the prior art enables braking continuously, the present invention enables braking intermittently only when the rotational speed is high due to uneven rotation.

[Explanation based on examples]

Next, a control device according to an embodiment of the present invention will be explained based on the drawings.

FIG. 1 is a block diagram of a rotation control device according to an embodiment of the present invention, FIG. 2 is a diagram showing variations in the rotational speed of an internal combustion engine, and FIG. 3 is a diagram showing braking force applied by the rotation control device according to an embodiment of the present invention. FIG. 4 is a diagram showing the rotation speed controlled by the rotation control device according to the embodiment of the present invention.

As shown in FIG. 1, the rotation control device according to the embodiment of the present invention includes a flywheel 3 having the function of a magnetic rotor, which is rotatably mounted on the crankshaft 2 of an internal combustion engine 1, and a flywheel 3 that is rotatable by the rotation of the flywheel 3. It includes a power generation coil 4 that generates a current by changes in magnetic lines of force generated between the wheel 3 and the wheel 3,
Multiple glues for braking vehicles 1-5
The fuel injection pump 6 is also equipped with a detection circuit 7 that detects the rotational speed of the internal combustion engine 1 as an electrical signal.

This detection circuit 7 is connected on the one hand to an integrating circuit 8, which is connected to a comparator circuit 9, which in turn is connected to a gate circuit IO. The detection circuit 7 is also directly connected to the gate circuit 10, and the comparison circuit 9 is supplied with a constant reference voltage 1.

The gate I circuit 10 is connected to a comparator circuit 11, and this comparator circuit 11 is connected to a relay circuit 12 which is operated by its output, and when this relay circuit 12 is operated, a race inochi 13 is closed. The generator coil 4 of the retarder unit 5 is connected so that a current flows from a power source (not shown), and the comparator circuit 11 is connected to a constant reference voltage V.
2 is added.

The operation of the rotation control device according to the embodiment of the present invention configured as described above will be explained. The present invention utilizes a retarder unit that brakes a vehicle, and is characterized by detecting fluctuations in the rotational speed of an internal combustion engine, applying braking when the rotational speed is high, and controlling the amount of fluctuation within a certain range.

In general, at medium speeds and higher speeds, there is little variation in rotational speed.
The amount of variation is greatest at low speeds, especially near idling. Therefore, it is not necessary to control the entire rotational speed range of the internal combustion engine, and the control range is set at the upper limit voltage 1 and the lower limit voltage V2 depending on the model.
This controls fluctuations in rotational speed.

That is, the detection circuit 7 attached to the fuel injection pump 6 of the internal combustion engine 1 detects the rotation speed as an electrical signal,
On the one hand, this electrical signal is manually input to the integrating circuit 8 to become an averaged value and input to the comparing circuit 9. The upper limit voltage V1 of the control range is applied to this comparison circuit 9, the input voltage is compared with this upper limit voltage V1, and when the input voltage is lower, it is output to the gate circuit 10. Conversely, when the input voltage is higher, that is, when the rotational speed is high, there is no need for control and therefore no output is made to the gate circuit 1o.

If there is an output in the gate circuit 10, the output signal is outputted to the comparison circuit 11 since the detection circuit 7 always applies an output signal to the gate circuit 1o. The lower limit voltage v2 of the control range is constantly applied to the comparator circuit 11 that receives this output, and if the input voltage received by the comparator circuit 11 is higher than the upper limit voltage (2), it outputs it to the relay circuit 12. Conversely, when the input voltage is lower, that is, when the rotation speed is low, there is no need for control, and therefore the relay circuit 13
is not output to.

If this relay circuit 12 has an output, a current flows through the relay coil, the relay switch I3 is closed, and a current flows from a power supply (not shown) to the generator coil 4 of the generator unit 5.
It is possible to generate a magnetic field to apply braking to the flywheel 3 and control the rotational speed of the internal combustion engine l.

The operation of the rotation control device according to the embodiment of the present invention will be explained in a supplementary manner using FIGS. 2 to 4. The rotation speed of the internal combustion engine 1 varies with respect to the crank angle as shown in FIG. 2. Assuming that such fluctuations in the rotational speed are to be controlled within the range of the upper limit rotational speed N1 and the lower limit rotational speed N2, the control voltages applied to the comparison circuits 9 and 11 are set to ■1 and v2.

When the control voltage is set in this way, the retarder device
-5, as shown in Fig. 3, braking is periodically applied to the flywheel 3 in response to the fluctuations in the rotational speed shown in Fig. 2, and the rotational speed of the internal combustion engine changes as shown in Fig. 4. The variation range becomes narrower, and rotational variation can be reduced.

The above explanation has been made for an internal combustion engine equipped with a retarder, but even in the case of an internal combustion engine without a retarder, the rotation speed can be controlled by installing a simple retarder device based on the same principle. It is possible.

〔Effect of the invention〕

As described above, according to the present invention, by utilizing the retarder's cooperative braking function, it is possible to control the rotational fluctuations of an internal combustion engine within a narrow range, and the vibrations and noise generated by these rotational fluctuations can be suppressed. It has excellent effects such as reducing the accompanying discomfort, improving IS comfort, and extending the life of the vehicle.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of a rotation control device according to an embodiment of the present invention. Figure 2 is a circle showing variations in the rotational speed of an internal combustion engine. FIG. 3 is a diagram showing the braking force applied by the rotation control device according to the embodiment of the present invention. FIG. 4 is a diagram showing the rotation speed controlled by the rotation control device according to the embodiment of the present invention. ■...Internal combustion engine, 2...Crankshaft, 3...Flywheel, 4...Generating coil, 5...Retarder unit, 6...Fuel injection pump, 7...Detection circuit,
8... Integrating circuit, 9.11... Comparing circuit, 1o...
- Gate circuit, 12... Relay circuit, 13... Relay switch, Vl... Upper limit voltage, V2... Lower limit voltage, N1... Upper limit rotation speed, N2... Lower limit rotation speed. Patent Applicant Hino Motors Hiiragi Shiki Co., Ltd. Representative Patent Attorney Nao Ide Takayoshi 1 mouth

Claims (3)

[Claims] (1) In an internal combustion engine equipped with a retarder that applies electrical braking to the rotating shaft, there is a detection circuit that detects the rotational speed of the rotating shaft as an electrical signal, and a detection circuit that detects the rotational speed represented by the electrical signal detected by the detection circuit. a first comparison circuit that detects that the average value is less than or equal to a first value; a gate circuit that becomes conductive based on the detection output of this first comparison circuit; A second comparison circuit that detects that the second value is greater than or equal to a second value smaller than the first value, and a relay circuit that enables the retarder based on the detection output of the second comparison circuit. A rotation control device for internal combustion engines. (2) The rotation control device for an internal combustion engine according to claim 11, wherein the electric signal is an analog voltage signal. (3) The rotation control device for an internal combustion engine according to claim 1, wherein the relay circuit that enables the retarder is a relay circuit that conducts current in the field coil of the retarder.