JPS59192836A - Fuel injecting apparatus - Google Patents

Abstract

PURPOSE:To enable to simplify adjustment for attaching a sensor, by automatizing correction of a means for detecting the position of a member for controlling the injection quantity of fuel. CONSTITUTION:The position D0 of a control sleeve is detected by a reference data generating means 37. Deviation DELTADmax between the above position D0 and a maximum injection quantity position of the control sleeve, determined by the mechanical limitation of a governor mechanism is detected and stored in a deviation memory 39 as data DELTADmax. Correction for errors caused by the deviation in the sensor coil attaching position or by other reasons is effected by subtracting DELTADmax from data D2. Thus, it is enabled to simplify adjustment for attaching the sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fuel injection device for an internal combustion engine, and more specifically, to a fuel injection device in which a device for detecting the position of an injection amount adjusting member is self-calibrated. Regarding equipment.

In the conventional fuel injection amount control device used in electronic fuel injection devices, etc., in order to obtain a signal indicating the engine load condition from the position of the injection amount control member, for example, position detection is performed to detect the position of the control rack. equipment is provided. This type of conventional position detection device consists of a sensor coil provided on the injection pump side, and a position signal generation circuit provided on the control unit side and combined with the sensor coil).
The sensor coil and the position signal generation circuit are interconnected via a wire harness to form, for example, an oscillation circuit. The movable core provided in the sensor coil is connected to the control rack,
The inductance of the sensor coil is changed according to the amount of displacement of the control rack, and the amplitude of the oscillation output signal from the oscillation circuit is changed according to the position of the control rack.

This oscillation output signal is input to the amplitude detector and converted to a voltage signal with a level corresponding to the control rack position.
The converted signal is taken out from the position detecting device as a signal L.

Incidentally, a shielded wire is often used as a wire harness for connecting the sensor coil and the position signal generation circuit from the viewpoint of noise and noise countermeasures, but due to stray capacitance between the edges of this shielded wire, The equivalent inductance on the sensor coil side as seen from the position im signal generation circuit side changes,
Even if the positions of the control racks are the same, there is a problem in that if the type or length of the shielded wire used is different, the level of the output signal output from the position detection device will be different. Furthermore, even when shielded wires are not used as a wire harness, the level of the output signal varies by 43 degrees depending on the condition, length, etc. of the wiring. Furthermore, the injection amount is adjusted for each internal combustion engine to absorb variations in the characteristics of the engine and the injection pump, and the sensor output relative to the load changes due to the adjustment of the injection amount. As a result, if the shear wire harness is replaced for some reason, the control rack position information fed back to the fuel injection amount control device will be incorrect. I: This was an important cause of a decline in the control accuracy of the device. Therefore, in this type of value detector, not only initial adjustment but also re-adjustment is required when replacing or repairing the sensor coil, wire harness, etc. It has the disadvantage of being time consuming.

Therefore, the object of the present invention is that even if the injection amount is adjusted to absorb variations in the characteristics of the engine, injection pump, etc.,
Or, even if the tire harness or sensor coil is replaced, etc., the position detection device is automatically calibrated so that accurate ejected skin segment member position information can always be obtained without special adjustment work. The objective is to provide a fuel injection device for PI.

The configuration of the present invention includes a position sensor that outputs a position signal indicating the position of the fuel adjustment member, and a means for outputting an operating status signal indicating the operating status of the internal combustion engine, and is responsive to at least the position signal and the operating status signal. In a fuel injection device for an internal combustion engine configured to electronically control the operation of a fuel injection pump that supplies fuel to the internal combustion engine, a first means for outputting a predetermined reference signal in response to a position signal; a second means for determining whether or not the engine speed is within a predetermined speed range; a third means for comparing the position signal with a reference signal; a fourth means for obtaining a difference value between the reference signal and the position signal when the signal is larger than the reference signal and the engine speed is within the predetermined speed range; and a sixth means for correcting the position signal according to the stored contents of the fifth means, and the fuel injection device is configured to operate in response to the corrected position signal corrected by the sixth means. The point to be controlled (/l: ■Characteristics.

According to such a configuration, the difference value indicated by the fifth means is based on the fuel it1. -1 is equal to the distance the member moves from the position indicated by the reference signal to the full Q position defined by the mechanical 21i1J limit. Since this distance when adjusted correctly is known in advance, it is possible to determine how to correct the relationship between the preset position signal and the fuel adjustment member position from the stored contents of the fifth means. This operation #i can be easily expressed as
Based on the results, the position signal is corrected to provide a corrected position signal that accurately represents the actual position of the fuel adjustment member. Therefore, if the mounting position of the position sensor is shifted, or
Even if the electrical adjustment at the position sensor deviates, these deviations are automatically corrected and a signal always indicative of the actual fuel adjustment member position is obtained.

As a result, adjustments during installation of the position sensor, repair of the sensor,
There is no need to readjust the switching center, and we can expect a significant reduction in costs.

The present invention will now be described in detail with reference to the illustrated embodiments.

