JPS5932676A - Glow plug temperature control device for cylinder injection type internal-combustion engine - Google Patents

Abstract

PURPOSE:To prevent overheating and burning damage of the glow plug under a specified operating condition and reduce the levels of combustion noise and exhaust emission by a method wherein the temperature of the glow plug is controlled at a lower temperature than the conducting temperature for heating the glow plug during the specified operating condition of the engine. CONSTITUTION:When the count time of a timer 13 is elapsed and an after-glow is stopped after starting an auxiliary starting device A, a conduction detector 42 detects it and impresses a signal voltage to the control device 41. The device 41 operates by the signals of a water temperature sensor 31, a load sensor 32 and a revolution sensor 33 and when the specified operating condition, in which the speed of the engine is within a range from the lower speed than an idling operation to a high-speed operation under a middle load and the temperature of cooling water is lower than the overheat temperature thereof, is detected, it outputs to a coil 43a to conduct it. An electric power is supplied from an electric source 1 to the glow plug 7 through ignition relays 3, 43 and resistors 49, 6, however, the resistors 49, 6 are connected in series, therefore, an electric current is smaller than the same upon starting. According to this method, the plug 7 is protected from the burning damage due to combustion flame and noise as well as NOx may be reduced.

Description

[Detailed description of the invention]

