JPH036866Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a starting assist device that smoothly starts an engine in extremely cold weather.

[Prior Art] Conventionally, for example, engine starting aids have been provided in the glow plug's energizing circuit with a resistor that suppresses energization to the glow plug when the temperature of the glow plug installed in the combustion chamber of a diesel engine exceeds a set temperature. The device is present.

[Problems to be solved by the invention] In the case of the above-mentioned conventional engine starting aid device, is the power consumed by the register discarded?
Or they were installed in the intake manifold and used to heat the intake air, and were ineffective or inefficient. Furthermore, registers generate heat and are dangerous.
It was necessary to make it larger so that it would not overheat.

Furthermore, in extremely cold temperatures of -30°C or below, starting becomes a problem, and normal lubricating oil loses its fluidity. To deal with such conditions, consideration must be given to installing a heater in the oil pan, cooling water passage, etc., and supplying electricity from an external power source to keep the vehicle warm while the vehicle is not in operation. Figure 6 shows the relationship between starting time and test temperature. Figure 6 shows that in extremely cold weather, below -30℃, the engine cannot be started unless a heater is installed.

The purpose of this invention is to provide an engine starting aid that eliminates the reactive power consumed by the resistor, makes the resistor smaller and lighter, and enables the engine to be started in optimal conditions even in extremely cold weather without using an external power source. do.

[Means for Solving the Problems] The engine starting assist device of the present invention includes a vehicle power source, a glow plug installed in the combustion chamber of the engine, and a glow plug installed in the oil pan or cooling water passage of the engine. a resistor that suppresses the supply of current to the glow plug if the temperature of the glow plug exceeds a set temperature when the glow plug is energized; and a first resistor that connects the glow plug and the resistor to the power source. and a switching means having a second setting position in which only the register is connected to the power supply.

[Operation] The engine starting assist device of the present invention has the following effects when the switching means is in the first setting position and the second setting position:
Since the resistor is installed inside the engine's oil pan or in the cooling water passage, the heat generated when the resistor is energized is removed, and it can be made smaller.Furthermore, the power consumption and heat generated by the resistor can be reduced by using a lubricating oil heating heater or cooling water heating. Can be used as a heater.

In addition, when the switching means is in the second setting position, only the resistor is connected to the power supply, so the resistor can be energized even when the glow plug is not energized.
There is no need to separately install a heater inside the oil pan or cooling water passage, or to supply power from an external power source while the vehicle is not in use. It becomes possible to maintain heat in the oil pan and cooling water passage.

[Example] The present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is an electrical circuit diagram showing an embodiment of the present invention.

1 indicates a battery which is a power source for the vehicle. Reference numeral 2 denotes a key switch that is provided in the vehicle interior and has an OFF contact that is not energized, an ON contact that is a switch for energizing the vehicle, and an ST contact that energizes a starter motor (not shown) while continuing to energize the ON contact. 3 indicates a glow plug that heats fuel within the combustion chamber of the diesel engine 4. 5 is as shown in Figure 2,
Attached to the oil pan 41, it heats the lubricating oil in the oil pan 41 and supplies current to the glow plug 3 when the temperature rises above the set temperature (1100°C) or when performing afterglow. Indicates the register to suppress.

As shown in FIGS. 3 and 4 (identical parts are given the same numbers), the register 5 is housed in an outer tube 51 made of aluminum or its alloy, stainless steel, or the like. Reference numeral 52 indicates a powdered insulator filled in the inner space of the tube 51. Reference numeral 53 denotes a mounting bracket having a bolt shape as a whole with a through hole for passing wires in the axial direction, and a threaded portion for screwing into the mounting screw hole 54.

Reference numeral 6 indicates a glow plug energizing switch which is a normally open contact provided in the glow plug energizing circuit in order to rapidly raise the temperature of the glow plug 3 to a high temperature, and 61 indicates a relay coil of the glow plug energizing switch 6. show.

Reference numeral 7 indicates a switching means having a first setting position in which the glow plug 3 and the resistor 5 are connected in series and connecting the glow plug 3 and the resistor 5 to the battery 1, and a second setting position in which only the resistor 5 is connected to the battery 1. . The first setting position of the switching means 7 is
This is achieved by turning on the changeover switches 71 and 72, which are normally open contacts. The second set position of the switching means 7 is the position of the switching switches 73 and 74, which are normally closed contacts.
Achieved by ON state. 75, 76, 77,
78 are changeover switches 71, 72, 73,
74 relay coil is shown.

