JPS6017946B2 - Automotive engine control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automobile engine control device for suitably controlling the ignition timing of a spark ignition engine in conjunction with activation and deactivation of the room cooler in an automobile equipped with a room cooler. .

In general, in cars equipped with a small engine with a displacement of 4 mm, when the room cooler is activated especially when idling, the driving horsepower of the cooler is added, which causes the engine speed to drop, resulting in problems such as poor idling, overheating, etc. cause problems. Therefore, in the conventional technology, in order to prevent the above-mentioned problem from occurring, the operation of the room cooler is detected and the throttle valve of the carburetor is pressed at idle and opened from the normal idle function, thereby reducing the amount of air-fuel mixture supplied. In response to the increased load caused by room coolers, devices were adopted to keep the engine's idle speed at an appropriate level.

However, in order to increase the throttle opening, it is necessary to drive the throttle valve with a special motor such as a vacuum motor, and since this motor is attached to the engine, the mechanism is complicated and costs are high, and installation is difficult. The problem was that it was bad. The present invention has been proposed in view of the above-mentioned problems, and the first one is ``In the vacuum advance angle device of the Dist IJ Viewer, the throttle valve of the capretor is slightly upstream of the fully closed position of the throttle valve. Then, the disboost generated in the boat bored in the wall of the intake passage on the downstream side of the throttle valve is guided to the negative pressure chamber of the vacuum advance device, the negative pressure passage, or the negative pressure chamber. A branch passage that connects the intake manifold negative pressure generated on the downstream side of the throttle valve and introduces it, an on-off valve installed in the branch passage, and a room cooler that detects the operation and issues commands to the on-off valve. The gist of the invention is ``an automobile engine control device characterized by comprising a control device for controlling the engine speed.''

When the room cooler is activated with the throttle valve fully closed, for example when idling, the control device uses the on-off valve to guide the intake manifold negative pressure to the negative pressure chamber of the vacuum advance device through the branch passage. Advance the ignition timing.

This increases the engine output, counteracts the load of the room cooler, and maintains the engine's idle speed at an appropriate level. Therefore, compared to the conventional motor which opens the throttle valve to increase the engine output, it is compact, has a simple structure, and can increase the engine output when the throttle is fully closed at low cost.

In addition, the second invention is ``a vacuum advance device of a distributor, when the throttle valve of the carburetor reaches a predetermined opening degree or more on the slightly upstream side of the fully closed position of the throttle valve, a hole is formed in the intake path wall downstream of the throttle valve. A first negative pressure passage that guides the disboost generated in the installed boat, a second negative pressure passage that introduces the intake manifold negative pressure generated downstream from the throttle valve, and both negative pressure passages selectively A switching valve that connects the negative pressure chamber of the vacuum advance device, and a control device that issues a command to the switching valve to connect the second negative pressure passage to the internal pressure chamber when the operation of the room cooler is detected. The gist of this article is ``An automobile engine control device characterized by the following features.''

Then, when the room cooler is operated with the throttle valve fully closed, the control device operates the switching valve to allow the second negative pressure passage to pass through the negative pressure chamber to advance the ignition timing.
Increase engine power.

The engine rotation stability is maintained in response to the load from the room cooler. Therefore, the same effects as the first invention are achieved.

Furthermore, the third invention provides: ``The vacuum advance device of the distributor is provided in the intake passage wall which becomes downstream of the throttle valve of the carburetor when the throttle valve reaches a predetermined opening degree or more slightly upstream of the fully closed position of the throttle valve of the carburetor. a negative pressure passage that leads the disboost generated in the boat to the negative pressure chamber of the vacuum advance device; a negative pressure passage that is connected to the negative pressure passage or the negative pressure chamber, and is located downstream of the throttle valve when the throttle valve is in the idle position; When the throttle valve reaches a predetermined opening degree or more, a branch passage introduces the control negative pressure generated in a boat bored in the wall of the intake passage upstream of the throttle valve, and an on-off valve installed in the branch passage. , an engine control device for an automobile, comprising a control device that detects the operation of a room cooler and issues an opening command to the on-off valve.

