JP3539201B2 - Internal combustion engine having a combustion heater - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an internal combustion engine having a combustion-type heater, and more particularly, to an internal combustion engine having a combustion-type heater that introduces combustion gas into an intake system of the internal combustion engine to promote warm-up of the internal combustion engine.
[0002]
[Prior art]
It is necessary for the internal combustion engine to improve startability in cold weather and promote warm-up. For example, Japanese Patent Application Laid-Open No. 62-75069 discloses a technique using a vaporizing combustion heater attached to an intake passage of a multi-cylinder internal combustion engine. According to this technique, before starting the internal combustion engine, that is, before starting the rotation of the crankshaft by the reciprocating motion of the piston obtained during the explosion stroke during the operation stroke of the internal combustion engine, the combustion type heater is started prior to the start. The engine cooling water is heated by the heat of the combustion gas emitted at that time. On the other hand, after the internal combustion engine is started, it is provided in the intake passage and is closed before the internal combustion engine is started, but is opened after the internal combustion engine is started. , Thereby warming the cylinders. In the operation stroke of the internal combustion engine, the rotation of the crankshaft by the reciprocating motion of the piston obtained in the explosion stroke is hereinafter referred to as "the internal combustion engine rotates by itself" or "the engine starts" unless otherwise specified. This is distinguished from rotation of the internal combustion engine when the crankshaft is rotated by engine rotation means attached to the internal combustion engine body.
[0003]
[Problems to be solved by the invention]
By the way, in the case of a multi-cylinder internal combustion engine, even if combustion gas is supplied to each cylinder before the start of the internal combustion engine, the intake ports of all cylinders are not open at that time, When the overlap between the intake valve and the exhaust valve is small, the exhaust gas passage does not communicate with the inside of the cylinder, so that the combustion gas does not flow into the cylinder. Therefore, almost no combustion gas is introduced into the cylinder. Even if the combustion gas is introduced into the cylinder, there is a cylinder where the combustion gas is introduced and a cylinder where the combustion gas is not introduced. Is also limited to a specific cylinder. If there is a difference in warm-up for each cylinder, a difference will also occur in the combustion state and the degree of friction in the operating part.
[0004]
For this reason, if fuel for combustion is injected into each cylinder in a state where there is a difference in warm-up for each cylinder, the startability of the internal combustion engine, especially at low temperatures, is poor, or the internal combustion engine emits There is a problem of so-called emission in which exhaust gas purification is not sufficient.
[0005]
It is also conceivable to provide a catalytic converter as an exhaust gas purifying means in an exhaust system of an internal combustion engine. In order for the catalyst used in this catalytic converter to function effectively, it is necessary to make the temperature suitable for the catalyst to function effectively. Therefore, the sooner the member temperature in the exhaust passage increases, the sooner the catalyst functions, and the better the purification of the exhaust gas of the internal combustion engine.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has an improved startability in an internal combustion engine that promotes warm-up by introducing combustion gas from a combustion heater into an intake system of the internal combustion engine. It is an object of the present invention to provide an internal combustion engine having a combustion-type heater capable of improving exhaust gas purification.
[0007]
In order to solve the above-mentioned problems, an internal combustion engine having a combustion type heater according to the present invention introduces combustion gas into an intake system of the internal combustion engine, whereby the combustion gas is transferred to a cylinder of the internal combustion engine. An internal combustion engine having a combustion-type heater for promoting warm-up by guiding the inside of the internal combustion engine, and has the following configuration.
(1) The operation of the combustion type heater is performed when the engine rotation means attached to the internal combustion engine body is operated, and after the internal combustion engine is rotated a predetermined number of times by the engine rotation means, or the internal combustion engine is rotated by the engine rotation means. After a predetermined time has elapsed from the start of rotation after the rotation, the combustion chamber of the internal combustion engine is notFuel injection means for injecting the fuel for combustion in the fuel cell.
[0008]
Here, a multi-cylinder internal combustion engine is preferable as the internal combustion engine. The rotation of the internal combustion engine by the engine rotation means attached to the internal combustion engine main body means that the crankshaft rotates without depending on the reciprocating motion of the piston obtained during the explosion stroke during the operation stroke of the internal combustion engine, and thereby, in each cylinder, Means that the piston reciprocates. Therefore, with the reciprocating motion of the piston, the intake port and the exhaust port of each cylinder open and close alternately.
