JPS59185849A - Control back-up apparatus of electronic controlled 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 The present invention relates to a control backup device for improving the reliability of an electronically controlled internal combustion engine in an emergency.

Electronically controlled internal combustion engines are intended to be realized by using an all-electronic computer to control the optimum operation of a diesel engine, for example, by controlling the engine's crank angle, rotational speed, torque, and pressure in each part of the engine. , detects force, temperature, composition of exhaust gas, etc., and processes these operating data with a computer according to a predetermined GLODARAM to determine optimal operating control conditions.These determined conditions are used as control command information. The starter valve, intake valve, exhaust valve, fuel injection valve, etc. of the diesel engine are opened and closed according to the crank angle.

FIG. 1 shows the overall configuration of this electronically controlled internal combustion engine. A diesel engine usually has a plurality of first to Nth cylinders (1)? Each cylinder (1) has a starting valve (2), an air supply valve (3), and an exhaust valve (4).
, a fuel injection valve (5) is equipped. (6)-(9)
This is an actuator that operates all of the parts (2) to (5). Fuel oil is supplied to the fuel injection valve (5) from a fuel tank αO by a fuel pump (11). Q2
1 is a fuel pressure accumulator, (13) is a fuel cutoff valve, and Q4) is a check valve.

On the other hand, the rotation angle of the crankshaft (15) is determined by the encoder Qe.
) detected by n, input port θη and data bus (
18) and then the central processing liquid 7 (hereinafter referred to as CPU)
(19) is input. The detection output of the encoder θ is also sent as crank angle information to the Diesel/1/engine control circuit and the frequency/voltage converter e21). The signal converted into a voltage signal according to the rotation speed by the frequency/voltage converter CD is sent to the analog/digital converter (c).
is input to the CPU θ9) via the data bus Ql'. In addition, the pressure, temperature, exhaust gas composition, etc. of each part of the Diesel IV engine are detected by sensors (S□) to (S6), and the data is converted to digital/L/L/L by the analog/digital converter (c). After being discarded, the CPU (+
9).

The CPU (1) reads the operation command input from the setting input/display device (C), and based on this operation command, inputs the crank angle and rotation speed from the analog/digital converter (A), etc. Using data representing the entire operating state of the engine, such as the pressure and temperature of each part of the engine and the composition of exhaust gas, calculations of control variables and manipulated variables for optimal control of the engine are executed according to a predetermined program. Then, from this calculation result, all control commands for the fuel pump (11) are created and the fuel pump (Ill'77) is controlled via the digital I/analog converter (c).Furthermore, the CPU Q9 uses the calculation result Start valve (2), air supply valve (3), exhaust valve (4)
), creates control commands for each part of the fuel injection valve (5) and outputs them to the Diesel A/engine control circuit (1).

The diesel engine control circuit reads the control command from cPU ([9) and transmits control information corresponding to the crank angle information obtained from the encoder 0 to the first and second drive circuits (c). Send it to (E). The first drive circuit (c) controls a control valve @ that controls the actuation timing of the actuator (9) to operate the fuel injection valve (5).

The second drive circuit (E) is an actuator (6+ m (
8) Control valves (c) that control the operation timing of each
(a) By controlling (7), the starting valve (2), the air supply valve (3),
It operates the exhaust valve (4) and controls the operation of the fuel cutoff valve. In addition, the hydraulic pressure generated by the hydraulic pump 01) is used as the power source for driving the 7 actuators f6) to (9).
) is interposed on the outlet side of ) to prevent pulsation. (to) is the pressure regulating valve, ■ is the oil tank, and (to) is the flow rate control valve.

However, such an electronically controlled internal combustion engine has the disadvantage that if a failure occurs in the electronic computer unit for some reason, the operation of the internal combustion engine must be interrupted until maintenance work is completed.

An object of the present invention is to provide a control backup device that allows engine operation to continue even when a computer failure occurs and measures are taken to restore normal operation.