When the throttle valve is in the idle position, negative pressure from the boat is applied to the branch passage, and when the room cooler is activated here, the on-off valve opens and the negative pressure in the branch passage is transmitted to the negative pressure chamber, advancing the ignition timing. The engine output increases and the engine maintains stable operation despite the added load of the room cooler.

Therefore, it has the same effect as the first invention.

Next, each of the above inventions will be explained in detail according to embodiments shown in the drawings. In each figure showing each embodiment, substantially the same parts are given the same reference numerals. In the first embodiment of the present invention shown in FIG. 1, an intake passage 3 formed by a vaporized air 1 and an intake manifold 2 constituting an intake system of an automobile engine (not shown) is moved by an accelerator pedal (not shown). A throttle valve 4 that opens and closes is interposed.

When the throttle valve 4 reaches a predetermined opening degree slightly upstream of the fully open position of the throttle valve 4, a boat 5 is bored in the wall of the intake passage 3 downstream of the throttle valve 4, and the boat 5 opens a negative pressure passage. The negative pressure generated in the boat 5 (hereinafter referred to as disboost) is connected to the negative pressure chamber 9 formed in the vacuum advance device 8 of the distributor 7 through the negative pressure passage 6. When guided, the diaphragm 10 of the vacuum advance device 8 is attracted against the biasing force of the spring 11, and the ignition timing is advanced.

Further, a branch passage 12 is provided to introduce negative pressure (hereinafter referred to as intake manifold pressure) generated in the intake passage downstream of the throttle valve 4, and the branch passage 12 has an on-off valve 13 and an orifice 14 in the middle. It is connected to the middle of the negative pressure passage 6 via the negative pressure passage 6. Note that the branch passage 12 of the negative pressure passage 6
An orifice 15 is interposed between the boat 5 and the position where it closes.

By the way, the on-off valve 13 is a solenoid valve that opens when the solenoid 16 is energized and energized, and closes the biasing force of the spring 17 when it is demagnetized, and the solenoid 16 is connected to the control circuit 10.

The control circuit 100 includes a relay switch 18 , a room cooler drive switch 21 (not shown), and a room cooler drive motor circuit 23 , and a normally open contact of the relay switch 18 is connected in series to the solenoid 16 . are connected in series to switch 21.

Note that 22 indicates a battery.

According to the above-mentioned Yokinari, when the room cooler is stopped, the solenoid 16 is not energized, the on-off valve 13 is closed by the urging force of the spring 17, and only the disboost generated in the boat 5 acts on the vacuum advance device 8. Normal ignition advance is performed.

On the other hand, when the switch 21 is turned on and current flows through the solenoid 20 and the circuit 23, driving the room cooler,
The contact 19 of the relay switch 18 is closed by the excitation of the solenoid 20, the solenoid 16 is energized, and the on-off valve 13 is opened by the excitation force.

In this state, the disorder is guided to the negative pressure chamber 9 via the orifice I5, and the intake manifold negative pressure is guided to the negative pressure chamber 9 via the orifice 14, the branch passage 12, and the negative pressure passage 6. As a result, a mixed negative pressure is generated in the negative pressure chamber 9, which is set by selecting the diameters of the orifices 14 and 15. This mixture member pressure becomes greater than the disboost in operating states other than the high-load operating state where the throttle valve 4 is wide open due to the intake manifold member pressure which becomes a high negative pressure, and the ignition timing is advanced by that amount.

