JP3164440B2 - Engine control device and setting method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control device and an engine setting method for controlling an output characteristic in accordance with an accelerator pedal opening (depression amount), and more particularly, to an engine control device for controlling an output characteristic of an engine in a market traffic flow of a vehicle. Related to what is set in correspondence with.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of control device, as disclosed in Japanese Patent Application Laid-Open No. 63-246428, for example, a target acceleration of operating characteristics of a vehicle-mounted engine is set in advance, and Detects actual driving conditions,
It is known to control them so as to reach the target acceleration.

[0003]

When the target acceleration is set as described above in an engine whose output characteristic is controlled according to the accelerator opening, the acceleration characteristic is controlled according to the market traffic flow of the vehicle. Considering the setting, when the acceleration is too large, frequent accelerator operation is required to return the accelerator opening, and the smooth running state of the vehicle is hindered. Conversely, if the acceleration is too small, the feeling of acceleration will be poor, causing a problem that the driver will be dissatisfied.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to set a target acceleration under a predetermined condition so that the acceleration at a frequently used accelerator opening can be reduced. It is an object of the present invention to appropriately set the target acceleration so as to achieve both improvement in vehicle acceleration and smooth running feeling.

[0005]

In order to achieve the above object, according to the present invention, the frequency of the acceleration of the vehicle is detected, and the acceleration having the predetermined frequency is set as the target acceleration. did.

More specifically, according to the first aspect of the present invention, as shown in FIG. 1, the control means 17 controls the output characteristics of the engine 1 mounted on the vehicle in accordance with the opening degree α of the accelerator pedal.
An acceleration control means 18 for detecting an acceleration G of a vehicle as an engine control device provided with
8 and the detected acceleration G is lower than in the steady running.
Determining means 19 for determining whether or not the acceleration is large;
By this judging means 19, the acceleration G of the vehicle becomes smaller than the steady running.
When it is determined in even greater acceleration, the frequency distribution unit 20 asking you to frequent occurrence of the acceleration G to each magnitude of the acceleration G generated upon running of the vehicle, the frequency distribution hand
The frequency for each acceleration determined by step 20 is a large frequency
The cumulative frequency means 21 for accumulating in sequence from the cumulative frequency hand
When the output of the stage 21 is received and the cumulative frequency reaches a predetermined value ,
Target acceleration setting means for setting acceleration as a target acceleration
22 and the output of the target acceleration setting means 22 , and changes the output characteristic of the engine 1 by the control means 17 so that the target acceleration is achieved when the accelerator opening α is within a range of high use frequency. And a changing means 23 for performing the operation.

On the other hand, according to the invention of claim 2, the above-mentioned claim 1
Similarly to the invention of the first aspect, as an engine setting method in which the output characteristic is controlled in accordance with the opening degree α of the accelerator pedal, the acceleration G of the vehicle is detected, and the acceleration G generated when the vehicle travels is detected. Is larger than steady driving.
The frequency of occurrence of the acceleration G when indicating the speed is obtained, the obtained frequency is accumulated in order from the largest frequency, and the acceleration when the accumulated frequency reaches a predetermined value is set as the target acceleration . A method is used in which the output characteristics of the engine 1 are changed so that the target acceleration is achieved when the accelerator opening α is within the range of high use frequency.

According to a third aspect of the present invention, there is provided the first aspect of the present invention.
Target acceleration setting means in an engine control device22
Sets a target acceleration with a cumulative frequency of 90%.
To be configured. Also, change means23Is the accelerator opening α
The target acceleration is achieved when it is within the range of 20 to 30%.
The output characteristic of the engine 1 by the control means 17 is
The configuration is changed.

According to a fourth aspect of the present invention, the change means23
The output characteristics of engine 1 can be changed by changing the throttle opening.
Configure to change gender.

[0010]

With the above arrangement, according to the first aspect of the present invention, the acceleration G of the vehicle equipped with the engine 1 is detected by the acceleration detecting means 18.
Detected by the acceleration detecting means 18.
Whether the detected acceleration G is greater than the steady running
Is determined by the determination means 19. And this judgment
By means 19, the acceleration G of the vehicle is larger than the steady running.
When it is determined that there is acceleration, the frequency distribution means 20
In, the frequency of occurrence of the acceleration G to each magnitude of the acceleration G generated during traveling of the vehicle calculated et al is, the cumulative frequency unit 21
In the above, each acceleration obtained by the frequency distribution means 20
From the frequency frequency of each large accumulated in this order, the target acceleration setting unit 22, when the cumulative frequency becomes a predetermined value
The acceleration is set as the target acceleration . The changing means 23 adjusts the output characteristic of the engine 1 by the control means 17 so that the target acceleration set by the target acceleration setting means 22 is achieved when the accelerator opening α is within the range of high use frequency. Be changed. Also, in the invention of the second aspect, the same operation as described above is performed. As described above, the acceleration G when the cumulative frequency reaches the predetermined value is set as the target acceleration. Therefore, it is possible to prevent a deterioration in the feeling of acceleration due to an excessively small acceleration and, conversely, a smooth driving of the vehicle due to an excessively large acceleration. It can be set to a target value suitable for market traffic flow.