When the switching means 7 is in the second setting position, only the resistor 5 is connected to the battery 1, so that the resistor 5 can be energized even when the glow plug 3 is not energized, so even when the vehicle is at rest, the battery 1 can be energized. By energizing the resistor 5, it is possible to keep the lubricating oil in the oil pan 41 warm. Reference numeral 8 indicates an electric control circuit provided with a timer circuit for storing and setting a predetermined time and an afterglow timer circuit.

Reference numeral 9 indicates a glow lamp that is installed inside the vehicle interior and indicates the end of the residual heat of the glow plug, and 10 indicates a charge lamp that is installed inside the vehicle interior. 11
12 indicates a vehicle speed sensor switch that is turned on when the vehicle is stopped; 12 indicates a water temperature sensor that is turned on when the engine cooling water temperature is higher than a set value (for example, 80°C);
13 indicates that the engine lubricating oil temperature is at the set value (e.g.
Indicates an oil temperature sensor that turns ON at temperatures above 50°C.

In this embodiment, the diesel engine 4 is a water-cooled engine, and the cooling water cooled through the radiator 42 is sent into the cooling water passage 44 of the engine 4 by a cooling water pump 43 activated by the engine 4. , cools the inside of the engine 4, that is, the cylinder outer circumference 45, cylinder head 46, etc., and returns to the radiator 42 via the water temperature sensor 12. In the radiator 42, the air is cooled down to an appropriate temperature by a cooling fan 47 driven by the engine 4, and then circulated within the engine 4 again.

Furthermore, lubricating oil for the diesel engine 4 is stored in the lower part of the engine 4, and is sucked up by an oil pump (not shown) through an oil strainer 48 from an oil pan 41 in which a resistor 5 and an oil temperature sensor 13 are installed. The lubricating oil is cooled by the lubricating oil cooling device, lubricates the interior of the engine 4, that is, the main bearing, camshaft, crank pin bearing, valve mechanism, piston, and other rotating and sliding members, and returns to the oil pan 41 again.

The operation of the electric control circuit 8 will be explained based on the time chart shown in FIG.

At the time indicated by the dashed-dotted line in the diagram (vehicle is at rest), the key switch 2 is connected to the OFF contact, and at this time, the vehicle speed sensor switch 11, the water temperature sensor 12
In response to the input from the oil temperature sensor 13, the electric control circuit 8 controls the relay coils 61, 75, 76, 77,
78 is de-energized. Also, from the oil temperature sensor 13
When there is an OFF signal, that is, when the temperature of the lubricating oil is below the set temperature, the relay coils 77 and 78 are energized. When the relay coils 77 and 78 are energized, the changeover switches 73 and 74 are connected, and the resistor 5 is energized, and the heat generated when the resistor 5 is energized keeps the lubricating oil in the oil pan 41 warm. Set the temperature to the appropriate temperature. Therefore, the engine 4 can be started in the optimum condition using only the electric power from the battery 1, without using an external power source, even in extremely cold weather, for example, below -30°C.

When the key switch 2 is set from the OFF contact to the ON contact (dotted chain line in the figure), energization of the glow lamp 9, charge lamp 10, and relay coil 61 is started. Therefore, the glow plug energizing switch 6 is connected and the glow plug 3 is rapidly heated. Relay coil 7
5, 76, 77, and 78 are all de-energized at this time, the changeover switches 71, 72, 73, and 74 are disconnected, and the register 5 is not energized. Although not adopted in this embodiment, when the oil temperature sensor 13 does not detect the set temperature at this point, the relay coils 77 and 78 are energized to supply current to the resistor 5 and heat the lubricating oil. It's okay. Further, an oil temperature lamp may be provided in the vehicle interior so that the driver can check the temperature of the lubricating oil of the engine 4, which lights up when the temperature is below a set temperature.

When the timer circuit of the electric control circuit 8 has passed the set time T1 for heating the glow plug 3 to 900°C to 1100°C, the glow lamp 9 is turned off and the key switch 2 is turned on. prompts the driver to switch from to ST contact to start engine 4 start.

When key switch 2 is connected from the ON contact to the ST contact (dotted chain line in the figure), the starter motor (not shown) is energized, the starter flywheel connected to the crankshaft of engine 4 rotates, and fuel is injected into the combustion chamber. be done. As the flywheel rotates, air flows into the combustion chamber and the glow plug 3
Because the fuel injected into the combustion chamber is partially combusted,
Fuel combustion efficiency improves.