Therefore, according to this embodiment, when the room cooler is driven and the engine output loss increases, the ignition timing is advanced to improve engine combustion, and this combustion improvement covers the output loss. In particular, the engine speed during idling does not change significantly due to driving or stopping of the room cooler, and it is possible to always maintain the engine speed at an appropriate speed.
Furthermore, according to this embodiment, the combustion consumption during idling is lower compared to the conventional device in which the idle function is changed depending on whether the room cooler is driven or stopped. Since the ignition timing is also advanced in the engine, the rate of increase in fuel consumption, which increases by the horsepower loss due to driving the room cooler, is reduced by the improvement in combustibility.By the way, in general, in recent years, spark ignition engines for automobiles For exhaust gas countermeasures, the ignition timing is set to a characteristic that is considerably delayed from the ignition timing that is set with emphasis on output, and the first embodiment is suitable for such an engine. If the ignition advance characteristic due to the strike does not have a sufficient delay, as in the first embodiment described above, depending on the operating condition, if the ignition timing is advanced by applying negative pressure in the intake manifold to the vacuum advance device. Problems such as knocking due to premature ignition and increased emissions of harmful gases such as NOx occur.

The modification of the first embodiment shown in FIG. 2 is suitable for use in an engine in which the above-mentioned problem occurs, and in this modification, the control circuit 100 in the first embodiment is changed from the control circuit 2001. The control circuit 200 includes a switch 18 that detects and closes the operation of the room cooler, a switch 24 that closes when the engine speed reaches a predetermined rotation speed, and a switch 25 that closes when the throttle valve 4 is in a predetermined relationship range. However, the three switches 18, 24 and 25 are connected in series.

In this modification, the switch 24 is activated when the engine speed is near the idle speed, for example, when the engine speed is around the idle speed.
The switch 25 is set so that the throttle valve 4 closes at an idle angle of 13 degrees or less, for example, at an idle angle of 13 degrees or less.

According to the above modification, when the room cooler is operating under extremely light load conditions in the vicinity, including idling, all switches 18, 24, and 25 are closed, and solenoid 16
is energized, the on-off valve 13 is opened, and the ignition timing is advanced.

Therefore, according to this modification, the ignition timing during idling is mainly controlled according to the activation and deactivation of the room cooler, and the idling rotational speed is maintained appropriately.

In the first embodiment, when the throttle valve 4 is in the idle position, the negative pressure inlet of the branch passage 12 is shown by the imaginary line 26 in FIG. When the opening exceeds the throttle valve, it is connected to a boat 26 bored in the wall of the intake passage 3 on the upstream side of the throttle valve, and the control negative pressure generated in the boat 26 is guided to the vacuum advance device 8. Then, since the above-mentioned self-controlled negative pressure has the characteristic that the negative pressure becomes high only in the low load operation region where the throttle valve 4 is opened at a low degree, it will only become high negative pressure when the room cooler is operating in the low load operation region. Advance angle control is performed using the controller pressure.
In the second embodiment of the present invention shown in FIG. 3, a pressure passage 27 that is connected to the board 5 and guides the disk boost, and a negative pressure passage 28 that introduces the intake manifold negative pressure generated downstream from the throttle valve 4. are connected to three negative pressure passages connected to the vacuum advance angle device 8 via a cutoff valve 29.

The switching valve 29 is a solenoid valve that selectively connects the two negative pressure passages 27 and 28 to three negative pressure passages, and is opened and closed by commands from the control circuit 200. That is, when the solenoid 31 is energized and excited, the switching valve 29 causes the spring 32 to
The valve body 33 is displaced upward against the urging force of the negative pressure passage 2.
7 is closed, the negative pressure passage 28 is connected to the negative pressure passage 30, and when the solenoid 31 is de-energized and extinguished, the spring 32
The valve body 33 is displaced downward due to the urging force, and the negative pressure passage 27
is conveyed to the negative pressure passage 30, and the negative pressure passage 28 is closed. Therefore, according to this embodiment, the disboost is normally conducted to the vacuum advance angle device 8 via the negative pressure circuits 27 and 30, and normal advance angle control is performed, and under very light load operation including idling. When the room cooler is operated, the switching valve 29 is operated and the high intake manifold negative pressure is transferred to the negative pressure passages 28 and 30.
The ignition timing is advanced by the intake manifold member pressure.

