JPS6143645Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an internal combustion engine equipped with a vacuum source, and more particularly to an internal combustion engine with reduced fuel consumption and improved acceleration performance.

For example, in an internal combustion engine equipped with a vacuum source used in a brake booster or the like, engine rotation is used to drive a vacuum pump of the vacuum source. The vacuum pump sets the vacuum level in the vacuum tank to a predetermined state, and the vacuum tank and the vacuum servo are communicated as necessary to create a negative pressure in the vacuum servo.

However, in conventional equipment, the air inside the vacuum tank is removed by a vacuum pump so that the vacuum level inside the vacuum tank is always around the set vacuum level, and the vacuum level inside the vacuum tank is always higher than the set vacuum level. In such cases, outside air is introduced through the safety valve. Therefore, the vacuum pump is constantly driven by the engine, so when accelerating the engine, the engine bears both the load necessary for acceleration and the load necessary to drive the vacuum pump. Must.

This means that not only acceleration performance deteriorates but also fuel efficiency is poor, making it unsuitable for the energy-saving era.

Therefore, the present invention aims to reduce the driving force of the vacuum pump engine by interrupting the intake process of the vacuum pump when the degree of vacuum in the vacuum tank is within a certain range. When accelerating the engine when the vacuum level is in the middle of the set vacuum range, the vacuum pump's driving force borne by the engine is reduced by interrupting the intake process in the vacuum pump. The purpose of the present invention is to provide an internal combustion engine that improves the acceleration performance of the engine by using the energy used to drive the pump to accelerate the engine, and also reduces fuel consumption.

In order to achieve this object, the present invention connects an engine and a vacuum pump, provides a lower limit negative pressure detector and an upper limit negative pressure detector in the vacuum tank of the vacuum pump, and furthermore, A valve for opening and closing the passage is provided on the intake side of the vacuum tank, and the valve closes the intake side valve when the vacuum level in the vacuum tank is at the upper limit of a set vacuum level range, and The internal combustion engine is characterized in that the valve opens the intake passage only when the accelerator pedal is released when the vacuum level in the tank is within a set vacuum range.

Next, embodiments of the present invention will be described with reference to the drawings.

In the figure, a vacuum pump 3 is connected to, for example, a crankshaft of an engine 1. The intake port 3a of the vacuum pump 3 communicates with the vacuum tank 4, and after the air in the vacuum tank 4 is removed by the vacuum pump 3 to achieve a desired degree of vacuum, the It is intended to be used in brake boosters, etc. Further, a passage 3c of the intake port 3a of the vacuum pump 3 is provided with a valve 2 for opening and closing the passage 3c.

On the other hand, the vacuum tank 4 is provided with a lower limit negative pressure detector 5 and an upper limit negative pressure detector 6 for maintaining the vacuum degree within the tank within a set vacuum degree range. Now, when the valve 2 is a solenoid valve (hereinafter 2 will be explained as a solenoid valve), the lower limit negative pressure detector 5 and the upper limit negative pressure detector 6 are respectively set as a lower limit negative pressure switch (hereinafter 5 is a lower limit negative pressure switch). pressure switch) and upper limit negative pressure switch (6 below will be explained as upper limit negative pressure switch). Further, an accelerator switch 8 is linked to the accelerator pedal 7.
Here, an electric circuit in which the passage 3c is closed when the electromagnetic valve 2 is energized and opened when the energization is removed will be explained with reference to the drawings.

The lower limit and upper limit negative pressure switches 5 and 6 use normally open contacts, and when these switches are arranged in series and the vacuum level in the vacuum tank 4 reaches the upper limit set vacuum level, the solenoid valve 2 A circuit A is provided which energizes the solenoid valve 2 to shut off the passage 3c, and when the degree of vacuum is below the upper limit setting, shuts off the energization of the solenoid valve 2 and opens the passage 3c. Further, a circuit B passing through a lower limit negative pressure switch 5 is provided in parallel with the circuit A. This circuit B
The accelerator switch 8, which uses a normally open contact, is installed in series with the lower limit negative pressure switch 5, and when the accelerator pedal 7 is depressed with the lower limit negative pressure switch 5 closed, circuit B is connected (the solenoid valve 2 is closed), and when the accelerator pedal 7 is released, the circuit B is cut off (the solenoid valve 2 is opened). That is, in circuit B, the vacuum tank 4
Even if the accelerator pedal 7 is depressed when the degree of vacuum inside the vacuum tank has not reached the set lower limit vacuum degree, the solenoid valve 2 opens the passage 3c and operates the vacuum pump 3, and the vacuum degree inside the vacuum tank 4 is set. When the lower limit vacuum level is reached, when the accelerator pedal 7 is depressed, the passage 3c is closed by the electromagnetic valve 2, and the operation of the vacuum pump 3 is interrupted.