According to the third aspect of the present invention, the target acceleration is set such that the cumulative frequency of the acceleration G is 90%, and the target acceleration is achieved when the accelerator opening α is in the range of 20 to 30%. Since the output characteristics of the engine 1 are changed as described above, the optimum value of the cumulative frequency of the acceleration G and the optimum value of the accelerator opening α that is frequently used can be specifically and easily obtained.

That is, looking at the frequency of accelerator operation during driving in a general market, it is often the case that the vehicle is good in driving performance when the accelerator opening α is 20 to 30%, and the frequency of high opening is high. Few. Conversely, in a vehicle with poor traveling performance, the accelerator opening α is frequently set to a medium to high opening. The acceleration at which the cumulative frequency is 100% is the acceleration at the time when the accelerator opening α is fully opened.
If the acceleration is achieved at the time of 0 to 30%, the acceleration obtained at the accelerator opening frequently used is too large, so that the frequency of the accelerator return operation by the driver increases and the drivability deteriorates.
On the other hand, if the acceleration with the cumulative frequency of 80% is set as the target acceleration, if this is achieved at the accelerator opening α of 20 to 30%, the acceleration obtained at the frequently used accelerator opening is not sufficient. Therefore, the driving feeling in the market driving is poor, and the accelerator operation frequency is high in the middle opening range, so that the driving performance also deteriorates. Therefore, the acceleration at which the cumulative frequency becomes 90% is set as the target acceleration, and this is set as the accelerator opening α
Can be effectively prevented from deteriorating the feeling of acceleration and running the vehicle smoothly, and the traveling performance can be reliably improved.

According to the fourth aspect of the invention, the output characteristic of the engine 1 is changed by changing the throttle opening.
The configuration of the changing means 23 can be easily obtained concretely.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows an overall configuration of an embodiment of the present invention, wherein 1 is an engine mounted on a vehicle, and 2 is an output shaft 1 of the engine 1.
a Automatic transmission connected to a rear end via a torque converter 3 with a lock-up mechanism. The output shaft of the transmission 2 includes a propeller shaft 4 extending in the vehicle longitudinal direction, a differential device 5, and left and right shafts 6, 6. It is drivingly connected to the left and right rear wheels 7, 7 (drive wheels) via the same. An electric throttle valve 9 is disposed in an intake passage 8 for supplying intake air to the engine 1, and the throttle valve 9 is driven and controlled by a throttle actuator 10. 11 is engine 1
Is a cooling fan attached to the front end of the output shaft 1a.

The operation of the throttle actuator 10 is controlled by a controller 12 for performing lock-up control of the torque converter 3 and shift control of the transmission 2. The controller 12 has a vehicle speed sensor 13 for detecting a running speed VSP (vehicle speed) of the vehicle.
, An output signal of an accelerator opening sensor 14 for detecting an opening α of an accelerator pedal (not shown), and an output signal of a gear position sensor 15 for detecting a gear position Ge of the transmission 2. Have been.

The processing operation of the controller 12 for performing the target acceleration correction control will be described with reference to FIG. First, in step S1, the vehicle speed VSP detected by the vehicle speed sensor 13 is read, and in step S2, the acceleration G is calculated from the change in the vehicle speed VSP. Next, in step S3, it is determined whether the calculated acceleration G is greater than 0.02. If this determination is NO at G ≦ 0.02, the vehicle is considered to be in a steady running state and the process ends, but if G> 0.02, the process proceeds to step S4, where acceleration G is determined for each vehicle speed VSP. Separate. For example, FIG. 5 shows the frequency of the acceleration G when the vehicle speed VSP is in the range of 0 to 10 km / h.
When it is at 0.1, the frequency is 60%.
When it is at 0.15, the frequency is 20%;
When the frequency is between 5 and 0.2, the frequency is 10%, and when the above cumulative frequency is 90%, the acceleration G is 0.2.

Next, at step S5, the count value T
It is determined whether the acceleration occurrence time exceeds a predetermined value (for example, 10 minutes) by comparing the magnitude of the IME with “100”. If this determination is NO of TIME ≦ 100, the time is counted as a new count value TIME in step S10 by adding “1” to the count value TIME, and the process ends.

