JPH0696375B2 - Electronically controlled automatic transmission and engine control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronically controlled automatic transmission and a control device for an engine, and particularly to an automatic transmission, a shift pattern different depending on a driver's request. The present invention relates to an apparatus having a means for selecting the above and having a means for increasing the fuel when the engine is under high load.

(Prior Art) Conventionally, in an electronically controlled automatic transmission, for example, JP-A-58
-187640 publication, as shown in Japanese Patent Publication No. 187640,
A speed change pattern (economy pattern) and a second speed change pattern (power pattern) that prioritizes power performance with the speed change line higher than this are set in advance, and based on the speed change pattern selected by a signal from a changeover switch or the like. It is known that a driver can arbitrarily select a shift pattern by controlling an automatic transmission.

On the other hand, there is known an engine fuel control device provided with a fuel amount increasing means for increasing the amount of fuel in a high load region equal to or higher than a set load to bring the fuel into an enriched state. This fuel increasing means is necessary to improve the output in the high load range.

However, when the fuel amount is increased at the time of high load and the shift pattern of the automatic transmission can be selected as described above, when the vehicle travels according to the first shift pattern, acceleration or climbing is performed. When the engine load is increased on the road, etc., the throttle valve opening tends to be increased to compensate for the difference in power performance compared to when traveling with the second shift pattern, so the engine load can be easily increased to the fuel increase range. Tends to become. If the number of operating states in which the fuel amount is increased increases, the improvement of fuel efficiency is rather hindered. Therefore, it is desired to correct the above tendency in order to improve fuel efficiency. Further, in order to maintain good emission, it is desirable to reduce the operating state in which the fuel amount is increased.

It should be noted that the shift line is set to a relatively low speed side not only in the case of having the first and second shift patterns as described above but also in the shift pattern of the conventional general automatic transmission in order to emphasize the fuel efficiency. On the contrary, the engine load tends to be increased to the fuel increase region, which causes the above problem.

(Object of the Invention) In view of the above circumstances, the present invention prevents a situation in which the engine load is likely to be increased to the fuel increase region in the case of a shift pattern that emphasizes fuel efficiency, and improves fuel efficiency, An electronic control type automatic transmission and an engine control device capable of improving emission are provided.

(Structure of the Invention) The structure of the present invention will be described with reference to the overall structure of FIG.
The device of the present invention is a transmission control means 4 for upshifting or downshifting a shift stage of an automatic transmission based on a shift pattern 3 preset for an automatic transmission 2 and an engine 1, The fuel supply means 5 for supplying fuel according to the operating state of the engine, the load detection means 6 for detecting the load of the engine, and the output of the load detection means 6 are detected to be a preset first load or more. Time,
A fuel increasing means 7 for increasing the fuel supply amount by the fuel supplying means 5 and a shift pattern setting means for setting the shift pattern to a high vehicle speed side when the second load is set to be lower than the first load. 8 and.

With this configuration, when the engine load becomes high, the shift line is changed to the high vehicle speed side before the first load at which the fuel amount increase means 7 increases the fuel amount is reached, thereby improving the power performance. As a result, it is possible to prevent the engine load from being increased to the fuel amount increase range.

(Embodiment) FIG. 2 shows an embodiment of the present invention.
Is an engine, 2 is an automatic transmission, and 10 is a control unit using a microcomputer or the like for comprehensively controlling the engine 1 and the automatic transmission 2. Engine 1 above
A throttle valve 12 and a fuel injection valve 13 are attached to the intake passage 11. The automatic transmission 2 also includes a torque converter 14 connected to the output shaft of the engine 1 and a transmission gear unit 15 connected to the output side of the torque converter 14. This transmission gear unit 15 is
A gear shift mechanism that operates by hydraulic pressure is built in, and a hydraulic actuator 16 that switches the gear position is equipped.

