WO1991008612A1

WO1991008612A1 - Device for controlling change in idling

Info

Publication number: WO1991008612A1
Application number: PCT/JP1990/001563
Authority: WO
Inventors: Kazuhide Togai; Tetsuro Ishida; Yoshiaki Danno; Yasuki Tamura
Original assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
Priority date: 1989-11-30
Filing date: 1990-11-30
Publication date: 1991-06-13

Abstract

A device for controlling the idling of an engine wherein the amount of generation of electricity is detected based on the field current of a generator, and the generator during idling is controlled with reference to an upper limit of generation greater by a predetermined value than the detected amount or its time average value, in order to prevent the decrease in idling speed due to an increase in the electrical load and to protect the storage battery from overdischarge.

Description

Fine idle rotation fluctuation control device technology

The present invention relates to an engine that drives a generator by an internal combustion engine, and does not generate unpleasant vibrations even if the electric load suddenly increases during idle operation. The present invention relates to an idle rotation fluctuation control device.

The present invention has utility, for example, in gasoline engine vehicles.

Background art

Automobiles are equipped with a night drive that is rotated and driven by an engine to generate power. While the engine is rotating, the electric power generated during the night is supplied to various electric loads, and the battery is charged with sufficient electric power. .

In an alternative evening, when a rotor with a field coil (field coil) is rotated, the stationary equipment is installed in the station. In the evening coil, a three-phase flow occurs. The three-phase alternating current is rectified by a three-phase bridge rectifier formed by six diodes and output as direct current.

The voltage generated overnight is the rotation speed of the rotor and the magnitude of the exciting current (field current) flowing through the field coil. Is proportional to and. Since the voltage to supply various electric loads and charge the battery must be kept constant, the rotation speed increases and the generated voltage exceeds the specified value. When trying to adjust the voltage, the generated current is controlled by adjusting the field current over time.

Regulated light adjusts the value of the field current flowing through the field coil in an alternate night according to the supply current to various loads. . In the transistor-type regulator circuit, the duty ratio of the field current is increased or decreased by the on-off of the transistor circuit. To control the amount of current. In this way, by adjusting the exciting current value in a short period of time, the voltage generated in the alternate night can be adjusted, and the battery can be overcharged or overdischarged. Is prevented from occurring.

In the case of this regulation, the field current flowing through the converter increases as the electric load increases, and the field current decreases as the electric load decreases. To be smaller. Therefore, the torque required to rotate the overnight rotation of the converter is large, the electric load is large, the electric load is large, and the electric load is small. When it gets smaller, it gets smaller.

At this point, if the electric load suddenly increases while the engine of the vehicle is idling, the field current flowing in the evening increases, and the The torque that drives the rotor to rotate in the evening increases sharply, and the rotational speed of the engine decreases. In other words, the rotation of the engine will become unstable and the driver will not be given unpleasant vibrations.

During idle operation, the torque generated by the engine is small, and if the idle rotation speed is set low especially for the purpose of reducing fuel consumption, While the driver may be inclined as described above, the driver must perform special operations during idle operation, not only in the vehicle, but also in the vehicle. Due to the low temperature, it is sensitive to engine noise and rotational fluctuations. In such a case, if the electric load is increased by introducing a cooler or the like, the engine rotation speed decreases, and this decrease in engine rotation speed gives the driver a notice. I understand it very well. Drivers may feel uncomfortable or uncomfortable if they experience a decrease in idle speed, leading to a stall. It is. When engine vibrations occur further, anxiety ゃ discomfort increases.

