JPS5965524A - Fuel injection amount controlling apparatus for diesel engine - Google Patents

Abstract

PURPOSE:To permit fuel injection amount control which is not influenced by the secular change by correcting the output of a position detector of a fuel control member on the basis of the deviation between the output of an O2 concentration detector for detecting O2 concentration in exhaust gas and O2 concentration estimated in operation state. CONSTITUTION:In operation a controller 1 obtains an aimed injection amount on the bais of each output of a revolution-number sensor 5 and an acceleration sensor 6, and an aimed rack position is obtained from said aimed injection amount and the number of revolutions of a pump. Then an actuator 3 for driving a control rack is controlled so that the actual rack position detected by a rack position sensor 4 is accorded with the aimed rack position. The O2 concentration is estimated from the above-described aimed injection amount and the output of the acceleration sensor 6, and the output of the rack position sensor 4 is corrected in the direction for correcting the deviation between the above- described estimation value and the output of a lean sensor 2 for detecting the O2 concentration, and thus the characteristic error of the position sensor 4 is corrected.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for controlling the engine during engine operation in the 4'1 injection controll L position for the opening of a teasel machine.
A1'' device detector (
11. Automatically correct the error of Sen-II). , lr characteristics.

Conte L + - Luranokui standing center on B2 l; l: !
It is difficult to make something with all the characteristics. Therefore, after installing 1', fixed resistance, etc. in the control device and determining the combination of 1' and the control device,
(The control device was not compatible with the control device due to resistance, etc.) Therefore, the control device and the 1! child.

1-The invention is based on the above mentioned 'FLl! By automatically correcting errors in sensor characteristics, the process of compatibility between the position sensor and the control device can be improved, and at the same time, the matching between the position sensor and the control device can be improved.
Ensure the acute
The purpose is to be able to respond to requests (1).

, achieved the second objective 4? ), the present invention provides an rj2 elemental concentration detector that detects the actual degree of coverage of nitrogen in the tit gas, and compares the actual oxygen concentration with the target injection amount and the oxygen concentration estimated by the air intake. Depending on the deviation from the position, the amount by which the detection signal of moxibustion output 2:( is corrected is changed, or the stored value is changed so as not to indicate the 11 target injection desire.

Hereinafter, the present invention will be explained with reference to examples shown in pl.

FIG. 11 is a system diagram of the 11th a L;r def-cell engine. 1 (controlling by I injection m and Tee cell engine rotation speed, etc. → Microphone ++: A control device equipped with 1 amp, -ri, etc., 2 is a control wave W 1 '', tn air of the Tee cell engine 3 is a lean sensor that measures and knows the oxygen 7.54 [(02 concentration); 21 + - Luranok as a fuel adjustment member 9"
j'kuchi: L-1: - Evening, 4 is: +n1 and 1- is the rack position sensor that detects the position of the luranok and informs the control device 1. 5 is half the speed of the diesel engine crankshaft. Rotate. G is an accelerator sensor that detects the amount of operation of the accelerator pedal and notifies it to the control device 1. Further, 71 is a diesel engine, 72 is a fuel injection pump, and 73 is an exhaust pipe.

FIG. 2 is a block diagram of the fuel injection amount control system, and everything from the control device 1 to the accelerator 6 is the same as in FIG. 1.

Fig. 3 Beam near solenoid type actuator 3,
7 is a cross-sectional view showing how an inductance-type rack position sensor 4 and rotation speed sensor 5 are attached to an injection pump 72. FIG. Actuator 3. 31 is a coil, 32 is 1
It is accompanied by "C" - Higgani 1° no', 81
821 is the control of the injection pump 72, 821 is the shaft of the pump 72, 83 is the shaft of the pump 82 (-J tJ is the detection coil, and 41 is the control of the injection pump 72. Rack position sensor 4I4 coil, 421t
The core is made of Socholite. Actuator 31
J: : + When current is passed through 31), - Hingo J Ako 2 is attracted. : 1 N 1 "1- Do not move Luranok 81. Rack position sensor ゛ 4 !; i m
The core 42 moves in accordance with the movement of the lun II + - lurranok 81, and the inductance of the lil 41 changes accordingly, which is used as 1q to detect the position of the ln II + - lurranok 81. Rotation number senri・5 is float 8; 3 is rotation 1・1
J'J' comes out from the magnet in the rotation speed sensor 5 and passes through the detection coil 84 in the rotation speed sensor 5 (it Elj
Voltage is generated in the coil 84 due to the change of the instep Σ
Jf is used to detect the rotation speed.

