JP2978961B2 - Electromagnetic drive valve control device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an electromagnetically driven valve of an internal combustion engine, and more particularly to a control device for an electromagnetically driven intake valve and / or an exhaust valve.

[0002]

2. Description of the Related Art A basic structure of an internal combustion engine in which an intake valve and / or an exhaust valve is driven by a spring and a solenoid is disclosed in U.S. Pat. No. 3,882,833. Further, as a control device for an internal combustion engine adopting such a basic configuration, a device in which the output timing of a drive signal supplied to a valve drive solenoid is changed in accordance with the engine speed is conventionally known ( JP-A-2-112
606).

Further, in the above basic configuration, there has been proposed a solenoid valve in which the structure of an electromagnetic drive mechanism is improved in order to minimize the required electromagnetic force of the solenoid (US Pat. No. 5,222,714). ).

[0004]

However, none of the above-mentioned prior arts takes into account the state of the intake valves or exhaust valves at the start of the internal combustion engine. And there was a risk of contact with the piston in the combustion chamber. Further, the electromagnetic drive mechanism does not operate at all due to disconnection of a wiring for supplying a drive signal, but an electromagnetic drive valve control device having a function of detecting such a failure has not yet been proposed.

The present invention has been made in view of such a point. At the time of starting the engine, the operation of the electromagnetically driven intake valve and / or the exhaust valve is appropriately controlled so that these valves and the piston can be moved. It is a first object of the present invention to provide an electromagnetically driven valve control device capable of preventing contact of the electromagnetically driven device and reliably starting the electromagnetically driven valve, and further provides an electromagnetically driven valve control device capable of easily detecting a failure of the electromagnetically driven mechanism. Is a second purpose.

[0006]

In order to achieve the first object, the present invention provides a starter for starting the internal combustion engine and at least one of an intake valve and an exhaust valve of the engine by electromagnetic force. An electromagnetically driven valve control device for an internal combustion engine, comprising: an electromagnetic drive means; a start signal detection means for detecting a start signal of the engine; a time measurement means for measuring an elapsed time after the detection of the start signal; and the starter means Starter operation prohibition time setting means for setting a prohibition time for prohibiting operation of the valve, valve closing control means for driving at least one of the intake valve and the exhaust valve to the closing side when the start signal is detected, and after the start signal is detected. When the elapsed time exceeds the prohibition time, starter operation permission means for permitting operation of the starter means is provided.

To achieve the same object, the present invention provides an internal combustion engine having starter means for starting the internal combustion engine, and electromagnetic drive means for driving at least one of an intake valve and an exhaust valve of the engine by an electromagnetic force. In the electromagnetically driven valve control device, a start signal detecting means for detecting a start signal of the engine, a closed state detecting means for detecting a closed state of at least one of the intake valve and the exhaust valve, and when the start signal is detected. Valve closing control means for driving at least one of the intake valve and the exhaust valve to the closing side, and starter operation permission for permitting operation of the starter means when a closed state of at least one of the intake valve and the exhaust valve is detected. Means is provided.

In order to achieve the second object, the present invention provides a starter means for starting a start of an internal combustion engine and an electromagnetic drive means for driving at least one of an intake valve and an exhaust valve of the engine by an electromagnetic force. An electromagnetically driven valve control device for an internal combustion engine, comprising: a start signal detecting unit that detects a start signal of the engine; a valve state detecting unit that detects a closed state of at least one of the intake valve and the exhaust valve; Time measuring means for measuring an elapsed time after detection of a start signal, starter operation prohibition time setting means for setting a prohibition time for prohibiting operation of the starter means, and at least one of the intake valve and the exhaust valve upon detection of the start signal Valve closing control means for driving the valve to the closing side, and closing at least one of the intake valve and the exhaust valve when the elapsed time after the detection of the start signal exceeds the prohibition time. If not detecting a state, in which the provided the malfunction determining failure determining means of said electromagnetic driving means.

[0009]

According to the first aspect of the present invention, when the start signal is detected, the intake valve and / or the exhaust valve are driven to the closing side, and when the elapsed time from the detection of the start signal exceeds the set prohibition time, The operation of the starter means for starting the engine is permitted.

According to the electromagnetically driven valve control device of the second aspect,
When the start signal is detected, the intake valve and / or the exhaust valve is driven to the closing side, and when the closed state of the intake valve and / or the exhaust valve is detected, the operation of the starter means for starting the engine is permitted.