[0009]
In the internal combustion engine having the combustion type heater according to the present invention, the combustion type heater operates when the engine rotating means is operated, that is, before the internal combustion engine rotates by itself. At this time, the combustion gas emitted from the combustion type heater is stored in each cylinder before the internal combustion engine itself rotates, with the reciprocation of the piston in the cylinder due to the rotation of the crankshaft by the engine rotating means. It enters through an intake port and then flows out of each cylinder from its exhaust port toward the exhaust system of the internal combustion engine. The heat of the combustion gas increases the temperature of the inner wall of the cylinder and the temperature of the exhaust system members in the exhaust passage by the heat of the combustion gas of the combustion heater flowing into the exhaust system.
[0010]
As described above, the crankshaft is rotated by the engine rotating means attached to the internal combustion engine body, and the combustion gas of the combustion heater flows into each cylinder before the internal combustion engine itself rotates, thereby causing the internal combustion engine to rotate by itself. Before all the cylinders are already warmed up evenly. Therefore, before the internal combustion engine rotates by itself, the cylinder inner wall temperature becomes equally high in all cylinders, and the combustion is stabilized. Further, since the friction is reduced, the startability of the internal combustion engine can be improved even when the outside air temperature is low, such as in cold weather, so that the engine cooling water is cold.
[0011]
At the beginning of the timing of supplying fuel to the combustion chamber of the internal combustion engine, a predetermined time after the start of rotation after the internal combustion engine is rotated by a predetermined number of times by the engine rotation means or after the rotation of the internal combustion engine by the engine rotation means. After the lapse of time, the combustion of the internal combustion engine starts after all the cylinders have been sufficiently heated by the combustion gas of the combustion heater. As a result, purification of exhaust gas can be improved, that is, emission can be reduced.
(2) In the above item (1), it is preferable that the engine rotating means is a starter motor.
(3) In the above item (1) or (2), the exhaust system of the internal combustion engine may have a catalytic converter as exhaust gas purifying means.
[0012]
In the internal combustion engine having the combustion heater of the present invention, when the combustion gas of the combustion heater reaches the exhaust system as described above, the temperature of the components in the exhaust passage increases, and as a result, the catalyst temperature of the catalytic converter also increases. Therefore, the engine rotating means operates until the catalyst reaches a temperature sufficient to perform its function, and thereby the engine rotating means is operated so that all the cylinders are sufficiently warmed by the heat of the combustion gas of the combustion heater. By setting the rotation speed and the rotation continuation time of the internal combustion engine, the catalyst is already in a state where it can function sufficiently when the internal combustion engine rotates by itself. Therefore, purification of exhaust gas can be further improved.
(4) In any one of the above items (1) to (3), the predetermined rotation speed of the internal combustion engine by the engine rotation means or a predetermined lapse from the start of rotation of the internal combustion engine after the rotation of the internal combustion engine by the engine rotation means The time may be set to be short when the temperature of the engine-related element is high, and to be long when the temperature is low. Here, the engine-related element includes, for example, engine cooling water.
[0013]
By doing so, the combustion gas of the combustion type heater is sufficiently distributed to each cylinder for a longer period of time in cold weather, so that the warm-up of each cylinder before the internal combustion engine rotates by itself becomes longer. Can be enough. Therefore, it is not necessary to restart the engine rotation means, and the startability is improved. Further, when the temperature is not cold, the ratio of the combustion gas of the combustion heater to each cylinder is small, so that the engine rotating means may not be operated more than necessary. Therefore, there is no waste of energy.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Overall description of device>
The engine 1 as an internal combustion engine is of a water-cooled type, and has an engine main body 3, an intake device 5 for feeding air necessary for combustion into a plurality of cylinders (not shown) of the engine main body 3, and an air-fuel mixture burned in the cylinder. The vehicle has an exhaust device 7 for discharging the exhaust gas to the atmosphere and a heater 9 for heating the interior of the vehicle on which the engine 1 is mounted.
