JPH0629473Y2 - Controller for mechanical turbocharger - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a control device for a mechanical supercharger equipped with an engine, and particularly to a mechanical supercharger suitable for an engine for a large vehicle such as a truck. The control device of the machine.

[Conventional technology]

2. Description of the Related Art Conventionally, an engine with a mechanical supercharger has been proposed in order to supplement the supercharging characteristics in a low rotation range of an engine, which is difficult to compensate with a turbocharger.

In particular, for large vehicles such as trucks that require high torque when the engine is under heavy load (starting with a full load of luggage) in a low engine speed range, a mechanical type with a higher gear ratio connected to the crankshaft of the engine There is one configured to supercharge the engine by rotating the supercharger at high speed only in a low engine speed range.

Then, when the engine reaches the high speed range, the mechanical supercharger becomes overspeed (overspeed) due to the increased gear ratio, which may cause a failure. An electromagnetic clutch and a control system for holding the electromagnetic supercharger in a disengaged state as soon as the mechanical supercharger is over-rotated, are provided at the connection portion with.

[Problems to be solved by the invention]

By the way, in the conventional mechanical supercharger as described above, in order to prevent the failure thereof, it is desirable that the connection with the engine is surely cut off when the engine reaches the high speed range.

However, in the conventional control device for the mechanical supercharger, when the control system or the like fails, a safety circuit for detecting the failure and holding the electromagnetic clutch in the disengaged state is not provided. If a part such as the above fails and the electromagnetic clutch is held in the contact state, there is a problem that the mechanical supercharger is damaged due to over-rotation.

The present invention is intended to solve the above-mentioned problems. Even if a failure occurs in the control system or the like, the electromagnetic clutch is held in the disengaged state to prevent the mechanical supercharger from over rotating. An object of the present invention is to provide a control device for a mechanical supercharger capable of reliably preventing breakage.

[Means for solving problems]

In order to achieve the above-mentioned object, a controller of a mechanical supercharger of the present invention is a mechanical supercharger which is installed in an intake passage of an engine and is driven by the engine. An engine speed sensor for detecting the number of revolutions of the engine, having an electromagnetic clutch that connects the engine and the mechanical supercharger only when a connection signal is input to the power transmission system to the machine, and An acceleration operation sensor for detecting an acceleration operation of the engine is provided, and based on the detection signals from the rotation speed sensor and the acceleration operation sensor, the rotation speed of the engine is within a predetermined low rotation range, and A first control system that outputs a connection signal to the electromagnetic clutch is provided only when an acceleration operation is performed, and a mechanical system that detects the rotational speed of the mechanical supercharger. A feeder rotation speed sensor is provided, and when the rotation speed of the mechanical supercharger exceeds a predetermined value based on a detection signal from the sensor, the electromagnetic control is given priority over the control of the first control system. It is characterized in that a second control system for switching the clutch to the disengaged state is provided.

[Action]

In the control device for the mechanical supercharger of the present invention described above, the first control system receives the detection signals from the engine speed sensor and the acceleration operation sensor to perform the acceleration operation in the low engine speed region. When this is detected, the electromagnetic clutch is switched to the contact state, and the engine is supercharged by the mechanical supercharger.

Further, when the second control system receives the detection signal from the mechanical supercharger rotation speed sensor and detects that the mechanical supercharger is over-rotating, the control by the first control system is prioritized. Then, the electromagnetic clutch is switched to the disengaged state.

〔Example〕

A control device for a mechanical supercharger as one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows an example in which the device is attached to an engine provided with a mechanical supercharger and a turbocharger. 2 is an electric circuit diagram thereof, and FIG. 3 is an overall configuration diagram showing an example in which the present apparatus is attached to an engine with a mechanical supercharger.

In FIG. 1, a turbine 3 is installed in an exhaust passage 2 of an engine 1, and a compressor 4 driven by a shaft of the turbine 3 is installed in an intake passage 5 and A turbo supercharger is configured with the compressor 4.

A check valve 6 is inserted on the downstream side (engine 1 side) of the compressor 4 in the intake passage 5, and the upstream side and the downstream side that sandwich the check valve 6 are connected to each other to form a bypass passage. 5a is provided. A mechanical supercharger 7 is interposed in the bypass passage 5a.