A third embodiment of the present invention shown in FIG. 4 is a modification of the first embodiment, in which an air cleaner 35 is attached to the upper part of the carburetor 1 from a canister 34 that adsorbs evaporated gas generated in a fuel tank (not shown). An opening/closing valve 37 is provided in the middle of the transpiring gas passage 36 that guides the adsorbed transpiring gas, and a negative pressure chamber 39 of a diaphragm device 38 that operates the opening/closing valve 37 is connected to the negative pressure passage 6 from the passage 4. This is Yokunari.

Note that 41 is a diaphragm to which the valve body of the on-off valve 37 is fixed, and 42 is a spring that biases the on-off valve 37 in the closing direction.

According to the above configuration, when the on-off valve 13 is closed, the disboost generated in the boat 5 acts on the vacuum advance device 8 via the negative pressure passage 6, and also acts on the diaphragm via the negative pressure passage 6 and the passage 40. It also acts on the negative pressure chamber 39 of the device 38,
When the disboost reaches a predetermined value or more, the on-off valve 37, which had been closed by the biasing force of the spring 42, is opened by the suction action of the disboost.

When the on-off valve 37 is opened, the evaporated gas adsorbed in the canister 34 is sucked into the air cleaner 35 through the evaporated gas passage 36 due to the negative pressure generated in the air cleaner 35, and when this evaporated gas flows into the intake passage 3, it is inhaled. The concentration of the mixture increases somewhat.

Incidentally, since the disk boost 5 has a characteristic that the negative pressure is low when the throttle valve 4 is at a low speed, the on-off valve 37 is closed during low engine load operating conditions including idling. By the way, when the room cooler is operated under very light load operation including idling, the on-off valve 13 opens, and the vacuum advance device 8 and diaphragm device 38 receive a mixture of dyspust and high negative intake manifold member pressure. Negative pressure is applied, and the on-off valve 37 is opened by this mixed negative pressure.

Therefore, when the room cooler is operated under very light load operation including idling, the ignition timing is advanced and the evaporated gas is sucked into the intake passage 3 from the canister 34, increasing the mixture concentration. The air-fuel ratio at idle is 1
．． When the air-fuel ratio is set to 4 base degrees, the air-fuel ratio is 12~
The engine output is increased by improving the combustion by advancing the ignition angle and enriching the air-fuel mixture, which compensates for the loss of output due to the operation of the room cooler,
The engine speed is maintained at an appropriate level regardless of whether the engine is stopped.

In the fourth embodiment of the present invention shown in FIG.
In addition, the switching valve 43 has a negative pressure passage 28 for introducing the intake manifold pressure, a negative pressure passage 30 connected to the vacuum advance device 8, and an on-off valve 37 for the evaporated gas circuit 36. A passage 46 is connected to the upstream side via an orifice 45. When the solenoid 47 of the switching valve 43 is energized, the valve body 48 is displaced to the left in FIG. 5 against the urging force of the spring 49, and the negative pressure passage 27 is closed, and the negative pressure passages 28, 30 When the passage 46 is fully opened and the energization to the solenoid 47 is cut off, the valve body 48 is displaced to the right in FIG. At the same time, the negative pressure passage 28 and the passage 46 are closed and cut off.

In the fourth embodiment, when the on-off valve 43 is demagnetized, a disboost acts on the vacuum advance device 8, and the passage 44 also acts on the negative pressure chamber 39 of the diaphragm device 38.
Disboost acts on the evaporated gas through the on-off valve 3.
When 7 is opened, the evaporated gas is sucked into the air cleaner 35 from the evaporative gas passage 36.

