JPH06506517A - A method for starting a piston type combustion engine at room temperature and a device for carrying out the method - Google Patents

Abstract

The invention relates to a method and device for coldstarting of piston-type combustion engines. During a first step, the blocking of the fuel supply to the engine's combustion chambers is ensured during cranking of the engine, whereby air is compressed in the engine for the purposes of warming up the engine's combustion chambers by generated compression heat. During a second step, fuel supply is effected during further cranking until ignition occurs, whereby the first step is continued for a predetermined number of revolutions of cranking of the engine.

Description

[Detailed description of the invention] Piston type combustion engine normal temperature starting method and equipment for carrying out the method; Technical field The present invention provides a method for starting a piston-type combustion engine at room temperature and implementing the method. It is related to the device.

Current state of technology While a piston-type combustion engine is started at room temperature, combustion is incomplete and other combustion occurs. releases undesirably high concentrations of hydrocarbons during production. What kind of surroundings does this mean? Although it occurs at ambient temperature, it increases when the ambient temperature is low. Therefore, normal operating temperature It is important to reach speed. The most common way to do this is to introduce It is to preheat the air. However, this requires a large amount of space within the inlet manifold. The drawback is that it requires an electric heating element, which is expensive.

Description of the invention The purpose of the invention is to improve the engine as much as possible without providing a heating element on the inlet side of the engine. The above-mentioned problem when starting the engine can be solved economically and effectively by making it possible to heat the engine quickly. It is decided.

Hereinafter, in this specification, "cranking" refers to cranking of an engine by a starter motor, etc. Refers to the operation of rotating the shaft externally to help start the engine.

This object can be achieved by the method of the invention, and the piston type combustion machine of the invention The normal temperature starting method involves starting a piston-type combustion engine at room temperature. During engine engine combustion, the supply of fuel to the combustion chamber of the engine is reliably blocked and air is compressed within the engine. The first stroke raises the temperature of the combustion chamber of the engine by the heat of compression generated by the compression, and the second stroke During cranking of the engine, the second stroke consists of supplying fuel until ignition occurs. The first stroke is continued during a predetermined cranking rotation speed.

Moreover, this object can be achieved by the device of the invention, and the piston type of the invention A combustion engine cold start method implementation device is a device that performs a combustion engine cold start method by cranking the engine using the starter device. In a device that implements a method for starting a piston combustion engine at room temperature, the first row During this process, the fuel supply to the engine is blocked for a predetermined number of engine cranking revolutions. The fuel supply is blocked during the second stroke. characterized in that it comprises a control unit configured to interrupt.

Drawing description The invention will now be explained in more detail by way of two exemplary embodiments with reference to the accompanying drawings, in which: FIG. Attached diagram FIG. 1 diagrammatically shows the configuration of a normal temperature start according to a first embodiment of the present invention. FIG. 2 diagrammatically shows a part of a device according to a second embodiment of the invention.

Preferred embodiment As shown in FIGS. 1 and 2, the device of the present invention includes an exhaust gas of a piston-type combustion engine. Is there a throttling device 11 placed on side 2, for example between the manifold and the exhaust pipe? suitable. The fully closed position completely closes the exhaust side and the throttle device does not contribute to pressure drop. The valve 3 of this throttling device is configured such that it can be continuously adjusted variably between the fully open position and the fully open position. place In the fully closed position, this throttling device completely blocks the exhaust side, thereby closing the valve. 3, or completely seal the installed valve seat 4. Alternatively, add an air hole to this valve. It is also possible to provide a vent so that the exhaust side is not completely blocked. Adjusting the aperture device 5 controlled by. For example, the adjustment part 5 is pneumatically controlled by the air system belonging to the vehicle. Therefore, control. by means of a spring-loaded piston 7 movable in a single-acting air cylinder 8. The adjustment section 5 is configured by the following. This single-acting pneumatic valve is operated through an electrically adjustable solenoid valve 9. The air cylinder 8 is connected to an air supply source. configured and arranged to control the throttling device; A single-acting air cylinder 8 is connected to a control unit lO which also cooperates with other functions. 1st The embodiment shown in the figure is a body which means that the compression spring 6 acts to keep the valve open. A tube-shaped squeezing device is shown. Air cylinder opposite the compression spring with respect to the piston By supplying various air pressures into the cylinder 8, the valves are adjusted. Therefore, air When the force acting on the piston due to pressure is higher than the spring pressure, the maximum throttle position is reached. . In the embodiment shown in FIG. 2, the spring acts on the piston 7 in the opposite direction, i.e. This figure shows a negative operation configuration in which the spring tries to maintain the maximum aperture position.