Book:;;': Akira is equipped with a starting auxiliary device that heats the glow plug indoors with electricity!'1i if↓111J In a cylinder injection type internal #'S engine such as a diesel engine, even after the starting auxiliary device stops operating d-, the engine continues to operate at a constant level of l[) with iR1 + auxiliary device [i4. The present invention relates to a glow plug temperature control device d that operates the glow plug in an optimal state to reduce crab/burning noise or the amount of unburned components and carbon discharged from the bleed air. Direct-injection internal combustion engines, such as diesel engines, have different operating characteristics from gasoline engines; they use the pressure and temperature of intake air caused by piston compression to ignite the injected fuel. 1. There is a period from the start of direct irradiation to ignition, that is, an ignition delay period, which is long. As a result, the injected fuel that accumulates by the time of ignition burns out all at once, increasing the pressure inside the cylinder and increasing the medium and high frequency noise level associated with combustion. At the same time, the content of unnatural components nc (bow, carbon, etc.) in the υ1 air increases.And this tendency is particularly noticeable at low to medium speeds and low to medium loads, including idle links.
It appears often. Therefore, in general, a glow plug is installed in the combustion chamber and the glow plug is operated in the engine starting range to improve cold startability (7).
As shown in the Datsutrin maintenance guidebook 1 published by Ichisan Jidosha Co., Ltd.
■The glow plug is deactivated after the S period has elapsed. Such a conventional example is shown in FIG. 3 as part of the embodiment of the present invention, and will be described in detail later, so its explanation will be omitted, but as shown in FIG. 1, the preheating timer b operates, closes the relay switch C, and heats the glow plug d installed inside the combustion chamber while turning on the ignition switch a.
When the start contact a2 is turned on, the relay switch f is turned on for the opening time of the afterglow timer e from the secondary hofu, and the glow plug d is energized and heated. However, even after start-up, the ignition delay at low-medium speeds and low-medium loads of the engine, including idle links, is significant regardless of whether the warm-up is completed or not. Therefore, the combustion noise tends to be still loud. Therefore, the present applicant first proposed Utility Model Application No. 56-55723 and (7)
[7] Provided is a glow plug temperature control device configured to heat the glow plug with electricity in a low speed and low load region of the engine. However, the heating of the glow plug in this specific operating state is already after the start has been completed, so the glow plug is heated by the flame in the combustion chamber. There is a risk of inviting In view of the above-mentioned disadvantages of the conventional device, the present invention has been made to eliminate the corner T1.
A temperature control means is provided to energize and heat the glow plug at a lower temperature than the energizing heating temperature of the glow plug of the starting aid, thereby preventing overheating and melting of the glow plug, and reducing the combustion noise and exhaust emission levels under 11 test operating conditions. The present invention provides a glow plug temperature control device 4 configured to efficiently reduce the temperature. Embodiments of the present invention will be described below with reference to the drawings. In FIG. 3, 1 is a power supply, and 2 is a key switch, which has an on terminal 2a and a start terminal 2b, and is configured to be connected to an on terminal 21L at the same time when the start terminal 2b is turned on. 3 is an ignition relay, and when the key switch is turned on to the ON terminal 2a or the start terminal 2b, power is supplied from the power source 1 to the coil 3a, and the contact 3b is closed. 4 and 5 are normally open type relays, and when current flows through the respective coils 4a and 5a,
Current is supplied to the glow plug 7 by closing the contacts 4b, 5b. The glow plug T is provided in each combustion chamber, and the figure shows a case in which it is provided in a four-cylinder engine. The current value supplied to the glow plug 7 is reduced by a small amount r by a resistor up to 6t. Reference numeral 10 denotes a glow plug timer for controlling the energization time of the relays 4 and 5, that is, the energization time of the glow plug T. The glow plug timer 10 includes a lamp timer 11,
Preheat timer 12, afterglow timer 13 (il-
Be prepared. Reference numeral 14 denotes a normally open preheating timer relay, which has a contact 14b that closes when current is supplied from the preheating timer 12 to the coil 148. An afterglow relay 15 has a contact 15b that closes when a current is supplied from the afterglow timer 13 to the coil 15&. 21 is a regulator switch of the alternator, 22 is a normally open type check relay, one end of the coil 22a is connected to the regulator switch 21 of the alternator, and the other end is connected to the contact 3b of the ignition relay. The regulator switch 21b is closed when the engine is stopped or cranked because the meltanator does not generate electricity, and is opened when the engine is started. Therefore, the coil 22a of the check relay 22 is energized when the key switch 2 is turned on, the first switch 2a or the start terminal 2b is turned on, and the engine is stopped or cranking, and the contact 22b is turned on. Close. 23 is a glow pilot lamp which is turned on when the lamp timer 11 is turned on. Numeral 31 is a water temperature sensor which together with the load sensor 32 and rotation sensor 33 constitutes an engine operating state detection device.It is installed in the engine cooling water passage such as inside the water jacket of the engine, and detects the electrical resistance value depending on the cooling water temperature. is configured so that it changes. Each of these components is the ignition relay's tLa
3b, coil 14a of preheating timer relay; The contacts 22b of the preheating timer 12 and the electric relay are connected in series to the power supply 1, and the contacts 3b of the ignition relay, the contacts 14b of the preheating timer relay, and the coil 5a of the relay 5 are also connected in series. The contact 31) of the ignition relay l/-, the coil 4a of the relay 4 and the contact 15b of the afterglow relay 15
is connected in series with the power supply, and the ignition relay 3
contact point 3)], the glow pilot rung 23, and the lamp timer 11 are connected in series. The glow plug terminal voltage is input to the preheat timer 12 and the afterglow timer 13, and the glow plug terminal voltage is input to the preheat timer 12 and afterglow timer 13, and
