KR20010050302A - Method for operating of engine - Google Patents

Abstract

PURPOSE: A method for operating engine is provided for operating all engines of same type in optimum through operation period. CONSTITUTION: A fuel is injected into a combustion chamber(4) in at least two modes. And the two modes are switched depending on an operating mode characteristic field. The operating mode characteristic field is adapted depending on the operating parameters of the internal combustion engine. An Independent claim is also included for a control element and a controller for an internal combustion engine.

Description

How the engine works {METHOD FOR OPERATING OF ENGINE}

The invention relates in particular to a method of operating an engine of a vehicle, in which fuel is injected into the engine in at least two modes of operation and is switched between the two modes of operation according to the characteristic area of the mode of operation. The invention also relates to a control device for this type of engine.

Engine operating methods and engine control devices of this type are known as examples for fuel direct injection engines. The fuel is then injected into the combustion chamber of the engine during the intake phase in homogeneous operation and during the compression phase in stratified operation. Homogeneous operation is suitable for full loads of the engine, while stratified operation is suitable for idle and partial loads. For example, in a fuel direct injection engine, the two modes of operation described above operate according to the desired target mode of operation.

In order to switch between these two modes of operation, the control unit is provided with an operating mode characteristic area in which the operating modes associated with each operating point of the engine are stored. This mode of operation characteristic area is equally provided in the control device in the manufacture of the same kind of engine.

There is identity and diversity among engines of the same type. In addition, the engine ages over time. The stored mode of operation for each operating point results in a case in which, after a certain time has elapsed, in some cases it can no longer be optimal for each engine. However, this does not mean that each engine can no longer be operated optimally.

It is an object of the present invention to provide an engine operating method which allows all engines of the same type to operate optimally over the entire operating period.

This object is solved through the above-described method according to the invention in which the mode of operation characteristic region is adapted according to the operating parameters of the engine. The object in the engine and control device in the manner described above is also solved accordingly according to the invention.

The mode of operation characteristic area is automatically and continuously optimized over the entire operating period of the engine. In this way, the engine always operates optimally. Through the operating characteristics field, the diversity and aging of engines of the same type are automatically compensated for. The optimum mode of operation is stored within each time point relative to the operating point of the engine, within the mode of operation characteristic.

In the configuration of the present invention engine efficiency and / or engine silent running degree and / or exhaust gas emissions are determined as operating variables. Such operating variables are particularly advantageous for adaptation to the operating mode characteristic area and for optimization of engine operation.

In an advantageous configuration of the invention operating parameters for the current operating point and the engine current operating mode are determined. That is, operating variables are always provided depending on the mode of operation and the operating point. This simplifies the method as a whole and makes subsequent comparisons easier.

In the advantageous configuration of the present invention, various modes of operation for the same operating point are compared with each other. That is, a comparison is made according to the operating point with which the variables of the various modes of operation concerned are compared with each other. This comparison determines the effectiveness of the various modes of operation at a given operating point. The efficiency is related to the above-described operating parameters, for example, the efficiency and / or quietness of the engine and / or the exhaust gas and the like.

Another advantageous configuration of the invention is that the optimal mode of operation for the operating point is selected according to the comparison and recorded in the mode of operation characteristic area. Also, based on this comparison, one of the modes of operation is determined and selected as the optimum mode of operation. This optimum mode of operation is stored in the mode of operation characteristic area.

In this way, the mode of operation characteristic region is always optimally adapted during the entire operating period of the engine. Diversity between engines of the same type or aging of the engine is automatically compensated for during engine operation.

It is particularly important that the execution of the method according to the invention is provided in the form of a control element for the engine control device of the vehicle. Suitable for carrying out the method according to the invention, an executable program is stored in the computing device of the control element, in particular in the microprocessor. In this case, the present invention is executed by a program stored in the control element so that the control element provided with the program implements the present invention as well as a proper method of executing the program. As the control element, in particular, an electrical storage medium, for example read-only-memory or flash-memory, can be used.

Other features, possibilities, and advantages of the present invention are described in the embodiments of the present invention with reference to the drawings. Irrespective of the gist of the claims or their recursive relationship and regardless of the form or drawings of the specification, all features described or illustrated are themselves or optionally combined with the subject matter of the invention.

1 is a schematic view showing one embodiment of an engine according to the present invention;

2 is a schematic block diagram of an embodiment for a method according to the invention for operation of the engine of FIG.

<Explanation of symbols for main parts of drawing>

1: engine

2: piston

3: cylinder

5: intake valve

6: exhaust valve

7: intake pipe

10: spark plug

11: throttle valve

16: fuel tank ventilation line

18: control device

21: How does it work? Properties area

26: comparison device

1 shows a vehicle engine 1 in which a piston 2 is capable of reciprocating within a cylinder 3. The cylinder 3 has a combustion chamber 4 which is restricted via a piston 2, an intake valve 5 and an exhaust valve 6. The intake valve 5 is connected to the intake pipe 7, and the exhaust valve 6 is connected to the exhaust pipe 8.

