JPS6114438A - Engine starting system - Google Patents

Abstract

PURPOSE:To eliminate the choke system by discriminating between pre-start of engine, under cranking and post completion of starting combustion while controlling the fuel with correspondence to the discriminated engine operating condition. CONSTITUTION:In step 101, it is decided whether the ignition switch is turned on. On the basis of the water temperature signal detected in step 102, fuel injection pump (SAP) and valve opening regulating means (ISC) are driven in step 103. In step 104, it will wait starting of cranking. In step 105, the fuel optimal for cranking is obtained to feed a signal to the fuel injection pump. Step 105 is executed untill completion of starting combustion is detected on the basis of the engine rotation in step 106. Consequently, the structure is simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starting system applied to an automobile engine as a starter.

[Prior Art] Since the Kanrin engine requires a particularly rich d-co aiki when starting, it is generally equipped with a choke system as its starting system. However, it is essential for the choke system to include a ladder choke valve inside the carburetor, as well as a mechanical structure such as a 97-grid mechanism to open and close the lure manually or automatically. becomes. Therefore, the structure of the fuel supply system is inevitably complicated, which is an obstacle to simplifying the structure of the engine as a whole.

Patent application No. 5872376 was filed with Hikari as a starting system optical technology developed to deal with such inconveniences.
There is something that will be shown in March. That is, this one is
A fuel injection means that supplies an amount of fuel corresponding to the injection command signal to the intake system, a rotation speed detection means that detects the rotation speed of the ennon, and a detection signal from the j'l11 rotation speed detection means that operates using the detection signal as input information. and a control means for outputting an injection command signal to the fuel injection means, wherein the control means is configured to control whether the engine is at the engine rotational speed before starting or after starting. It is configured to determine whether the combustion has been completed or not, and to output the injection command signal according to a supply pattern stored in advance in relation to the cooling water temperature for each determined state of the engine.

[Problem to be solved by the invention] However, in this prior art, the closing position of the throttle valve is not controlled by distinguishing between before the engine starts and after the engine starts and complete combustion is completed, so Fine air-fuel ratio control is not possible, and when various operating conditions are considered, the supply pattern of the fuel injection ψ described above must be set to be rich. As a result, the air-fuel ratio may become too rich, resulting in a problem of poor fuel economy.

The present invention aims to solve such problems as 1=I.

[Means for Solving the Problems] In order to achieve the following objectives, the present invention, in addition to the fuel injection means, moves the closing position of the throttle valve in response to an opening/closing command signal. Valve opening adjustment means is provided, and the control means is used to determine whether the engine is before starting or after completion of starting, based on the engine speed, and for each determined state of the engine, The injection command signal is outputted according to a supply pattern stored in advance in relation to the cooling water temperature, and the injection command signal is outputted from the slot (.
The present invention is characterized in that the opening/closing command signal is configured to be output in such a manner that the opening/closing command signal is adapted to the determined engine state.

[Example code] An embodiment of the present invention will now be described with reference to the drawings.

FIG. 1 is an explanatory diagram of an engine starting system according to the present invention. This system is constructed in conjunction with the existing accelerating fuel oil increase device, and includes a carburetor for the IAAl1 automatic/F engine, numeral 2 is the fuel tank of the carburetor l, and numeral 3 is a float chamber. 4 is an injection command signal a
A fuel injection means 6 supplies an amount of fuel to the intake system 5 corresponding to the opening/closing command value b.
7 is a water temperature sensor that is a water temperature detection means that detects the engine cooling water temperature; 8 is an ignition device that is a rotation speed detection means that detects the engine rotation speed; 9 is an engine electric The ignition switch 1° is an opening detector that detects the opening of the throttle/help 2. Also, 11
The water temperature sensor 7, the ignition device 8, the ignition switch 9, and the opening detector 10
This is a microcomputer that is a control means that operates using signals c, d, e, and f as input information.