A pulley 9 is attached to the mechanical supercharger 7, and a pulley 1 is attached to a crankshaft 10 of the engine 1.
0a is attached, and these pulleys 9 and 10a are connected by a belt 11.

The electromagnetic clutch 8 is interposed in the power transmission system including the pulleys 9 and 10a and the belt 11. The electromagnetic clutch 8 is interposed on the rotary shaft 7a between the mechanical supercharger 7 and the pulley 9, and is normally kept in a disengaged state.
It is set to be in a contact state when an electric current is supplied.

The electromagnetic clutch 8 is connected to a control device for a mechanical supercharger that controls the connection / disconnection operation.

As shown in FIG. 2, the control device for this mechanical supercharger is
Electromagnetic clutch 8, a first control system 16 for controlling the electromagnetic clutch 8, a second control system 25, and a sensor section for sending detection signals of various states in the engine 1 etc. to the control systems 16 and 25. 37 and the first and second control systems 1
Display unit 26 for displaying the states of 6, 25 and the battery 2
It is composed of 2 and.

The sensor unit 37 connected to the first control system 16 is provided with an engine rotation speed sensor 12 that detects the rotation speed of the engine 1, and further includes an injection pump rack position sensor 14 that detects the rack position of the injection pump, and a transmission. And a transmission neutral position sensor 15 which detects the gear position of the vehicle and is turned on at the neutral position.

The engine speed sensor 12 includes an F / V converter 13 for converting a signal from the engine speed sensor 12 into a voltage.
Are connected. And these sensors 12, 13,
A sensor unit 37 is configured by 14, 15 and the converter 13, and a mechanical supercharger rotation speed sensor 27 described later.

The output from the F / V converter 13 is connected to the (+) side of the first comparator 17a and is also connected to the (-) side of the second comparator 17b.

In addition, the first setter 18a includes a first comparator 17a.
Connected to the (+) side of the second setter 18b
Is connected to the (+) side of the second comparator 17b.

The output sides of the first and second comparators 17a and 17b are connected to the input side of the first AND circuit 19a.

The output from the injection pump rack position sensor 14 of the sensor unit 37 is connected to the (+) side of the third comparator 17c, and the third setter 18c is connected to the (-) side of the third comparator 17c. ing.

The output side of the first AND circuit 19a is connected to one input side end of the second AND circuit 19b, and the output of the third comparator 17c is connected to the other input side end of the second AND circuit 19b. The sides are connected.

The output side of the second AND circuit 19b is connected to one input side end of the third AND circuit 19c, and the transmission neutral position of the sensor unit 37 is connected to the other input side end of the third AND circuit 19c. The output from the sensor 15 is connected via a knot circuit 19d.

The output from the third AND circuit 19c is connected to the base side of the transistor 21 via the resistor 20, the emitter side is grounded (grounded), and the collector side is connected to the solenoid section 34a of the relay 34. ing.

Further, the solenoid portion 34a of the relay 34 is connected to the solenoid portion 33a of the relay 33, and
The solenoid portion 33a of is connected to the battery 22.

Further, the battery 22 is connected to one end of the electromagnetic clutch 8 via the normally open switch portion 33b of the relay 33 and the normally open switch portion 34b of the relay 34.

The sensor unit 37 connected to the second control system 25 is provided with a mechanical supercharger rotation speed sensor 27 for detecting the rotation speed of the mechanical supercharger 7, and the mechanical supercharger rotation speed sensor. F / V converter 28 for converting the signal of 27 into voltage
Are connected.

The output from the F / V converter 28 is the comparator 29.
The setting device 30 is connected to the (+) side of the comparator 29.

The output of the comparator 29 is connected to the base side of the transistor 32 via a resistor 31, the emitter side is grounded (grounded), and the collector side is a relay 36.
Is connected to the solenoid 36a.

The solenoid 36a of the relay 36 is connected to the solenoid 35a of the relay 35, and the solenoid 35a of the relay 35 is connected to the battery 22.

Further, the battery 22 is connected to the normally closed switch portion 35c of the relay 35 and the normally closed switch portion 36c of the relay 36, and is grounded (grounded) via the switch portion 35c and the switch portion 36c.