According to a third aspect of the present invention, there is provided an electromagnetically driven valve control device.
When the start signal is detected, the intake valve and / or the exhaust valve are driven to the closing side, and when the elapsed time from the detection of the start signal exceeds the set prohibition time, the closed state of the intake valve and / or the exhaust valve is detected. If not, it is determined that the electromagnetic drive means has failed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing the structure of an electromagnetically driven intake valve 10 according to one embodiment of the present invention. This intake valve 1
Reference numeral 0 denotes a valve body 2 to which an armature 4 is fixed, and a valve driving unit 1 for driving the valve body 2. The valve body 2 is mounted above the combustion chamber via a valve guide 3 to open and close an intake port 8 of a combustion chamber of an internal combustion engine. Is done. An exhaust valve (not shown) has the same structure, and is mounted above the combustion chamber to open and close the exhaust port of the combustion chamber.

The valve drive unit 1 includes two opposed solenoids (electromagnets), that is, a closing solenoid 5 for urging the valve 2 in the valve closing direction and an opening solenoid 6 for urging the valve 2 in the valve opening direction. And the spring 7 as main components. The closing solenoid 5 includes a coil 5a and a magnetic body 5b.
And the opening-side solenoid 6 includes a coil 6a and a magnetic body 6b. When the armature 4 is at the neutral position BP, the biasing force on the valve body 2 becomes zero, and when the spring 7 is located above the neutral position BP, the spring 7 urges the valve body 2 in the valve opening direction. When it is located below, it is configured to urge the valve body 2 in the valve closing direction.

According to the above-described structure, by energizing the closing solenoid 5 or the opening solenoid 6, the valve 2
Moves between a fully closed position where the intake port 8 is closed and a fully opened position where the lift amount of the valve element is maximized. When the solenoids 5 and 6 are not energized, the valve body 2 is located at a neutral position between the fully closed position and the fully open position.

FIG. 2 is a diagram showing a configuration of the intake valve 10 and a control device thereof.
And a temperature sensor 12 for detecting the temperature TCOIL of the coil of the open solenoid 6
These detection signals are supplied to a CPU (central processing unit) 16 and a conduction time / timing control circuit unit 14 via an input / output interface 13. A sensor group (not shown) is further connected to the input / output interface 13. The input / output interface 13 includes a signal indicating an engine speed NE, an intake pipe absolute pressure PBA, an engine coolant temperature TW, an intake temperature TA, a battery voltage VB, and the like, a crankshaft rotation angle. Signal indicating
Signals indicating ON / OFF of the ignition switch and the like are input, and these signals are supplied to the CPU 16 and the power-on time / timing control circuit unit 14.

The CPU 16 is connected to a ROM 17 for storing a program executed by the CPU 16 and the like, and a RAM 18 for storing data in the middle of calculation, sensor detection data, and the like. Further, a timer counter 19 having a function as a timer is connected to the energization time / timing control circuit unit 14.
PU16, and the count value is set to C
This is performed by the PU 16.

The energization time / timing control circuit section 14 is connected to a driver circuit 15, the closing solenoid driving circuit 15a of the driver circuit 15 is connected to the coil 5a of the closing solenoid 5, and the opening solenoid driving circuit 15b is connected to the opening solenoid. 6 coils 6a. A battery 20 is connected to the driver circuit 15, and power is supplied from the battery 20. Control circuit unit 1
Reference numeral 4 controls the current supply (energization) to the coils 5a and 6a.

The CPU 1 other than the driver circuit 15
6, a power supply voltage is supplied from the battery 20 to other circuits such as the ROM 17 and the input / output interface 13 via a power supply circuit (not shown).

The engine of this embodiment is a four-cylinder engine in which each cylinder is provided with two intake valves and two exhaust valves. A total of 16 valves are electromagnetically driven. I have. Therefore, the energization time / timing control circuit 4, driver circuit 15, and timer counter 19 in FIG.
It is provided corresponding to each of the 16 valves.

The CPU 16 determines the opening timing and closing timing of the intake and exhaust valves according to input signals from various sensors, and sets the timer counter 19 corresponding to each intake and exhaust valve. The control of the engine start start timing described in (1) is performed.

Immediately after the ignition switch is turned on, no current is supplied to the solenoids 5 and 6, so that the valve bodies of the intake and exhaust valves are in the neutral position.

FIG. 3 is a flowchart of a process for controlling the engine start start timing.
Is executed at regular intervals (for example, 40 msec). 3 and FIG. 5 to be described later are based on the program notation of JIS X0128, that is, SPD (Structure).
d Programming Diagrams).

First, at step S1, the IG flag FL indicating "1" that the ignition switch has been turned on.
GIGON is “1”, and a step S described later
8 indicates that the setting of the down-count timer nSTT has been completed.
It is determined whether TT is "1". At first FLGSTT =
Since it is 0, steps S6 to S11 are executed, and this processing ends.

