JPWO2019116738A1 - Internal combustion engine drive control device and internal combustion engine drive control method - Google Patents

Abstract

It enables PTO operation that ensures the same operability and convenience as the PTO dedicated volume by diverting existing components without installing a new PTO dedicated volume. The electronic control unit 500 detects the on / off of the PTO main switch based on the on / off signal of the PTO main switch input from the outside, and is continuously variable when the vehicle stop information input from the outside is detected. The set value of the volume is temporarily set as the set value of the PTO volume, the target torque according to the set value is calculated, and the fuel injection control for controlling the fuel injection to the internal combustion engine is calculated in advance. Require execution of fuel injection according to the target torque.

Description

The present invention relates to an internal combustion engine drive control device and an internal combustion engine drive control method, and is particularly suitable for application to an internal combustion engine drive control device and an internal combustion engine drive control method having a power take-off function.

In specially equipped vehicles such as crane trucks, refrigerator trucks, and mixer trucks, a power take-off (PTO) that distributes part or most of the engine output as torque required for the operation of special equipment such as cranes. ) It is well known that it has a function (see, for example, Patent Document 1 and the like).

For setting and adjusting the desired torque, an accelerator pedal for traveling, a PTO dedicated accelerator volume or a PTO dedicated switch provided exclusively for adjusting the torque amount of the PTO, or the like is often used.

There are cases where the operation outside the vehicle is suitable (for example, a crane vehicle) and cases where the operation at the driver's seat is suitable (for example, a road cleaning vehicle), and the needs of the operator are the needs of the vehicle. It varies depending on the type.
In particular, for PTO operation outside the vehicle, from the viewpoint of convenience for the operator, it has been common to provide a PTO dedicated accelerator volume and a PTO dedicated switch as described above and use them. In general, only the accelerator pedal can be used for PTO operation in the driver's seat.

JP-A-2015-130800

However, in a vehicle where the space for arranging parts and the simplification of the configuration are constantly required, arranging a PTO dedicated volume according to special equipment and similar parts is not only a problem of arranging space. However, it is desirable to avoid it as much as possible because it causes an increase in assembly work and the like in the manufacturing process and an increase in inspection processes.
On the other hand, it is naturally desired for the operator to set the PTO required torque required for driving the special equipment as easily as possible and to have good operability.

The present invention has been made in view of the above circumstances, and the operability equivalent to that of the PTO dedicated volume by diverting the existing components without newly installing the PTO dedicated volume for the setting operation of the PTO required torque in the driver's seat. The present invention provides an internal combustion engine drive control device and an internal combustion engine drive control method that enable PTO operation while ensuring convenience.

In order to achieve the above object of the present invention, the internal combustion engine drive control device according to the present invention is
An internal combustion engine drive control device that uses an electronic control unit (500) to perform a power take-off control operation that supplies part of the power of an internal combustion engine to special equipment.
The electronic control unit (500)
Equipped with a PTO required torque adjustment setting unit (50) that adjusts the magnitude of torque required for power take-off.
The PTO required torque adjustment setting unit (50) is
On / off of the cruise main switch that detects the on / off of the PTO main switch based on the on / off signal of the PTO main switch input from the outside, and turns on / off the execution of the constant speed running control input from the outside. When the off of the cruise main switch is detected based on the signal,
The set value input by the existing adjustment setting unit (60) is temporarily set as the set value of the PTO required torque adjustment setting unit (50).
Calculate the target torque according to the set value of the PTO required torque adjustment setting unit (50), and calculate
It is characterized in that the fuel injection control for controlling the fuel injection to the internal combustion engine is required to execute the fuel injection according to the target torque.

According to the present invention, by using the existing adjustment setting unit, it is possible to perform PTO operation with the same operability and convenience as the PTO dedicated volume without adding a new component. Therefore, the device configuration can be configured. It has the effect of contributing to simplification and price reduction.

