JPS62111136A - Controller for variable cylinder engine - Google Patents

Abstract

PURPOSE:To improve the durability of an engine by alternately changing an operation cylinder and a repose cylinder, thus uniformalizing the abrasion of each cylinder, in the partial cylinder operation of a cylinder quantity controlled engine. CONSTITUTION:Fuel is supplied into the first-third cylinders 61-63 and the fourth-sixth cylinders 64-66 of an engine 1 from fuel injection pumps 7 and 8. Two solenoid valves 12 and 13 are installed between the fuel feeding pumps 10 and 11 connected to a fuel tank 9 and the fuel injection pumps 7 and 8, and controlled by the signal supplied from a controller 14 through timers 15 and 16. The controller 14 operates the cylinder groups 61-63 and 64-66 alternately by inputting a signal from a torque detector 5 and sending signals into the timers 15 and 16 alternately when the torque is below a prescribed value. Therefore, even in case of the partial cylinder operation, each cylinder can be operated with a uniform rate, and the durability of the engine can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a control device for a variable cylinder engine mounted on an automobile or construction machine.

As shown in the prior art publication No. 60-23480, a variable cylinder engine is known that performs partial cylinder operation by suspending the operation of some cylinders when the engine is lightly loaded. Not only can consumption be reduced, but engine operating noise can also be suppressed.

Problems to be Solved by the Invention In such a variable cylinder engine, since the partial cylinders that are inactive during light engine load are always the same, the cylinders that are activated during partial cylinder operation are always the same, which poses a problem in terms of durability. There is.

Means for solving the problem; means for detecting an active engine load; and means for operating all cylinders when the detected load is above a set value, and operating some cylinders when the detected load is below the set value; The system is constituted by a means for changing the cylinders that are inactive and the cylinders that are in operation when the partial cylinders are operated, so that the cylinders that are inactive during the partial cylinder operation can be changed.

The output of the embodiment engine 1 is the output of the clutch 2. The signal FK is transmitted to the running wheels via the continuous shooting 3, output shaft 4, etc., and the output shaft 4 is provided with a torque detector 5 for detecting the output shaft torque, that is, the engine load.

The engine 1 is provided with first to W16 cylinders 61 to 6-, and fuel is injected to the first to third cylinders 6I to 61 by a wc1 fuel injection pump, and the W, fourth to sixth cylinders 6
4 to 6g, fuel is injected by the second fuel injection pump 6,
The fuel in the fuel tank 9 is supplied to the inlet lower α, 8α of the eleventh and second fuel injection pumps 7.8 through the first and second pumps 10.11 and the first and second solenoid valves 12°13′t-. , fuel is injected into the first to sixth cylinders 61 to 6 at predetermined timing.

The first and second' magnetic valves 12 and 13 are controlled by a controller 14.
The controller 14 operates to open and close the torque detector 5 by signals sent through the first and second timers 15 and 16.
A signal is output based on the detected torque.

For example, as shown in FIG. 2, the detected torque 2 is converted into a digital signal by the AD converter 17 and inputted to the comparator 19 together with the reference value α from the reference value setter 18, and the detected torque (s:> When 5, a signal is output to the first and second OR gates 20 and 21, and when the detected torque
A clock signal is output to the K terminal, the Q terminal is connected to the @l OR gate 20, the Q terminal is connected to the second OR gate 21, and a signal is output from the first OR gate 20 to the first timer 15. , the second OR gate 21 outputs a signal to the second timer 16.

The first and second timers 15 and 16 are connected to the controller 14.
When more signals are being input, the first and second solenoid valves 12
．． 13 is opened, and if there is no input, the first and second
Solenoid valve 12.13t - closes, closes after a certain period of time after no signal is input, and immediately opens when a signal is input.

However, during normal driving or pitching driving, the output shaft torque becomes large and the detected torque X exceeds the set value α, so the first
, the second OR gate) 20.21, and the signal is not input to the a1 terminal of the T flip frog 22, and the first and second OR gates 20.21
A signal is input to the timers 15 and 16 and the first. @2 Solenoid valves 12 and 13 are opened, and the first and second fuel injection pumps 7
．． 8, fuel is supplied to the first to sixth cylinders 61 to 66, resulting in all-cylinder operation.