The control backup device for an electronically controlled internal combustion engine of the present invention detects the crank angle of the internal combustion engine, calculates the opening/closing timing of the valve that needs to be opened and closed during operation, and controls the valve drive actuator based on the calculation result. In an electronically controlled internal combustion engine that switches the direction of fluid flowing through the engine and controls the opening and closing operations of the valve, the internal combustion engine is connected and driven to the crankshaft of the internal combustion engine, and the opening and closing timing of the valve is recorded in advance in correspondence with the rotation angle. A recording body, a first control valve that reads valve opening timing and valve closing timing from the recording body and switches the direction of fluid leading to the actuator, and a fluid flow path to the actuator whose direction of fluid is determined based on the calculation result. and a second control valve that switches from the electronic control fluid flow path side to the backup fluid flow path side in which the first control valve is interposed, and when a failure occurs in the computer system. The system is characterized in that the switching circuit is switched and the entire operation is continued using backup data from the recording medium.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 and 3. In addition, the same reference numerals are given to the parts that have the same effect as in Fig. 1, and their explanations are given below. Omit. In addition, in the following explanation, the actuator (9) for driving the fuel injection valve among the actuators (6) to (9) of the Nth cylinder is:
This will be explained as a representative example.

(To) is a center bypass type directional valve as a control valve that is switched by the first drive circuit (C);
At the neutral position R(a), the cylinder boat of the actuator (9) is closed and the hydraulic pump I3D side is unloaded. @(To) is the first and second directional control valves interposed between the cylinder boat of the directional control valve (To) and the actuator (9), which are both open as shown in Figure 2 when the engine is normal. I'm n. (To) is the main directional control valve that is installed on the outlet side of the pressure accumulator to select the flow path. (G) is the electronically controlled flow with a center bypass type directional control valve (To) The third directional control valve, 0]) (6), which is installed in the backup flow path (C), which is different from the path (B), is the fourth directional control valve, which is installed in the backup flow path (C). The fifth directional control valve is closed as shown in FIG. 2 when the engine is normal. In addition,
The drive format of each of the above parts is as follows. 2nd and 4th. 5th directional control valve @ (to) (6) and main directional control valve)
is a spring return type solenoid valve, the center bypass type directional control valve (7) is a double solenoid type solenoid valve, and the eighth directional control valve IF) is a mechanical type.

FIG. 3 shows the configuration of a cam that drives the third directional control valve (to). The wheel is a gear mechanism that connects the engine's crankshaft 051 and the rotating shaft.
It is driven in synchronization with the season. (451) (45,)...
-(45N) is a cam group for the 1st, 2nd,...Nth cylinder installed coaxially on the rotating shaft, each cam group (45t) (4511) -(45N) ) is the starting valve opening/closing timing memory cam@wheel, the intake valve opening/closing timing memory cam θη, the exhaust valve opening/closing timing memory cam (c), and the fuel injection valve opening/closing timing memory cam■. Each cam group (45□) (45,)...(45N) stores the opening/closing timing of each cylinder's valve in its cam shape. The eighth direction valve θQ is switched according to the original state of the cams of the Nth cylinder cam group (45N). In addition, cam θe (η (Found)) of cam group (45N) and other cam groups (451) (
45-... (45N t) is similarly provided with a directional control valve for reading n and reading p.

In addition, the above-mentioned No. 1. 2nd and 4th. Fifth directional control valve @
(G) 0 (6) and the main directional switching valve) are driven by a backup signal device (G). The backup signal device is an output signal of the manual operation switch υ or an abnormality detection signal from the lift detection sensor side of the actuator (9) (5), which switches the energization of each solenoid valve from off to on. (Foundation) is a timer circuit with a specified time T, and when the engine is normal, the rise detection signal of the actuator (9) of the lift 1-detection sensor is used to reset the specified time [J, -D, When the timer circuit (incorporated) detects that the specified time has elapsed, this output becomes the abnormality detection signal (6k).

Because of this structure, when the engine is operating normally and the operation is controlled by the first drive circuit, the hydraulic fluid flows to the actuator (9) as follows.

