JPH06137178A - Engine control device and setting method thereof - Google Patents

Abstract

PURPOSE:To both achieve improvement of acceleration and a smooth running feeling of a vehicle by properly setting target acceleration by an accelerator opening in a high frequency of use, in the case of controlling an output characteristic of an engine in accordance with the accelerator opening. CONSTITUTION:Acceleration G of a vehicle of mounting an engine is detected (S2), to obtain a frequency (S4), generating this acceleration G, accumulated, and target acceleration of obtaining 90% this accumulated frequency is set (S6), to change an output characteristic of the engine by adjusting a throttle opening so as to attain the target acceleration when an accelerator opening alphais in a 20 to 30% range with a high frequency of use.

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 a setting method for controlling the output characteristic in accordance with the opening degree (depression amount) of an accelerator pedal. It relates to the ones that are set according to.

[0002]

2. Description of the Related Art Conventionally, as an example of this type of control device, as disclosed in, for example, Japanese Patent Application Laid-Open No. 63-246428, a target acceleration of a driving characteristic of an in-vehicle engine is set in advance, and By detecting the actual driving state,
It is known that they are controlled so as to reach the target acceleration.

[0003]

By the way, in the engine in which the output characteristic is controlled according to the accelerator opening degree, when the target acceleration is set as described above, the acceleration characteristic is set according to the market traffic flow of the vehicle. Considering the setting, when the acceleration is too large, frequent accelerator operation is required to restore the accelerator opening, which hinders the smooth running state of the vehicle. On the contrary, if the acceleration is too small, the feeling of acceleration becomes poor and the driver is dissatisfied.

The present invention has been made in view of the above points. An object of the present invention is to set a target acceleration under a predetermined condition so that the accelerator opening degree is frequently used. The purpose is to set the target acceleration appropriately to achieve both improved acceleration of the vehicle and smooth driving feeling.

[0005]

In order to achieve the above object, in the invention of claim 1 or 2, the frequency of the acceleration of the vehicle is detected, and the acceleration having the predetermined frequency is set as the target acceleration. did.

Specifically, according to the first aspect of the invention, as shown in FIG. 1, the control means 17 for controlling the output characteristic of the engine 1 mounted on the vehicle according to the opening α of the accelerator pedal.
As an engine control device including the acceleration detecting means 18 for detecting the acceleration G of the vehicle, and the acceleration detecting means 1
8, the frequency accumulating means 19 for obtaining and accumulating the frequency of occurrence of the acceleration G for each magnitude of the acceleration G generated when the vehicle is running, and the output of the frequency accumulating means 19.
The target acceleration setting means 20 for setting the target acceleration with which the cumulative frequency becomes a predetermined value, and the output from the target acceleration setting means 20, the target acceleration is achieved when the accelerator opening α is within a range of high usage frequency. Changing means 2 for changing the output characteristic of the engine 1 by the control means 17 as described above
1 and are provided.

On the other hand, in the invention of claim 2, the above-mentioned claim 1
As in the invention described above, as an engine setting method which is mounted on a vehicle and whose output characteristic is controlled according to the opening α of the accelerator pedal, the acceleration G of the vehicle detected by detecting the acceleration G of the vehicle is generated. The frequency at which the acceleration G occurs is calculated for each magnitude, and the calculated frequencies are accumulated to set a target acceleration at which the cumulative frequency becomes a predetermined value, and the accelerator opening α is within a range of high usage frequency. Sometimes, the output characteristic of the engine 1 is changed so that the target acceleration is achieved.

According to a third aspect of the invention, the target acceleration setting means 20 in the engine control apparatus according to the first aspect is set.
Is configured to set a target acceleration having a cumulative frequency of 90%. Further, the changing unit 21 is configured to change the output characteristic of the engine 1 by the control unit 17 so that the target acceleration is achieved when the accelerator opening α is within the range of 20 to 30%.

In the invention of claim 4, the changing means 21 is provided.
Is configured to change the output characteristic of the engine 1 by changing the throttle opening.

[0010]

With the above construction, in the invention of claim 1, the acceleration G of the vehicle equipped with the engine 1 is the acceleration detecting means 18
The frequency accumulating means 19 finds and accumulates the frequency of occurrence of the acceleration G for each magnitude of the acceleration G generated when the vehicle is running, and the target acceleration setting means 20 sets the cumulative frequency to a predetermined value. The target acceleration is set. Then, in the changing means 21, the output characteristic of the engine 1 by the control means 17 is set so that the target acceleration set by the target acceleration setting means 20 is achieved when the accelerator opening α is in a range of high use frequency. Be changed. Also, in the invention of claim 2, the same operation as above is performed. In this way, since the acceleration G having the predetermined cumulative frequency is set as the target acceleration, it is possible to prevent the deterioration of the feeling of acceleration due to the acceleration being too small and the smooth driving of the vehicle due to the acceleration being too large. It can be set to a target value that conforms to.