One end of the electromagnetic clutch 8 is connected to the switch parts 33b and 34b of the first control system 16, and the other end is a normally open switch part 35b of the relay 35 and a normally open switch part of the relay 36 of the second control system 25. In addition to being connected to 36b, the switch portion 36b is grounded.

The relays 35 and 36 are interlocking switches having two switch parts.

The above-mentioned sensor 27, converter 28, setting device 3
0, comparator 29, resistor 31, transistor 3
The second control system 25 includes the relays 35 and 36.

A light emitting diode 24a, which is grounded via a resistor 23a, is connected between the switch portion 33b of the relay 33 and the switch portion 34b of the relay 34, and the switch portion 34b of the relay 34 and the electromagnetic clutch 8 are connected. A light emitting diode 24b, which is grounded, is connected via a resistor 23b.

Further, a light emitting diode 24c, which is grounded (grounded) via a resistor 23c, is connected between the switch portion 35c of the relay 35 and the switch portion 36c of the relay 36, and the switch portion 36c of the relay 36 and the ground. (ground)
A light emitting diode 24d, which is grounded, is connected via a resistor 23d.

Then, the above-mentioned light emitting diodes 24a, 24b, 24c,
The display unit 26 is configured by 24d and the resistors 23a, 23b, 23c, and 23d.

The injection pump rack position sensor 14, the transmission neutral position sensor 15, and the comparator 1 described above are also provided.
7c, the third setting device 18c, the knot circuit 19d, and the AND function of the detection signal which is the injection pump rack position above a predetermined level in the AND circuit 19c and the gear stage detection signal other than the neutral position cause the acceleration operation sensor to operate. Composed.

Since the control device for the mechanical supercharger as the embodiment of the present invention is configured as described above, the engine speed detected by the engine speed sensor 12 of the first control system 16 in the same control device. N _E and the set rotational speeds N _S and N _L set by the setting machines 18a and 18b are compared by the comparators 17a and 17b.
And is continuously compared.

The engine speed N _E referred to here is the engine 1
Is the actual rotation speed of. The set rotation speed N _S is lower than the idle rotation speed of the engine 1 and is a rotation speed when the engine is stopped, that is, higher than zero, and is a rotation speed for determining disconnection or failure of components or the like.

Further, the set rotation speed N _L is a limit maximum rotation speed of the engine corresponding to a high rotation speed such that the mechanical supercharger 7 is not damaged (for example, in the diesel engine of a large truck, 10
00 _rpm ).

The first comparator 17a outputs the first comparator 17a when N _E > N _S.
And the second comparator 17b outputs it to the first AND circuit 19a when N _E <N _L.

The first AND circuit 19a outputs to the one end on the input side of the second AND circuit 19b when N _S <N _E <N _L , and the third comparator 17c serves as an injection pump constituting an acceleration operation sensor. Detection value R _W of the rack position sensor 14
Is greater than the set value R _WO , 19 of the second AND circuit
Output to the other input side of b.

Further, the transmission neutral position sensor 15 that constitutes the acceleration operation sensor detects a signal that is turned on at the neutral position and turned off when being input to any gear, and the input side of the third AND circuit 19c is detected. Is output to one end of the second AND circuit 19
The output of b is input.

As described above, the acceleration operation sensor includes the injection pump rack position sensor 14 and the transmission neutral position sensor 1.
When the rack position of the injection pump is equal to or greater than the set value and the transmission is not in neutral, it is detected that the gear is being input to any gear.

When each condition is met, that is, engine 1
When the accelerating operation is performed in the low rotation speed range, a high level signal is output from the third AND circuit 19c to the base of the transistor 21 via the resistor 20, and the switching operation is performed.

When a voltage is applied to the base of the transistor 21, the collector and the emitter are electrically connected and short-circuited.

Along with this, the relay 3 connected to the collector side
Battery 22 to solenoids 33a, 34a of 3, 34
A current is supplied from the solenoids 33a, 34a to excite the solenoids 33a, 34a to close the switch portions 33b, 34b of the relays 33, 34.

Further, the mechanical supercharger rotational speed N _M detected by the mechanical supercharger rotational speed sensor 27 and the set rotational speed N _H set by the setter 30 are output to the comparator 29 for continuous comparison. .