To be more specific, the fuel injection means 4 is constructed by using a torpedo-type fuel injection pump 12 attached to the carburetor 1 as a living body as a substitute element of a mechanical acceleration pump. However,
This fuel injection pump 12 houses a piston 15 in a cylinder 14 that forms a pump chamber 13.
5 lath 7' +)/g 16 and the electromagnetic attraction force of the solenoid 17, it can move forward and backward to perform the pump function. This pump 12 also communicates with the pump chamber 13 through an inlet [118 and an outlet 19].
The port 18 is connected to the float chamber 3 of the carburetor 1 via an inlet passage 22 having a check valve 21, and the outlet 19 is connected to a check valve 4 (an outlet passage having a check valve 23). 24 to the intake passage 25 of the carburetor 1
It is opened inward.

Further, the valve opening adjusting means 6 described in +fij is configured to move the locking position of the art 28 protruding from the spindle 2a of the throttle valve 2 by protruding and retracting the actuator 27 using the DCC thermomotor 26. ing.

1. The valve 13+1 degree A adjustment means 6 and the fuel injection means 4 are controlled by the microcomputer 11. The microcomputer 11 includes a central processing unit 31, a storage device 32, and interfaces 33, 34, and the interface 33 includes the water temperature sensor 7, jii.
Ignition device 8 Ignition switch 9
and the signals from the opening detector 10'4 c, d, e
, f are each manually operated. 11] The storage device 32 contains a program for increasing the amount of fuel for acceleration and a starting program.

The program for accelerating fuel increase is as follows. That is, the detected value f from the opening detector 10 is sequentially read, and the read position information of the throttle valve 2 is second-order differentiated with respect to time to calculate the acceleration of the throttle valve 2 in the opening direction. Then, by comparing the calculated value with the set value, if it is determined that the throttle valve 2 is opened at a certain amount of acceleration, then a force is applied to the fuel injection pump 12 to discharge the fuel at the first speed. Outputs the signal. Specifically, a predetermined number of pulses are applied to the solenoid 17 of the fuel injection pump 12.

First of all, the program for starting is roughly like a novice at the second tN. That is, first, step 101
If it is confirmed that the ignition switch is turned ON in step 1, in step 102, the cooling water temperature is detected based on the signal C from the oven temperature sensor 7, and the fuel supply amount and pulp are determined according to this cooling water temperature. 1!11 degrees and the storage device 32 is also pulled out. In other words, as shown in FIG.
The relationship between (SA2 times) and cooling water temperature is stored as a table, and the SA2 corresponding to the detected actual cooling water temperature is stored as a table.
The number of times is selectively extracted. In addition, the optimal throttle opening value (for example, 6 degrees) before starting is stored in the memory device 32, and this throttle opening value is extracted at this stage. - The pump 103 outputs injection command No. 117a and opening/closing command signal corresponding to the SAP I+4 number and throttle opening value in 6jj, and
) and the balloon opening adjustment means (ISC).

Then, in step 104, it was confirmed that the iiH51r machine 11-1i pulse d was input manually until the signal d (1g valve) from the ignition switch/device 68 was input to the interface 33. , the cranking process was determined to have started) Step 1 to Kohli
Move to 05. In step 105, the fuel discharge value t suitable for cranking is extracted from the memory device 32, and an injection command signal a corresponding to the value is output to the fuel injection pump (SAP) 12. That is, as shown in FIG. 4, the storage device 32 stores a table of the relationship between the optimum amount of fuel to be supplied per hour and the cooling water temperature during cranking. At this stage, the fuel injection amount corresponding to the detected actual cooling water temperature is derived. Next, in step 106, it is determined whether the engine speed detected based on the engine speed is higher than a set value N, in other words, whether the engine has completely exploded or not. In addition,
The setting ifiN is tabulated in relation to the cooling water temperature as shown in FIG. 5 and stored in the storage device 32 in 1111.