The fourth, fifth, and 6171st are +l of the lean sensor 2 mentioned above.
An example of monosexuality is shown. The relationship between the voltage and the electric current At when the first 114'JJ is 027:τ degrees is shown. Lean sensor at this time 2) cM! □ Degrees 'J: Al at 750'C. 41st ffl For each o2a degree, the applied voltage O,
The voltage-current characteristics near OV are flat. The current value at this time is II+,! It is called field current. 512I
is a diagram showing the limiting current for each 02 concentration O, ]:O air-fuel ratio (A/F). Figure 6 is each 02? The limiting current corresponding to f1 degree is Lean 1! The extent to which it is affected by the concentration of 11g1 is 11g1.

Next, the operation of the control device l is controlled as shown in FIGS. 7 and 8.
This will be explained using Jar 1. When the power is turned on to the control device I, the first 1 of the micro combi coater Ill 101
The process starts from the step of converting into υj. Initialization 101 includes rack position correction 1, which converts the output of the rack position sensor into the rack position itself. ? Set the + number etc. to the initial value. In the step 102 of capturing the rotational speed, etc., the engine rotational speed is determined from the signal from the rotational speed sensor 5, and the accelerator operation amount is determined from the signal from the accelerator sensor 6.

In step 103, target injection ■ε1rl, the target injection amount is determined from the engine rotation speed and the accelerator 1 operation amount by map or δ1 calculation. At the target rack position output step 104, the target injection amount and engine rotation are 1', which is 1! A target rack position is determined from the pump rotation speed, and a rack drive signal corresponding to this target rack position is output.

The controller 1 contains a rack drive signal and a hook position sensor 4.
There is a lean sensor that generates a signal to drive the actuator 3 from the signal 4. This servo pump (which converts the knock position signal recognized from the output of the rack position f! sensor 4 into the rack drive signal) is actuated by the actuator 3.
If the rack position sensor 4 goes out of order, the 1-1 mark book position and the actual control r + - Luranok position will be different, and the target injection amount and actual injection amount will be different. It shifts. In step 105 of the rank position correction meter lT, the lean sensor is used to find the actual injection amount, and the rack position correction coefficient is changed from the injection amounts of 1 and 2, and -C target injection amount δ1 is calculated 103. The injection amount determined by the target injection 1・IM and Lean Senna 2 is 11゛”-
Make it yo・). How much is this rack? The lli positive coefficient is used to generate a rack drive signal from the target rack position determined by the target rack position output 104.

FIG. 8 is flowchart 1 in which the portion of the rack position correction meter y ¥105 is shown in revision 3. In step III, the intake air amount calculation step, the engine air intake (■) is determined by taking into account the air intake efficiency from the engine rotational speed. In step 112 of 02 concentration δtW, the target injection amount is calculated by calculating the supply air amount ffl@tW111 and the target injection amount δ102b
The degree of success is determined by 11, and the agricultural degree is obtained from the prediction (2).In the step of calculating the lean sensor output prediction in 113, the responsiveness of the lean sensor is calculated from the predicted 02 concentration obtained in 112. J lπ to obtain the lean sensor output predicted value. In the step 114 of inputting the 02 concentration, the signal from the lean sensor 2 is read. In the step of updating the correction coefficient of 115, the lean sensor output predicted value bar1 calculation 113
The rack position correction coefficient is updated so as to correct the deviation between the lean sensor output predicted value obtained in 2114 and the lean sensor output obtained in 02 concentration 2114.

In addition to the above programs, the control device 1 also processes interrupts generated by signals from the rotational speed sensor 5. By this interrupt processing, the rotating circle November is set to :F.

In addition to Example 1, rack position correction 81 calculation 10 in Fig. 7
5 can also be configured as shown in FIG. This example is the same as FIG. 8 except for the step 121 for determining stability, and the temperature is °C. Stability judgment 12Ir is 0 concentration iI! 3! : 112 The range of variation in the predicted 02 concentration determined by -.Checks whether or not the function whose concentration is below the fixed value has been in conflict for a certain period of time, and if it continues, the rack position correction δ1 calculation 105 is finished and the number of rotations etc. are taken in 102・＼Advance, conversely, if 1 or more continues for a certain period of time, 02′
Proceed to a degree human power 114.