It should be noted that the mechanical supercharger rotational speed N _M mentioned here is the actual rotational speed of the mechanical supercharger 7. The set rotation speed N _H is a limit maximum rotation speed of the mechanical supercharger 7 that corresponds to a high rotation speed that does not damage the mechanical supercharger 7.

The comparator 29, when the detection value N _M of the mechanical supercharger rotation speed sensor 27 is smaller than the set value N _H (N _M <N _H ),
A high level signal is output to the base of the transistor 32 via the resistor 31 and switching operation is performed.

Along with this, the relay 3 connected to the collector side
Current is supplied from the battery 22 to the solenoids 35a and 26a of the solenoids 5 and 36, and the solenoids 35a and 36a are excited,
The switch parts 35b and 36b of the relays 35 and 36 are closed.

The switch parts 35c and 36c of the relays 35 and 36 are normally closed, but they are opened as the switch parts 35b and 36b are closed.

As a result, a circuit from the battery 22 to the ground via the electromagnetic clutch 8 is formed.
A voltage is supplied to the electromagnetic clutch 8, which is normally kept in the disengaged state, is maintained in the contact state.

The above operating state is the light emitting diode 2 of the display unit 26.
4a to 24d, the light emitting diodes 24a and 24b are turned on when the electromagnetic clutch 8 is operating, and the light emitting diodes 24c and 24d are turned on when the electromagnetic clutch is not operating.

Then, when the engine 1 becomes a high speed, the engine speed sensor 12 detects this, and the first control system 16 holds the electromagnetic clutch 8 in the original state, that is, the disengaged state, and the mechanical supercharger 7 operates. Surely prevent damage due to excessive rotation.

The two relays 33 and 34 are provided on the collector side of the transistor 21 in order to prevent sticking (maintenance of the closed state) due to a failure of the relays 33 and 34. This is because even if 27 (28) fails, the other relay 28 (27) is opened, the current supply from the battery 22 is cut off, and the electromagnetic clutch 8 is held in the disengaged state.

Further, even if a failure occurs in the first control system 16 or the like and the electromagnetic clutch 8 is held in the contact state, the mechanical supercharger 7 of the mechanical supercharger 7 of the sensor unit 37 detects the mechanical supercharger rotation speed sensor 27. Based on the rotation speed, the second control system detects the over-rotation state of the mechanical supercharger 7 and positively holds the electromagnetic clutch 8 in the original state, that is, the disengaged state. Surely prevent damage due to excessive rotation.

In addition, two relays 3 are provided on the collector side of the transistor 32.
5, 36 are provided to prevent sticking (maintenance of closed state) due to a failure of the relays 33, 34,
Even if one of the relays 35 (36) fails, the other relay 36 (35) is opened, the supply of the current from the battery 22 is shut off, and the electromagnetic clutch 8 is held in the disengaged state. is there.

Further, the predetermined low speed range is a case where the condition of N _S <N _E <N _L is satisfied, and as an example, a large diesel engine having an idling speed of 450 _rpm and a maximum speed of 2200 _rpm is taken as an example. Looking at it, the set speed N
_{Since S} may be lower than the idle speed and higher than zero, it can be set to about 200 _rpm, and the set speed N _L of the engine corresponding to a high speed that does not damage the mechanical supercharger 7. 1000 because it is the maximum speed limit
Can be set to _rpm .

Therefore, the predetermined low speed range of this large diesel engine is 200 _rpm <N _E <where the actual speed is N _E.
It will be 1000 _rpm .

By setting the rotation speed in this manner, the set value N _S is higher than the low-level detection signal N _e even if the sensor output N _e becomes low level when the engine speed sensor 12 is disconnected. Since it is set, N _e <N _S
When it is determined that the engine speed sensor 12 is broken or broken, the electromagnetic clutch 8 is detected not only in the high speed range of the engine 1 but also in the sensor malfunction.
Can be reliably held in a disconnected state.

Further, whether the engine 1 is operating normally under the condition that the engine speed is N _S <N _E <N _L is determined by the light emitting diode 24.
It is lit and displayed with a and 24b.

Further, when the relays 33 and 34 are activated, the light emitting diode 24
a and 24b are lit up and displayed.

Furthermore, when the relays 35 and 36 are activated, the light emitting diode 2
4c and 24d are lit and displayed.