On the other hand, when the on-off valve 43 is energized, the intake manifold negative pressure that is conducted to the vacuum advance device 8 through the negative pressure passage 28 is slightly diluted by the evaporated gas sucked through the evaporated gas passage 36 and the passage 46. In this state, the evaporated gas is conducted through the negative pressure passage 30, and a portion of the evaporated gas, which is evaporated by the orifice 45, is sucked into the intake passage 3 through the passage 46 and the negative pressure passage 28. By the way, in this state, the vacuum advance angle counterfeit 8
The aperture of the orifice 45 is set so that the negative pressure generated in the negative pressure chamber is higher than that when the disboost is turned on. Therefore, in this embodiment as well, when the room cooler is operated and the on-off valve 43 is energized in a very light load operating state including idling, the ignition timing is advanced and the evaporated gas flows into the intake passage 3. Inhalation enriches the mixture. Incidentally, in each of the above embodiments, solenoid valves are employed as the on-off valve 13 or the switching valves 29, 43, but these valves may be mechanically or pneumatically controlled valves, and therefore, these valves may be controlled mechanically or pneumatically. In addition to the electrical control circuits 100 and 200, a mechanical or pneumatic control device may be used as a device for controlling the valve.

As is clear from the above, according to the present invention, the reduction in output due to the operation of the room cooler is compensated for by improving the flammability by advancing or advancing the ignition timing and enriching the intake air-fuel mixture. It is stable and an increase in fuel consumption is also prevented. Furthermore, the device of the present invention has a simple mechanism and is excellent in terms of cost, ease of installation, and ease of maintenance.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a first embodiment of the present invention, Fig. 2 is a schematic diagram of main parts showing a modification of the first embodiment, and Fig. 3 is a schematic diagram showing a second embodiment of the invention. , FIG. 4 is a schematic diagram showing a third embodiment of the invention, and FIG. 5 is a schematic diagram showing a fourth embodiment of the invention. 1: carburetor, 2: intake manifold, 3: intake passage,
4: Throttle valve, 5: Boat, 6: Pressure passage, 7: Distributor, 8: Vacuum advance device, 12: Branch passage, 13: Open/close valve, 14, 15: Orifice, 18: Relay switch, 21: Room cooler drive switch, 22
: battery, 24, 25: switch, 27, 28: member pressure passage, 29: switching valve, 30: negative pressure passage, 34: canister, 35: air cleaner, 36: evaporated gas passage, 37:
Opening/closing valve, 38: Diaphragm device, 40: Passage, 43:
Switching valve, 44: passage, 45: orifice, 46: passage,
100, 200: Control circuit. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Scope of Claims] 1. The vacuum advance device of the distributor becomes downstream of the throttle valve of the carburetor when the throttle valve reaches a predetermined opening degree or more slightly upstream of the fully closed position of the throttle valve of the carburetor. A negative pressure passage that guides the disboost generated in a port bored in the wall of the intake passage to the negative pressure chamber of the vacuum advance device, and is connected to the negative pressure passage or the negative pressure chamber and is downstream from the throttle valve. The present invention is characterized by comprising a branch passage for introducing the negative pressure generated in the intake manifold, an on-off valve installed in the branch passage, and a control device that detects the operation of the room cooler and issues a command to open the on-off valve. Automotive engine control device. 2. The vacuum advance device of the distributor is installed in the intake passage which becomes downstream of the throttle valve of the carburetor when the throttle valve reaches a predetermined opening degree slightly upstream of the fully closed position of the throttle valve. a first negative pressure passage that guides the intake manifold negative pressure generated downstream from the throttle valve; a second negative pressure passage that introduces the intake manifold negative pressure generated downstream from the throttle valve; A switching valve that communicates with the negative pressure chamber of the advance angle device, and a control device that issues a command to the switching valve to communicate the second negative pressure passage with the negative pressure chamber when the operation of the room cooler is detected. Automotive engine control device. 3. The vacuum advance device of the distributor is installed in the wall of the intake passage downstream of the throttle valve of the carburetor when the throttle valve reaches a predetermined opening degree slightly upstream of the fully closed position of the throttle valve of the carburetor. A negative pressure passage that leads the disboost generated at the port to the negative pressure chamber of the vacuum advance device; A branch passage, which is interposed in the branch passage, introduces a controlled negative pressure generated in a port bored in the wall of the intake passage on the upstream side of the throttle valve when the throttle valve reaches a predetermined opening degree or more. An engine control device for an automobile, comprising a control device that detects the operation of an on-off valve and a room cooler and issues a command to open the on-off valve.