<Explanation of device components>
(Engine 3)
The engine body 3 includes a crankshaft therein, and rotates the crankshaft by reciprocating pistons in a cylinder (not shown). Further, before the internal combustion engine itself rotates, the crankshaft is rotated by a starter motor as an attached engine rotation means.
[0015]
Further, fuel for combustion is injected into a combustion chamber of the cylinder by an injector (not shown) as a fuel injection means. The first fuel injection from the injector into the combustion chamber is performed after a predetermined number of rotations of the crankshaft by the starter motor or after a predetermined time has elapsed from the start of the rotation of the crankshaft by the starter motor. In other words, fuel is not injected by the injector until the starter motor rotates the crankshaft a predetermined number of times or a predetermined time has elapsed. In this embodiment, the former, that is, the fuel injection is performed for the first time after the crankshaft is rotated a predetermined number of times by the starter motor.
[0016]
Further, a water jacket, which is a cooling water passage (not shown), through which cooling water circulates, is provided inside the engine body 3 and belongs to the intake device 5 via the water pipes W1, W2, and W3 with the water jacket as a starting point. The cooling water circulation passage 10 circulating between the combustion heater 17 and the vehicle interior heater 9 outside the engine body 3 is formed. The water jacket is provided with an engine water temperature sensor 40a for detecting the temperature of the engine cooling water flowing therethrough. In this embodiment, it is shown as being attached to a joint between the water pipe W1 and the water jacket.
(Suction device 5)
The intake device 5 has an air cleaner 13 that takes in fresh air into a cylinder as a start end of the intake device 5. Then, between the air cleaner 13 and an intake port (not shown) of the engine body 3 at the end of the intake device 5, the compressor 15a of the turbocharger 15, which is an intake system structure, the combustion heater 17, the intercooler 19, and the intake manifold 21.
[0017]
These intake system structures belong to an intake pipe 23 having a plurality of connecting pipes.
(Intake pipe 23)
The intake pipe 23 is roughly divided into a downstream connection pipe 27 which is forcibly pushed by the compressor 15a into the outside air entering the intake device 5 to be in a pressurized state, and an upstream connection pipe 25 which is not. Can be different.
(Upstream connecting pipe 25)
The upstream connection pipe 25 is composed of a rod-shaped main pipe 29 extending straight from the air cleaner 13 toward the compressor 15a, and a heater branch pipe 31 as a branch pipe connected to the main pipe 29 in a bypass shape.
(Branch 31 for heater)
The heater branch pipe 31 includes the combustion type heater 17 in the middle thereof. Further, the heater branch pipe 31 connects an upstream portion of the combustion type heater 17 in the air flow direction with the main flow pipe 29 and an air supply path 33 for supplying fresh air, that is, air from the main flow pipe 29 to the combustion type heater 17. And a combustion gas discharge passage 35 that connects a downstream portion of the combustion type heater 17 in the air flow direction with the main pipe 29 and discharges combustion (exhaust) gas from the combustion type heater 17 to the main pipe 29. The air related to the branch pipe 31 for the heater means not only the fresh air a1 entering the branch pipe 31 for the heater via the air cleaner 13, but also the combustion gas a2 emitted from the combustion type heater. . The combustion gas of the sintering heater is a gas which has almost no smoke, in other words, does not contain carbon. Therefore, it does not hinder use as intake air of the internal combustion engine.
Further, of the connection points c1 and c2 of the air supply path 33 and the combustion gas discharge path 35 with the main pipe 29, the connection point c1 is located on the upstream side of the main pipe 29 from the connection point c2. Therefore, the air a1 from the air cleaner 13 is first divided into the air a1 that branches off to the branch pipe 31 for the heater at the connection point c1 and the air a1 ′ that goes to the connection point c2 without branching. Further, at the connection point c2, the air a2 branched at the connection point c1 and subjected to the combustion of the combustion type heater 17 to become the combustion gas merges with the fresh air a1 ′ which did not branch at the connection point c1 to mix the combustion gas. It becomes air a3.