Glow plugs! 1h voltage is inputted through the afterglow timer 13f. Further, when the key switch 2 is turned on to the start terminal 2b, the ¥¥L source 1 is also energized via the afterglow timer 13 to the coil 15a of the afterglow relay 15. The operation of the starting assist device A having such a configuration will be explained in detail. During a starting operation, when the key switch 2 is turned on to the ON terminal 2a as shown in Fig. 2, the regulator switch 21 is turned on because the engine is rotating one more time, so the coil 3a of the ignition relay 3 is energized. When the contact 3b is energized and closed, the voltage of the power supply 1 is increased to the electric relay 2.
The second coil 22a is energized. Therefore, the contact point 22b closes and the preheating timer 12 starts a blank period. Then, the coil 14a of the preheating timer l/-14 is energized and excited, the contact 14b is closed, the relay 5 is turned on, and the glow plug I is energized and heated. At the same time, the terminal voltage of the glow plug 7 is input to the preheating timer 12 and the afterglow timer 13 via the relay 40, which will be described later, and the preheating timer 12 preheats according to the terminal voltage BE of the glow plug I. timer relay 14
Determine the energization time for the carp/I/i 4a (glow plug terminal 'tlf, shorten the energization time for the culm with high pressure)
. On the other hand, if the afterglow timer 13 is connected to the input terminal, then the terminal voltage of the globe jig 7 and the water temperature sensor 31?
AI detects the flowing current and calculates the cooling water temperature/f7? =
L, the coil 15a of the afterglow relay 15 is energized for a time corresponding to the cooling water temperature (the lower the cooling water temperature, the longer the time). Therefore, the contact 15b is closed, the relay 4 is turned on, and the voltage from the -2 power supply 1 is now applied to the afterglow circuit via the relay 4, the resistor 6, and the circuit having the relay 5. Since power is supplied to the plug 7, the largest '11L flow flows and is rapidly preheated, turning the exothermic group into a dog. At this time, the terminal 1 pressure of the claw plug I is also input to the lamp timer 11, and the lamp timer 11 controls the energization time of the glow pilot lamp 23 provided at the driver's seat. After the key switch 2 is turned on to the ON terminal 2a, the glow pilot lamp 23 is extinguished after a certain period of time nfl set by the lamp timer 11, and after the h1 time of the preheating timer 12 has elapsed, the preheating timer relay 14 is turned off, the glow plug 7 receives power from the power supply 1 only through an afterglow circuit having a relay 4 and a resistor 6. Therefore, in order to reduce the power consumption of the glow plug 7 during cranking, preparations for the cranking operation are completed. The driver starts cranking operation at the same time as the glow pilot lamp 23 goes out. During cranking, a lower current is supplied to the glow plug T than during preheating. Therefore, the temperature at which the glow plug T generates heat is at a temperature suitable for rotating the starter motor. Retained. If the coolant temperature is high, the water temperature sensor 31 turns off, cutting off the input to the afterglow timer 13 during cranking, and the timer 13 may turn off. Therefore, the key is not pressed during cranking. A separate circuit is configured to input data directly from the start terminal of the switch 2 to the afterglow timer 13, and is configured to prevent the afterglow relay 15 from turning off during cranking. In other words, regardless of the cooling water temperature, during cranking the power is turned on via relay 4 and resistor 6.
- Plug T to the deer 1b) Supply power to the candy 11i
Make 1r easier. . When starting is completed, the key switch is turned on again by turning ON terminal 2aIc on. L2 or C'1 on the stand where the cooling water temperature is low.
, the water temperature sensor 31 is turned on and the afterglow occurs only for the timer 13's time period.
-15 turned on ■), glow plug 7 lJ, 1
■, Source 1 to relay 4, resistor 6f:: #I, preheat H■
,p''-no also receives a small tlj force supply.
1. The stability of re-firing is l'I < l et al. Because of the structure, after the operation of the starting aid device stops, the idle link is performed in the area of low, medium, low, and low load, etc., and when it starts, the engine starts to operate (with a large delay and combustion noise). 1
O-f,- which causes deterioration of paddy air pollution along with large scale)
As already mentioned, it was. In particular, the tendency shown in (1) is particularly noticeable in the operating conditions from the start to the end (the completion of off-loading) (1,
There was a platform that could not be sufficiently avoided even after warm-up was completed. Therefore, in the present invention, the pB motion auxiliary device soil i1 h1! [! +
Even after the completion of /, -'f- heat 51 and the ill-defined glow plug after the start υ;・The temperature at which the glow plug is energized and heated is also low. For example, the engine cooling water temperature of the water temperature sensor 31 is detected by the electromagnetic pickup type rotation speed detection 4. Hakuzuki, and furthermore, for example, the accelerator pedal 35 and the rotation by l-J'
A, fuel t[ri 1] (negative a of the negative
! h1in −”:”i 2, negative i' of the engine with force I7
! ? (Suzen charge injection fii: ) yi' It is detected that the medium 5 is below the load. -Yx-1, the operating state of the engine is within the heavy operating range described later, and it is connected in parallel in the middle of the afterclaw circuit between contact 151) of Gatsu Anku Glow Relay 15 and contact 3b of Ignition Relay. niNJ＞Lira7t, f(:lyamai(l, i6・chiin1
When I2 detects that the output voltage is set to 43, the output voltage is set to 43. 2. It is supplied to the coil 43a of the relay 40, and is not applied to the coil 40a of the normally closed relay 2. Contact 4 of the relay 40.
Q b is 'T1 (for R1, contact 4b of relay 4
, connected in series with the resistor 6 and the afterglow timer 13 i
When the relay 40 goes high, the afterglow timer 13 is activated. Stop. 49 is a 41L resistor, which is connected to the power supply by connecting the ignition relay 3, relay 43, resistor 6, and glow plug 1 in series, and connects it to the 4 glow plug energizing circuits. 1i11. After the engine starts in the auxiliary device 8, the glow plug 7 is energized through the relay 4 and the resistor 6, and the circuit resistance is made larger than the so-called afterglow circuit that uses M, IJ I, and the glow plug 7 is supplied with electricity. it7.31j to the 77 tarp o-tr,
7 ty) By making the second supply 'Fp, jji, and the like smaller, the electrical heating of the glow plug 7 is reduced. Starting aid device? , After the starting operation of A, aftergj:
After the n1 time of I-tie, 13 has elapsed, the relay 4 and resistor 6 are turned off, and the power type FL is supplied to the glow plug 7. 3Ic11J: The detector 42 detects the 2nd circuit ``1-Circuit energization is stopped'' and applies positive pressure to the control device 41.
ILL water temperature sensor 31, load sensor 32, rotor sensor 3
3-A, -i causes the engine to rotate when the load is less than 4i.