In view of the above conventional technology, the present invention limits the amount of reduction in the number of revolutions of the internal combustion engine even if the electric load suddenly increases during idle operation, and also reduces the battery. -It is to provide an idle rotation fluctuation control device that prevents the climbing. Disclosure of the invention

The present invention, which solves the above-mentioned problem, is different from the control of the idle speed by the feedback to the intake system, and the engine of the engine is controlled by the engine. Detect idle operation and use this idle For example, the power generated by the generator at the start of operation is detected by detecting the field current as a parameter, and a value that is larger than the detected power by a certain value is larger than the detected power. , Set in advance as the upper limit of the amount of power generation. As described above, if the upper limit of the amount of generated power is set in advance at the start of idle operation of the engine, the electric load increases significantly during idle rotation. In addition, the generation of electricity above a certain value from the amount of electricity generated at the start of idle operation is limited. Therefore, the fluctuation of the torque required for driving the generator is also limited, and the decrease in the idle speed is suppressed to a small extent. In addition, the amount of power generation is guaranteed up to the upper limit. Therefore, when the electric load is slightly increased, there is no fear of overdischarge of the battery (above the battery). The amount of decrease in the idle speed corresponds to the difference between the upper limit and the amount of power generation at the start of idle operation, that is, the predetermined value. Therefore, the predetermined value for determining the upper limit does not cause unpleasant vibrations that the driver feels even if the engine speed is reduced. The value should be a value that can secure the “allowable minimum rotation speed” of the order.

The upper limit of the amount of power generation does not necessarily have to be constant during idle operation, and thereafter, the upper limit is gradually increased, or the upper limit of the electric load after that is increased. It is hoped that it will gradually decrease as the load decreases.

If the upper limit value initially set during idle operation gradually increases thereafter, even if the electric load increases, the idle The number of revolutions does not suddenly drop sharply, and the control of the intake system by the field back prevents the number of idle revolutions from decreasing. In addition, since the upper limit gradually increases, for example, even if the idle operation continues for a long time and the electric load during that time becomes considerably large, The time to limit the amount of power generation is shortened, and there is no need to worry about raising the battery.

If the electric load gradually decreases with the decrease of the electric load after the set upper limit value during idle operation, the electric load will decrease once after the electric load has decreased significantly. Even if there is a substantially large increase in the electric load, such as when returning to the electric load at the start of idling operation, the sudden increase in the amount of generated electricity is limited. . Therefore, a decrease in the idle speed is suppressed to a small extent.

From the above, the idle rotation fluctuation control device of the present invention includes an engine, a generator driven by the engine, and a generator that is driven by the engine. A power generation parameter detection means for detecting a parameter representative of the actual field current of the engine, a means for detecting the idle operation of the engine, and When the engine is operating in idle mode, the upper limit of the power generation is set to a value that is larger than the power generation indicated by the detected parameter by a certain predetermined value. And a field current limiting means for limiting the field current of the generator in accordance with the set upper limit value.

Preferably, the power generation parameter detecting means sets the ratio of the field current to the full power generation of the power generator as a parameter. It is a means of detecting Further, the above-mentioned parameter is set as an on-off duty of the field current. In addition, the above parameter is a time average of the on- and off-duties of the current and past field currents. More preferably, the above-mentioned power generation parameter detecting means performs the on-off duty primary filter processing of the field current to set the parameter. It is a means of seeking. Further, the above-mentioned power generation parameter detection means includes an on-off duty of the field current which has been subjected to the primary filter processing this time, and a primary filter for the previous time. This is a means for comparing the processed field current with a value obtained by adding a certain value to the on-off duty and setting a smaller one as a parameter. Still more preferably, the upper limit value setting means includes a field current duty detected by the power generation parameter detection means as a parameter. Is set as the upper limit value, and the above-described field current limiting means sets the field current of the generator below the set duty. Restrict the duty of one. Brief explanation of drawings

Fig. 1 is a block diagram showing the electrical system of a gasoline engine vehicle to which the present invention is applied, and Figs. 2 and 3 are flow charts showing the operation of an embodiment of the present invention. Fig. 4 shows the relationship between the parameters that determine the upper limit of the amount of power generation, and Fig. 5 shows the drive system of the gasoline engine vehicle. Figures 6, 6, 7, and 8 show the FR terminal duty and the G terminal grounding duty. FIG. 9 is a characteristic diagram showing a relationship between an alternator driving torque and an FR terminal duty 1 and FIG. 9 is a characteristic diagram showing a relationship between the FR terminal duty 1.