According to the third aspect of the present invention, the target acceleration is set so that the cumulative frequency of the acceleration G is 90%, and the target acceleration is achieved when the accelerator opening α is within the range of 20 to 30%. Since the output characteristic of the engine 1 is 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.

In other words, looking at the frequency of accelerator operation during general market driving, it is often said that the vehicle has good running performance because the accelerator opening α is often 20 to 30%, and the frequency of high opening is high. Few. On the other hand, in a vehicle with poor traveling performance, the accelerator opening α is often set to a medium or high opening. The acceleration having a cumulative frequency of 100% is the acceleration when the accelerator opening α is fully opened, and the accelerator opening α is 2 when the acceleration is the target opening.
If it is achieved at 0 to 30%, the acceleration obtained at the accelerator opening, which is frequently used, is too large, so that the frequency of accelerator returning operation by the driver becomes high and the drivability deteriorates.
On the other hand, when the acceleration with the cumulative frequency of 80% is set as the target acceleration, if this is achieved with the accelerator opening α of 20 to 30%, the acceleration obtained at the frequently used accelerator opening is not sufficient. Therefore, the driving feeling is poor in the market, and the accelerator operation frequency is high in the middle opening range, and the drivability is also poor. Therefore, the acceleration at which the cumulative frequency is 90% is set as the target acceleration, and this is set as the accelerator opening α
Is set to 20 to 30%, it is possible to effectively prevent the feeling of acceleration from being deteriorated and the vehicle from running smoothly, and it is possible to reliably improve the drivability.

According to the invention of claim 4, the output characteristic of the engine 1 is changed by changing the throttle opening.
The configuration of the changing unit 21 can be specifically and easily obtained.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 4 shows the overall configuration of an embodiment of the present invention, 1 is an engine mounted on a vehicle, 2 is an output shaft 1 of the engine 1.
a An automatic transmission connected to the rear end thereof through a torque converter 3 with a lock-up mechanism. The output shaft of the transmission 2 includes a propeller shaft 4, a differential device 5, and left and right shafts 6, 6 extending in the vehicle front-rear direction. It is drivingly connected to the left and right rear wheels 7, 7 (driving wheels) via the. An electric throttle valve 9 is arranged 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 the engine 1
Is a cooling fan attached to the front end of the output shaft 1a.

The throttle actuator 10 is operated and controlled by a controller 12 for performing lockup control of the torque converter 3 and shift control of the transmission 2. The controller 12 includes a vehicle speed sensor 13 for detecting the traveling speed VSP (vehicle speed) of the vehicle.
Of the accelerator pedal (not shown), the output signal of the accelerator opening sensor 14 for detecting the opening α of the accelerator pedal, and the output signal of the gear position sensor 15 for detecting the gear position Ge of the transmission 2 are at least input. Has been done.

The processing operation for performing the target acceleration correction control in the controller 12 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 larger than 0.02. When this judgment is NO in G≤0.02, the vehicle is considered to be in a steady running state and ends, but when YES in G> 0.02, the routine proceeds to step S4, where acceleration G is stratified by vehicle speed VSP. Separate. For example, FIG. 5 shows the frequency of the acceleration G when the vehicle speed VSP is 0 to 10 km / h, and the acceleration G is 0.02 to 0.02.
When it is 0.1, the frequency is 60%, and 0.1
When it is 0.15, the frequency is 20% and 0.1
When it is 5 to 0.2, the frequency is 10%, and when the above cumulative frequency is 90%, the acceleration G is 0.2.

Next, in step S5, the count value T
Whether or not the acceleration occurrence time exceeds a predetermined value (for example, 10 minutes) is determined by comparing IME with “100”. When this determination is NO in TIME ≦ 100, the value obtained by adding “1” to the count value TIME is counted as a new count value TIME in step S10, and the process is terminated.

On the other hand, when it is judged YES in TIME> 100 in step S5, the process proceeds to steps S6 to S9, and the cumulative frequency 90% acceleration value 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 the cumulative frequency 90% acceleration that changes according to the vehicle speed VSP is set as shown in FIG. . In the next step S7, the throttle opening that achieves the above 90% acceleration is searched from the base map. As shown in FIG. 7, the base map of the throttle opening is based on 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). ) Is set, FIG. 7 (a) shows the gear position Ge at the first speed, FIG. 7 (b) shows the second speed, and FIG. 7 (c) shows the third speed. 7
(D) shows the case of the 4th speed, respectively. Finally, in step S8, as shown in FIG. 8, the line of the throttle opening map itself, which will be 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 shown by a one-dot or two-dot chain line, and the line after rewriting is shown by a solid line. It is also possible to correct the value of the throttle opening map.

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

On the other hand, FIG. 3 shows the processing operation of the throttle control performed by the controller 12.
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, the throttle opening f (α) is obtained from a preset throttle opening map based on the accelerator opening α and the gear position Ge. After that, the process proceeds to step S14, a signal corresponding to the throttle opening f (α) is output to the throttle actuator 10 to drive it, and then the process ends.

