JPH033095B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a control device for an electronic automatic transmission that determines the gear position by taking into consideration the movements of the accelerator pedal when the accelerator pedal is depressed and when it is released. Regarding.

[Prior Art] In a vehicle equipped with an electronic automatic transmission, especially a multi-speed transmission, which uses an electronically controlled actuator to shift and select, a signal corresponding to the amount of accelerator pedal depression and a vehicle speed signal are used. Therefore, the optimum gear stage is detected and the gear change operation is performed automatically.However, in a vehicle equipped with the above-mentioned transmission, the intervals between each shift line are narrow, as shown in the shift map in Figure 3, so it is difficult to drive around curves. For example, while traveling in second gear on a road with many uphill slopes, if you take your foot off the accelerator pedal to coast around a curve, that is, apply engine braking, the car will shift up to third or even fourth gear as shown in the arrow line. If you try to accelerate by pressing the accelerator pedal again, there will be a time lag and the feeling will worsen, or if you try to apply engine braking when the road starts to go downhill, but when you release the accelerator pedal, it will shift up. The problem was that engine braking power could not be obtained.

On the other hand, JP-A-55-129648 discloses an engine load sensor that outputs a load signal corresponding to the engine load, a vehicle speed sensor that outputs a vehicle speed signal corresponding to the vehicle speed, and a shift pattern in which the vehicle speed is set low. and means for setting at least two types of shift patterns, ie, a shift pattern that sets a high shift vehicle speed; means for selecting any one of the shift patterns; and a shift vehicle speed corresponding to the load signal from the selected shift pattern. In the shift control device for an automatic transmission, the shift pattern selection means includes means for generating a shift signal in comparison with a signal, wherein the shift pattern selection means detects a rate of change in engine load, and detects a rate of change in engine load when the engine load is small. The automatic vehicle is characterized in that it is provided with a means for comparing the speed change pattern with a reference value set low when the engine load is high and selecting a speed change pattern set to a high speed change vehicle speed when the engine load change rate exceeds the reference value. Japanese Patent Laid-Open No. 51-44763 discloses a control device for an electronic automatic transmission of a vehicle that detects that the rate of change in engine load has become larger than a predetermined level. a second means for detecting that the vehicle speed has fallen below a predetermined level;
An electronic automatic transmission for an automobile comprising a flip-flop which is set by the detection output of the second means and reset by the detection output of the second means, and a transfer gate for switching the transmission pattern under the control of the output of the flip-flop. Each of the aircraft's control devices is shown, but all of these are designed to prevent the selection of incorrect gear shift patterns, such as for flat ground driving (or city driving) or sudden acceleration (or overtaking), or to correct them. However, the above-mentioned disadvantages regarding the gears cannot be resolved.

Therefore, in order to eliminate the above-mentioned inconvenience, the inventors
A delay time is set before the shift up is executed, and if a brake signal is detected within this time, the shift up is prohibited, and when the brake is released, the prohibition is canceled and the gear position is changed according to the vehicle speed at that time. I suggested the one I chose first.

[Problems to be Solved by the Invention] However, with only the control based on the technology according to the proposal, the actual accelerator pedal depression amount signal does not become zero when the pedal is operated slowly, that is, the pedal does not return (of course, the brake signal does not return to zero). If the shift-up is detected within the range (not fully extended), it is inevitable that the transmission will shift up.

Therefore, it is possible to set a logic that stops optimal gear detection when the amount of change per time in the amount of accelerator pedal depression is large, and prohibits shifting even when the accelerator pedal is being released. When the accelerator pedal is returned by the spring, the speed is very slow compared to the speed at which the accelerator pedal is depressed due to the hysteresis of the spring. If the comparison value of the amount of change in hit is set small, the comparison value will be immediately exceeded at the time of kickdown, and the shift inhibition will be lifted and the shift will begin, resulting in a delayed response and poor feeling.

This response delay does not significantly worsen the feeling as long as engine braking is not applied during upshifts. However, during a downturn, the intervals between the respective shift lines are narrow as described above, so the gears tend to drop rapidly from 4th gear to 3rd gear to 2nd gear as shown by the thick arrow line in Figure 3, but the transmission In this case, it takes a very long time to shift and select using the actuator, and the response delay significantly impairs the feeling.