Note that, as shown in FIG. 3, the present device may be applied to an engine with a mechanical supercharger that is not equipped with a turbocharger, and it is possible to obtain substantially the same operational effects as the present embodiment. it can.

An accelerator pedal depression amount sensor may be used as the acceleration operation sensor, and the position signal from the injection pump rack position sensor 14 or the detection signal from the accelerator pedal depression amount sensor may be differentiated. .

[Effect of device]

As described above in detail, according to the control device for the mechanical supercharger of the present invention, the first control system receives the detection signals from the engine speed sensor and the acceleration operation sensor and operates in the low engine speed range. Then, when it is detected that the acceleration operation is performed,
The electromagnetic clutch is switched to the contact state, the mechanical supercharger supercharges the engine, and the second control system
When the detection signal from the mechanical supercharger rotation speed sensor is received and it is detected that the mechanical supercharger is over-rotating, the electromagnetic clutch is switched to the disengaged state prior to the control by the first control system. Therefore, it is possible to reliably prevent the mechanical supercharger from being damaged due to excessive rotation.

In addition, a relatively inexpensive and simple structure can be obtained.

[Brief description of drawings]

1 to 3 show a control device for a mechanical supercharger as an embodiment of the present invention, and FIG. 1 shows this device in an engine equipped with a mechanical supercharger and a turbocharger. 2 is an overall configuration diagram showing an attached example, FIG. 2 is an electric circuit diagram thereof, and FIG. 3 is an overall configuration diagram showing an example in which the present device is attached to an engine with a mechanical supercharger. 1 ... Engine, 2 ... Exhaust passage, 3 ... Turbine, 4
...... Compressor, 5 ...... Intake passage, 5a ...... Bypass passage, 6 ...... Check valve, 7 ...... Mechanical supercharger, 7a ...... Rotary shaft, 8 ...... Electromagnetic clutch, 9 ...... Pulley, 10 ... crankshaft, 10a ... pulley, 11 ... belt,
12 ... Engine speed sensor, 13 ... F / V converter, 14 ... Injection pump rack position sensor that constitutes acceleration operation sensor, 15 ... Transmission neutral position sensor that constitutes acceleration operation sensor, 16 ... First Control system, 17a, 17b, 17c, ... Comparator, 18a,
18b, 18c ... Setting device, 19a, 19b, 19c ... AND circuit, 19d ... Knot circuit, 20 ... Resistor, 2
1 ... Transistor, 22 ... Battery, 23a, 2
3b, 23c, 23d ... resistors, 24a, 24b, 24c,
24d: light emitting diode, 25: second control system, 2
6 ... Display unit, 27 ... Mechanical supercharger speed sensor, 2
8 ... F / V converter, 29 ... comparator, 30
…… Setter, 31 …… Resistor, 32 …… Transistor,
33, 34, 35, 36 ... Relay, 37 ... Sensor section.

Continued Front Page (72) Creator Kawaji St. 5-3-8 Shiba, Minato-ku, Tokyo Within Mitsubishi Motors Corporation (72) Creator Koji Ogita 5-33-8 Shiba, Minato-ku, Tokyo Mitsubishi Motors Corporation Stock In-house (56) References JP-A-57-203823 (JP, A) JP 59-33861 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A mechanical supercharger installed in an intake passage of an engine and driven by the engine, wherein a connection signal is input via a power transmission system from the engine to the mechanical supercharger. With an electromagnetic clutch connecting the engine and the mechanical supercharger only at times, an engine speed sensor for detecting the engine speed and an acceleration operation sensor for detecting an acceleration operation of the engine are provided, and Based on the detection signals from the rotation speed sensor and the acceleration operation sensor, the connection signal to the electromagnetic clutch is generated only when the rotation speed of the engine is within a predetermined low rotation speed range and the acceleration operation of the engine is being performed. Is provided with a first control system for outputting the rotation speed, and a mechanical supercharger rotation speed sensor for detecting the rotation speed of the mechanical supercharger. A second control system for switching the electromagnetic clutch to the disengaged state is prioritized over the control of the first control system when the rotational speed of the mechanical supercharger exceeds a predetermined value based on the detection signal from the above. A control device for a mechanical supercharger, which is provided.