In this embodiment, steps S11 to S14 are performed.
Control means for controlling the output characteristic of the engine 1 by driving the throttle actuator 10 according to the accelerator pedal opening α and the gear position Ge of the transmission 2 to change the throttle opening f (α). 17 are configured.

Further, the step S2 constitutes an acceleration detecting means 18 for detecting the acceleration G of the vehicle.

Further, in step S4, a frequency accumulating means 19 is formed which receives the output of the acceleration detecting means 18 and obtains and accumulates the frequency of occurrence of the acceleration G for each predetermined speed VSP of the vehicle.

Further, in step S6, the target acceleration setting means 20 for receiving the output of the frequency accumulating means 19 and setting the target acceleration at which the cumulative frequency becomes 90% is constituted.

Further, in steps S7 and S8, the output of the target acceleration setting means 20 is received so that the target acceleration is achieved when the accelerator opening α is within the range of 20 to 30% which is frequently used. Further, a changing means 21 for changing the output characteristic of the engine 1 by changing the throttle opening characteristic by the control means 17 is configured.

Therefore, in the above embodiment, basically, the accelerator detected by the accelerator opening sensor 14 is based on the throttle opening map set according to 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 the throttle opening f (α).
The throttle actuator 10 is controlled so that

While the vehicle is running, its acceleration G is detected and stratified for each vehicle speed VSP, and the frequency at which the acceleration G occurs is accumulated. The acceleration at which the cumulative frequency is 90% is the target acceleration VSP. It is set according to. 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 in the frequently used range of 20 to 30%. The output characteristic of 1 is changed. In this way, the acceleration at which the cumulative frequency for each vehicle speed VSP becomes 90% is set as the target acceleration, so that deterioration of the feeling of acceleration due to insufficient acceleration and conversely smooth driving of the vehicle due to excessive acceleration can be prevented, and It can be set to a target value that matches the market traffic flow.

In the above embodiment, the output characteristic of the engine 1 is changed by changing the throttle opening characteristic, but this may be performed by the control of another control element.

[0029]

As described above, according to the invention of claim 1 or 2, when the output characteristic of the vehicle-mounted engine is controlled according to the opening degree of the accelerator pedal, the acceleration of the vehicle is detected and the acceleration of the vehicle is detected. The frequency of occurrence is calculated, and the calculated frequency is accumulated to set a target acceleration at which the accumulated frequency becomes a predetermined value, and the target acceleration is achieved when the accelerator opening is in a range of high usage frequency. By changing the output characteristics of the engine in this way, it is possible to prevent the vehicle from running smoothly due to excessive acceleration and to reduce the feeling of acceleration due to excessive acceleration, and to set the target acceleration to match the market traffic flow. You can do it.

According to the third aspect of the present invention, the target acceleration is set so that the cumulative acceleration frequency becomes 90%, and the target acceleration is achieved when the accelerator opening is within the range of 20 to 30%. Since the output characteristic of the engine is changed, the optimum value of the cumulative frequency of acceleration and the optimum value of the accelerator opening degree that is frequently used can be specifically and easily obtained, and the above effects can be effectively exhibited.

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

[Brief description of 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 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 a vehicle.

FIG. 5 is a characteristic diagram showing a 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 with a cumulative frequency of 90%.

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

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

[Explanation of symbols]

 1 engine 9 throttle valve 10 throttle actuator 12 controller 13 vehicle speed sensor 14 accelerator opening sensor 15 gear position sensor 18 acceleration detecting means 19 frequency accumulating means 20 target acceleration setting means 21 changing means VSP vehicle speed α accelerator opening Ge gear position G acceleration

Claims (4)

[Claims] 1. An engine control device comprising control means for controlling output characteristics of an engine mounted on a vehicle according to an opening degree of an accelerator pedal, the acceleration detecting means for detecting acceleration of the vehicle, A frequency accumulating unit that receives the output of the acceleration detecting unit and obtains and accumulates the frequency of occurrence of the acceleration for each magnitude of the acceleration that occurs when the vehicle is running, and the output of the frequency accumulating unit, and the accumulated frequency becomes a predetermined value. Target acceleration setting means for setting a target acceleration, and an output of the engine by the control means for receiving the output of the target acceleration setting means so that the target acceleration is achieved when the accelerator opening is in a range of high usage frequency. An engine control device comprising: a changing unit that changes an output characteristic. 2. A method of setting an engine mounted on a vehicle, the output characteristic of which is controlled according to the opening of an accelerator pedal, wherein the acceleration of the vehicle is detected and the frequency of occurrence of the acceleration generated when the vehicle is running. The target acceleration is calculated by accumulating the calculated frequencies, and the accumulated frequency is set to a predetermined value, and the target acceleration is achieved when the accelerator opening is within a range of high usage frequency. Engine setting method characterized by changing the output characteristics of the engine. 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 degree of 20 to 30. A control device for an engine, wherein the control device is configured to change the output characteristic of the engine by the control means when it is within the range of%. 4. The engine control device according to claim 1, wherein the changing means is configured to change the output characteristic of the engine by changing the throttle opening. apparatus.