In the region of the intake valve 5 and the exhaust valve 6, the injection valve 9 and the spark plug 10 protrude into the combustion chamber. Fuel is injected into the combustion chamber 4 through the injection valve 9. Fuel may be ignited in the combustion chamber 4 by the spark plug 10.

A rotatable throttle valve 11 is arranged in the intake pipe 7 so that air is supplied into the intake pipe 7. The amount of air supplied depends on the angle of the throttle valve 11. The exhaust converter 12 is disposed in the exhaust pipe 8 and used to purify the exhaust gas generated through combustion of the fuel.

The exhaust gas recirculation pipe 13 is connected back to the intake pipe 7 from the exhaust pipe 8. An exhaust gas recirculation valve 14 is disposed in the exhaust gas recirculation pipe 13, and thus the amount of exhaust gas recycled into the intake pipe 7 may be adjusted. The exhaust gas recirculation pipe 13 and the exhaust gas recirculation valve 14 recycle the exhaust gas.

A fuel tank vent line 16 is connected from the fuel tank 15 to the intake pipe 7. The fuel tank vent line 16 and the fuel tank vent valve 17 ventilate the fuel tank.

The piston 2 is converted to reciprocating motion by the combustion of fuel in the combustion chamber 4 and transferred to a crankshaft, not shown, in which torque is formed.

The control device 18 is actuated by an input signal 19 representing the engine operating parameters measured by the sensor. The control device is connected to, for example, an air mass sensor, a lambda sensor and a rotational speed sensor. In addition, the control device 18 is connected with an accelerator pedal sensor that generates a signal which gives the position of the accelerator pedal operated by the driver and the torque required thereby. The control device 18 generates an output signal 20 that can affect the operation of the engine 1 via an actuator or regulator. In addition, the control device 18 is connected, for example, with the injection valve 9, the spark plug 10 and the throttle valve 11 to generate the signals required to adjust them. The control device 18 is provided, among other things, to control or adjust operating parameters of the engine 1. For example, the amount of fuel injected into the combustion chamber 4 through the injection valve 9 is controlled or adjusted by the control device 18 in particular in view of low fuel consumption and / or low generation of harmful substances. For this purpose, the control device 18 has a microprocessor in which a program suitable for carrying out the control or adjustment is stored in the storage medium, in particular in the flash memory.

The engine 1 of FIG. 1 can be operated in a number of modes of operation. This makes it possible for the engine 1 to operate in homogeneous operation, laminar operation, homogeneous lean operation, laminar operation based on homogeneous operation, and the like.

The fuel is injected directly into the combustion chamber 4 of the engine 1 by the injection valve 9 during the intake phase in homogeneous operation. This continues to vortex until the fuel is ignited, resulting in essentially a homogeneous air-fuel ratio in the combustion chamber. The generated torque is adjusted via the position of the throttle valve 11 by the control device 18. In homogeneous operation the operating parameters of the engine 1 are controlled and / or adjusted such that the lambda is equal to one. Homogeneous operation applies especially at full load. Homogeneous lean operation is consistent with homogeneous operation, but lambda is adjusted to a value of 1 or more.

The fuel is injected directly into the combustion chamber 4 by the injection valve 9 during the compression step in laminar operation. As a result, a fuel layer, rather than homogeneous mixing, is formed in the combustion chamber 4 at the time of ignition of the spark plug 10. In a category that does not take exhaust gas circulation and / or fuel tank ventilation into account, the throttle valve 11 may be fully open and the engine 1 may be operated with the throttle valve fully open. The torque generated is regulated by the amount of fuel in the stratified operation. The engine 1 can be operated in layered operation, especially at idle and partial loads.

The aforementioned modes of operation of the engine can be interchanged. This type of switching is performed by the control device 18. In addition, according to FIG. 2 there is provided an operating mode characteristic region 21 in which the operating mode associated with each operating point of the engine 1 is stored.

The operating point of the engine 1 at the time of operation of the engine 1 is determined by the control device 18 using the operating state grasp device 22. The device 22 grasps, for example, the engine 1 rotation speed, the engine temperature, the position of the accelerator pedal, and the like. According to this operating variable of the engine 1, the mode of operation associated with each time point of engine 1 operation is read out from the mode of operation characteristic region. In this way, the engine 1 is operated in a read mode of operation, for example, in layer operation or homogeneous operation.

The mode of operation characteristic region 21 is identically embedded in the control device 18 in the manufacture of engines of the same type. Because of the diversity and aging phenomena between different engines of the same type, the stored modes of operation for the various operating points in the mode of operation characteristic region 21 can no longer be optimal, especially after a certain period of operation of the engine 1.

In FIG. 2 a block diagram is shown schematically for how the mode of operation characteristic region 21 can be adapted and optimized for operation of the engine 1.

The efficiency grasp device 22 determines the engine 1 efficiency with respect to the actual operating point. This is measured, for example, from the amount of fuel injected and the torque actually generated.