[・11 degrees is idling driving υ
is within the range of slightly low rotational speed to rapid rotational speed, and the temperature of the post-cooling water is below the critical temperature at which overheating occurs (for example, #-, j' approximately 108°C).
When the month-I+・1 volatile state reaches 4Φ17, relay 4
Output to coil 43 of No. 3 and pass through! If Yc is done. This 11 is shown in the shaded area 1 & of the 5th item 1, its method cW)
Power supply 1 maybe ignition relay 3, relay 43,
Resistor 49, Resistor 6) (i'l' to glow plug 7 through
The most important factor is the supply of power. ζ 4 Resistance 49 (J 徂 I')'t: 6 and the row of rows and drifts are present, so it depends on the auxiliary device"'C' 1
JTh electric, 11 seawater lifting platform (i.e. 'J than preheating)
[I;Afuku glow circuit 1 with small heating temperature 1 degree]
(at 1L) A very small current is applied to the plugs I' and 1-plug T, so the temperature of the current is 1 low! ￥
;, in the stopped state, υ is also high and the afterglow circuit is traced? 1
The temperature will be controlled to be lower than the ℃ state. That is, after starting (・J, since the glow plug γ is heated by the combustion flame, a current is passed through the glow plug at the time of starting operation), then the glow plug 7 is likely to melt due to overheating. The heating characteristics of the glove jig are shown in Figure 6 M. L is the conventional starting point!
Afterglow = - shows when the circuit is energized by the l111 auxiliary device. The map control device 41 turns off the relay 40.
To VC yacht, , Croix' Rough 7 Ka? M.I.A.
t Ift'l #"■・When heating is performed on stage B, the afterglow timer 13 is activated again to prevent damage, and the glow plug 7 due to the activation of the afterglow timer is prevented. Overheating is prevented in advance. In this way, in this example, t'1, afterglow; i
By simply connecting a resistor 49 in the inner row of the resistor 6 of the ff'nc circuit, you can create a starting aid in the engine starting region.Temperature control means for heating the glow plug by energizing it at a temperature lower than the energizing temperature for the low plug. Figure 4 shows another practical example of the present invention. In this example, the resistor 49 in the previous embodiment is replaced with a resistor 51 with a very small resistance value. Then, the voltage generated across the resistor 510 is input to the control device 41, and by utilizing the fact that the resistor I (11) changes depending on the temperature of the glow plug T, the change in the resistance value is caused by the change in the current value. By calculating the terminal voltage of the resistor 51, the temperature of the glow plug 7 is detected, and the energization time to the relay 43 is controlled. 2 is configured to control the energization time to 7. When the engine load is low, the soil combustion flame temperature is low, and therefore the temperature of the glow plug I is also low, so the energization time of the glow plug I is lengthened. As the load increases, the energization time is shortened and feedback control is performed to keep the glow plug temperature constant within the glow plug temperature control range.The ltk characteristics are shown in FIG. 6N. That is, this embodiment 1. Will the glow plug temperature IJ+' not lead to overheating melting?!, the structure provides a feedback system (iTl) to the crystallinity, and the temperature control means B is provided. ”, which has the advantage of being even more accurate)
Ru. As mentioned above, according to misfire +311, the auxiliary equipment falls into the engine starting area. “To state detection device 1” detects 7 pu/P! When the engine is in a constant engine operating state (J'), the glow plug is heated to a low temperature even when the heating temperature rises, so that the glow plug is heated to a low temperature even when the heating temperature rises. Glow plug one (1゛δ heat melting t, ft bristles - prevent 7
At the same time, heat the inside of the combustion chamber to an appropriate temperature and shorten the distribution +) < slow) by 1-1.
You can reduce the Ki Go mission level.

