JPH01502997A - Method for supplying additional excess amount at high temperature start of internal combustion engine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Conventional technology for supplying additional excess amount at high temperature start of internal combustion engine The present invention provides a high-temperature start-up as defined in the generic concept of claim 1 and claim 4. Starting from the time-addition excess supply method. Known circuit arrangement for hot starting of internal combustion engines (German Patent Application Publication No. 2410090), for example, Temperature-dependent switches located in the cooling water or other suitable locations of internal combustion engines. The main role of the fan motor is to connect the additional fan motor when the internal combustion engine is extremely hot. However, at the same time, this switch is used when starting the internal combustion engine at a high temperature. It is also used to detect the presence of a signal and to generate an appropriate electrical signal.

In order to provide an additional fuel surplus in case of such operating conditions of the internal combustion engine, Fuel normally provided in internal combustion engines during cold startup and warm-up phase of internal combustion engines A device for concentration is used. At that time, the temperature involved in the above-mentioned function of supplying thermal energy When the original NTC-resistance depends on the degree, then K can be obtained using an additional circuit arrangement as follows: In other words, the cold start enrichment device is activated or controlled when the engine temperature is particularly low. be made to work as in the situation, resulting in the desired additional fuel supply. It is operated or controlled so that it can be carried out.

The problem here is that the actual temperature of the internal combustion engine cannot be used as a reference. The addition must be metered independently of ambient influences and the actual temperature of the hot internal combustion engine. It is a must. Therefore, in order to maintain reliability, normal injection A particularly large lengthening of the pulse takes place. This is of course the second condition when starting at high temperature. , is carried out only if the internal combustion engine does not start within a predetermined period of time. during this period If you also use 1syttt for high-temperature starting of the engine that requires additional standby. Both are compatible with the respective type of internal combustion engine on the other hand, and are also compatible with the actual high speed of the internal combustion engine. Accurately meter the high-temperature start-up amount for a predetermined period of time depending on the temperature to ensure reliable Self-fueling (spontaneous) with easy start-up, good operating history and no unnecessary fuel supply The object is to provide a particularly cost-effective solution that ensures acceptance.

Advantages of invention The present invention solves the above problem as described in the characteristic parts of claims 1 and 4. Solved by configuration requirements.

The advantage of the invention is that it can be achieved by very few means, e.g. Additional configurable monitoring functions and switching for computer-controlled fuel injection systems function), and other engines with a changeover switch connected at the rear. A device configuration with a temperature monitoring circuit ensures that the internal combustion engine in question starts at a high temperature. It's something you can control.

Therefore, the present invention provides, on the one hand, a subsequent delayed delay occurring in a given internal combustion engine. Difficulties during hot starting with fuel intake are completely eliminated. Excessive fuel addition is reliably avoided and the fuel addition actually required by the internal combustion engine is reduced. only can be supplied during hot start. In this case, the amount of fuel added may vary depending on the case. A device that also participates in supplying an additional excess amount at the time of starting an internal combustion engine at room temperature using two room temperature starting valves. metered and supplied via. Corresponding additional excess supply at cold start with normal injection Even in the case of a fuel stoichiometry device via a valve, the present invention makes it possible to Used to supply additive amounts.

In the present invention, the restart function at normal temperature start is dependent on the known engine temperature (TMOT). As with NSA, when the engine is at operating temperature, A special restart additional excess amount supply NSA is performed.However, at that time, at the time of restart The additional excess supply depends on the intake air temperature TANS. Therefore, the characteristic part of the present invention According to the description in , the height of this intake air temperature TANS is the engine It is a measure of the thermal state. In this case too, the fuel addition to be provided for hot starting The quantity is filed accordingly as the high temperature starting characteristic curve NSA*=f (TANS). It is. This additional amount is then reduced over time to a relatively small value.

A special advantage of the present invention here is that the high temperature starting characteristic function reduces costs. , is combined with the normal restart additional excess supply characteristic function for cold start by K as follows: It is to be done. That is, in a corresponding computer-controlled fuel injection system, the front Configurable and programmable engine temperature threshold, TMOT-threshold From then on, the normal normal temperature starting characteristic curve no longer works, and the high temperature starting characteristic curve NS- are coupled in such a way that they are put into operation by switching.

Further configurations and developments of the invention are the subject of the embodiment section and are disclosed therein. There is.

drawing Embodiments of the invention are illustrated in the flowchart diagrams of the drawings and are described in detail below. .

Description of examples The present invention will now be described with reference to a flowchart diagram for a computer-controlled fuel injection system. I will explain. However, the invention is not limited to this embodiment, but can be modified in many ways. In addition to the type, the individual circuit elements can be arranged, for example, by controlling the fuel metering by corresponding final control actuating elements. An application form in which the functions are integrated into five functional blocks is also possible. The present invention also provides fuel injection. However, the application is not limited to application in shooting equipment.

However, in the fuel supply system used each time, the normal temperature starting temperature that can be used in the present invention is It is assumed that a device is provided to prevent excess supply during operation.