Best mode for carrying out the invention

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 shows the electrical system of the drive system of a gasoline engine vehicle to which the present invention is applied, and Fig. 5 shows the drive system.

As shown in FIG. 5, air is supplied to the engine 1 through the air cleaner 2 and the air supply pipe 3. A throttle valve 4 is installed in the middle of the air supply pipe 3, and is linked to an accelerator pedal (not shown) to be connected to the throttle valve 4. Opens and closes. During idling operation, the slot notch valve 4 is fully closed, and this fully closed state (idling operation state) is the idling switch 5 Is detected. No, no. The pipe 6 connects the distillation side and the downstream side of the air supply pipe 3 so as to bypass the throttle valve 4. Bayno. A needle valve (no-pass valve) 8 urged by a compression coil panel 7 is provided in the pressure pipe 6, and a solenoid valve 9 is provided. The bypass pipe 6 is opened and closed by the needle valve 8 by the tape drive.

On the other hand, the alternator 10 was rotated and driven by the engine 1 to generate power, and transmitted power to the various electric loads 11. Then, the battery 12 is charged with the surplus power. The battery 12 supplies electric power to the electric load 11 when the power generated by the alternator is insufficient or no power is generated. In addition, the desk angle sensor 13 is provided on the evening of the distribution view 13.

The electronic control unit 15 receives detection signals from sensors such as the idle switch 5 and the crank angle sensor 14 and receives a detection signal from the sensor. 9 and control devices. It also plays a central role in control when implementing the invention.

Next, the electrical system will be described with reference to FIG. As shown in the figure, the alternator 10 is composed of a generator 10-1 having a stationary coil SC and a field coil FC and a generator 10-1. The rectifiers 10-2 formed by a diode and the 10-3 regulators are the main components. Depending on the voltage of the battery 12 and the used electric load capacity, the field regulator FC By changing the duty ratio of the field current flowing through the motor, the power generation current value by the power generation unit 101 is adjusted. In other words, when the battery voltage drops or the electrical load capacity used increases, the duty ratio is increased to increase the generated current, In the opposite situation, adjustment is made to lower the duty ratio and reduce the generated current. Then, the duty ratio of the field current flowing through the field coil FC Is detected by the electronic control unit 15 via the FR terminal at a certain period. Also, according to the command of the electronic control unit 15, the G terminal of the regulator 10-3 is grounded through the control unit 16 via the control unit 16. When this is done, the field current flowing through the finned coil FC becomes zero, the generated current becomes zero, and the generated power is cut. Note that the regulators 10-3 adjust the duty ratio according to the battery voltage and the electric load capacity used. There is also a regime that adjusts the duty ratio based only on the electric load capacity used without referring to the regulations.

In FIG. 1, reference numeral 17 denotes an ignition switch, and reference numeral 18 denotes a charge lamp.

Next, the basic technology that supports the embodiment of the present invention will be described with reference to FIGS. 6 to 9. FIG.

6 to 8 show the relationship between the FR terminal duty 1 and the G terminal grounding duty. The FR terminal duty 1 indicates the duty ratio (conductivity) of the field current detected at the FR terminal. When the field current that is actually flowing is continuous, the FR terminal duty ratio becomes 100%, and the frequency is reduced to the field coil FC. When no field current is flowing, the duty ratio of the FR terminal becomes 0%. The FR terminal duty is equivalent to the power generation rate (for the full power generation amount) in the evening. The ratio of the actual power generation). The G terminal grounding duty indicates the rate at which the G terminal is grounded.If the G terminal is continuously grounded, the G terminal grounding duty is 100%. In other words, the G terminal must not be grounded all over, and the G terminal ground duty will be 0%. When the G terminal is grounded as described above, the power generation is forcibly cut off regardless of the control state of the regulator 10-3.