[Brief explanation of drawings]

1ζ], iY next starting aid fj /j'', 1
Circuit diagram, second tonneau "ltJ", time chart showing the working condition of the two, FIG. Other embodiments of the circuit (Tj, Figure 5 is 1?='x Mli
In the example! li! The degree control means of glow plug through rI
ilfij) Graph showing the range, Figure 6 is the book 'Il' 2 gate's fruit;
3. fg71′, : is a graph showing r properties. Person: Starting aid device B: Temperature m control means
2... Key switch 3... Eve switch 1 -4, 5... Relay 6... Resistor 1...
・Glow plug 10...Glow plug timer
12... Preheating cooler f''7 13... Afterglow timer 21... Regulator switch 22.
...Check -31...Water temperature sender 32.
・・Load sensor 33・Rotation - Hinge 40・
...Relay 41...Kai Kanosou fig, 4
2...Electricity detection 't:g 43...Relay 4
9.Resistance 51...Resistance 11￥ 1ffL1-i Deputy 1 person Day))'Pself1
Suke-shin (Zhu Shikai Ne Judai) λ (1 person attorney ± 1'l?
Shimadomi-) 11 To Figure 4 Figure 5 Figure 6 Load

Claims (1)

[Claims] Burning,! The energizing circuit that energizes and heats the glow plug installed in the J room in the engine starting area is detected by the starting auxiliary device, the engine operating state detecting device, and the engine operating state detecting device C. In the operating state, the above-mentioned beginning 11
The glow plug is passed through the glow plug at a temperature lower than the globe jig energization heating temperature in the engine starting area of the i1J auxiliary device.
7. A glow plug temperature control device for a direct injection internal combustion engine, characterized in that it is provided with a temperature control means for controlling the temperature.