When waiting for a signal, waiting for a train to pass, or exiting the train, the output shaft torque becomes small and the detected torque 77 A signal is input to the CLK terminal of the flip-flop 22, and the outputs of the Q and Q terminals of the T-flip-flop 22 change to the opposite state to the state before the signal was input.

For example, the Q terminal outputs a signal before a signal is input,
If the Q terminal is not outputting a signal, the Q terminal will no longer output a signal, and the Q terminal will output a signal, so the signal will be output to the second OR gate 21 and the signal will continue to be output to the second timer 16. is%I! l The signal is no longer output to the timer 15, the first solenoid valve 12 is closed, and the second solenoid valve 12 is closed.
Fuel is injected from the fuel injection pump g into the fourth to sixth cylinders No. 6 to 6m, resulting in partial cylinder operation.

Then, when normal driving resumes and the detected torque X exceeds the set value 6, a signal is output from the comparator 19 to the 11th and 2nd OR game) 20.21 in the same way as described above! +, the second solenoid valves 12 and 13 are opened, resulting in all-cylinder operation. At this time, the signals at the Q and Q terminals of the T free lag flop 22 do not change and the previous state is maintained.

After that, when waiting for a signal or waiting for a train to pass, and the detected torque Therefore, the Q terminal outputs a signal, the q terminal no longer outputs a signal, the first OR gate 20 continues to output a signal, and the second OR gate 21
Since the signal is no longer output, the second solenoid valve 13 is closed, and the first to third cylinders 61 are
Fuel is injected from 61 to 61, resulting in partial cylinder operation.

In this way, each time the partial cylinder operation is started, the cylinders to be deactivated alternate between the first to third cylinders 61 to 6a and the fourth to sixth cylinders 64 to 66, so only a certain number of cylinders can be deactivated as in the past. Since the piston rings, etc. of all cylinders wear in the same way, the gap due to wear between the cylinder and piston is uniform and almost constant, which can suppress the decrease in engine efficiency and improve durability. It is preferable in terms of.

Please be careful, 1st and 2nd timer 15. J6 does not close the first and second electromagnetic valves 12, 13 until a certain period of time has elapsed since the signal was no longer input, so it continues to operate at full load during that time. Fortunately, when the engine does not start because it is waiting for a signal or a train to pass for a short period of time, it can immediately shift from an idle state to full rotation speed without compromising acceleration performance.

FIG. 3 shows another embodiment, in which the first,
Second hydraulic pump P1. 8, and the discharge pressure oil is
, the second operation valve 30.31 supplies the first and second work equipment actuators 32.33, and the discharge passages 34.35 of the first and second pumps Pt, Pg.
is connected to the pressure sensor 37 via the shuttle valve 36 to detect the high-pressure second pressure oil, and the detected value of the pressure sensor 37 is input to the controller 14, and the first and second electromagnetic Open and close valves 12 and 13. That is, if the work is temporarily interrupted or stopped with the full operation valve for the work equipment actuator in the neutral state, the oil pressure in the discharge passage 34, 35 will decrease and become below the set value α, so as in the first embodiment described above, Perform partial cylinder operation.

On the other hand, when any one of the operation valves is operated, the discharge passage 34.
35 is detected as a high pressure via the upper shuttle valve 36, and a signal is input to the controller 14. The critical 1 and 2 timers 15 and 16 are used to prevent acceleration when the engine speed drops and then returns to the set speed when starting work after temporarily suspending work. It is provided to continue operation of all cylinders for a certain period of time even when all operating valves are in neutral, and outputs a signal to the excitation part of the first and second solenoid valves 12 and 13 for a certain period of time. It is.

Effects of the Invention Since the cylinders that are inactive and the cylinders that are activated can be alternately changed during partial cylinder operation, the piston rings of each cylinder wear out uniformly, and the gap between the piston and cylinder due to wear and tear is reduced in each cylinder. This makes it possible to suppress the deterioration in engine efficiency caused by this, and also to improve durability.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and Fig. 1 is an overall view, Fig. 2 is an explanatory view of the controller, and Fig. W2B is an overall view of the second embodiment.

Claims (1)

[Claims] means for detecting engine load; means for operating all cylinders when the detected load is above a set value; and means for operating some cylinders when the detected load is below the set value; and stopping when the some cylinders are to be operated. 1. A control device for a variable cylinder engine, characterized in that the control device comprises means for changing a cylinder to be operated and a cylinder to be operated in exchange.