The injected fuel amount can be calculated on both sides of the injection valve 9 from the injection time and the pressure difference. The fuel amount can be measured using the fuel amount sensor in the fuel supply line. The injection time can be measured by measuring the path of the current in the final stage of the relevant injection valve or by the open time sensor of the injection valve.

The torque generated can be measured by the torque sensor of the engine 1 crankshaft. In addition, a combustion chamber pressure sensor is provided to calculate the torque. The torque can be measured from the speed of rotation and the knock signal of the knock sensor, for example. The engine power can be calculated from the generated torque via the engine 1 revolutions. The quiet operating device 23 measures the engine 1 quietness relative to the actual operating point.

In addition, a rotational speed sensor to the crankshaft and / or a combustion chamber pressure sensor in the cylinder of each of the engines 1 and / or a torque sensor and / or an ion current probe of the crankshaft may be used. The speed change or torque injection is derived from the output signals of these sensors, from which the quiet operation of the engine 1 is induced.

The exhaust gas measuring device 24 measures NOx emissions and / or HC emissions of the engine relative to the actual operating point.

In addition, the NOx sensor and / or HC is used in the exhaust pipe 8. The NOx part in the exhaust gas can be measured from the operating parameters of the engine 1, in particular the operating parameters for the charging and discharging control of the converter 12. HC emissions can likewise be measured from the operating parameters of the engine 1, in particular from the quiet operation of the engine. NOx and HC emissions are additionally or selectively normalized by the control device 18.

The efficiency measuring device 22, the quiet operation measuring device 23 and the exhaust gas measuring device 24 provide characteristic values for each actual operating point of the engine. The engine operates at each of these operating points in their actual operating mode. In this way, the determined characteristic value is applied to a constant operating point and a constant mode of operation.

These operating modes and characteristic values according to the operating points are transmitted to the operating mode evaluation device 25.

The mode of operation evaluation device 25 generates one or more comparison values for each mode of operation from a given characteristic value. The comparison value is determined through a combination of characteristic values input from the control device 18 according to a predetermined mathematical method.

The comparison value according to the operating mode and operating point is transmitted to the operating mode comparing device 26.

Comparison values for the various modes of operation and various operating points of the engine 1 are collected in the mode of operation comparison device 26. In this way, a comparison value relating to the operating point of the engine 1 based on various modes of operation is provided after a certain time.

The same operating point of the engine, but this comparison of the various modes of operation are compared with each other. From these comparisons, an optimal mode of operation for a given operating point is selected based on the comparison.

This optimum mode of operation is recorded in the mode of operation characteristic area 21 for a given engine 1 operating point.

In this way the mode of operation characteristic region 21 is always adapted and optimized during the entire operating period of the engine 1. Diversity between engines of the same type or aging of the engine is thereby automatically compensated during operation. The mode of operation characteristic region 21 is automatically and continuously optimized through the method shown in FIG. 2 so that the optimum mode of operation for the operating point is always present in the mode of operation characteristic region 21 during the entire operating time of the engine 1. Stored.

According to the invention, the engine is always operated optimally during the entire operating period by means of a control device provided with an operating mode characteristic region, thereby providing the best engine efficiency.

Claims (9)

In particular in the method of operating the vehicle engine 1, fuel is injected into the combustion chamber 4 in at least two modes of operation and switched between the two modes of operation according to the mode of operation characteristic region 21. Method of operation of a vehicle engine, characterized in that the mode of operation characteristic region (21) is adapted according to the operating parameters of the engine (1). Method according to claim 1, characterized in that it comprises steps (22, 23, 24) in which the efficiency and / or quietness and / or exhaust gas of the engine (1) are determined as operating variables. Method according to one of the preceding claims, characterized in that the operating parameters for the actual operating point and the actual mode of operation of the engine (1) are determined. 4. A method according to any one of the preceding claims, characterized in that it comprises a step (25) in which the comparative variable according to the mode of operation and the operating point is determined from the operating variable. 5. A method according to claim 4, characterized by the step (26) of comparison variables of different modes of operation for the same operating point being compared with each other. 6. A method according to claim 5, characterized in that the optimum mode of operation for the operating point is selected according to the comparison and recorded in the mode of operation characteristic region. Particularly a ROM or flash memory, especially for a control device for a vehicle engine, characterized in that the program suitable for carrying out the method according to any one of claims 1 to 6 is executable in the calculator, in particular in a microprocessor. Control elements such as. Especially in a vehicle engine 1, having a combustion chamber 4 in which fuel is injected in at least two modes of operation and an operating mode characteristic region 21 for switching between the two modes of operation, The engine, characterized in that the mode of operation characteristic region 21 is adapted according to the operating parameters of the engine 1 via the control device 18. The engine 1 has a combustion chamber 4 in which fuel is injected in at least two modes of operation and is provided with an operating mode characteristic region 21 for switching between modes of operation, in particular for the engine especially the vehicle engine 1 In the device 18, The control device characterized in that the mode of operation characteristic area (21) is adapted via the control device (18) according to the operating parameters of the engine (1).