Fig. 6 shows the characteristics when the regulators 10-3 are allowed to generate 100% power, and the G terminal ground duty is lowered. In particular, the FR terminal duty (power generation rate) increases, and it can be seen. Fig. 7 shows the characteristics when the power generation rate is limited to 50% for Regula 10 / -3, and the G terminal duty is 50% or less. However, it can be seen that the duty ratio (power generation rate) of the FR terminal should not exceed 50%. Fig. 8 shows the characteristics when the regulator is limited to 25% of power generation at night, and the G terminal grounding duty is reduced to 75%. Even in the following cases, it is clear that the duty ratio of the FR terminal (power generation rate) should not exceed 25%. If you control the G terminal grounding duty or the non-grounding duty of the G terminal and the opposite, control the FR terminal. It is possible to control the maximum value of the duty (power generation rate). " Immediately, you can set an upper limit for the amount of power generated Fig. 9 shows the relationship between the duty of the FR terminal (power generation rate) and the driving torque required to rotate the alternator. It can be concluded that "the FR terminal duty (power generation rate) is one-to-one in relation to the alternative driving tonnole".

From the conclusions obtained from Fig. 6 or Fig. 9, the following findings were clarified. Immediately, when the electric load increases, the power supply is generally controlled so that the power generation rate is increased, and when the power generation rate is increased, the overnight drive is performed. The torque rises (see Fig. 9), which reduces the engine speed during idling and causes unpleasant vibrations. Therefore, at the time of idling, the upper limit of the power generation rate should be limited by the G terminal grounding duty or the opposite non-grounding duty. However, if the torque of the drive over the alternatives is restricted, the engine speed will be lower than a certain speed (see Fig. 6 to Fig. 8). Rather, doing so will not cause any more unpleasant vibrations. Also, if the upper limit is set to a high value, the driver can be notified that the engine speed has decreased even if the electric load suddenly increases during idling. It doesn't make you realize. If the power generation rate is limited, the power will be insufficient for the sudden increase in electrical load, but this shortfall will be covered by the battery.

Next, the electronic control unit 15 becomes the center of control. An embodiment of the idle rotation fluctuation control according to the present invention will be described with reference to FIGS. 2, 3, and 4. FIG. Figures 2 and 3 show the flow of operation, and Figure 4 explains the upper limit.

The explanation here is based on the assumption that the power generation is controlled by the non-grounded duty (DG) of the G terminal.

Between to have you in the second figure, also saw Thailand Ma interrupt Ri by the click run-click Pulse interrupt the picturesque down-di-down, on-the FR terminal (field current F _r energized) when Is multiplied by the counter in the electronic control unit 15 (step S 1), and when each of the 180 ° signals of the crank from the sensor 14 rises, you a child of the on-mosquito window down actual duty ratio value of the instantaneous field current F _r of the data immediately Chi F _r de-menu Te I chromatography (DFRR) (scan STEP S 2, S 3 ).

DFRR = (F _r O emissions accumulated between the time) Z (between rising time of the click run-click angle 180 ° signal interval)

Basically, doctors use as a detection value of F _r de-menu Te I one (DFRR) Ya field current actual Mizunoto coulometric the percentage soil field current against the full power generation of this To control power generation. However, in the present embodiment, the amount of generated power fluctuates from time to time. Therefore, if it is directly affected by this fluctuation, the load fluctuation will result in a charge / discharge cycle of the battery. To prevent this from being bad, we use ordinary power generation. The average power generation is a simple average over a certain period of time, weighted like a primary filter. Anything is good, such as average.

In the scan STEP S 4, now times the average power generation amount to Table I to the average F _r de-menu Te I over the (DFR i), asked Me Ri by the primary full I Lumpur evening calculation of the following formula I'll. DFR -!! Is Ru Oh in the de-menu Te I first average F _r of the previous times.

DFR i = a-DFR i-1 + (1-a) DFRR

However, is a filter gain, which is 0, α, and 1 and is preferably larger than 0.5, for example, 0.75.

If the idle control is currently being performed by an on signal from the idle switch 5 (step S5), the electronic control unit 15 is switched to the switch. similar STEP S 6 (FIG. 3), Ri Ru order sought by the now-time goals and F _r de-menu Te I one you (DFROBJ i) the formula.