The present invention aims to solve the above-mentioned problems and allow the vehicle to run with good feeling, and for this purpose, in a vehicle equipped with an electronic automatic transmission, each accelerator pedal is adjusted when the accelerator pedal is depressed and when the accelerator pedal is released. An object of the present invention is to provide a control device for the automatic transmission, which controls speed change in response to the movement of the automatic transmission.

[Means for Solving the Problems] To achieve the above object, the present invention includes a gear position determining circuit that outputs a gear change signal determined based on signals from a vehicle speed sensor and an accelerator pedal sensor; A transmission actuator drive circuit that operates, an analog gate circuit that opens and closes between the two circuits, and a first set value when depressing the accelerator pedal rotation amount, which is smaller than the first set value when returning the accelerator pedal. A circuit is provided which compares it with a second set value and sends a signal to the analog gate circuit to close it when the amount of change is larger than each of the set values.

[Function] When driving in the normal automatic shift range, one output of the accelerator pedal sensor 02 becomes "1" and is output, and the other output is calculated by the calculation circuit 47 to calculate the amount of rotation of the accelerator pedal per time. When the amount of change is depression, the first set value P is less than ₁ ,
When returning, when the second set value _P2 is below, "1" is input from flip-flops 49 ₁ and 49 ₂ described later, and "1" is output from the AND circuit 41 ₂ described later and sent to E of the analog gate circuit 45. The circuit is opened and the gear stage determination circuit 4 is activated based on the signals from the other of the vehicle speed sensor 03 and the accelerator pedal sensor 02.
The gear change signal determined in step 4 is transmitted to the transmission actuator drive circuit 46 and shifted to a predetermined gear.

When you take your foot off the accelerator pedal during coasting, one output of the accelerator pedal sensor 02 becomes "0" and is output, and the other output is calculated by the calculation circuit 47, and the amount of return of the accelerator pedal changes per time. When the amount is larger than the second set value _P2 , the flip-flop ₄₉₂ outputs “0”.
A "0" output is sent to E of the analog gate circuit 45 via the AND circuit 41 ₂ to which the input signal is input, thereby closing the circuit and stopping the transmission to the transmission actuator drive circuit 46.

When the accelerator pedal is depressed again, the amount of change is compared with the first set value, and if it is larger than the first set value, the analog gate circuit 45 is closed as before and no gear change is performed.

[Embodiment] Fig. 1 shows a hydraulic control circuit for gear change operation including a transmission actuator drive circuit, in which 10 is a select actuator, 20 is a shift actuator, 30 is a clutch actuator, and V ₁ ~
_V4 is an on-off valve, _V5 to _V8 are flow path switching valves, P is a pump, T is a tank, 1 to 5, R, and N indicate gear positions, and ON-OFF indicates clutch engagement and disengagement. ing.

Said select and shift actuator 10
and 20 have a configuration that can be stopped at three positions, and step cylinders 13 and 23,
First pistons 11 and 21 and cylindrical second pistons 12 and 2 that fit with the first pistons.
2, the first piston rod 11
a and 21a are engaged with an internal lever of a transmission (not shown). Both actuators 10 and 20 have stepped cylinders 13 and 2.
3, both chambers 13a, 13b and 23a, 23, respectively.
When hydraulic pressure is applied to b, it is in the neutral state shown in the diagram,
When hydraulic pressure acts on the chambers 13a and 23a, the first pistons 11 and 21 move toward the second piston 1.
2 and 22 to the right in the diagram;
Further, when hydraulic pressure is applied to the chambers 13b and 23b, only the first pistons 11 and 21 move to the left in the figure.

The chambers 13a and 13b of the select actuator 10 communicate with the pump P (via the on-off valve _V1 ) or the tank T via flow path switching valves _V5 and _V6 , respectively.

The chambers 23a and 23b of the shift actuator 20 communicate with the pump P (via the on-off valve _V1 ) or the tank via flow path switching valves _V7 and _V8 , respectively.