When i & ff, the lean sensor output predicted value used in the correction coefficient update 115 is changed to the fluctuation i used in the stability judgment 121.
(O2 concentration old)
￥ I It can be calculated using the latest value of predicted 02# degree obtained in 12 or the average of a certain number of data taken from the latest one, or it can be calculated using the same method as the predicted lean sensor output value 1 calculation 113 in Figure 8. I can do that.

In the above two embodiments, L] is determined from the target injection amount and pump rotation speed in the target rack position output 104 in FIG.
Two-dimensional map interpolation is conveniently used to find the target position.

In addition, in the above two embodiments, the rack position 711 positive coefficient was updated from the injection amount obtained using the 11-mark injection instep and the lean sensor, but the target rank position is determined without using the rack position correction coefficient. Rack position I can also be determined by updating the 2D map! This method can also deal with changes in the characteristics of the engine.Furthermore, this method can also deal with changes in injection determined from the number of lamps and the position of the control rack.

Furthermore, a valve is provided between the exhaust pipe 73 and the lean sensor 2, so that 0. ! By measuring δM Lα, IIL and response delay of the lean sensor 2 can be ignored. At this time, the amount of non-uniformity of the injection pump for each cylinder can also be measured.

Also, the fuel injection amount control system lJ-example shown in FIG.
On the diesel engine side, which rotates at a constant speed, the accelerator sensor can be removed, and the intake sensor? A! It is also possible to perform control by adding 07 values such as intake pressure, fuel temperature, cooling water temperature, exhaust pressure, IJf temperature, etc.

In addition, in the above example (if the J lean sensor fails, the injection amount may become too large or too small, and if the correction amount becomes less than a certain value, it is determined that the lean sensor is abnormal). Then, the amount of correction may be eliminated.

Further, the present invention may be applied to a distribution type fuel injection pump having a spill ring.

As described above, the present invention changes the amount by which the detection signal of the position detector is corrected in the direction of correcting the deviation between the actual oxygen concentration and the estimated oxygen concentration, or the stored value representing the target injection amount. Since we are changing the position v1tL output device and i
It is possible to omit the adaptation process with the control device, and at the same time ensure compatibility with the position sensor, and furthermore, it is possible to cope with changes in the sensor over time.

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram showing one embodiment of the present invention, Fig. 2 is a block diagram of the fuel injection pseudo control system shown in Fig. 1, and Fig. 3 is an installation state of the actuator and sensor shown in Fig. 1. (Fig. 4, Fig. 5, and Fig. 6 are characteristic diagrams of the lean sensor, and Fig. 7 does not show the processing procedure in the control device in Fig. 1.) Figures 9 and 9 are respectively n't♀1■
Full:+-'f-yar1-. DESCRIPTION OF SYMBOLS 1...Control device, 2...Lean sensor, 3...Akubu 1eta, 4...Rack position sensor, 5...
Rotation speed sensor, 6...Accelerator sensor, 71...D-1! engine, 72...injection pump, 73...exhaust pipe, 81...21 controller ranok. Representative Patent Attorney Takashi Okabe Figure 3 Figure 4 &ptJDIe/'c (V)

Claims (1)

[Scope of Claims] (]) Diesel 1 Ikurukawa fuel j'mi 1 injection fl = 1 fuel 1'' of the pump, 1 position of the gate joint fin (j), l (detected by a detector, and this detection Diesel engine fuel 1'- which returns and controls the furnace +1'1 injection to the target value according to the slope 5yB
This is a 1-injection n/1ri control device, which includes an oxygen concentration stage -■ stage that detects the oxygen concentration at the edge of the IJI gas, and a target injection level 1. .1.l,i
The oxygen concentration is set to 111 in accordance with the supply air of the engine, and this 111. between planting and the actual oxygen concentration ((
A control means for changing the speed at which the detection signal of the position detector described in 1111 is corrected is provided to correct the error of the ( )γ position detector in tl. (Diesel with 11+r characteristics) 9, opening fuel injection amount control device. (2) Detect the position of ljA II+ injection pump fuel o 1 adjustment part) 1 for diesel engines with the 11) - position detector, and adjust the fuel;1'1 injection p to the target value according to this detection signal. Fuel injection Wl-1 for the tea cell engine that is feedback-controlled to
i' Control device - C1 Oxygen concentration detection means that detects the actual oxygen concentration in the exhaust gas, and l-14ffi ll+'i determined by the engine operating conditions! In accordance with the I/I amount and the air supply amount of the engine, 0; The target pC1
niI, 41.
'1. '/r, to compensate for the characteristic error of the detector.'
1-injection 1-I control device.