It is a functional block diagram which represented the function required for the internal combustion engine drive control device in order to execute the internal combustion engine drive control process in the embodiment of this invention in the internal combustion engine drive control device. It is a flowchart which shows the procedure of the first half of the internal combustion engine drive control processing in embodiment of this invention. It is a flowchart which shows the procedure of the latter half of the internal combustion engine drive control processing in embodiment of this invention. It is a schematic diagram which shows typically the change example of the PTO required torque with respect to the change of the set value of a PTO volume, and the change example of an engine speed and a target torque with respect to the change of PTO required torque.

Hereinafter, the present embodiment will be described with reference to FIGS. 1 to 4.
The members and arrangements described below are not limited to the present invention, and can be variously modified within the scope of the gist of the present invention.
The internal combustion engine drive control device according to the embodiment of the present invention is suitable for a specially equipped vehicle such as a road cleaning vehicle, and particularly suitable for a vehicle in which a PTO (power take-off) operation is desired in the driver's seat. Specific examples of such a specially equipped vehicle include a road cleaning vehicle and the like.

The electronic control unit (ECU) 500 shown in FIG. 1 performs engine control, injection control, and the like of a special vehicle.
In the electronic control unit 500, in addition to the conventional execution functions such as engine control processing, the PTO required torque adjustment setting unit 50 is formed by software to execute the internal combustion engine drive control processing according to the embodiment of the present invention. It is possible.
The procedure of the internal combustion engine drive control process executed by the electronic control unit 500 will be described with reference to the flowcharts shown in FIGS. 2 and 3, and the functional block of FIG. 1 will be referred to as necessary.

First, the internal combustion engine drive control process according to the embodiment of the present invention will be described in detail.
This internal combustion engine drive control process is a new component that enables the volume and switch generally provided in the vehicle to be diverted to the setting operation of the PTO required torque, particularly regarding the setting operation of the PTO required torque in the driver's seat. It is possible to realize convenience of PTO operation in a special vehicle, simplification of the configuration, etc. without requiring addition.

Hereinafter, a specific description will be given.
When the execution of the internal combustion engine drive control process by the electronic control unit 500 is started, it is first determined whether or not the PTO main switch (not shown) is turned on (see step S100 in FIG. 2).
The PTO main switch is not unique to the present invention, but is standard equipment on a special vehicle.

An on / off signal of the PTO main switch is input to the electronic control unit 500 from the outside via the interface circuit 1.

If it is determined that the PTO main switch is not on (NO), it is assumed that the PTO main switch is off, and the process proceeds to step S240 (see FIG. 3) described later.
On the other hand, when it is determined that the PTO main switch is ON (YES), each process of step S110, step S140, step S150 and step S200 (see FIG. 3) is executed in a time-division manner.

In step S140, the PTO required torque set by operating the PTO accelerator volume (not shown) is calculated and calculated.
Here, the PTO accelerator volume is provided exclusively for PTO operation, but is not necessarily essential. The internal combustion engine drive control process according to the embodiment of the present invention originally enables the existing adjustment setting means to be diverted to the PTO operation without providing the adjustment setting means dedicated to the PTO operation such as the PTO accelerator volume. The process of step S140 can be applied even when there is a PTO accelerator volume dedicated to PTO operation.

The PTO accelerator volume is configured to be rotatable in a predetermined angle range and adjusts the PTO required torque, and the PTO required torque is set to a desired value between 0 and 100% in the rotating range. It is possible.

The correlation between the set position (rotation position) of the PTO accelerator volume and the PTO required torque with respect to the set position is predetermined, but the correlation is changed according to the usage pattern, that is, for example, a diagnostic tester or the like (Fig. It can also be rewritten using)). In step S140, the PTO required torque corresponding to the set position of the PTO accelerator volume is calculated using a predetermined calculation formula based on the correlation.