The clutch actuator 30 is a cylinder 3.
3, a piston 31, and a piston rod 31a whose one end is connected to the piston 31 and whose other end is connected to an actuating lever of a clutch (not shown).
3a communicates with the pump P (via the on-off valve _V1 ) via the on-off valve _V2 , and with the tank T via the on-off valve _V3 and the pulse-controlled on-off valve _V4 . Note that the chamber 33b is piped so as to always communicate with the tank T side.

Reference numeral 50 denotes an electronic control device composed of a microcomputer, which controls the clutch actuator 30.
position sensor 01 that detects the operating position of the accelerator pedal, accelerator sensor 02 that detects the operating position of the accelerator pedal, vehicle speed sensor 03, engine rotation sensor 04, engine coolant temperature sensor 05, gear position that detects the gear position of the transmission. Based on the input signals from the sensor 06, the brake sensor 07, etc., the on-off valves _V1 to _V4 and the flow path switching valve
Controls _V5 to _V8 .

Figure 2 shows accelerator pedal depression (kickdown) in the gear shift operation circuit having the configuration shown in Figure 1.
It is a block diagram for controlling the time and return time.
The same members or the same symbols as in FIG. 1 are shown. In the figure, 03 is a vehicle speed sensor that outputs an output signal corresponding to the vehicle speed, 02 is an accelerator sensor, which consists of two parts, one of which outputs "1" when the accelerator is depressed and output "0" when the accelerator is released, and the other outputs an output signal corresponding to the amount of depression or release of the accelerator pedal. 07 is a brake sensor that detects whether the brake is activated or not, and 44 is the input signal of the other output signal of the accelerator pedal sensor 02 and the output signal of the vehicle speed sensor 03. A gear stage determining circuit that determines the gear shift in the range, 45 is E
When a high level (1) signal is input to (Enable),
An analog gate circuit that transmits or stops the output of the gear position determining circuit 44 to the transmission actuator drive circuit 46;
When the control section is operated, a corresponding actuator is operated to perform a speed change.

Further, 47 is an arithmetic circuit for calculating the amount of change per time in the amount of depression of the accelerator pedal, 48 is a comparison unit, and 49
₁ and 49 ₂ are flip-flops, 40 is a sign discrimination circuit, 41 ₁ and 41 ₂ are AND circuits, 42 is an inverter, and 43 is a circuit for providing a reference value for the amount of depression of the accelerator pedal, which always outputs "0". The comparator 48 is configured so that, when the amount of change per time when the accelerator pedal is depressed is larger than a certain value (P ₁ ), such as during a kickdown, the gear is not shifted during the process of the accelerator pedal depression even if a gear shift signal is received. The first set value _P1 is set to a certain value that causes the accelerator pedal to change, and if the amount of change per time when the accelerator pedal is released is greater than another value ( _P2 ) and smaller than the above _P1 , the shift signal is The second setting value P ₂ is set to another value that prevents gear shifting during the return process of the accelerator pedal, and the value from the calculation circuit 47 is selected by the sign discrimination circuit 40 The above first setting value P ₁
Or compare it with either of the second set value P ₂ ,
When it is larger than the first set value _P1 , it is output to the flip-flop ₄₉₁ , and when it is larger than the second set value _P2 , it is output to the flip-flop ₄₉₂ . The flip-flops 49 ₁ and 49 ₂ are connected to one of their inputs so that the output signal from the comparator 48 is transmitted, and to the other input, a signal indicating that the amount of change in the amount of rotation of the accelerator pedal is "0" per time is transmitted. They are connected to a circuit 43 that provides a reference value so as to be input, and always output "1" when there is no signal from the comparator 48.

Next, the operation of the embodiment of the present invention will be explained.

