JPS6123659Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a starting aid device that mixes fuel into intake air when starting a diesel engine.

BACKGROUND ART Conventionally, a device that uses intake air heating is widely known as a starting assist device for a diesel engine in cold weather. As this intake air heating device, a combustion type heater is known, which heats intake air by dropping fuel onto a red-hot heater using electric heat to combust the fuel.

The fuel used for this heater is derived from the fuel tank and is the same as the fuel for the engine. There are also devices that are designed to allow you to inhale a small amount of ether, etc.

This idea was inspired by such conventional combustion heaters, uses the same fuel as the engine fuel for the heater, improves the ignitability of the engine, and allows the engine to be heated at times other than when starting. It is an object of the present invention to provide a starting assist device capable of supplying vaporized fuel.

This device is arranged in the intake passage of a diesel engine, and its temperature is kept above the boiling point and below the ignition point of the fuel normally used by the diesel engine, and is maintained above the ignition point of the normal fuel. It is equipped with a combustion type heater that is controlled in two stages in a second temperature range, and a device that supplies the above fuel to the combustion type heater, and operates as a combustion type heater when the engine is started at a low temperature, and mist the fuel during normal operation. It is characterized in that it is supplied to the intake pipe of the engine.

Hereinafter, embodiments of this invention will be described based on the drawings.

The figure is a configuration diagram of an embodiment of the device of this invention.
In the figure, 1 is a fuel injection pump, 2 is a feed pump, and 3 is a filter. fuel tank 4
The fuel is passed through the filter 3 by the feed pump 2.
The fuel is passed through and supplied to the fuel injection pump 1. It is then forced into the nozzle 5 by the plunger of the injection pump 1.

A branch pipe 6 supplies part of the fuel supplied from the filter 3 to the fuel injection pump 1 to the pipe 7. 8 is a solenoid valve, which is provided in this pipe 7. Reference numeral 11 denotes a heater, which is provided in the intake pipe 9 and receives fuel from the pipe 7. It is preferable to use a shield type glow plug for this heater 11.

12 is a current controller. This current controller 12
One end is connected to a power source 15 via a preheating switch 13 at startup and an engine key switch 14 placed in parallel with this (always on while the engine is rotating), and the other end is connected to a power source 15. , are connected to the heater 11.

This current controller 12 controls the current supplied to the combustion heater 11 according to the on/off states of switches 13 and 14, and when the preheating switch 13 is on at the time of starting, the temperature of the fuel is higher than the ignition point. When the switch 14 is turned on and only the switch 14 is turned on, the fuel introduced from the fuel tank 4 to the heater 11 is thermally vaporized at a temperature above the boiling point and below the ignition point. There is.

That is, since the preheating switch 13 is closed when the diesel engine is started at a low temperature, the heater 11,
The fuel is preheated via the current controller 12, and then when the starter is activated and cracking is started, the solenoid valve 8 is opened and fuel is supplied to the heater 11. At this time, the heater 11 is at a temperature sufficient to ignite the fuel, so it operates as a combustion type heater. Next, during normal operation of the engine, the temperature of the heater 11 is kept low by the current controller 12, so that the fuel vaporized by the heater 11 does not reach combustion, but is drawn into the intake pipe 9 in the form of a stream. The intake air passes through the intake valve 16 and enters cylinder 1 of the engine.
Sent to 7.

Although a shield type glow plug is used as the heater 11 in this embodiment, the heater 11 is not limited to this, and a conventional heater may be used or used in combination.

As described above, when the starting aid device of this invention is used, the conventional combustion type heater can be used or used in combination, and the same fuel as the engine fuel is sent to the heater, and this fuel is thermally vaporized without being combusted. This gas and liquid particles in the cylinder mix well, making it possible to improve starting performance and ignition performance. In addition, the current controller can automatically control the fuel supplied to the heater to thermally vaporize within a certain temperature range, so the heater temperature is always above the boiling point of the fuel and the ignition point. It has excellent features that are controlled by

[Brief explanation of the drawing]

The figure is a configuration diagram of the device according to this invention. 1...Fuel injection pump, 2...Feed pump, 3...Filter, 4...Fuel tank, 5...
Nozzle, 6... Branch pipe, 7... Branch pipe, 8...
...Solenoid valve, 9...Intake pipe, 11...Heater, 1
2...Current controller, 13...Preheating switch, 14
... Engine key switch, 15 ... Power supply, 16
...Intake valve, 17...cylinder.

Claims (1)

[Claims for Utility Model Registration] A starting aid comprising: a heater disposed in the intake passage of a diesel engine; means for supplying current to the heater for heating the heater; and means for supplying fuel to the heater. In the device, the means for supplying the current is configured such that the temperature of the heater is within a first temperature range that is above the boiling point and below the ignition point of the normal fuel of the diesel engine, and a second temperature range that is above the ignition point of the normal fuel of the diesel engine. A starting aid device characterized in that it is configured to be controlled in two stages with a temperature range.