JPS58158359A - Auxiliary fuel feeding apparatus for alcohol engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an alcohol engine that operates using alcohol fuel such as methanol or ethanol as the main fuel.
The present invention relates to a device that can supply gasoline fuel as auxiliary fuel to this alcohol engine.

In general, alcohol engine Te1! Due to the characteristics of flucoal fuel (hard to vaporize at low temperatures; large latent heat of vaporization; high flash point, etc.), there is a problem in that low-temperature starting performance is extremely poor.

In winter, various research and development efforts have been carried out to improve the low-temperature starting performance of alcohol engines, but there are various problems in practical application.

The present invention was created under these circumstances, and an object of the present invention is to provide an auxiliary fuel supply device for an alcohol engine, which improves the low-temperature starting performance of the alcohol engine and also improves the warm-up promotion performance. do.

Therefore, in an engine that operates using alcohol fuel as the main fuel, the device of the present invention has a gasoline fuel supply system connected to the intake passage to supply gasoline fuel as auxiliary fuel to the intake passage, and a gasoline fuel supply system connected to the intake passage to supply gasoline fuel as auxiliary fuel to the intake passage. The supply system is equipped with an on-off valve installed in the supply system, as well as a temperature sensor that detects the engine temperature and a cranking sensor that detects the engine cranking state. The present invention is characterized in that a low-temperature start control circuit is provided that can open the on-off valve when the engine temperature is below a predetermined value.

In addition, the device of the present invention further includes another on-off valve in another gasoline fuel supply system, and operates the valve when the engine temperature is below a predetermined value after the engine is started based on a signal from an engine sensor or a temperature sensor. It features a warm-up promotion control circuit that opens.

Below, an auxiliary fuel supply system for an alcohol engine as an embodiment of the present invention will be explained with reference to the drawings. A carburetor 3 is installed in the venturi portion 4 between the portion of the valve 2 and the portion of the choke valve 9.
The nozzle 5 of is open.

Alcohol fuel from the alcohol fuel supply path 8 is supplied to the intake passage 5 from the nozzle 5 while being subjected to fuel pressure adjustment by the float chamber 6.

Note that 7 is a float, 10 is a choke button that operates the choke valve 9 via a choke wire 11, and 25
indicates the air cleaner.

Further, the choke valve 9 may be automatically adjusted.

By the way, one end of the first gasoline fuel supply path 12 is open downstream of the portion of the intake passage 1 where the throttle valve 2 is located.

Further, one end of the second gasoline fuel supply path 13 is open downstream of the portion of the intake passage 1 where the choke valve 9 is located and upstream of the portion where the throttle valve 2 is located.

The other end of each gasoline fuel supply path 12,13 is connected to a gasoline fuel tank 15 via a filter 14, respectively.

In addition, at one end of each gasoline fuel supply path 12.13,
Apertures 12a and 13a are provided, respectively.

In addition, the first and second gasoline fuel supply paths 12.13
have first and second electromagnetic on-off valves 16., respectively.
17 is interposed.

Further, a temperature detection switch 18 is provided as a temperature sensor for detecting engine temperature such as engine cooling water temperature and engine outside temperature.
For example, closes when the engine cooling water temperature is below 40℃,
It is configured as a switch that opens at all other times.

Mata, starter terminal 21a and ignition terminal 21b
A key switch 21 is provided which can selectively close the starter terminal 21.
By setting the key switch 21 to the a side, the engine cranking state can be detected using the key switch 21. Therefore, this key switch 21 is configured as a cranking sensor.

The starter terminal 21a of the key switch 21 is connected to the first
is connected to one end of the solenoid coil of the on-off valve 16, and the other end of this solenoid coil is connected to the temperature detection switch 1.
8 is connected.

Therefore, as can be seen from this figure, the engine temperature is below a predetermined value (for example, the engine cooling water temperature is below 40°C).
If you crank the engine in this condition, battery 2
6. Electricity is supplied through the key switch 21, the solenoid coil of the first on-off valve 16, and the temperature detection switch 18, and as a result, the solenoid coil of the on-off valve 16 of the cylinder 1 is energized, and the first Ganlin fuel supply path 12 is opened. As a result, gasoline fuel can be supplied to the downstream side of the throttle valve serving portion of the intake passage 1.

That is, these batteries 26. Key switch 21.
The solenoid coil of the first on-off valve 16 and the temperature detection switch 18 constitute a low temperature starting control circuit C1.

Furthermore, an engine sensor 2 that detects the engine operating state
0 is provided, and as this engine sensor 20, 1, for example, an output terminal of an alternator is used.

Then, the ignition terminal 21b of the key switch 21
is connected to the input side of the second on-off valve control unit 190, and the output side of this control unit 19 is connected to the temperature detection switch 18 via the second on-off valve 170 solenoid coil.

Further, a signal from the engine sensor 20 is also input to the control unit 19.