DFROBJ i = minCDFR i, DFR _s -i + yS)

Immediate Chi, now times of the average F _r de-menu Te I over DFR i, the average of the previous times F _r de-menu Te I over DFR i -! Chi the sale of a small amount of / 3 and pressurized example was value in, how to have because small of safety was now times of goals F _r de Interview - shall be the tape I over. The minute amount S is, for example, 0.4%.

If Re only such a A Lee dollar control medium, the goal F _r de-menu tape I one - across the board, shall be the DFR0BJ = 1 0 0% (scan STEP S 7) <and its, In the next step S8, the electronic control unit 15 sets the G-terminal ungrounded duty DG, which defines the upper limit of the amount of generated power, to the field control target duty. As one Request and execute power generation control (step S9).

DG = DFR0B J + ΔG

However, D G ≤ 100%. AG is a predetermined value such as 4%, 10%, etc., which is a small value, and it is an idle solenoid control by the field back to the intake system, so-called The value should be such that ISC (idle speed 'control) can follow. Further, the relationship between the above and A G is / 8, ΔG, for example, / δ is preferably about 10% of ΔG.

In the control described above, as can be seen from the operation of step S8, the upper limit of the amount of power generation (DG ) Increases or decreases, but power generation control may be performed with the upper limit determined at the beginning of idle operation fixed.

Further, in the above-described embodiment, the idle rotation fluctuation control device of the present invention is implemented by using the electronic control device 15, but a dedicated controller is used. The present invention may be implemented, and in such a case, a dedicated controller may be built in the Altane overnight. . In addition, the engine rotation speed may be obtained by multiplying the rotation speed of the alternative evening by a required number.

In addition, the transmission 'select' switch 19 shown in Fig. 1 includes a new transmission as a judgment condition at the start of idle operation. To detect the position of the You may add that the latch switch 20 detects a latch break.

In addition, the upper limit of the amount of power generation was set and changed using the non-grounded duty DG of the G terminal, but the opposite grounding duty may be used. The upper limit of the excitation current of the field coil FC is effectively controlled by adjusting the applied voltage to the S terminal of the storage regulator. Any method that can be set and changed is acceptable.

Industrial applicability

As described above in detail with the embodiment, according to the present invention, even if the electric load suddenly increases during the idle operation, the electric power is generated during the idle operation. Since the upper limit of the electric power generated by the electric machine is set, the torque required to rotate the electric motor does not exceed a certain value. The engine speed does not drop much, and the engine does not produce unpleasant vibrations.

Claims

The scope of the claims

1. An engine, a generator driven by the engine, and a generator that detects a parameter representing the actual field current of the generator. The parameter detection means, the means for detecting engine idle operation, and the detected parameters during engine idle operation are displayed. Upper limit value setting means for setting a value larger than a given amount by a predetermined value as an upper limit value of the generated amount, and controlling a field current of the generator according to the set upper limit value. An idle rotation fluctuation control device comprising: a field current limiting means for limiting the rotation.

2. The above-mentioned power generation parameter detecting means is a means for detecting the ratio of the field current to the full power generation of the power generator as a set of parameters. The idle rotation fluctuation control device according to item 1.

3. The idle rotation fluctuation control device according to claim 2, wherein the parameter is an on-off duty of a field current.

4. The idle rotation according to claim 3, wherein the above parameter is a time average of the on-off duty of the current and past field currents. Fluctuation control device.

5. The above-mentioned generation parameter detection means is based on the primary filter processing of the on-duty of the field current. The idle rotation fluctuation control device according to claim 4, which is a means for determining the rotational speed.

6. The above-mentioned power generation parameter detecting means includes an on-off duty of the field current which has been subjected to the primary filter processing, and a primary filter processing which has been performed previously. Claims are a means of comparing the value obtained by adding a certain value to the on-off duty of the generated field current, and using the smaller value as a parameter. The idle rotation fluctuation control device described in the range [5].

7. The upper limit value setting means adds a predetermined value to the field current duty detected by the power generation parameter detection means as a parameter. The duty factor is set as an upper limit value, and the field current limiting means controls the duty factor of the field current of the generator below the set duty factor. The idle rotation fluctuation control device according to claim 6, wherein the scope of the request is limited.