17 is a throttle opening sensor that detects the opening of the throttle valve 12 as load detecting means, 18 is an engine speed sensor that detects the engine speed, and 19 is a turbine speed that detects the speed of the turbine of the automatic transmission 2. Sensors, and detection signals from these sensors are input to the control unit 10. Furthermore, a shift mode signal as a designation signal for selecting an economy mode and a power mode, which will be described later, from a changeover switch operated by the driver.
20 is also input to the control unit 10.

The control unit 10 is composed of a CPU 21, a memory 22 and an input / output port 23, and stores first and second shift patterns and a fuel increase zone, which will be described later, in the memory 22 in advance. Then, while a signal for controlling the fuel supply amount from the fuel injection valve 13 is output, a signal for controlling the hydraulic actuator 16 of the automatic transmission 2 is output via the amplifier 24.
The control unit 10 and the fuel injection valve 13 constitute the fuel supply means 5 described above, and the control unit 10, the amplifier 24, the hydraulic actuator 16 and the like constitute the transmission control means 4, and the control unit 10 further comprises the transmission unit 4. A fuel amount increasing means 7 and a shift pattern setting means 8 are configured.

FIG. 3 shows a preset shift pattern and a fuel increase zone. As the shift pattern, the first shift pattern showing the shift lines Sa ₁ , Sa ₂ , Sa ₃ by solid lines and the shift line by broken lines. The second shift pattern indicating Sb ₁ , Sb ₂ , and Sb ₃ is preset. The first shift pattern is an economy mode pattern that emphasizes fuel efficiency, and the second shift pattern is the second mode.
The speed change pattern is a power mode pattern in which power performance is emphasized. According to the vehicle speed and the throttle opening (engine load), the first speed to the second speed, the second speed to the third speed, and the third speed to the third speed, respectively. Each shifting line Sa _{1 to} Sa ₃ , Sb to 4th speed
_{1 to} Sb ₃ are set, and each shift line Sb _{1 to} Sb _{3 of} the second shift pattern is set to each shift line Sa _{1 to} S of the first shift pattern.
It is set faster than a ₃ . Then, these shift patterns are stored in advance in the memory 22 of the control unit 10 as a map. The apparatus shown in FIG. 2 uses a turbine rotation speed detection signal as a signal corresponding to the vehicle speed, and creates a map of each shift pattern so that the shift position can be obtained according to the turbine rotation speed and the throttle opening. Has been done.

On the other hand, a fuel amount increase zone is preset for the fuel system of the engine 1, and for example, as indicated by the diagonal lines in FIG. 3, the first set opening degree (first load) T ₁ where the throttle opening degree is relatively large.
The above-mentioned high load area and high speed area are defined as fuel increase zones. This fuel increase zone is also stored in advance as a map.
It is stored in 22. Further, in FIG. 3, T ₂ is a second set opening (second load) for changing the shift pattern, and this second set opening T ₂ is set to a value smaller than the first set opening T _1. It is set.

The control operation of the control unit 10 will be described with reference to the flowcharts of FIGS.

FIG. 4 (a) shows a routine for fuel control of the engine,
When this routine starts, the engine speed N and the throttle opening T are read in step S ₁ . In step S _2, by examining the throttle opening T and the like whether or not the first set opening T ₁ or more, it is checked whether fuel increase zone or not. Then, if the fuel increment zone, calculates the fuel according to the engine speed N and the throttle opening T in step S _3, if fuel increase zone, performing the calculation of increasing correction fuel in step S _4. Next, at step S _5, and outputs the fuel control signal in accordance with the calculation result in step S ₃ or step S ₄ to perform injection of fuel, then the process returns.

By this routine, the processing as the fuel supply means 5 and the processing as the fuel increasing means 7 (step S ₄ ) are performed.

Figure 4 (b) shows a routine for controlling the automatic transmission 2, this routine is started, in step S _6, the turbine speed Nt corresponding to the vehicle speed, reads the throttle opening T and the shift mode signal 20 . Then, in step S ₇ ,
Check whether the shift mode signal 20 specifies the power mode.