In this case, air pressure is supplied to the opposite side of the spring with respect to the piston, and if the air pressure is sufficient This creates an actuation movement that opens the valve.

Examples of inputs to the control unit are human control power 11 from the vehicle's ignition key and the exhaust side. , for example, a temperature sender that detects the temperature in each cylinder, and a rotation count sender. , a rotation speed calculator, a second control input from any transmitter such as a timer, etc. Also, Cooling fluid temperature or lubricating oil by sender to control control unit lO Temperature can be detected. As mentioned above, the control unit 10 is connected to a solenoid. to the valve 9, this connection being made through an output 13 from the control unit 10. cormorant. Additional outputs from the control unit IO can be used, for example, for starting motor regulators of combustion engines. and an output 15 to the engine fuel injection system. -As an example If you choose a diesel engine, it will not have an electric ignition system.

The device of the invention is particularly simple in construction and suitable for use in several types of engines, such as diesel engines. It is cost-effective to apply. This is practically the case for heavy vehicles such as trucks. The exhaust pressure regulator, which is part of the standard equipment of diesel engines, is used as a throttling device. This is because it is possible. engine to reduce the load on normal braking equipment. Artificial loading of the engine to very high levels to act as a gin brake Conventionally, this exhaust pressure regulator has mainly had the function of adding. For example, the driver's seat of a vehicle , this function is achieved through an electrical brake contact that produces an input, e.g. input 12. is connected to control unit l-10. Furthermore, the exhaust pressure regulator is completely , or by an artificial load caused by partially closing valve 3. Raise the temperature even faster. This is because resistance pressure is generated within the engine. Burning After injection of the fuel, this resistive pressure is utilized to produce the next ignition.

The method and apparatus of the invention provide a novel method for additionally increasing the temperature of the engine up to its operating temperature. There are more facts. At the beginning of cranking of the diesel engine by the starting motor The control unit IO, on the other hand, can also Preventing fuel injection into the diesel engine and preferably on the other hand, obtaining a maximum throttle on the exhaust side. Activate the throttle device to achieve an additional increase in engine temperature up to operating temperature. to be accomplished. Therefore, no fuel ignition takes place during this first step of the method. So This is because no fuel is supplied to the cylinder chambers of the engine. However, the institution The piston inside is still compressing the air contained within the cylinder and at the same time , the fully or partially closed throttle device 1 generates a resistance pressure on the exhaust side, and this resistance Resistant pressure increases the compression rate and reduces the flow through the cylinder . This generates compression heat due to compression in the cylinder chamber, and the diesel engine The walls of the cylinder chamber are heated even before starting ignition and operation. This method of this In the second step, which is directly connected to the first step, during fuel injection, the output of the control unit lO is A resistive pressure is subsequently maintained by a throttling device l actuated by one of the The fuel ignites, and the force causes the engine to rotate. During this second step, maintained Resistance pressure can be applied over a suitably selected heating period to additionally quickly apply the engine. heat. Next, in the third step following this second step, the valve 3 of the throttle device l is completely closed. Adjustment to the open position substantially ends the resistive pressure. Must When necessary, instead of this normal operating state, control manual input I2 to the control unit IO can be applied. Operated by the driver, the throttle device is adjusted to the fully closed position and the engine brake is activated. may be increased. By means of a control output 15 which controls a fuel injection device known per se. prevents fuel injection. This prevention of fuel injection is achieved by a control input to the control circuit. This control circuit detects the number of revolutions of the crankshaft and This fuel injection block is released after the engine revolution. This predetermined rotation speed is one complete working cycle, i.e. at least one compression line for each cylinder. It corresponds to the degree. Although this is preferable from the perspective of maintaining a good environment, From the point of view of increasing It can be carried out.

Further, the rotation speed can be controlled depending on the temperature of the cooling fluid or lubricating oil.

The appropriate resistance pressure can be selected depending on many factors, but the highest resistance pressure , that is, the highest resistance pressure with the throttle device completely closed, and the valve 3 in the fully open position and completely closed. and a reduced resistance pressure of e.g. 100 kPa at an intermediate position between the , the resistance pressure can be changed. Is the exhaust pressure pulsating during operation? During the first and second steps of this method, this squeezing device is pressed by a spring. It also pulsates.