[0018]
The air a1 branched at the connection point c1 returns to the main pipe 29 as air a2 from the connection point c2 via the air supply path 33, the combustion heater 17 and the combustion gas discharge path 35. Since the air a2 returning to the main pipe 29 is a combustion gas which is subjected to the combustion of the combustion type heater 17 and has heat, this gas is returned to the main pipe 29 to be connected to the air a1 'which has not branched. When it joins at the point c2 and becomes the combustion gas mixed air a3, as a result, the combustion gas mixed air a3 becomes high-temperature intake air entering the engine body 3.
[0019]
In FIG. 1, the downstream connecting pipe 27 is a pipe connecting the compressor 15a and the intake manifold 21, and the one shown in FIG. 1 has an L shape. Further, an intercooler 19 is arranged at a position near the intake manifold 21.
(Exhaust device 7)
On the other hand, the exhaust device 7 has an exhaust port (not shown) of the engine body 3 as a start end of the exhaust device 7 and an exhaust manifold 37, the turbine 15 b of the turbocharger 15, and an exhaust port between the exhaust port 7 and the muffler 41 at the end of the exhaust device 7. A catalyst converter 39 having a catalyst is provided on the exhaust pipe 42. The air flowing through the exhaust device 7 is indicated by reference numeral a4 as the exhaust gas of the engine 1.
(Combustion heater 17)
The structure of the firing type heater 17 will be described with reference to FIG.
[0020]
The combustion heater 17 is connected to the water jacket of the engine body 3 via a water pipe W1, and the combustion heater 17 has a cooling water passage 17a therein for passing cooling water from the water jacket.
[0021]
The cooling water flowing in the cooling water passage 17a (indicated by a broken line arrow in FIG. 2) passes around a combustion chamber 17d which is a combustion section formed inside the combustion type heater 17, and burns during that time. It is warmed by the heat from the room 17d. This will be described sequentially below.
[0022]
The combustion chamber 17d includes a combustion tube 17b as a combustion source that emits a flame, and a cylindrical partition wall 17c that covers the combustion tube 17b to prevent the flame from leaking outside. By covering the combustion cylinder 17b with the partition 17c, a combustion chamber 17d is defined in the partition 17c. The partition wall 17c is also covered by an outer wall 43a of the combustion chamber main body 43 of the combustion type heater 17, and a space is provided between the two. By providing this space, the cooling water passage 17a is formed between the inner surface of the outer wall 43a and the outer surface of the partition wall 17c.
[0023]
The combustion chamber 17d has an air supply port 17d1 and an exhaust discharge port 17d2 directly connected to the air supply path 33 and the combustion gas discharge path 35, respectively.
[0024]
The air a1 flowing from the air supply path 33 enters the combustion chamber 17d from the air supply port 17d1 and travels therethrough to reach the exhaust discharge port 17d2, and then passes through the combustion gas discharge path 35 as described above. Flows into the main flow pipe 29 as air a2. Therefore, the combustion chamber 17d is in the form of an air passage through which the air a1 changed by combustion passes through the air a2 in the combustion type heater 17.
[0025]
After the combustion type heater 17 has burned, the air a2 returning to the main pipe 29 via the combustion gas discharge path 35 is the exhaust gas exiting from the combustion type heater 17, and therefore has heat. Until the heated air a2 exits from the combustion heater 17, the heat of the air a2 is transmitted to the cooling water flowing through the cooling water passage 17a through the partition wall 17c. warm. Therefore, the combustion chamber 17d is also a heat exchange passage.
[0026]
The combustion cylinder 17b includes a fuel supply pipe 17e connected to a fuel pump (not shown), and receives the pump pressure of the fuel pump therefrom to supply combustion fuel to the combustion cylinder 17b. The supplied combustion fuel is vaporized in the combustion heater 17 to become vaporized fuel, and the vaporized fuel is ignited by an ignition source (not shown).
[0027]
Such a combustion type heater 17 is operated at least when the starter motor is operated, that is, before the engine 1 is started by the starter motor. Therefore, the content of the air a4 flowing through the exhaust device 7 is different before and after the start of the engine 1 by the starter motor, and at least before the start of the engine 1, at least the combustion gas ( More precisely, it means only the air a3) in which the cylinder is warmed up before the engine 1 is started and the temperature is lower than before entering the engine body 3, and after the latter engine 1 is started, , Exhaust gas generated by combustion of the engine 1.