In the embodiment of the present invention, the set value of the PTO accelerator volume is input to the electronic control unit 500 from the outside as a voltage signal via the analog-digital converter 2.
Similarly, the amount of depression of the accelerator pedal, which will be described later, is input to the electronic control unit 500 as a voltage signal via the analog-digital converter 3. Furthermore, the set value of the PTO volume is input as a voltage signal via the analog-digital converter 4.
Further, an on / off signal of a pair of switches (increase / decrease switch) that can be increased / decreased is input to the electronic control unit 500 from the outside via the interface circuit 5.
In the embodiment of the present invention, the amount of depression of the accelerator pedal, the set value of the PTO accelerator volume, the set value of the PTO volume, and the signal of the increase / decrease switch, which are input from the outside, form the existing adjustment setting unit 60. There is.
In particular, the PTO volume and the increase / decrease switch are examples of existing setters whose set values can be continuously changed, and the set values of the PTO volume and the on / off signals of the pair of switches that can be increased / decreased are existing. This is an example of the input signal input from the setting device.
Further, as an existing setting device, a volume for adjusting the volume of an audio device, a volume for adjusting the angle of a mirror, a slide-type setting device, a seesaw switch, or the like may be used.

Next, in step S150, the PTO required torque set by operating the accelerator pedal (not shown) is calculated and calculated.
Similar to the above-mentioned PTO accelerator volume, the PTO required torque setting by this accelerator pedal should be replaced with the PTO volume described later from the viewpoint of operability, etc., but from the viewpoint of ensuring the diversity of PTO operation, etc. It is also possible to handle PTO operation with the accelerator pedal.

On the other hand, in step S110, it is determined whether or not the special vehicle is stopped.
Whether or not the vehicle is stopped may be determined by a method performed by conventional engine control or the like, and it is not necessary to perform a special process unique to the present invention.

Specifically, for example, a comprehensive judgment is made based on the vehicle speed, the neutral signal, and the output signals of the sensors provided for detecting the operation of the clutch pedal, the brake pedal, and the handbrake (Fig.). See F1 of 1).
The vehicle speed, the neutral signal, and the detection signal for the operation of the clutch pedal, the brake pedal, and the handbrake are input to the electronic control unit 500 from the outside via the interface circuit 6.

If it is determined in step S110 that the vehicle is stopped (YES), the processes of step S130 and step S190 (see FIG. 3) are executed in a time-division manner.

On the other hand, if it is determined in step S110 that the vehicle is not stopped (NO), step S180 (see FIG. 3) is executed.

In step S130, the PTO required torque set by operating the PTO volume is calculated and calculated.
Here, the "PTO volume" is a convenience used in this embodiment in order to distinguish a continuously variable volume (not shown) from the original function when the continuously variable volume (not shown) is used for setting the PTO required torque in the driver's seat. It is a typical name.

The volume is an adjustment setting means for setting the accelerator opening instead of the accelerator pedal. Usually, a mechanical type is used. For example, a knob is provided so as to be rotatable within a predetermined angle range, and the accelerator opening degree can be adjusted by changing the rotation position thereof.

The PTO volume diverted from such a volume can set the PTO required torque to a desired value between 0 and 100% in the above-mentioned rotation range, but it can be increased or decreased in recent years due to the problem of durability. Digitized ones using paired switches are also widespread. For example, by pressing the increase switch once, the PTO required torque is increased by several percent, and by pressing the lower limit switch once, the PTO required torque is decreased by several percent, so that the electronic control unit 500 processes the same function as the volume. To do.

The correlation between the set position of the PTO volume and the PTO required torque with respect to the set position is predetermined, but the correlation and the presence / absence of use are changed according to the usage pattern, that is, for example, a diagnostic tester (not shown). ) Can be used for rewriting. In step S130, the PTO required torque corresponding to the set position of the PTO volume is calculated using a predetermined calculation formula based on the correlation.

Here, the change in the target torque of the PTO and the change in the engine speed with respect to the change in the set value such as the PTO volume and the PTO accelerator volume will be described with reference to FIG.
In FIG. 4, in the characteristic diagram in which the vertical axis is the PTO required torque with respect to the time axis of the horizontal axis, for example, the set value (PTO) when the PTO volume is changed from zero to the maximum value and returned to zero again. An example of the change characteristic of the required torque) is shown.