In practice, the engine should be clamped by the starting motor, taking into account the necessary adjustment time of the throttling device. The arrangement is such that the throttling device 1 is already in operation when quenching. fuel injection a first position for adjusting the throttle device l to a predetermined throttle position; This is possible because the ignition key has a second position that activates the motor. It is Noh. The selected resistance pressure can also be maintained by a time control device, Therefore, it is preferable to provide a timer in the control unit IO, and the engine cranking After a predetermined period of time calculated from the activation of Make fuel injection. Similarly, until the second step of this method progresses to the third step, For a fixed period of time, this timer maintains the adjusted aperture position of the aperture device. Wear.

The invention is not limited to the embodiments shown and described in the drawings, but within the scope of the claims of the invention. Various changes can be made. For example, by completely removing the throttling device. or other structures. In addition, one piece common to all cylinders is Instead of placing a throttling device in each cylinder, a throttling device is placed in each cylinder and each cylinder is individually It may also be possible to control. This means that these cylinders will eventually differ This is because the operating temperature is reached. Although the invention is particularly advantageous when ambient temperatures are low, , the invention is advantageous regardless of engine temperature and ambient temperature. In principle, the original The obvious method simply has the gist of blocking fuel injection. As an example, diesel engine However, the present invention is applicable to other types of piston-type combustion engines and electrical point combustion engines. Suitable for combustion engines with fire equipment.

The invention can be used with various types of fuel. In addition, the present invention Even for fuels that have a low tendency to evaporate, i.e. fuels with high evaporation temperatures such as alcohol, Many favorable effects can be achieved.

l11. mmsmm5taH6+k Pσ/SE 92100216 International Research Report notice :;-2:-2;;the,;F2-2;;;“+?zt;;==:;1;: t==:;;=j1. =,;i;1==-d−k　−1”t狽Ves*ni°1 °−1 T floor-1sh k-〇tnem Im l++ w ff N@@a Nr l hw-man-111-1 Sir $Isrl1w p m 1m | Continuation of front page (81) Designated countries EP (AT, BE, CH, DE.

DK, ES, FR, GB, GR, IT, LU, MC, NL, SE), 0A (BF , BJ, CF, CG, CI, CM, GA, GN, ML, MR, SN, TD, TG. ), AT, AU, BB, BG, BR, CA, CH, C3, DE.

DK, ES, FI, GB, HU, JP, KP, KR, LK, LU, MG, MN, MW, NL, No, PL, RO, RU, SD, SE, US

Claims (11)

[Claims] 1. When starting a piston-type combustion engine at room temperature, it is necessary to The pressure generated by compressing the air inside the engine is The first stroke increases the temperature of the engine's combustion chamber through heat contraction, and the next stage is cranking. The engine cranking process consists of a second stage in which fuel is supplied until ignition occurs, and a second stage in which fuel is supplied until ignition occurs. A piston-type combustion machine, characterized in that the first stroke continues for a predetermined number of rotations. How to start at normal temperature. 2. continuing said first stroke for at least one complete operating cycle of the engine; The method according to claim 1, characterized in that: 3. controlling a time delay between the first step and the second step according to temperature; The method according to claim 1 or 2, characterized in that: 4. A time delay between the first stroke and the second stroke is controlled according to the temperature of the engine. The method according to claim 3, characterized in that: 5. In the first stroke, while the engine is cranking, the exhaust side of the engine is throttled. Any one of claims 1 to 3, characterized in that resistance pressure is applied to the exhaust side of the The method described in. 6. The throttle on the exhaust side of the engine is performed before cranking of the engine. A method according to any one of the preceding claims. 7. A piston-type combustion engine is brought to room temperature by cranking the engine using a starter. During the first stroke, the cranking point of the engine is It is configured to send a control signal to prevent the supply of fuel to this engine during a constant rotational speed. control configured to interrupt this fuel supply blocking during the second stroke. Practical method for starting a piston-type combustion engine at normal temperature, characterized by comprising a unit (10) Application equipment. 8. A throttle device (1) is provided on the exhaust side of the engine, and before fuel is supplied, during the first stroke. During cranking of the engine, the throttle device is used to apply resistance pressure to the exhaust side of the engine. The control unit (10) is configured to maintain the position (1) in the aperture position. 8. The device of claim 7, characterized in that: 9. As soon as the engine is cranked, resistance pressure is generated on the exhaust side of the engine. and to maintain the throttle device (1) in the throttle position before activating the starting motor. The apparatus according to claim 8, characterized in that the control unit (10) comprises: Place. 10. a movable diaphragm that is spring-loaded so that the diaphragm device maintains the diaphragm position; Claims characterized in that the means (7) is provided in the aperture section (3) of the aperture device. 9. The device according to 9. 11. a first position for actuating the throttle device; and a second position for actuating the starter motor. 10. Device according to claim 9, characterized in that the engine's ignition key has a position.