(Cooling water circulation)
Next, circulation of cooling water will be described.
[0028]
The cooling water passage 17a has a cooling water inlet 17a1 connected to the water jacket of the engine body 3, and a cooling water outlet 17a2 connected to the vehicle heater 9.
[0029]
The cooling water inlet 17a1 is connected to the water jacket of the engine body 3 via a water pipe W1, and the cooling water outlet 17a2 is connected to the vehicle interior heater 9 via a water pipe W2. The combustion heater 17 is connected to the water jacket of the engine body 3 and the vehicle interior heater 9 via the water pipes W1 and W2. Further, the vehicle interior heater 9 and the engine body 3 are also connected via a water pipe W3.
[0030]
By connecting the engine body 3, the combustion type heater 17, and the vehicle interior heater 9 using the water pipes W1, W2, and W3 in this manner, the cooling water in the water jacket of the engine body 3 starts from the water jacket. Then, the cooling water circulation passage 10 is formed, which flows in the following order from (1) to (3), returns to the water jacket again, and repeats this.
[0031]
If you elaborate the circulation of cooling water,
{Circle around (1)} The cooling water flows from the cooling water inlet 17a1 to the combustion heater 17 from the water jacket via the water pipe W1, where it is heated.
[0032]
The cooling water warmed in (2) reaches the vehicle interior heater 9 from the cooling water discharge port 17a2 of the combustion type heater 17 via the water pipe W2.
[0033]
{Circle around (3)} After the cooling water is subjected to heat exchange by the vehicle interior heater 9 and its temperature is lowered, or if the operation of the vehicle interior heater 9 is stopped, the cooling water passes without heat exchange. , And returns to the water jacket via the water pipe W3.
(Other components of the combustion chamber main body 43)
The combustion chamber body 43 includes a blower fan 45 and a central processing controller (CPU) 47 that is separated from an engine electronic control unit (ECU) 46 that controls the operation of the entire engine and exclusively controls the operation of the combustion heater 17. Having. If the combustion heater 17 is controlled by a CPU (not shown) of the ECU 46, the CPU 47 of the combustion heater 17 may be omitted.
(ECU 46 and related members electrically connected thereto)
The ECU 46 is electrically connected to various sensors such as a combustion gas temperature sensor and a rotation speed sensor (not shown) in addition to the engine water temperature sensor 40 a, the blower fan 45 and a fuel pump (not shown) via the CPU 47.
[0034]
Further, before starting the engine 1 by the starter motor, the random access memory RAM (not shown) included in the ECU 46 indicates how much the crankshaft is rotated based on the detection value detected by the engine coolant temperature sensor 40a, that is, the starter motor A map M as shown in FIG. 3 for determining the predetermined number of revolutions of the crankshaft is provided. The vertical axis of the map M indicates the predetermined number of revolutions of the crankshaft, and the horizontal axis indicates the engine coolant temperature. If the engine water temperature is determined from the map M, the predetermined rotation speed can be determined. When the engine water temperature is high, the predetermined rotation speed of the crankshaft by the starter motor is reduced, and when the engine water temperature is low, the rotation speed is increased. You can see that. The predetermined number of revolutions of the crankshaft obtained from the engine water temperature is a number that satisfies that the catalyst reaches a temperature sufficient for the catalyst to perform its function by the air a4 while the crankshaft is rotating the predetermined number of times. It means there is. The map M will be described in the section of the operation control routine.
[0035]
Then, the CPU 47 of the combustion type heater 17 operates according to each parameter of the various sensors, thereby controlling the combustion state of the combustion type heater 17. In other words, the CPU 47 controls the momentum, size, temperature and the like of the flame of the combustion type heater 17, and controls the temperature of the exhaust gas (combustion gas) of the combustion type heater 17 by this control.
[0036]
The parameters of various sensors such as the engine water temperature sensor 40a are temporarily stored in a read-only memory ROM (not shown) of the ECU 46, and are called up as needed.