Since the brake does not operate when driving in the normal automatic transmission range, the "0" output from the brake sensor 07 is inverted by the inverter 42 and becomes "1".
Since the output from one of the accelerator pedal sensors 02 is also input as " ₁ ", it is input to the AND circuit 41 ₁ .
“1” is output from. Also, AND circuit 4
“1” from the AND circuit 41 ₁ is input to 1 ₂ . At the same time, the output from the other side of the accelerator sensor 02 is calculated by the calculation circuit 47, and when the amount of change per time in the amount of rotation of the accelerator pedal is less than the first set value P ₁ at the time of depression, the second set value P ₂ is set at the time of return.
In the following cases, "1" is input from the flip-flops 49 ₁ and 49 ₂ , so "1" is output from the AND circuit 41 ₂ and sent to the E of the analog gate circuit 45 to open the circuit and speed up the vehicle. sensor 03
A signal for changing the gear determined by the gear determining circuit 44 is transmitted to the transmission actuator drive circuit 46 through the analog gate circuit 45 based on the vehicle speed from the vehicle speed and the amount of depression of the accelerator pedal from the other accelerator pedal sensor 02. , and is shifted to a predetermined gear.

When coasting, that is, when you take your foot off the accelerator pedal to apply engine braking, the output from one side of accelerator pedal sensor 02 is "0".
Therefore, this output is the AND circuit 41 ₁ , 41 ₂
The signal is then sent to the analog gate circuit 45, which closes the gate and stops signal transmission from the gear position determination circuit 44 to the transmission actuator drive circuit 46.

Further, when the brake is depressed, the output "1" of the brake sensor 07 is inverted by the inverter 42 and inputted to the AND circuit ₄₁₁ as a "0" output, so that the same operation as described above is performed.

When the foot is released from the accelerator pedal, one of the accelerator pedal sensors 02 becomes “0”.
At the same time, the other output is calculated by the calculation circuit 47, and when the amount of change per time in the amount of return of the accelerator pedal is larger than the second set value _P2 , a "0" signal is output from the flip-flop ₄₉₂ . It sends a "0" output to E of the analog gate circuit 45 via the AND circuit 41 ₂ , closing the circuit and stopping the transmission to the transmission actuator drive circuit 46.

When the accelerator pedal is depressed again, the amount of change is compared with the first set value _P1 , and if it is larger than the first set value _P1 , the same effect as described above is performed. become.

[Effects of the Invention] As explained in detail above, the present invention includes a gear speed vehicle speed circuit that outputs a gear change signal determined based on signals from a vehicle speed sensor and an accelerator pedal sensor, and a transmission actuator drive that is operated by the signal. circuit, an analog gate circuit that opens and closes between the above two circuits, and a first set value when depressing the accelerator pedal rotation amount per time, and a second set value smaller than the first set value when returning the accelerator pedal. In comparison, since a circuit is provided that sends a signal to the analog gate circuit to close it when the amount of change is larger than each set value, shifting is prohibited during the return of the accelerator pedal as in the conventional case. By setting only a small comparison value for the amount of change in accelerator pedal depression, the time lag in gear shifting due to unnecessary kick-down when the accelerator pedal is depressed is prevented, and this results in quick response and good performance that does not impair the driving feeling. Furthermore, when the accelerator pedal is released, the gear shift can be controlled accurately according to the condition, and a good feeling can be obtained. In particular, it is effective in preventing inconveniences such as insufficient brake power during coasting and delayed acceleration after coasting.

[Brief explanation of drawings]

Fig. 1 is a hydraulic control circuit diagram for operating the transmission, Fig. 2 is a circuit diagram expressed as a block diagram, and Fig. 3 is a vehicle speed map. 03: Vehicle speed sensor, 02: Pedal sensor, 0
7: Brake sensor, 44: Gear stage determination circuit, 4
5: Analog gate circuit, 46: Transmission actuator drive circuit, 47: Arithmetic circuit, 48: Comparison section, 49 ₁ , 49 ₂ : Flip-flop, 40: Sign discrimination circuit, 41 ₁ , 41 ₂ : AND circuit.

Claims (1)

[Claims] 1. A gear position determining circuit that outputs a gear change signal determined based on signals from a vehicle speed sensor and an accelerator pedal sensor, a transmission actuator drive circuit that operates based on the signal, and an analog gate circuit that opens and closes between the two circuits. The amount of change per time in the amount of rotation of the accelerator pedal is compared with a first set value when the accelerator pedal is depressed and with a second set value that is smaller than the first set value when it is released, and when the amount of change is greater than each of the set values. A control device for an electronic automatic transmission, comprising a circuit for sending a signal to close the analog gate circuit.