In the first part, an embodiment of the fuel injection device according to the present invention is shown. The fuel injection device 1 consists of a distribution type fuel injection pump 2 and a control section 4 for electronically controlling a hydraulic timer 3 of the fuel injection pump 2. Fuel is injected and supplied to each portion of the diesel engine 5 by the fuel injection bomb f2 whose timing is electronically controlled.

The fuel injection pump 2 includes a granger 7 that is driven by a diesel engine 5 and rotates and reciprocates within a granger barrel 6, and a control sleeve 9 that is fitted into the granger 7 and whose position is adjusted by a mechanical governor mechanism 8. This is a known distribution type fuel injection pump consisting of: A hydraulic timer 3 is connected to a roller holder 11 provided to cooperate with the cam disc 10 , and a solenoid valve (not shown) provided in the hydraulic timer 3
According to the electric signal from the control section 4, R1, shift 1
be done.

In order to detect the current operating conditions of the diesel engine 5, a speed signal N indicating the speed of the engine is outputted from the TDC sensor 22 at each top dead center timing of the engine. A rotational speed detector 12, a timing sensor 13 that outputs a timing signal indicating the timing at which fuel is injected into a predetermined cylinder of the diesel engine 5, and a position signal S that indicates the position of the control sleeve 9, which is a fuel head adjustment member. In order to detect the magnitude of the load on the diesel engine 4, the position detector 14 is connected to a sensor coil 15 whose inductance changes according to the position of the control sleeve 9. The level of the position signal S changes according to the position of the control sleeve 9.The speed signal N and the position signal 5ll-11 are converted into digital signals by analog-to-digital converters (A/D) 16 and 17, respectively. is input to the interface circuit 18 as data DlpD2.Interface IIfflf
The pulse train signal TDC and the timing pulse P are also input to M18, and the data DI*D2,
The t4 pulse train signal TDC and the timing pulse P are:
The optimal injection timing according to the operating conditions at the time is calculated according to the control program inputted to the central processing unit # (CPU) 19 via the interface Im'7818 and stored in the memory 20. In order to obtain the injection timing according to this calculation result, control data D3 for operating the hydraulic timer 3 fftK is output from the CPU 19, and the drive circuit 21 adjusts the timing in the hydraulic timer 3 according to this control data D3. The injection timing is controlled electronically by opening and closing a solenoid valve (not shown).

FIG. 2 shows a functional diagram of the control section 4 shown in FIG. 1.・Mother pulse train signal TDC,! : Timing cruise P is input to the actual timing calculating means 31, and actual timing data D4 indicating the actual injection timing is output. On the other hand, the data D2 indicating the position of the control sleeve 9 is sent to the target timing calculation means 33 to which the bale corrected by the correction means 32 and the data D1 indicating the engine speed are input. Based on both data D r r D 2', the optimum injection timing matching the engine operating conditions at the time is calculated, and the calculation result is output as target timing data D5.

The actual timing data D4 and the target timing data Ds are input to the error calculation means 34, and the difference between the actual timing and the target timing is calculated based on both data, and the error data D6 indicating the calculation result is sent to the PID control means. 35
After being input into and processing for PID control,
It is output as j#U control data D3.

A block 36 surrounded by a dotted line is for obtaining correction data for automatically correcting the position data D2, and is used for generating reference data to output reference data Do corresponding to a predetermined control sleeve position. means 37 and data D2.

and a difference calculating means 38 for calculating the entire difference between the two.

Here, the value of the reference data Do is such that even if variations in the mounting position of the sensor coil 15 and/or variations in the characteristics of the position detector 14 are considered, the sleeve position: 6 is always indicated by this data D. The value is set to exceed the order 11'χ. Reference numeral 40 indicates engine speed V
It is a continuous ship discrimination means for checking whether or not the speed is within a predetermined speed range v1≦V≦V2 in response to the data D. Only in certain cases, the prohibition 71.11 removal signal Δ·■ is output to the difference calculation means 38, and the difference calculation means 38 is put into operation.

The difference calculation means 38 is a means for outputting data ΔD indicating i membership only in the case of D2>Do, and the data ΔD is input to the difference memory 39. trench memory 3
9 compares the new input data ΔD and the already memorized data ΔD', erases the data ΔD' only when the new data ΔD is larger than the already memorized data ΔD', and deletes the data ΔD'. It is a memory means for storing the data ΔD. Therefore, if the rotational speed V of the first motor is within a predetermined range, and the position (the extractor 14
The position of the control sleeve 9 detected by
Basic pregnancy data Do output by the standard data generation means
The difference is Δ1) or IP1 force 0, Δ1, which indicates the difference in the direction of fuel increase, as shown by 1;
) is the maximum ()1 (ΔDmax is the differential memory 39 & this store).

By the way, controlless leaf 9's rush f-'
The i rotation 13 [+4" of l" Ic, J-, is sufficient, control sleeve 9 is □) 8 usual turning A 1) 2
The work VC is v21, relatively short I (・I decided to remove the maximum VC within 2 days, and Conotrol Three 79
49'; (feature) in the stomach direction] ゛(・su big crying liI: with data showing) 11. Good data ■). Is the data showing the suspension with the ratio) P, ・Accurate knowledge: I, 1: 11ii, 7
Store L minutes in memory 39 as data ΔDnax.
It's time to do it.