(Fuel injection control routine)
Next, a fuel injection control routine by the injector will be described with reference to a flowchart of FIG.
[0037]
This routine is the first part of a normal flowchart (not shown) for driving the engine 1 and includes steps 101 to 107 described below. All operations in the following procedure are performed by the ECU 46. Then, using the symbol S, for example, if it is step 101, it is abbreviated as S101.
[0038]
In S101, it is determined whether an engine start control start condition is satisfied. The engine start control start condition means that the starter ON signal is output when the ignition switch is turned on. When the determination is affirmative in S101, the process proceeds to the next S102, and when the determination is negative, the routine ends.
[0039]
In S102, the engine coolant temperature is read from the value detected by the engine coolant temperature sensor 40a, and a predetermined number of rotations of the crankshaft by the starter motor is obtained from the map M in FIG. This predetermined number of revolutions is temporarily stored in the read-only memory ROM.
[0040]
In S103, it is determined whether or not the combustion heater 17 is in the OFF state. If an affirmative determination is made, the process proceeds to the next step S104, and if a negative determination is made, the process proceeds to S106.
[0041]
In S104, it is determined whether the starter motor is driving. If an affirmative determination is made, the process proceeds to the next S105, and if a negative determination is made, the process proceeds to S106.
[0042]
In S105, the combustion type heater 17 is operated.
[0043]
In S106, it is determined whether or not the rotation of the crankshaft by the starter motor has reached the predetermined number of revolutions stored in the ROM. If the determination is affirmative, the process proceeds to the next step S107; To end.
[0044]
In S107, fuel is injected into the cylinder by the injector.
<Effects of Embodiment>
Next, the operation and effect of the engine 1 according to the embodiment will be described.
[0045]
In the engine 1, the combustion heater 17 operates when the starter motor operates, that is, before the engine 1 rotates by itself. Therefore, at this time, the combustion gas emitted from the combustion type heater 17, that is, the air a2 (actually, the combustion gas mixed air a3 that has merged with the air a1 'at the connection point c2) is supplied to the piston in the cylinder by the rotation of the crankshaft by the starter motor. As the engine 1 reciprocates, it enters each cylinder from its intake port before the engine 1 itself rotates, and thereafter flows as air a4 from the exhaust port of each cylinder to the exhaust system of the engine 1. The temperature of the members in the exhaust passage is increased by the heat of the air a4 flowing into the exhaust system.
[0046]
As described above, the crankshaft is rotated by the starter motor attached to the engine body 3, and the combustion gas (air a3) of the combustion heater 17 flows into each cylinder before the engine 1 itself rotates. Therefore, all the cylinders are already heated evenly before the engine 1 itself rotates. Therefore, before the engine 1 itself rotates, the wall temperature of all cylinders increases equally and the friction decreases, so that the engine 1 can be started even when the outside air temperature is low and the engine cooling water is cold as a result of cold weather. Can be enhanced.
[0047]
Since the start of the fuel supply to the combustion chamber of the engine 1 is performed after the crankshaft is rotated a predetermined number of times by the starter motor, all the cylinders are sufficiently warmed by the heat of the air a3 before the engine 1 is started. Starts burning. As a result, the amount of unburned gas can be extremely reduced, so that the purification of the air a4, which is the exhaust gas of the internal combustion engine, can be improved.
[0048]
When the combustion gas (air a4) of the combustion heater 17 reaches the exhaust system before the engine 1 starts, the temperature of the members in the exhaust passage increases, and as a result, the catalyst temperature of the catalytic converter 39 also increases. The number of revolutions of the crankshaft determined from the engine water temperature is a number that satisfies that the temperature of the catalyst of the catalytic converter 39 reaches a temperature sufficient to exhibit its function by the air a4. When you do, the catalyst is already fully functional. Therefore, purification of exhaust gas can be further improved.
