JPS6282272A - Auxiliary device for starting engine - Google Patents

Abstract

PURPOSE:To shorten the cranking time sharply by allowing both No.1 and No.2 connecting means to be applied so as to heat up both glow plugs and air for combustion when an engine is preheated. CONSTITUTION:When a key switch 2 is turned on, a control device 8 allows a starter indicating lamp 84 to be turned on, and simultaneously allows No.1 and No.2 relays 6b and 7b to be excited for closing their contacts 6a and 7a so as to apply electric current both of glow plugs 3 and an air heater 5. Then after a specified period of time has elapsed to heat the glow plugs 3 up to 1,000 deg.C, the start indicating lamp 84 is turned off by its timer signal informing a driver of the start of cranking. Then, when the key switch 2 is connected to a ST terminal, an engine starting is initiated for allowing fuel to burn satisfactorily because intake air is heated and fuel is vaporized due to the increase in temperature. When the engine starts running, an electric charge detecting terminal 81 is turned on allowing a charge lamp 85 to be turned on for giving information to the driver. Thus, this configuration can shorten the cranking time sharply.

Description

Detailed Description of the Invention 3. Revision of the Invention: MII Description [Field of Industrial Application] The present invention relates to a starting assist device for smoothly starting an engine.

[Prior Art] Conventionally, in the case of a diesel engine, for example, the engine starting auxiliary device of this scale makes a glow plug red-hot at the time of starting the engine, and injects fuel from a combustion nozzle into the heated part of the glow plug through a nozzle 4 to cause half-combustion. A glow timer was used to shorten the energization time of the starter motor (which is heard during cranking when starting the engine). In addition, after the engine has started, the glow plug is heated for a certain period of time until the engine is warmed up and rotates smoothly, suppressing incomplete combustion and reducing exhaust smoke.

[Problems to be solved by the invention] Since a large current is required to energize the starter motor, if cranking (energization of the starter motor) is carried out for a long time, the amount of discharge from the battery, which is the power source for the vehicle, will increase. This will shorten the battery life. Especially in cold regions,
Since the cranking time when starting the engine tends to be long, there is a desire to further shorten the cranking time, but with the structure of the glow timer shown above, it is difficult to shorten the current cranking time. . Also,
In cold regions, exhaust smoke continues to be emitted even if afterglow occurs immediately after the engine starts, so there is a desire to reduce exhaust smoke.

The present invention has been made in view of the above circumstances, and its purpose is to provide an engine starting assist device that can shorten the cranking time when starting the engine and suppress incomplete combustion immediately after starting the engine. be.

Means for resolving problem E] In order to achieve the above object, the engine starting assist device of the present invention provides a vehicle power source, a glow plug attached to the engine, and air supplied to the combustion chamber of the engine. an electric air heater for heating the glow plug, a first connecting means for energizing the glow plug, a second connecting means for energizing the air heater, and switching control of the first connecting means and the second connecting means. It consists of a control device and a control device.

[Operation and Effects of the Invention 1] By turning on the first connecting means, the glow plug is rapidly back-heated. When cranking is performed with the first connection means turned on, fuel is injected into the heating part of the glow plug q4
and assists in fuel combustion.

By turning on the second connecting means, the air heater is rapidly heated to heat the intake air for combustion. When the crankshaft of the engine rotates with the second connection means closed, air heated by the air heater flows into the combustion chamber of the engine, improving fuel combustion efficiency.

When preheating the engine, by turning on the first connecting means and the second connecting means, the time for preheating the engine can be shortened due to the synergistic effect of heating the glow plug and heating the combustion air5. When the first connecting means and the second connecting means are turned on during cranking, the cranking time can be significantly shortened due to the synergistic effect of the combustion assistance by the glow plug and the combustion assistance by the air heater.

By turning on only one of the first connecting means or the second connecting means during cranking or at a predetermined time after starting the engine, combustion is assisted until the engine is warmed up, and the rotation speed immediately after the engine starts. At the same time as Nissin,
Smoke emissions can be reduced.

[Embodiment] Next, an engine starting assist device of the present invention will be explained based on an embodiment shown in the drawings.

FIG. 1 is an electric circuit diagram showing an embodiment of the engine starting assist device of the present invention.

Reference numeral 1 indicates a battery that is a power source for the vehicle. 2 has a de-energized leaf contact, an ON contact that is a switch for energizing the vehicle, and an ST contact that energizes a cell mora (not shown) while continuing to energize the ON contact, and is located at a position that is easy for vehicle occupants to operate. Shows a key switch.