In step S6, the VB-nSTBASE table is searched according to the battery voltage VB, and the delay time from when the valve closing command signal is output to the intake valve and the exhaust valve to when the valve closing is actually completed is corresponded. The reference value nSTBASE of the delay count value is calculated. The VB-nSTBASE table is set such that, for example, as shown in FIG. 4A, the higher the battery voltage VB, the smaller the reference value nSTBASE.

Next, the coil temperature TCOIL of the solenoid 6
, A correction coefficient KTCO for searching the TCOIL-KTCOIL table and correcting the reference value nSTBASE.
IL is calculated (step S7). TCOIL-KTC
The OIL table is set to increase as the coil temperature TCOIL increases, for example, as shown in FIG.

In the following step S8, a delay count value nSTT is calculated by the following equation (1).

NSTT = KTCOIL × nSTBASE (1) Next, the timer flag FLGSTT is set to “1” (step S9), and the valve closing flag FLGEVAC indicating the output of the valve closing command signal of the intake / exhaust valve by “1” is set. The cranking permission flag F is set to "1" (step S10), and the cranking execution permission of the engine is indicated by "1".
LGCRK is set to "0" (step S11), and this processing ends.

At the next execution of this process, since the answer to step S1 is affirmative (YES), the process proceeds to step S2, where the delay count value nSTT is decremented, and it is determined whether or not the nSTT value is "0". When nSTT> 0, the cranking non-permission state is maintained (step S5), the process is terminated, and nSTT = 0, and when the set delay time has elapsed, the cranking permission flag FLGCRK is set. Is set to “1” to permit the start of cranking.

As described above, according to the present embodiment, the battery voltage VB starts when the valve closing command signal for the intake / exhaust valve is output.
Cranking is permitted after a delay time set according to the coil temperature TCOIL has elapsed, so that cranking is started after all the intake and exhaust valves have been closed, and the piston and the intake and exhaust valves come into contact with each other. And the engine can be reliably started.

FIG. 5 is a flowchart showing another embodiment of the engine start start timing control shown in FIG. This process is also executed by the CPU 16 at regular intervals (for example, every 40 msec).

Steps S21, S22 and S34 in FIG.
Steps S1, S2, and S39 in FIG.
This is the same process as 6 to S11. That is, step S
34 to S39, the delay count value nSTT and the flag F
After the settings of LGSTT, FLGEVAC, and FLGCRK are made, the nSTT value is decremented in step S22, and the process proceeds to step S23.

In step S23, it is determined whether or not a closing completion detection flag FLGINI indicating "1" indicating that the closing of all the intake and exhaust valves has been detected is "1". First F
Since LGINI = 0, the process proceeds to step S25, and it is determined whether or not the closing of all the intake and exhaust valves is detected. This determination is made based on the output of the position sensor 11 provided for each valve.

At first, the answer in step S25 is negative (NO).
Therefore, in steps S27 and S28, the valve closing completion detection flag FLGINI and the cranking permission flag FLG
Set both CRK to “0” and then delay count value n
STT = 0 and the valve closing completion detection flag FLGI
It is determined whether NI is "0" (step S2).
9). At first, since this answer is also negative (NO), the process proceeds to step S32, where the cranking permission flag FLGCRK is set.
Is set to “0”, and this processing ends.

Thereafter, the answer to step S25 is affirmative (YE
S), that is, when the completion of closing of all the intake and exhaust valves is detected, the valve closing completion detection flag FLGINI is set to “1” (step S26), this processing is ended, and the answer of step S23 is affirmative at the next execution. (YES), the cranking permission flag FLGCRK is set to "1" (step S24), and the start of cranking is permitted.

On the other hand, if the set delay time has elapsed and the delay count value nSTT becomes "0" before the completion of closing of all the intake and exhaust valves is detected, the answer to step S29 is affirmative (YES). Become. In this case, despite the output of the valve closing command signal, the closing of all the intake and exhaust valves has not been completed within the set delay time. Is determined to have failed,
The failure determination flag FLGFEVA is set to "1" (step S30), the cranking is not permitted (step S28), and the process ends.

As described above, in this embodiment, the position sensor 1
When the completion of the closing of all the intake and exhaust valves is detected by (1), the start of cranking is permitted, so that the piston and the intake and exhaust valves are prevented from coming into contact with each other and the engine is started reliably. Can be.

If the closing of all intake and exhaust valves is not completed within the set delay time, it is determined that a failure has occurred in the drive system of one of the intake and exhaust valves.
A failure of the electromagnetically driven intake / exhaust valve can be easily detected.

In the above-described embodiment, both the intake valve and the exhaust valve are of the electromagnetic drive type. However, the present invention is not limited to this, and either one may use a conventional mechanical drive mechanism.