An example of the change characteristic of the engine speed and the PTO target torque with respect to the change of the PTO required torque is shown above the example of the change characteristic of the PTO required torque.
In response to the above-mentioned change in the PTO volume, the engine speed also increases or decreases substantially as the PTO volume increases or decreases.
Such a change in engine speed is also a change in PTO target torque.
Here, the "PTO target torque" is a target value of torque desired for the operation of special equipment.

When the PTO main switch is turned on and the PTO operation is enabled, the idling speed is set to the PTO in order to compensate for the decrease in the engine speed due to the increase in the engine load due to the operation of the PTO. It is designed to be increased from the normal time when the operation is not enabled. The dotted arrow drawn in the idling region of the characteristic line of the engine speed in FIG. 4 represents this increase in the engine speed.

In FIG. 4, the numerical value representing the engine speed described on the engine speed axis is merely an example and may change depending on the specific specifications of the vehicle and the like.
The changes in the engine speed and the PTO target torque with respect to the setting of the PTO volume and the like described above are not unique to the present invention, and are basically the same as when the conventional PTO dedicated accelerator volume is used.

Next, the processes after step S160 will be described with reference to FIG.
First, in step S180, it is determined whether or not the mobile PTO operation is permitted (see F2 in FIG. 1).
Here, "mobile PTO operation" means a PTO operation performed when a special vehicle is running. This mobile PTO operation is permitted for special vehicles such as road cleaning vehicles and mixer vehicles that require PTO operation while traveling.

Whether or not the mobile PTO operation can be permitted is determined in advance in an appropriate storage area of the electronic control unit 500 when the internal combustion engine drive control device according to the embodiment of the present invention is mounted on a special vehicle, for example, a flag or the like. It is set in the format.
Therefore, in step S180, it is determined whether or not the mobile PTO operation can be permitted based on the stored data as to whether or not the mobile PTO operation stored in the appropriate storage area of the electronic control unit 500 can be permitted.

If it is determined in step S180 that the mobile PTO operation can be permitted (YES), the process proceeds to step S190.
On the other hand, if it is determined in step S180 that the mobile PTO operation cannot be permitted (NO), the process proceeds to step S240.

In step S190, either the result when a YES determination is made in step 180 or the YES determination is made in the previous step S110 (see FIG. 2) is selected.
Next, in step S200, the logical product (AND) of the processing result of step S190, the YES determination result of the previous step S100 (see FIG. 2), and the YES determination result of step S230 is obtained.

That is, when a YES determination is made in either step S180 or step S110, a YES determination is made in step S100, and a YES determination is made in step S230, the logical product is "1".

In step S210, when the logical product of step S200 is "1", it is determined that the PTO operation is valid (see F3 in FIG. 1).
In step S210, if it is determined that the PTO operation is valid (YES), the process proceeds to step S280, while if it is determined that the PTO operation is not valid (NO), the process proceeds to step S240. It will be.

On the other hand, in step S220, if there are a plurality of PTO required torques based on the processing results of steps S130 to S150 described above, the maximum value among them is selected (see F4 in FIG. 1).

After the process of step S220, each process of step S230 and step S270 is executed in a time-division manner.
First, in step S270, conversion from the PTO required torque selected in step S220 to the target torque is performed.
The PTO required torque represents the set amount of the PTO volume, and does not directly represent the torque. The correlation between each PTO required torque and a specific target torque corresponding to this PTO required torque is predetermined, and in step S270, the PTO is calculated by an arithmetic formula set based on such a correlation. The target torque corresponding to the required torque is calculated (see F5 in FIG. 1).

Next, the target torque calculated as described above is output to the fuel injection control process separately executed (see step S280 in FIG. 3 and F6 in FIG. 1).
In executing the process of step S280, it is premised that the PTO operation is determined to be valid in step S210 described above.

Next, a fuel injection request is made to the separately executed fuel injection control process (see step S290 in FIG. 3), and the fuel injection required to achieve the target torque is executed.
Next, the PTO operation lamp (not shown) is turned on (see step S300 in FIG. 3). After the execution of this step S300, the series of processes is temporarily terminated, and the process returns to the main routine (not shown).