On the other hand, if it is determined in step S5 that TIME> 100, the process proceeds to steps S6 to S9, and the value of the cumulative frequency 90% acceleration stratified for each vehicle speed VSP is set as the target acceleration. Specifically, first, in step S6, the acceleration at the cumulative frequency of 90% as described above is stratified for each vehicle speed VSP, and as shown in FIG. 6, a cumulative frequency 90% acceleration that changes according to the vehicle speed VSP is set. . In the next step S7, the throttle opening that achieves the 90% acceleration is searched from the base map. As shown in FIG. 7, the base map of the throttle opening is a throttle opening according to the vehicle speed VSP and the acceleration G for each gear position Ge of the transmission 2 (the throttle opening is indicated by “%” in the figure). 7 (a) shows when the gear position Ge is in the first speed, FIG. 7 (b) shows when the gear position is in the second speed, and FIG. 7 (c) shows the third speed. And Fig. 7
(D) shows the case of the fourth speed. Finally, in step S8, as shown in FIG. 8, the line of the throttle opening map itself described later is rewritten so that the searched throttle opening is achieved at 20 to 30% of the accelerator opening. In FIG. 8, the line before rewriting is indicated by a one-point or two-dot chain line, and the line after rewriting is indicated by a solid line. Further, the value of the throttle opening degree map can be corrected.

Thereafter, in step S9, the count value TIME of the acceleration occurrence time is set to "0", and the process ends.

FIG. 3 shows the processing operation of the throttle control performed by the controller 12. First, FIG.
In step S11, the accelerator opening α detected by the accelerator opening sensor 14 is read, and in step S12, the gear position Ge detected by the gear position sensor 15 is read. Then
In step S13, a throttle opening f (α) is obtained from a preset throttle opening map based on the accelerator opening α and the gear position Ge. Thereafter, the process proceeds to step S14, in which a signal corresponding to the throttle opening f (α) is output to the throttle actuator 10 to drive it, and the process is terminated thereafter.

In this embodiment, the above steps S11 to S14
Control means for driving the throttle actuator 10 in accordance with the opening degree α of the accelerator pedal and the gear position Ge of the transmission 2 to change the throttle opening degree f (α), thereby controlling the output characteristics of the engine 1. 17 are constituted.

Further, the acceleration detecting means 18 for detecting the acceleration G of the vehicle is constituted by step S2.

Further, at step S3 , the output of the acceleration detecting means 18 is received, and the detected acceleration G becomes steady.
Judgment method for judging whether acceleration is greater than running
A stage 19 is configured.

In addition, step S4 allows the determination means
19, the acceleration G of the vehicle is larger than the steady running.
When it is determined that the vehicle is in the right position, as shown in FIG.
For each magnitude of acceleration G generated during running, the acceleration G
Frequency distribution means 20 for determining the frequency of occurrence of
Increase the frequency for each acceleration obtained by the distribution means 20
And an accumulation frequency means 21 for accumulating in order from the lowest frequency .

In step S6, the cumulative frequency
Receiving the output of the means 21, when the cumulative frequency reaches 90%
And a target acceleration setting means 22 for setting the acceleration of the target as the target acceleration.

In steps S7 and S8, the output of the target acceleration setting means 22 is received, and the target acceleration is achieved when the accelerator opening α is within the frequently used range of 20 to 30%. A changing means 23 for changing the output characteristic of the engine 1 by changing the throttle opening degree characteristic by the control means 17 is provided.

Accordingly, in the above-described embodiment, basically, the accelerator opening detected by the accelerator opening sensor 14 is based on the throttle opening map set in accordance with the accelerator opening α and the gear position Ge of the transmission 2. Opening α
And the gear position Ge of the transmission 2 detected by the gear position sensor 15, the throttle opening f (α) is calculated, and the opening of the throttle valve 9 is determined by the throttle opening f (α).
The throttle actuator 10 is controlled such that

[0028] Then, during traveling of the vehicle, the acceleration G is detected G> acceleration G in 0.02 is stratified for each vehicle speed VSP, the order from the frequency frequency of occurrence of the acceleration G is large
The acceleration at which the cumulative frequency becomes 90% is set as the target acceleration according to the vehicle speed VSP. Further, the line of the throttle opening map itself is rewritten so that the cumulative frequency 90% acceleration is achieved when the accelerator opening α is within the frequently used range of 20 to 30%. 1 is changed. As described above, the acceleration at which the cumulative frequency for each vehicle speed VSP becomes 90% is set as the target acceleration. Therefore, it is possible to prevent the deterioration of the feeling of acceleration due to the excessively small acceleration and, conversely, the smooth driving of the vehicle due to the excessively large acceleration. It can be set to a target value suitable for market traffic flow.