First, the hydraulic oil discharged from the pressure accumulator 6'4 is selected by the main directional switching valve (CB) through the flow path CB). The center bypass type switching valve (to) moves from the neutral position (a) to the forward position (b).
), the hydraulic oil is sent from the first directional control valve (5) to the cylinder chamber of the actuator (9).
do. The hydraulic oil in the cylinder chamber is transferred from the second directional control *) to the center bypass type directional control valve (to) the oil tank.
Return to Center bypass type directional valve (7) is in reverse position (C)
When the switch is switched to , the hydraulic oil is sent from the second directional control valve (7) to the cylinder chamber, and the hydraulic oil in the cylinder chamber is transferred to the first directional control valve (7).
direction, from the control valve (b) to the center bypass type directional valve (g) and back to the oil tank (damage). In this way, the center bypass type directional control valve is switched according to the calculation result of the computer (A), and the rod of the actuator (9) moves forward or backward to optimally open or close the fuel injection valve (5). It is controlled by. Here, if an abnormality occurs in the CPUQI straddle diesel/L/@Seki IIl# circuit (20) and the like and the correct control signal cannot be output to the first drive circuit (a), the abnormality detection signal (53 ) occurs and the backup signal device (7) switches to the first. Second directional control valve cap 4th. Fifth directional control valve (6) fully energized'
At the same time, the main directional switching valve (A) is energized to switch the hydraulic oil flow path to the backup flow path (C), and the hydraulic oil that has exited the pressure accumulator is transferred to the third When the direction control outer ring of is always in position (a), the fourth direction control valve (the hydraulic oil in the cylinder chamber +561 is sent to the cylinder chamber φ uniformly through the four ) to the third directional control valve θ (J and return to the oil tank ■.
When the six directional control wheels detect the protrusion of the cam θΦ, one hydraulic oil is sent to the cylinder chamber 0 through the fifth directional control valve (b), and the hydraulic oil in the cylinder chamber 0 is transferred to the fourth directional control valve. ■
to the 8th directional control-jP)? Then return to the oil tank (b).

In the above embodiment, the center bypass type directional control valve (
to), the first and second directional control valves @ (to), the main directional control valve) and the fourth directional control valve. Although the fifth directional control valve (b) (6) has been described as an electromagnetic type, similar effects can be obtained by using a servo valve that operates partially or entirely using hydraulic pressure or pneumatic pressure.

In the above embodiment, the actuator (9) of the fuel injection valve (5) has been described, but other valves can be backed up in the same manner. It should be noted that the fuel pump (Ill) and fuel cutoff valve 11 (1) are configured so that they are not switched to an appropriate setting state when the backup signal device is switched in the event of an abnormality in the engine. In one case, one lift detection sensor is provided for each type of valve in each cylinder, and in the other case, one lift detection sensor is provided for one type of valve among the 1st to Nth cylinders. There is.

As explained above, according to the control backup device for an electronically controlled internal combustion engine of the present invention, when some abnormality occurs in the electronic control computer system, calculations etc. are performed by switching the second control valve. Operation control is backed up by simple ON-OFF using the recorder of the first control valve.

As a precaution, engine operation can be continued even during maintenance work on the electronic computer system, and the reliability of the electronically controlled internal combustion engine can be completely improved.

[Brief explanation of drawings]

Figure 1 shows the constituent quotient of the electronically controlled Diesel/l/engine;
The figure is a configuration diagram of an embodiment of the backup device of the present invention, and FIG. 8 is a detailed diagram of the main part of FIG. 2. (1)...Cylinder, (2)...Start valve, (3)...
...Air supply valve, (4)...Exhaust valve, (5)...Fuel injection valve, (6)-(9)...Actuator, (15
+...Crankshaft, θ9)...Central processing unit, 4.
・・Diesel engine control circuit, ][・・first and second suction circuits, station・control valve, e-currency・operation hydraulic pump,
(a)...pressure accumulator, ■...oil tank, (to)...
Flow rate control valve, (g)...Center bypass type directional control valve, @(to)...first and second directional control valve, (g)...
・Main directional control valve [second control valve], to)...Third directional control valve [first control valve], θ1))...Fourth and fifth directional control valves, ( Goods)...gear device, (45□)~
(45N)...Cam group, 1 barrel...Fuel injection #j square opening/closing timing memory cam [memory body], phrase...Backup signal device, 152)...Lift detection sensor, (C)...・・・
Backup channel agent Yoshihiro Morimoto Figure 2-295- Figure 3

Claims (1)

[Claims] 1. Detecting the crank angle of the internal combustion engine and calculating the opening/closing timing of the valves that need to be opened and closed during operation, and based on the calculation results, switching the direction of fluid leading to the valve drive actuator to open and close the valves. In an electronically controlled internal combustion engine that controls the internal combustion engine, there is provided a recording body that is connected to and driven by the crankshaft of the internal combustion engine and records in advance the opening/closing timing of the valve in correspondence with the U-turn angle, and a first control valve that reads timing and valve closing timing and switches the direction of fluid leading to the actuator; and an electronically controlled fluid flow path 1j that switches the direction of fluid to the actuator based on the calculation result. A control backup device for an electronically controlled internal combustion engine, comprising: a second control valve that switches from the first control valve to a backup fluid flow path side in which the first control valve is interposed.