On the other hand, in step S230, it is determined whether or not the PTO required torque is zero (see F7 in FIG. 1). The process of step 230 is executed only for the first time after the PTO main switch is turned on and the PTO operation is enabled.

The PTO required torque is automatically reset to zero when the PTO main switch is turned off. Therefore, immediately after the PTO main switch is turned on, the PTO required torque is usually zero.
However, for some reason, if the PTO required torque due to the previous operation or the like is effective immediately after the PTO main switch is turned on, an originally unintended torque may be transmitted to the special equipment for operation.

Therefore, in consideration of the safety of work with special equipment, once all the PTO required torques do not become zero, the PTO required torques are prohibited (see step S240 in FIG. 3 and F8 in FIG. 1). .. The prohibition of the PTO required torque in step S240 is also executed in the same manner when a NO determination is made in any of the previous steps S100, S180, and step S210.

Then, the injection request required for the PTO operation is prohibited, and the engine is in the idling state (see step S250 in FIG. 3). At the same time, the PTO operation lamp (not shown) is turned off, the series of processes is temporarily terminated, and the process returns to the main routine (not shown) (see step S260 in FIG. 3).
By turning off the PTO operation lamp, the operator can recognize that the PTO operation state has been resolved.

Claims (5)

An internal combustion engine drive control device that uses an electronic control unit (500) to perform a power take-off control operation that supplies part of the power of an internal combustion engine to special equipment.
The electronic control unit (500)
Equipped with a PTO required torque adjustment setting unit (50) that adjusts the magnitude of torque required for power take-off.
The PTO required torque adjustment setting unit (50) is
On / off of the cruise main switch that detects the on / off of the PTO main switch based on the on / off signal of the PTO main switch input from the outside, and turns on / off the execution of the constant speed running control input from the outside. When the off of the cruise main switch is detected based on the signal,
The set value input by the existing adjustment setting unit (60) is temporarily set as the set value of the PTO required torque adjustment setting unit (50).
Calculate the target torque according to the set value of the PTO required torque adjustment setting unit (50), and calculate
The fuel injection control that controls the fuel injection to the internal combustion engine is required to execute the fuel injection according to the target torque.
An internal combustion engine drive control device characterized by this. The existing adjustment setting unit (60)
It is a setting device that can continuously change the set value.
The internal combustion engine drive control device according to claim 1. The PTO required torque adjustment setting unit (50) is
The maximum value is selected from the plurality of set values of the PTO required torque adjustment setting means (50).
The internal combustion engine drive control device according to claim 2. The PTO required torque adjustment setting unit (50) is
If the plurality of set values of the PTO required torque adjustment setting means (50) immediately after the PTO main switch is detected to be turned on are not all zero, the plurality of set values of the PTO required torque adjustment setting means (50) are set. The internal combustion engine drive control device according to claim 3, wherein the internal combustion engine drive control device is invalidated. An internal combustion engine drive control device that executes a power take-off control operation that supplies a part of the power of an internal combustion engine to special equipment by an electronic control unit (500), and the electronic control unit (500) is required for the power take-off. An internal combustion engine drive control method in an internal combustion engine drive control device including a PTO required torque adjustment setting unit (50) for adjusting the magnitude of torque.
The first step of detecting the ON of the PTO main switch based on the ON / OFF signal of the PTO main switch input from the outside, and
The second step of detecting the off of the cruise switch based on the on / off signal of the cruise switch for turning on / off the execution of the constant speed running control input from the outside, and
A third step in which the set value input by the existing adjustment setting unit (60) determined in advance is temporarily set as the set value of the PTO required torque adjustment setting unit (50), and
The fourth step of calculating the target torque according to the set value of the PTO required torque adjustment setting unit (50), and
It has a fifth step of requesting the fuel injection control for controlling the fuel injection to the internal combustion engine to execute the fuel injection according to the target torque.
An internal combustion engine drive control method characterized by this.

Images