When the engine 4 starts, the battery 1 becomes charged and the charge lamp 10 turns off, notifying the driver that the engine 4 has started.

When the driver returns the key switch 2 from the ST contact to the ON contact, the relay coil 61 is de-energized and the supply of current to the glow plug 3 is stopped.

When the set time T2 (set by the timer circuit of the electric control circuit 8) has elapsed after the driver returns the key switch 2 from the ST contact to the ON contact.
The relay coils 75 and 76 begin to be energized.
The relay coils 75 and 76 are energized for a set time T3 until the engine 4 is warmed up, which is set by the afterglow timer circuit of the electric control circuit 8. This relay coil 75,
76 is energized, a limited current is supplied to the glow plug 3 via the resistor 5, and the glow plug 3 whose temperature is suppressed to a lower temperature than when the key switch 2 is set to the ST contact produces an afterglow immediately after the engine 4 starts. conduct. At this time, the resistor 5 is energized and the lubricating oil is heated to the optimum temperature for lubrication, so even if you start the engine 4 in extremely cold weather below -30°C, it will take time for the lubricating oil to reach the end. This prevents dangers such as scuffing and seizure of pistons, bearings, valves, etc. Furthermore, since the electric power consumed by the resistor 5 can be used as a heater for heating the lubricating oil, there is no need to increase the size of the resistor 5, and the size and weight can be reduced to less than half of the conventional one.

In this embodiment, the resistor is installed in the oil pan, but it may also be installed in the engine cooling water passage like the register 55 shown by the broken line in FIG. It is possible to have the electric control circuit determine whether or not to energize the 55. Alternatively, the resistor may be manually de-energized while the vehicle is at rest, and then manually energized before the engine is started.

Further, although a diesel engine is used as the engine, the present invention may be applied to any engine as long as it is a direct injection type, a preheating combustion chamber type, a swirl chamber type diesel engine, or an engine in which a glow plug is attached to the combustion chamber.

[Effects of the Invention] The engine starting assist device of the present invention has a register that is less than half the size and weight of the conventional register, thereby achieving miniaturization of the register. Since the resistor is installed inside the oil pan or cooling water passage, the resistor can be used as a lubricating oil heater or a cooling water heater, and all of the power consumed by the resistor can be used effectively. Since the glow plug, which is a heating element, can be used alone as a heater even when the glow plug is not energized, the engine can be started in the optimum condition without using an external power source even in extremely cold weather, and this has the effect of improving startability.

[Brief explanation of the drawing]

Figure 1 is an electric circuit diagram of the electric control circuit adopted in the present invention, Figure 2 is a schematic diagram of a diesel engine showing the installation state of the resistor according to the present invention, Figure 3 is a side view of the register, and Figure 4. 5 is a side sectional view of another resistor, FIG. 5 is a time chart showing the operation of the electric control circuit adopted in the present invention, and FIG. 6 is a graph of starting time and test temperature. In the diagram, 1... battery (vehicle power supply), 2...
Key switch, 3... Glow plug, 4... Diesel engine, 5... Register, 6... Glow plug energizing switch, 7... Switching means, 8...
Electrical control circuit.

Claims (1)

[Claims for Utility Model Registration] 1. A vehicle power source, a glow plug installed in the combustion chamber of an engine, and a glow plug installed in the oil pan or cooling water passage of the engine, and when the glow plug is energized, the glow plug is installed in the combustion chamber of the engine. a resistor that suppresses the supply of current to the glow plug when the temperature of the plug exceeds a set temperature; a first setting position that connects the glow plug and the resistor to the power source; and a first setting position that connects only the resistor to the power source. and switching means having a second setting position. 2. The engine starting assist device according to claim 1, wherein the resistor is installed in an oil pan of the engine to keep lubricating oil warm. 3. The engine starting assist device according to claim 1, wherein the resistor is installed in a cooling water passage of the engine and keeps the cooling water warm. 4. The engine starting assist device according to claim 1, wherein the switching means is switched by an input from an engine oil temperature sensor installed in an oil pan of the engine. 5. The engine starting assist device according to claim 1, wherein the switching means is switched by an input from an engine water temperature sensor installed in a cooling water passage of the engine.