3 shows a glow plug for rapid temperature rise, which is attached to the cylinder head 41 of the diesel engine 4 and whose heat generating part 31 heats the fuel ejected from the fuel injection nozzle 43 within the combustion chamber 42, as shown in FIG. 2. . As shown in FIG. 2, reference numeral 5 designates an electric air heater that is installed between the gathering part of the air intake manifold 44 that supplies combustion air to the combustion chamber 42 and the air filter 45, and heats the combustion air. Show 1. As shown in FIGS. 3 and 4, the air heater 5 is made of a nichrome material that generates heat when energized, and includes a band-shaped heating element 51 bent multiple times into a bellows shape, and The insulating part 52 is made of an insulating material such as alumina and supports both ends of the bent part of the insulating part 51, and the insulating part 52 is held so that the heating element 51 is disposed in the air circulation hole 53 provided inside. An aluminum housing 54 made of an aluminum alloy and installed between the manifold 44 and the air filter 45, a leaf spring 55 that holds the insulating part 52 so that the insulating part 52 does not move within the aluminum housing 54, and the aluminum housing 54. It is provided with an insulating base 56 between it and the aluminum housing 54 so as not to be energized, and is composed of two connection terminals 57 that energize the outside of the aluminum housing 54 and the end of the heating element 51. 6 is a first regular contact point 6a that connects the glow plug 3 to the battery 1 in order to rapidly raise the temperature of the glow plug 3 to a high temperature;
The first switch, which is the first connection means of the present invention, is shown comprising the first relay coil 6b. 7 is for the purpose of rapidly raising the temperature of the heating element 51 of the air heater 5 to a high temperature and heating the air passing through the air intake manifold 44.
A second regular contact point 7 that energizes the air heater 5 with the battery 1
a shows the second switch, which is the second connection means of the present invention, and includes the second relay coil 7b. 8 indicates a control device;
The ON contact of the key switch 2, the ST contact, the charging detection terminal 81 of the regulator that is turned ON when the battery 1 is charged (IN), and the water temperature sensor 1 that is turned ON when the engine coolant water temperature is higher than a predetermined temperature (for example, 50°C). no switch 82,
The vehicle speed sensor switch 83, which is turned on when the vehicle is stopped, is input, and the first relay coil 6b and the second relay coil 7 are turned on.
b.

It is provided to control the energization of a start indicator lamp 84 mounted at a position visible to vehicle occupants.

Next, the operation of the control device 8 will be explained with reference to the time chart shown in FIG.

By setting the key switch 2 to the ON contact at the time indicated by the dashed line in the figure, energization of the start indicator lamp 84, the first relay coil 6b, and the second relay coil is started. As a result, the glow plug 3 and air heater 5
heats up rapidly. By the operation of the timer circuit provided in the control device 8, the glow plug 3 is heated to a temperature of 900°C to 110°C.
When the predetermined time t1 until the engine is heated to 0° C. has elapsed, the start indicator lamp 84 goes out, and the driver turns the key switch 2 into the ST terminal to give an instruction to start cranking. When the key switch 2 is connected from the ON contact to the ST contact at the time shown by the dashed line B in the figure, the starter motor (not shown) is energized, the starter flywheel connected to the crankshaft of the engine 4 rotates, and the crankshaft starts. Fuel is injected into the combustion chamber 42 from the fuel injection nozzle 43 according to the rotation angle of the shaft. As the flywheel rotates, air heated by the air heater 5 flows into the combustion chamber 42, and the glow plug 3 half-combusts the injected fuel, improving fuel combustion efficiency.
For example, as shown in FIG. 6, only the glow plug 3 is energized (
Compared to starting assistance using the dashed line C in the figure, energizing the glove 3 and the air heater 5 (solid line D in the figure) requires less time from the start of cranking to the start of the engine. For example, when the engine 4 is started at the time indicated by the dashed line E in the figure, the battery 1 becomes charged, the charge detection terminal 81 is turned on, and the charge lamp 85 lights up, notifying the driver that the engine 4 has started. . When the driver sets the key switch 2 from the ST contact to the ON contact at the time indicated by the dashed line F in the figure, the first relay coil 6b is de-energized and the supply of current to the glow plug 3 is stopped. However, the second relay coil 7b continues to be on for a predetermined time t2 until the engine 4 is warmed up by the operation of a timer circuit provided in the control device 8. Since air heated by the air heater 5 is supplied to the combustion chamber 42 for a predetermined period of time 2 after the engine 4 starts, combustion efficiency immediately after the engine starts is improved, exhaust smoke is reduced, and the engine 4 runs smoothly. Rotate it. In addition, the solid line G in the figure shows the temperature of the glow plug 3, and the solid line H in the figure shows the temperature of the air heater 5. S [The temperature of the air heater 5 decreases after the contact is set because heat is taken away by the combustion air supplied to the combustion chamber 42. Further, the control device 8 controls the first relay coil 6b, the first relay coil 6b, and the second 2 relay coil 7
It is provided so that the energization of b is 0)F.

In the above embodiment, the glow plug and the air heater are energized during cranking of the engine, but only the glow plug or the air heater may be energized.

In the above embodiment, the air heater is energized immediately after the engine starts ωj, but it is also possible to provide the glow plug so that only the glow plug is energized, or to energize the air heater and to attach a current limiting resistor to the claw plug. It is also possible to communicate with the city through

In addition to the above embodiments, energization of glow plugs and air heaters,
Control of energization of only the glow plug and energization of only the air heater 5 may be provided so as to be switched depending on the environmental temperature of the vehicle.

In the above embodiment, the present invention is applied to a direct injection type diesel engine, but it may be applied to other engines such as a pre-combustion air type, a swirl chamber type diesel engine, and an alcohol engine.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of the control device, Fig. 2 is a partial sectional view of the diesel engine showing one state in which a glow plug and a heater are installed, Fig. 3 is a top view of the air heater, and Fig. 4
FIG. 5 is a side view of the air heater, FIG. 5 is a time chart showing the operation of the control device, and FIG. 6 is a graph showing changes in cranking time depending on the environmental temperature.

Claims (1)

[Scope of Claims] 1) A vehicle power supply, a glow plug attached to an engine, an electric air heater that heats air supplied to a combustion chamber of the engine, and a second air heater that energizes the glow plug. 1. An engine starting auxiliary device comprising a first connecting means, a second connecting means for energizing the air heater, and a control device for controlling switching between the first connecting means and the second connecting means. 2) The control device is configured to turn on the first connecting means and the second connecting means before starting the engine, and turn on only the second connecting means for a predetermined period of time after starting the engine. An engine starting assist device as claimed in claim 1.