This control unit 19&'! If the information from the engine sensor 20 indicates that the engine is stopped, the power to the solenoid coil of the second on-off valve 17 is cut off, and if the engine is running, the engine temperature is below a predetermined value (for example, the engine cooling water temperature is below 40°C). ), this unit includes a switch section that enables energization of the second on-off valve 170 solenoid coil.

Therefore, battery 26. Key switch 21, con'
Troll unit 19. Engine sensor 20. Solenoid coil of second on-off valve 17 and temperature detection switch 1
8 constitutes the warm-up promotion control circuit C2.

The gasoline fuel tank 15 is also provided with a reed switch 24 that closes when the liquid level falls below a predetermined value and opens otherwise. The warning light 23 lights up to remind you to refuel with gasoline.

Since the device of the present invention is configured as described above, the engine temperature is below a predetermined value (for example, the engine cooling water temperature is
(below 0°C).

When the engine is started, temperature detection switch 1
8 is closed, and the key switch 21 is connected to the starter terminal 21.
Since it is tilted toward the a side, the first on-off valve 16 opens the first gasoline fuel supply path 12.

As a result, gasoline fuel is supplied into the intake passage 1 while its flow rate is adjusted by the throttle 12a due to the negative pressure and gravity in the intake passage 1, thereby making it possible to start the engine smoothly.

When the engine starts in this way, key switch 2
1 is the starter terminal 21a and the ignition terminal 21b
Switch to. As a result, the first on-off valve 16 closes the first gasoline fuel supply passage 12, while the second on-off valve 17 opens the second gasoline fuel supply passage 13.

As a result, gasoline fuel is supplied into the intake passage 1 while its flow rate is adjusted by the throttle 13a due to the negative pressure downstream of the choke valve 9 in the intake passage 1 and gravity, thereby promoting warm-up of the engine after starting. can be done efficiently.

In this way, since the gasoline fuel for promoting warm-up is supplied to the downstream side of the choke valve 9, there is an advantage that the amount of fuel supplied can be automatically controlled in accordance with the operation of the choke valve 9.

Note that if the engine engine stops for some reason after the engine has started, the control unit 19 will stop energizing the second on-off valve 170 lunoid coil, thereby stopping the supply of gasoline fuel into the intake passage 1. . In such a case, excessively rich fuel is not supplied, and restart performance is improved.

In addition, when the engine temperature is higher than a predetermined value, the first
Since the second on-off valves 16 and 17 remain closed, gasoline fuel is not supplied to the intake passage 1, but in this case there is no problem because the engine can be operated sufficiently with alcohol fuel alone.

As detailed above, according to the auxiliary fuel supply device for an alcohol engine of the present invention, the starting performance of an alcohol engine can be significantly improved with a simple configuration, and
There is an advantage that the warm-up promotion performance of an alcohol engine can also be greatly improved.

[Brief explanation of drawings]

The figure is an overall configuration diagram showing an auxiliary fuel supply system for an alcohol engine as an embodiment of the present invention. 1. Intake passage, 2. ψ throttle valve, 3. Capretor, 4. Venturi part, 5. - Nozzle 66 @ float chamber, 7. - Float, 8.. Alcohol fuel supply path, 9.. Choke valve. , 10... Chalk button, 11...
-Choke wire, 12.13...first and second gasoline fuel supply paths (first and second gasoline fuel supply systems), 12a, 13a...throttle, 14...filter, 1
5. Gasoline fuel tank, 16.17. First and second on-off valve, 18. Temperature detection switch as temperature sensor, □19. Control unit)
, 20...Engine sensor, 21...Key switch, 2
1aa・starter terminal, 21b+1− ignition terminal, 23−・alarm lamp% 24・・reed switch,
25...Air cleaner, 26...Battery, C1...Control circuit for low temperature starting, C2...Control circuit for promoting warm-up. Sub-Agent Patent Attorney Yoshihiko Iyasu

Claims (2)

[Claims] (1) In an engine that operates using alcohol fuel as the main fuel, a gasoline fuel supply system connected to the intake passage to supply gasoline fuel as auxiliary fuel to the intake passage, and an intervening device in the gasoline fuel supply system. It is equipped with a temperature sensor that detects the engine temperature and a cranking sensor that detects the engine cranking state, and the engine temperature is set to a predetermined value during engine cranking based on the signals from each of the above sensors. An auxiliary fuel supply device for an alcohol engine, characterized in that a low temperature starting control circuit is provided that can open the on-off valve when the temperature is below a certain value. (2) Works that operate using alcohol fuel as the main fuel
In order to supply gasoline fuel as auxiliary fuel to the intake passage in the 3rd engine, the first
and a second gasoline fuel supply system;
The fuel supply system includes first and second on-off valves respectively interposed in the fuel supply system, a temperature sensor for detecting the engine temperature, a cranking sensor for detecting the engine cranking state, and a cranking sensor for detecting the engine operating state. Based on the signals from each sensor, the engine temperature 3 is adjusted during engine cranking.
a low-temperature start control circuit capable of opening the first on-off valve when the temperature is below a predetermined value; An auxiliary fuel supply device for an alcohol engine, comprising a warm-up promotion control circuit capable of opening the second on-off valve.