In the above-described embodiment, the output characteristics of the engine 1 are changed by changing the throttle opening characteristics, but this may be performed by controlling other control elements.

[0030]

As described above, according to the first or second aspect of the present invention, when controlling the output characteristics of the on-vehicle engine in accordance with the opening degree of the accelerator pedal, the acceleration of the vehicle is detected and the steady-state driving is started. When the acceleration is too large, the car
For each magnitude of acceleration that occurs during both runs,
Frequency for each acceleration, and increase the calculated frequency for each acceleration.
From listening frequency by accumulating sequentially become the cumulative frequency is a predetermined value
Acceleration is set as the target acceleration a time was, by which is adapted to change the output characteristics of the engine such that the target acceleration is achieved when in the range of high accelerator opening frequency of use of the acceleration To prevent the deterioration of the feeling of acceleration due to too small or the smooth driving of the vehicle due to excessive acceleration,
The target acceleration can be set according to the market traffic flow.

According to the third aspect of the present invention, the target acceleration is set such that the cumulative frequency of the acceleration is 90%, and the target acceleration is achieved when the accelerator opening is in the range of 20 to 30%. Since the output characteristics of the engine are changed, the optimum value of the cumulative frequency of acceleration and the optimum value of the accelerator opening frequently used frequently can be specifically and easily obtained, and the above effects can be effectively exerted.

According to the fourth aspect of the present invention, since the output characteristic of the engine is changed by changing the throttle opening, the structure of the changing means can be easily obtained specifically.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of the present invention.

FIG. 2 is a flowchart showing a processing operation for performing correction control of a target acceleration in a controller.

FIG. 3 is a flowchart showing a processing operation for performing throttle control in a controller.

FIG. 4 is a plan view schematically showing a drive system of the vehicle.

FIG. 5 is a characteristic diagram showing the frequency of generated acceleration in a predetermined vehicle speed range.

FIG. 6 is a characteristic diagram showing a relationship between a vehicle speed and a target acceleration value at a cumulative frequency of 90%.

FIG. 7 is a characteristic of a throttle opening map showing a relationship between a throttle opening and a target acceleration at each gear position of the transmission.

FIG. 8 is a characteristic diagram showing a correction characteristic of a throttle opening with respect to an accelerator opening in a throttle opening.

[Explanation of symbols]

Reference Signs List 1 engine 9 throttle valve 10 throttle actuator 12 controller 13 vehicle speed sensor 14 accelerator opening sensor 15 gear position sensor 17 control means 18 acceleration detection means 19 determination means 20 frequency distribution means 21 cumulative frequency means 22 target acceleration setting means 23 changing means VSP vehicle speed α Accelerator opening Ge Gear position G Acceleration

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Claims (4)

(57) [Claims] 1. An engine control device comprising a control means for controlling an output characteristic of an engine mounted on a vehicle in accordance with an opening degree of an accelerator pedal, wherein the acceleration detection means detects an acceleration of the vehicle; receiving the output of the acceleration detecting means, the detected acceleration
The judgment to determine whether the acceleration is higher than that of
The acceleration of the vehicle is larger than the steady running by the determination means and the determination means.
When it is determined in had acceleration, determined how often occurrence of the acceleration for each magnitude of the acceleration generated during vehicle running
Frequency distribution means, and the frequency for each acceleration obtained by the frequency distribution means
A cumulative frequency means for accumulating the high frequency in order to receive the output of the cumulative frequency unit, it cumulative frequency is a predetermined value
Target acceleration setting means for setting the acceleration at the time of the acceleration as a target acceleration, and receiving the output of the target acceleration setting means so that the target acceleration is achieved when the accelerator opening is within a range of high use frequency. A control unit for changing the output characteristics of the engine by the control unit. 2. A mounted on the vehicle, the output characteristics a setting method for an engine is controlled in accordance with the degree of opening of the accelerator pedal, the acceleration by detecting the acceleration of the vehicle, generated during vehicle running
The frequency at which the acceleration occurs when the value indicates an acceleration greater than the steady running is calculated, and the obtained frequency is accumulated in order from the largest frequency, and the acceleration when the accumulated frequency reaches a predetermined value is defined as the target acceleration.
And to set, setting method for an engine and changes the output characteristic of the engine so that the target acceleration is achieved when in the range of high accelerator opening frequency of use. 3. The engine control device according to claim 1, wherein the target acceleration setting means is configured to set a target acceleration having a cumulative frequency of 90%, and the changing means has an accelerator opening of 20 to 30. An engine control device characterized in that the output characteristic of the engine by the control means is changed when it is within the range of%. 4. A control apparatus according to claim 1 or 3, wherein the engine, changing means, control of the engine, characterized in that it is configured to change the output characteristic of the engine by changing the throttle opening apparatus.