In the above-described embodiment, the coil temperature T
Although COIL is detected by the sensor, COIL may be estimated, for example, as a function of the engine coolant temperature TW or the intake air temperature TA, or as a function of the engine coolant temperature TW or the intake air temperature TA.

[0041]

As described above in detail, according to the electromagnetically driven valve control device of the first aspect, when the start signal is detected, the intake valve and / or the exhaust valve are driven to the closing side, and the elapsed time from the start signal is detected. Exceeds the set prohibition time, the operation of the starter means for starting the engine is permitted, so that the intake valve and / or
Alternatively, contact between the exhaust valve and the piston can be prevented, and reliable starting can be performed.

According to the second aspect of the present invention, when the start signal is detected, the intake valve and / or the exhaust valve is driven to the closing side, and the closed state of the intake valve and / or the exhaust valve is detected. Then, the operation of the starter means for starting the engine is permitted, so that the same effect as that of the first aspect is obtained.

Further, according to the electromagnetically driven valve control device of the third aspect, when the start signal is detected, the intake valve and / or the exhaust valve are driven to the closing side, and the elapsed time from the detection of the start signal exceeds the set prohibition time. At this time, if the closed state of the intake valve and / or the exhaust valve has not been detected, it is determined that the electromagnetic drive unit has failed, so that failure detection can be easily performed.

[Brief description of the drawings]

FIG. 1 is a view showing the structure of an electromagnetically driven intake valve according to one embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of an intake valve and a control device thereof in FIG. 1;

FIG. 3 is a flowchart of a process for controlling the engine start start timing.

FIG. 4 is a diagram showing a table for setting a delay time.

FIG. 5 is a flowchart of a process for controlling the engine start start timing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve drive part 5 Closed solenoid 6 Open solenoid 7 Spring 10 Intake valve 11 Position sensor 12 Coil temperature sensor 16 CPU

Continuation of the front page (56) References JP-A-5-79307 (JP, A) JP-A-63-198779 (JP, A) JP-A-3-189310 (JP, A) JP-A-62-243909 (JP, A) , A) (58) Field surveyed (Int.Cl. ⁶ , DB name) F01L 9/04 F02D 11/10 F02D 41/22 320 F02N 11/08 F02D 13/02

Claims (3)

(57) [Claims] 1. An electromagnetically driven valve control apparatus for an internal combustion engine, comprising: starter means for starting a start of an internal combustion engine; and electromagnetically driving means for driving at least one of an intake valve and an exhaust valve of the engine by an electromagnetic force. Start signal detection means for detecting a start signal of the engine; time measurement means for measuring an elapsed time after detection of the start signal; starter operation prohibition time setting means for setting a prohibition time for prohibiting operation of the starter means. When the start signal is detected, at least one of the intake valve and the exhaust valve is driven to the closing side, and when the elapsed time after the detection of the start signal exceeds the prohibition time, the operation of the starter means is performed. An electromagnetically driven valve control device for an internal combustion engine, comprising: starter operation permission means for permitting. 2. An electromagnetically driven valve control apparatus for an internal combustion engine, comprising: starter means for starting a start of the internal combustion engine; and electromagnetically driving means for driving at least one of an intake valve and an exhaust valve of the engine by an electromagnetic force. Starting signal detecting means for detecting a starting signal of the engine; closing state detecting means for detecting a closing state of at least one of the intake valve and the exhaust valve; and at least one of the intake valve and the exhaust valve when the starting signal is detected. Valve closing control means for driving one to the closing side; and starter operation permission means for permitting operation of the starter means when detecting a closed state of at least one of the intake valve and the exhaust valve. Control device for an internal combustion engine. 3. An electromagnetically driven valve control apparatus for an internal combustion engine, comprising: starter means for starting the internal combustion engine, and electromagnetically driving means for driving at least one of an intake valve and an exhaust valve of the engine by electromagnetic force. Starting signal detecting means for detecting a starting signal of the engine; closing state detecting means for detecting a closing state of at least one of the intake valve and the exhaust valve; and time measurement for measuring an elapsed time after the detection of the starting signal. Means, starter operation prohibition time setting means for setting a prohibition time for prohibiting the operation of the starter means, and valve closing control means for driving at least one of the intake valve and the exhaust valve to the closing side upon detection of the start signal, When the elapsed time after the detection of the start signal exceeds the prohibition time, if the closed state of at least one of the intake valve and the exhaust valve is not detected, the electromagnetic drive is performed. An electromagnetically driven valve control device for an internal combustion engine, comprising: a failure determination unit that determines that a driving unit has failed.