[0049]
Further, the predetermined number of revolutions of the engine 1 by the starter motor can be set low when the engine water temperature is high, and can be set high when the engine water temperature is low. Will be fully distributed to each cylinder. Therefore, it is possible to sufficiently warm up each cylinder before the engine 1 itself rotates. Therefore, since the starter motor is not restarted, the startability is improved. When the temperature is not cold, the predetermined number of revolutions of the engine 1 by the starter motor is correspondingly reduced, and as a result, the ratio of the combustion gas of the combustion type heater 17 reaching each cylinder is reduced, so that the starter motor is not operated more than necessary. May be. Therefore, there is no waste of energy.
[0050]
【The invention's effect】
As described above, according to the present invention, in an internal combustion engine designed to promote warm-up by introducing combustion gas from a combustion heater into an intake system of the internal combustion engine, it is possible to improve the startability and purify exhaust gas. Can be good.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of an internal combustion engine having a combustion heater according to an embodiment of the present invention.
FIG. 2 is a schematic sectional view of a combustion type heater.
FIG. 3 shows that a predetermined rotation speed of a crankshaft by a starter motor is set to the engine water temperature.
Map to ask for
FIG. 4 is a flowchart showing a fuel injection control routine by an injector.
[Explanation of symbols]
1. Engine (internal combustion engine)
3. Engine body (internal combustion engine body)
5. Intake device
7 Exhaust device
9 ... Heater for vehicle compartment
10. Cooling water circulation passage
13 ... Air cleaner
15 ... Turbocharger
15a ... Compressor
15b: Turbocharger turbine
17. Combustion heater
17a: Cooling water passage of combustion type heater
17a1 ... Cooling water inlet
17a2: Cooling water outlet
17b ... combustion cylinder
17c ... cylindrical partition
17d: Combustion chamber
17d1… Air supply port
17d2… Exhaust outlet
17e ... fuel supply pipe
19. Intercooler
21 ... intake manifold
23 ... intake pipe
25 ... upstream connecting pipe
27… Downstream connecting pipe
29… Main pipe (intake system)
31 ... Branch for heater
33 ... Air supply path
35 ... Combustion gas discharge path
37 ... Exhaust manifold
39 ... catalytic converter
40a ... engine water temperature sensor
41 ... Muffler
42 ... exhaust pipe
43… Combustion chamber body
43a ... outer wall
45… Blower fan
46 ... ECU
47 ... CPU
c1: Connection point between the air supply path 33 and the main pipe 29
c2: connection point between the combustion gas discharge passage 35 and the main pipe 29
M… Map
RAM: random access memory
ROM: Read-only memory
W1 ... Water pipeline
W2: Water pipeline
W3: Water pipeline
a1 ... Outside air (fresh air) entering the main pipe 29 from the air cleaner 13
a1 '... air flowing toward the connection point c2 without branching at the connection point c1
a2: Air that has been used as combustion gas by combustion of the combustion type heater 17
a3 ... Air mixed with combustion gas
a4: Exhaust gas of the engine 1 or air a3 in a state where the temperature is lower than before entering the engine body 3 by warming up the cylinders before the engine 1 starts.

Claims (4)

An internal combustion engine having a combustion heater that introduces combustion gas into an intake system of the internal combustion engine and thereby guides the combustion gas into a cylinder of the internal combustion engine to promote warm-up. This is performed when the engine rotation means attached to the internal combustion engine main body is operated, and after a predetermined number of rotations of the internal combustion engine by the engine rotation means, or after a predetermined time has elapsed from the start of the rotation after the rotation of the internal combustion engine by the engine rotation means. An internal combustion engine having a combustion-type heater, comprising: a fuel injection unit for injecting fuel for combustion in a combustion chamber of the internal combustion engine for the first time after the operation. The internal combustion engine according to claim 1, wherein the engine rotating means is a starter motor. The internal combustion engine having a combustion heater according to claim 1 or 2, wherein the exhaust system of the internal combustion engine has a catalytic converter as exhaust gas purifying means. The predetermined number of rotations of the internal combustion engine by the engine rotation means, or a predetermined elapsed time from the start of rotation of the internal combustion engine after rotation of the internal combustion engine by the engine rotation means, is small when the temperature of the engine-related elements is high, and is low when the temperature of the engine-related elements is low. An internal combustion engine having a combustion type heater according to any one of claims 1 to 3, wherein a large number is set.

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