Therefore, when the vacuum level in the vacuum tank 4 has not reached the lower limit of the set vacuum range, circuits A and B are cut off, so the solenoid valve 2
is in the open state and the passage 3c is open, so the vacuum pump 3 operates to increase the degree of vacuum in the vacuum tank 4. At this time, even if the accelerator switch 8 is turned on by depressing the accelerator pedal 7, the lower limit negative pressure switch 5 is turned off, so the vacuum pump 3 increases the degree of vacuum in the vacuum tank 4.
When the degree of vacuum in the vacuum tank 4 reaches the lower limit of the set vacuum degree range, the lower limit negative pressure switch 5 is activated.
However, if the upper limit negative pressure switch 6 of circuit A is still in the OFF state and the accelerator pedal 7 is not depressed, the accelerator switch 8 is in the OFF state and circuit B is also cut off, so the vacuum tank 4
The degree of vacuum inside continues to rise. In this way, the degree of vacuum in the vacuum tank 4 increases and when this degree of vacuum reaches the set upper limit vacuum degree, the upper limit negative pressure switch 6 connects the circuit A and closes the solenoid valve 2, thereby closing the passage 3c. Since the vacuum pump 3 is closed, the intake stroke which requires the most force is interrupted, and the engine 1 only has to bear the driving force for running the vacuum pump 3 idly.

However, as mentioned above, when the vacuum level inside the vacuum tank 4 rises within the set vacuum range,
That is, if the accelerator pedal 7 is depressed when the vacuum level in the vacuum tank 4 is between the lower limit and the upper limit of the set vacuum level range, the upper limit vacuum level switch 6 will be set.
Although it is in the OFF state and circuit A is cut off, the accelerator switch 8 is in the ON state and circuit B is connected together with the lower limit negative pressure switch 5 which is already in the ON state, so the upper limit negative pressure switch 6 is connected to the vacuum tank. Even if it is not possible to energize because the degree of vacuum in valve 4 does not reach the set vacuum degree, circuit B will turn on solenoid valve 2.
is operated to close the passage 3c and cause the vacuum pump 3 to operate idly. Therefore, the energy for the engine 1 to guide the vacuum pump 3 into the intake stroke can be used for acceleration, so that acceleration performance can be improved while saving fuel consumption. In other words, even if the increase in the vacuum level in the vacuum tank 4 is stopped when the vacuum level in the vacuum tank 4 exceeds the set lower limit vacuum level and has not yet reached the set upper limit vacuum level, the vacuum level in the vacuum tank 4 The degree of vacuum inside has already reached a usable degree, and what's more, the vacuum level inside tank 4 is mainly
is used when the brake booster is activated (when using the brakes), so the vacuum tank 4 is almost never used when the accelerator pedal 7 is depressed, so when accelerating in such a state Another advantage is that the energy of the engine 1 can be used effectively without putting an extra burden on the engine 1.

Further, in the above-mentioned embodiment, an example of control was explained in which the valve was a solenoid valve, but the valve may be operated by fluid. In this case, make the lower limit and upper limit negative pressure detectors valves operated by negative pressure.
Furthermore, the aforementioned accelerator switch 8, which detects when the accelerator pedal is depressed, is replaced with a valve.
The circuit for each valve may be formed by piping.

As described above, according to the present invention, when accelerating the engine when the vacuum level in the vacuum tank is in the middle of the set vacuum range, the energy of the engine that drives the vacuum pump can be used for acceleration. Therefore, the acceleration performance of the engine can be improved and fuel consumption can be reduced.

[Brief explanation of the drawing]

The drawings are circuit explanatory diagrams showing an embodiment of the present invention. 1...Engine, 2...Solenoid valve (valve), 3
...Vacuum pump, 3a...Intake port, 3c...
...Aisle, 4...Vacuum tank, 5...Lower limit negative pressure detector, 6...Upper limit negative pressure detector, 7...Accelerator pedal.

Claims (1)

[Scope of utility model registration request] An engine and a vacuum pump are connected, a lower limit negative pressure detector and an upper limit negative pressure detector are provided in the vacuum tank of the vacuum pump, and a valve for opening and closing the passage is provided on the intake side of the vacuum pump. and the valve is configured to close the intake-side valve when the degree of vacuum in the vacuum tank is at the upper limit of a set vacuum degree range, and the vacuum degree in the vacuum tank is within the set vacuum degree range. An internal combustion engine characterized in that the valve is configured to open the intake passage only when an accelerator pedal is released.