JPS638811Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an internal combustion engine, and more particularly, to an internal combustion engine that reduces fuel consumption and improves acceleration performance.

Generally, in a water-cooled internal combustion engine, a water pump circulates cooling water inside the cylinder and cylinder block to cool the engine to an appropriate temperature, and a cooling fan is installed at the front of the engine. This allows the cylinder and cylinder block to be cooled from the outside.

However, in conventional internal combustion engines, the water pump and the cooling fan are connected to the crankshaft via a V-belt and are constantly rotated by the rotational force of the engine. The water pump circulates cooling water to cool the engine. As is well known, an internal combustion engine cannot operate steadily unless it reaches an appropriate temperature. Therefore, in a conventional internal combustion engine, the water pump is used to cool the engine even when the engine is idling, for example, in order to bring the engine to an appropriate temperature.

On the other hand, the cooling water temperature for steady engine operation has a defined range, for example 80°C to 90°C, and even during steady driving, the cooling water temperature is almost always within the above range. The upper limit set temperature is rarely reached. Therefore,
Even during steady driving, it is not necessary to run the water pump if the coolant temperature is within the set range, but in conventional internal combustion engines, the water pump continues to run regardless of whether the engine is accelerating or decelerating. Therefore, during acceleration, the engine must bear both the energy necessary for acceleration and the energy for turning the water pump.

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 prevents the water pump from rotating by the driving force of the engine until the engine cooling water temperature reaches a set range, and
Even when accelerating when the cooling water temperature is within the set temperature, the water pump is not rotated by the driving force of the engine, reducing the engine energy required to drive the water pump, and
An object of the present invention is to provide an internal combustion engine that improves the acceleration performance of the engine and reduces fuel consumption by using the energy as energy for acceleration during acceleration.

In order to achieve this object, the present invention connects an engine and a water pump via a clutch, and also provides an upper limit temperature detector and a lower limit temperature detector for detecting an upper limit setting temperature and a lower limit setting temperature of cooling water temperature in the engine. The clutch is configured to connect the engine and the water pump when the coolant temperature reaches a set temperature range, and when the coolant temperature is within the lower and upper set temperature ranges, the accelerator pedal is pressed. The internal combustion engine is characterized in that when the clutch is depressed, the engine and water pump are disengaged from each other.

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

1 and 2, a cooling fan 3 is attached to, for example, the crankshaft of an engine 1, and power from the crankshaft is transmitted to a water pump W by a belt transmission mechanism V. .

On the other hand, a lower limit temperature detector 4 and an upper limit temperature detector 5 are interposed in the cooling water circulation system (not shown). Further, the accelerator pedal 6 is provided with an accelerator detector 7 that detects its operation.

Now, when the clutch 2 is an electromagnetic clutch (hereinafter 2 will be explained as an electromagnetic clutch), the lower limit and upper limit temperature detectors 4 and 5 will be replaced with a lower limit temperature switch (hereinafter 4 will be explained as a lower limit temperature switch) and The upper limit temperature switch (hereinafter 5 will be explained as an upper limit temperature switch) is set, and the accelerator sensor 7 is also set as an accelerator switch (hereinafter 7 will be explained as an accelerator switch).

Here, from the engine 1 to the water pump W
A circuit in which the electromagnetic clutch 2 is used to connect and disconnect the signal will be explained.

Circuit A uses the normally open contacts of the lower limit temperature switch 4 and upper limit temperature switch 5, and arranges them in series to control the lower limit and upper limit temperature switches 4, 5.
When is in the ON state, the electromagnetic clutch 2 is energized and the water pump W is driven by the power of the engine 1.

Further, circuit B uses the normally closed contact of the accelerator switch 7, and arranges the accelerator switch 7 and the lower limit temperature switch 4 in series, so that the cooling water temperature reaches the lower limit of the set temperature when stopping or decelerating. When the lower limit temperature switch 4 is turned ON, the electromagnetic clutch 2 is energized and the water pump W is rotated by the power of the engine 1, and when the cooling water temperature is within the set temperature range, the accelerator is activated. When the pedal 6 is depressed, the electromagnetic clutch 2 is deenergized and the water pump W is started by the engine 1.
I am trying to cancel the power transmission to.