A little bit more than 4 (Full data). The control sleeve position indicated by; 3-large and the cabana machine eyebrows, 5) and 1.・
The illumination of the control sleeve that is satisfied by the mysterious wandering eyes
L'I! Hayashi, Pi maximum 1'l'/-it: 1 means 1 in advance.
1] I'm here. Data ΔDmax
From the 11th day of the month, the sensor coil 15's Il is also around January 11th ~
1-Nozun Others (7) )4. ! Evil: Mulberry/
rj's:! ui stop gaya easy [can be done easily. This fli positive is from Naruti, iF Judan '32 VC,
This is done by subtracting ΔI) max q) at d gv2+.

Figure 3 shows the functions shown in Figure 2 and Figure 1.
To do 3 lines, 'di! A flowchart of the control program 11 stored in the memory 20 of the I-supra section 4 is shown. This program is executed at 'i' in response to an on operation of an ignition switch (not shown).
r′+, and in step a, each variable βold
, βnew, and Lo are set. variable βo
ld, βnewl'tO, and Lo is data D corresponding to a predetermined standard of the control sleeve 9.

is set to Next, on Stella fb, Houma 4
(The data DI indicating the position of the control sleeve and the data D2 indicating the control sleeve position at that time are read,
A big and small battle is held (Sutetsuno C). D2≦Lo
If so, proceed to step d and calculate D2'-D2-βn
The data D2 is corrected by calculating eXv. In this case, βnew = 0, so 1 clear station D2' = D2, and timing: 1 for D2.
ill (ill will be executed (Stella'7
'e).

If the control result for the stenoa 'c is YES, the process proceeds to steps f and g, where it is determined whether or not the engine speed V is between predetermined engine speeds V, , V2 (>V,). It will be done. If v1≦V≦v2, proceed to step h and take D2. The difference β is calculated, and βol is added to this value β.
The value added to d f is set to βnew (step,
J.). Thereafter, the content of βold is set to βnew (step k), and the content of data Lo is set to D2 (step k). Next, step d is executed, and the contents of data D2 are βne w I/
CJ413. Corrected accordingly. Using this JS corrected data D2''ffz, the timing is 1tll.
l, ijl are executed, and the process returns to step b again.

According to such a configuration, if the value is within a predetermined range, the installation error of the sensor coil is automatically corrected, so there is no need to spend time and effort on adjusting the installation of the sensor coil 15.
It has the advantage that no adjustment is required even when the wire harness between the sensor coil 15 and the detector 14 is crossed. Furthermore, the automatic correction function as mentioned above is added to i+.
If you keep this in mind, you can also correct the temperature characteristics of the sensor coil and other circuits, making it even easier! ! High control of L can be easily achieved.

In the above embodiment, a fuel injection device using a distribution type fuel injection pump is shown as an example, but it is of course possible to similarly apply the present invention to other early-acting fuel injection pumps. Furthermore, the fuel injection timing is not limited to 1iflJ control, but can be controlled by other HjlJ controls, such as injection h1 and
Even in the case of control, the same excellent effects can be obtained by applying the present invention in its entirety.

According to the present invention, as described above, the device for detecting the positions fM and l of the injection -K"r This eliminates the need for round-trip adjustment during maintenance and inspection, and can be expected to significantly reduce costs.Furthermore, the temperature characteristics of the sensor and each circuit can be corrected, so 1till?
ll1l i, '(' is a very distorted sound effect!/I feel it.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a functional diagram showing the functions of the control section of the device shown in Fig. 1, and Fig. 3 is the function of Fig. 2. 2 is a flowchart of a ::i control program for accomplishing the functions shown in the block diagram. 1... Fuel injection device, 2... Fuel injection pump,
3... Hydraulic timer, 4... 1ilj control, 5...
・Diesel engine, 8... Mechanical governor, 9...
・Control sleeve, 12...rotation speed detector,
13... timing sensor, 14... position detector,
15... Sensor coil, 19... Central processing unit, 3
1... Actual timing calculation means, 32... Correction means,
33...Target timing calculation means, Do...Reference data, D2'...Correction position data.

Claims (1)

[Claims] 1. A position sensor that outputs a position signal indicating the position of the fuel adjustment member, and means for outputting an operating status signal indicating the operating status of the internal combustion engine, the sensor being responsive to at least the position signal and the operating status signal. In a fuel injection device configured such that operation is electronically controlled, first means for outputting a predetermined reference signal in response to the position signal; and whether or not the speed of the internal combustion engine is within a predetermined speed range. a third means for comparing the position signal with the reference signal; and a third means for comparing the position signal with the reference signal; fourth means for inverting a difference value between the reference signal and the position signal when the speed is within the predetermined speed range;
fifth means for storing the maximum value of the difference values obtained by the means; and means for correcting the position signal according to the stored contents of the fifth means to obtain a corrected position signal, A fuel injection device characterized in that operation control is performed in response to.