If it is determined in step 106 that the engine speed has not reached the set value N, step 105
Return to and add fuel for cranking [II' 1 9
- If it is determined that the force and engine speed have gone around the set value N once, move to step 107 L, Z;
Starts engine start complete explosion control. Control after the engine has completely exploded involves detecting the engine water temperature and reading out the fuel injection amount corresponding to the water temperature from the table shown in FIG. 6 stored in the storage device 32. Then, the injection command sheet νjia corresponding to the value is outputted to the +iii fuel injection pump 12. At the same time, the storage device 32 stores the initial opening degree of the throttle valve 2 corresponding to the cooling water temperature.
Initialize the closed IJ position of the throttle valve 2 by pulling it out from a table like the one shown in Fig. 7 stored in feedpa,
control. That is, the storage device 32 stores a table as shown in FIG. 8 showing the relationship between the correction value FI and the cooling water temperature, and the supplementary value FI corresponding to the detected cooling water temperature is determined from this table. The target number of rolls per mouth is determined. Then, the DC motor 26 of the/help opening adjustment means 6 is operated to adjust the engine rotation speed in a direction in which the engine rotation speed converges to the target rotation speed. Then, the engine cooling water temperature is detected at regular intervals, and each time the temperature is detected, the fuel injection amount and the correction value are updated to perform warm-up operation.

If the configuration is like this, the engine start rjij
The system determines whether the engine is cranking or after the engine has completed a complete combustion, and for each determined engine state, an injection command signal a is generated according to a supply pattern stored in advance in relation to the cooling water temperature.
is output. In addition, before starting and during cranking, the engine closing position is adjusted to a predetermined value (for example, 6 degrees), and after the engine has completely exploded, the idling speed is adjusted to the target rotation speed related to the cooling water temperature. For example, 55 Q
The closed position of the throttle valve 2 is automatically adjusted so as to converge to X FI rpm).

Therefore, according to the present system, the engine can be started and warmed up appropriately even if a choke system with a complicated structure is eliminated. Furthermore, in addition to controlling only the increase in fuel, the throttle opening is also controlled separately before starting and after completion of starting complete combustion. Therefore, compared to the case where only the fuel increase 1i+7 control is performed based on the supply pattern set at the tth setting j7, it is possible to perform a more fine-grained total fuel ratio control. Therefore, by setting the fuel supply pattern more strictly on the lean side, it becomes more efficient, and the fuel efficiency can be effectively improved.

In addition, although the said Example demonstrated the case where it combined with the acceleration fuel increase system, this invention is not necessarily limited to such a thing.

[Effect of the invention] Since the second invention has the configuration as shown below, the choke sinute 1 is abolished and the configuration of the intake system is improved.
'It is possible to provide an engine starting system that can be simplified, minimize the increase in the amount of fuel supplied to the intake system, and improve fuel economy. It is something.

[Brief explanation of the drawing]

;'7! im shows one embodiment of the present invention, FIG. 1 is a system explanatory diagram, FIG. 2 is a flowchart diagram, and FIGS. 3 to 8.
The figure is an explanatory diagram for explaining the contents of a table stored in the storage device of the control means. 1...Carburetor 2...@war valve 4...Fuel injection means 5...Intake system 6...Slon) Le opening adjustment means 7...B temperature detection means (water temperature sensor) 8...Rotational speed detection means (with ignition device) 9...Hiroshi Ikuuni/Inshosui/Nochi 10/a@Opening degree sensor 11...Control means (microcomputer) 12...
・Fuel injection pump

Claims (1)

[Claims] A fuel injection means for supplying an amount of fuel corresponding to the injection command signal to the intake system, a valve opening adjustment means for moving the closing position of the throttle valve according to the opening/closing command signal, and a water temperature for detecting the engine cooling ice temperature. a detection means, a rotation speed detection means for detecting the rotation speed of the engine, and operates using signals from the rotation speed detection means and the water temperature detection means as input information to issue commands to the fuel injection means and the valve opening adjustment means. An engine starting system comprising a control means for outputting a signal, wherein the control means determines whether the engine is before starting or after completion of starting, based on the engine speed. For each determined engine condition, the injection command signal is output according to a supply pattern stored in advance in relation to the cooling water temperature, and the throttle opening is adapted to the determined engine condition. An engine starting system characterized in that it is configured to output the opening/closing command signal.