If the cooling water temperature has not reached the set temperature, the lower limit temperature switch 4 is in the OFF state, so circuits A and B are all OFF and the electromagnetic clutch 2 is not excited.

Therefore, the engine 1 will not drive the water pump W regardless of whether the accelerator pedal 6 is depressed until the coolant temperature reaches the set temperature and the engine enters a steady operating state.

When the cooling water temperature reaches the lower limit of the set temperature range, the lower limit temperature switch 4 is turned on.
Circuit B if accelerator pedal 6 is not depressed
The electromagnetic clutch 2 is energized by this. Therefore, the water pump W is actively rotated by the power of the engine 1 to cool the engine 1.

However, if you press the accelerator pedal 6 from this state, that is, if you accelerate, the accelerator switch 7
is turned off, circuit B is cut off, and circuit A is also cut off because the cooling water temperature has not reached the upper limit of the set temperature range, so the excitation of electromagnetic clutch 2 is released. Therefore, water pump W
The power of the engine 1 that was driving the engine is reduced, and this energy can be used to accelerate the engine. Then, when deceleration occurs, that is, when the accelerator pedal 6 is released, the accelerator switch 7 turns ON again and connects the circuit B, so the electromagnetic clutch 2 is energized again and the water pump W is turned on to the engine 1.
The engine rotates more actively to cool the engine 1.

On the other hand, if the cooling water temperature reaches the upper limit of the set temperature while the water pump W is being turned on and off from the engine 1 as described above, the upper limit temperature switch 5 is turned on and the circuit A is connected. ,
Regardless of whether or not the accelerator pedal 6 is depressed, the electromagnetic clutch 2 is energized and the engine 1 is actively cooled by the water pump W.

When the coolant temperature drops and returns to within the set temperature range, power transmission from the engine 1 to the water pump W is canceled if the accelerator pedal 6 is depressed, and if the accelerator pedal 6 is not depressed, the power transmission to the water pump W is canceled. In order to cool the engine 1 by actively driving the water pump W with the power of the engine 1, the electromagnetic clutch 2 is repeatedly engaged and engaged.

As can be seen from the above explanation, when the cooling water temperature has not reached the set temperature or when the cooling water temperature is within the set temperature range and the engine 1 is to be accelerated, the engine 1 of the water pump W Since the drive is interrupted, fuel consumption can be saved accordingly, and the acceleration performance of the engine 1 can be improved.

In the above-mentioned embodiment, an example of control was explained in which the clutch 2 is an electromagnetic clutch, but the clutch 2 may be operated by fluid. In this case, the lower limit set temperature detector 4 and the upper limit set temperature detector 4 are valves that open and close based on temperature detection, and the accelerator detector 7 is replaced by an accelerator pedal 6.
The valves can be opened and closed by stepping on them, and the circuit for each valve can be formed using piping.

As described above, according to the present invention, when accelerating the engine when the cooling water temperature is within the set temperature range, the water pump is separated from the engine power, so the power for turning the engine water pump can be used for acceleration. Therefore, it is possible to save fuel consumption while improving the acceleration performance of the engine.

Furthermore, even when the cooling water temperature has not reached the set temperature, such as when the engine is idling, the water pump is disconnected from the engine power, so fuel consumption can be saved in this state.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
FIG. 1 is an explanatory circuit diagram, and FIG. 2 is a side view of the engine. 1... Engine, 2... Clutch, 4... Lower limit temperature detector, 5... Upper limit temperature detector, 6... Accelerator pedal, W... Water pump.

Claims (1)

[Scope of utility model registration request] The engine and the water pump are connected via a clutch, and the engine is provided with an upper limit temperature detector and a lower limit temperature detector for detecting the upper and lower set temperatures of the coolant temperature, and the coolant temperature is within the set temperature range. The clutch is configured to connect the engine and the water pump when the temperature reaches the lower limit and the upper limit, and when the accelerator pedal is depressed when the coolant temperature is within the range of the lower and upper temperature settings, the clutch disconnects the engine and the water pump. An internal combustion engine characterized in that it is configured to.