Then, the processing as the transmission control means 4 (step S ₈ ,
S ₁₀ ) and the processing as the shift pattern setting means 8 (step S ₉ ) are performed. That is, when the power mode is specified (when the determination in step S ₇ is YES)
In step S _8, performs control based on the second shift pattern, i.e. outputs a control signal to perform speed shifting line by the second shift pattern in accordance with the turbine speed Nt and the throttle opening T. Moreover, when the economy mode is designated (when the determination in step S ₇ is NO), in step S _9, checks whether the throttle opening T and the second set opening T ₂ or more. Then, when the determination in step S ₉ is NO, at step S _10, performs a control based on the first shift pattern, i.e. shifting the first shift pattern in accordance with the turbine speed Nt and the throttle opening T While outputting the control signal to perform shifting the line, when the determination in step S ₉ is YES, the step S
By shifting to ₈ , the control is switched to the control based on the second shift pattern.

According to the above control, when the shift mode signal 20 is set to the power mode by the driver's selection, the control based on the second gear shift pattern with emphasis on power performance is performed,
When the shift mode signal 20 is set to the economy mode, the control is basically performed based on the first shift pattern with the emphasis on fuel efficiency performance.

However, even if economy mode is selected,
Second until the throttle opening T reaches the fuel increase zone
When it becomes set opening T ₂ above, by the processing of the shift pattern setting means 8 by the step S _9, is switched from control based on the first shift pattern control based on the second shift pattern. As a result, for example, in FIG.
When the running state corresponding to the point indicated by b is reached, the gear is set to the second
The speed can be changed from the first speed or the third speed to the second speed to enhance the power performance. Therefore, it is less necessary to increase the engine load more than this,
It will be prevented as much as possible from becoming the fuel increase zone.

Although the engine load is detected by the throttle opening in the above embodiment, it may be detected by the intake negative pressure or the like. Also,
As the detection element for speed control, the vehicle speed may be directly detected instead of the turbine speed. Further, the first and second patterns are not necessarily required as the shift pattern as in the above-described embodiment, and even when the shift control is performed based on one shift pattern, the shift pattern is lower than the first load that determines the fuel increase region. The shift position of the shift pattern may be changed to the higher vehicle speed side when the second load is set to be low or higher.

(Effects of the Invention) As described above, the present invention controls the shift based on the preset shift pattern, and shifts the shift pattern to the high vehicle speed side when the second load range is lower than the fuel increase range. Since it is set, it prevents as much as possible the situation where the engine load reaches the fuel increase range due to the driver's operation to improve the power performance, thereby improving fuel efficiency and emission. Is something that can be done.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of the present invention, FIG. 2 is a schematic diagram of an apparatus showing an embodiment of the present invention, FIG. 3 is an explanatory diagram showing preset shift patterns and fuel increase zones, and FIG. a)
(B) is a control flowchart. DESCRIPTION OF SYMBOLS 1 ... Engine, 2 ... Automatic displacer, 3 ... Shift pattern selection means, 4 ... Transmission control means, 5 ... Fuel supply means, 6 ... Load detection means, 7 ... Fuel increase means, 8 ......
Shift pattern setting means.

Claims (1)

[Claims] 1. A transmission control means for shifting up or down a shift stage of an automatic transmission based on a shift pattern preset according to a vehicle speed, and a fuel supply for supplying fuel according to an operating state of an engine. Means, a load detecting means for detecting the load of the engine, and an output of the load detecting means, and when it is detected that the first load or more is set in advance,
A fuel increasing means for increasing the amount of fuel supplied by the fuel supplying means; and a shift pattern setting means for setting the shift pattern to a high vehicle speed side when the second load is set to be lower than the first load. An electronically controlled automatic transmission and an engine control device, which are characterized by being provided.