The present invention utilizes an intake air temperature sensor. This intake air temperature sensor is a common In a fuel injection device and its control device, the amount of air taken into the internal combustion engine or is necessary in any case to accurately detect and calculate the amount of air supplied to the internal combustion engine. It is essential. The present invention also allows the output signal of this intake air temperature sensor to It is used as an address for scanning detection of the amount of added fuel. This fuel addition 77 of the additional excess amount supply at the time of restart at high temperature start in the form of a characteristic white assembly process. information about the intake air temperature is stored in a suitable storage device as "FNS"). . In the case of computer-controlled fuel delivery systems, each microprocessor or can use sufficient storage (FROM) in a small computer, Then, in this memory device, the characteristic curves described above are stored in each case for the type of internal combustion engine to which it belongs. It can be specially adapted and stored. The typical characteristic curve of this type is 3I. A is shown in function block 13 of the flowchart diagram on page 1. in this case, At a predetermined temperature t, the additional excess amount supply function at high temperature start starts, and the intake air A relatively large 7-actor value FNS Qin is obtained as the temperature increases. Implications of the above Regarding the temperature, the characteristic curve for high-temperature starting is curve approximately in the opposite direction (inversely) to the characteristic curve for. Starting at room temperature The characteristic curve of the dynamically added excess supply reservoir is likewise simply a qualitative representation of the flowchart in the drawing. This is shown in block 13 of the diagram.

As can be seen from the flowchart diagram, at the beginning of the start-up process corresponding to block 10 First, in block 11, check whether the normal program starts or restarts the program. A determination is made whether to execute the program. This should always be done in the following cases: i.e. the engine temperature and correspondingly the ambient temperature of the engine are also very low; Therefore, a normal temperature (or cold) start or a corresponding high temperature start/restart process is applicable. KI/i always It is done. If so, in block 12, the computer control The engine temperature TMOT, which is always taken out to the injection device in any case, is at a predetermined dark value TS. It is further determined whether or not it exceeds W. For example, setting the temperature to 40℃ If this threshold value is exceeded, a cold start-restart block 13 is substituted for a high-temperature start-up. is switched to the restart block 13* and its characteristic curve NSA”: f (T ANS) will be evaluated. Then, a hot start is performed depending on the detected intake air temperature. A predetermined restart additional excess amount supply 2 actor value FNS Qin is set for this factor. The data value is fed to a newly provided addition point 15.

From this point on, the normal existing cold start-additional excess supply function remains unchanged. (if necessary, for hot start, via a cold start valve) (including additional fuel injection). Therefore, in the present invention, in addition to the decision block 12, an additional In general, it simply has a new characteristic curve block 13*), and in some cases The time function shown by the dashed line 14 (by this, the value obtained based on the curve g FNS Qin is (adjusted depending on the time). The above happens when starting at high temperature. The additional excess amount can be supplied at relatively high speed.

matter, either alone or in any combination with each other, is essential to the invention. It is.

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Claims (5)

[Claims] 1. For example, electronically controlled fuel injection equipment and cold start and warm-up phases of internal combustion engines detects the temperature of the internal combustion engine in order to meter the temperature-dependent amount of fuel added when A method for supplying an additional excess amount at a high temperature start of an internal combustion engine having an NTC-sensor that The engine temperature (TMOT) is continuously monitored and a predetermined temperature threshold (TMOT W), the area where additional excess amount is supplied at normal temperature start is determined by the intake air of the internal combustion engine. Excessive addition at high temperature starting, which depends on the air temperature (TANS) and has an opposite characteristic course. It is characterized by switching to the characteristic curve (FNS■=f(TANS)) for quantity supply. A method for supplying an additional excess amount at high temperature start of an internal combustion engine. 2. Is the high temperature starting characteristic curve (FNS■=f(TANs)) at the predetermined intake air temperature value? The characteristic curve starts to act from the point where the temperature rises, and the characteristic curve increases as the temperature increases. A method for supplying an additional excess amount at high temperature startup of an internal combustion engine. 3. While maintaining the additional fuel supply function at normal temperature start, the engine temperature threshold (TMOTSW ), only when the corresponding The additional fuel amount supply function is activated and the additional amount supplied each time is reduced depending on the time. Additional excess amount supply at high temperature start of an internal combustion engine according to claim 1 or 2. Method. 4. For example, electronically controlled fuel injection equipment and cold start and warm-up phases of internal combustion engines detects the temperature of the internal combustion engine in order to meter the temperature-dependent amount of fuel added when This is an additional excess amount supply device at the time of high temperature starting of the internal combustion engine, having an NTC-sensor that Accordingly, an apparatus for carrying out the method according to claims 1 to 3 above is provided. A switching device is provided which is controlled depending on the engine temperature, and the switching device is controlled depending on the engine temperature. Therefore, the device that performs additional excess supply (NSA) at restart for normal temperature startup is It operates according to a characteristic curve corresponding to the supply of additional fuel depending on the inlet air temperature. An additional excess amount supply device at the time of high-temperature starting of an internal combustion engine, characterized by the following. 5. High-temperature start--Characteristic curve block (13■) for additional excess supply at restart , a time block (14) is connected downstream which reduces the addition amount in a time-dependent manner. An additional excess amount supply device at the time of high temperature start of an internal combustion engine according to claim 4.