JPS5829421B2 - Parking is recommended. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an electronically controlled transmission having a parking position at a shift lever position.

The shift lever position of this type of transmission is P for parking position, R for reverse position, N for neutral position,
When the drive range is set to D, the sequence is P-+R → N → D. If you put the shift lever in the P position, start the engine, and then put the shift lever in the forward position,
As mentioned above, the position changes from P-)R-+N to D, and in the R position, the transmission goes into reverse, and there is a problem that the vehicle will back up if the foot brake is not depressed, which causes troublesome driving operations. there were.

The present invention has been made with the above in mind, and even if the shift lever is moved to the D position via the R position and N position after starting the engine in the P position, the clutch will not move to the R position while passing through the R position. It is an object of the present invention to provide a control device for a transmission that prevents gear shifting.

The configuration will be explained below based on the embodiment shown in the drawings.

FIG. 1 is a skeleton of a power shift transmission applied as an embodiment of the present invention, in which 1 is an engine, 2 is a torque converter with a direct coupling clutch 3, and 4 and 5 are for high speed 0 and low speed 0. , 6 is the first clutch, 7 is the second clutch, 8 is the reverse clutch, and 9 is the third clutch, and by selectively operating these, six forward speeds and six reverse speeds can be achieved as shown in Table 1. This allows for a one-speed shift.

Note that the x mark in the table indicates the clutch engaged state.

That is, by engaging the clutch 45 for high speed or low speed and then engaging the clutch 6 for speed 2, forward speed I or speed 2 can be obtained, and the same goes for forward speed 1. IV, V, V
1a is a throttle sensor that detects the output state of the engine, and 2a is a speed sensor that detects the output rotation of the torque converter 2 by the number of pulses.These sensors are used to automatically shift the transmission. used for.

The electro-hydraulic control device for selectively operating each of the clutches 4 to 9 is shown in FIG.
0, 11, 12, 13, and 14 are shift valves of the valley clutch, and SL, SR, Sl, and S2゜S3 are solenoid valves for switching and operating the above shift valves.The operation of these solenoid valves is shown in Fig. 3. This is done by an electronic control circuit shown in Figure 2, which selectively operates the energization state of each speed stage and solenoid.

Its operating status is shown in Table 2. Note that the x mark in the table indicates the energized state of the solenoid.

The electronic control circuit shown in FIG. 3 digitally controls the position of the shift lever, the engine output state from the throttle sensor 1a, and the rotational speed from the speed sensor 2a. A range select circuit 21 consisting of a shift lever position detection switch 16, a neutral ink clock circuit 17, an inverter 18, a bistable latch 19, and a latch release pulse generation circuit 20, a signal from this circuit 21, a signal from the throttle sensor 1a, an automatic shift control circuit 22 that receives a signal from the speed sensor 2a, compares it with an internally set automatic shift point, and sends a signal to the solenoid valve of the valley clutch; a NAND gate 23 that is a runaway prevention circuit; NOR gate 24, which is a logic circuit for performing the operations shown in Tables 1 and 2.
and a power amplifier 25 composed of a switching power transistor that drives a solenoid valve.

Although not shown, it includes a power supply circuit that supplies power to each control circuit, and the power supply circuit is connected to a battery mounted on the vehicle.

The above-mentioned neutral interlock circuit 17 is constructed as shown in FIG. The reset line 28 is connected to the N of the switch 16.
It is connected to the position.

To explain the function of this neutral ink clock circuit 17, first, the shift lever is in P position.

When placed at a position other than N, reset line 2
A neutral detection signal is applied to the switch 8 from the N switch 16.

And t. When the power switch is turned on, the power supply Vcc
is applied, and the potential at point 31 changes as shown in FIG. 5 via capacitor 29 and resistor 30.

This causes a low level signal to be applied to the flip-flop 27 via the set line 26 via the inverter 32 for 12 hours, causing the output of the flip-flop 27 to go high.

This signal becomes low level through the inverter 33 and becomes NA
It is applied to the ND gate circuit 23.

The NAND gate circuit 23 is in an inactive state (gate is closed) when the output signal from the inverter 33 is at a low level.

Therefore, no signal is sent to the subsequent NOR or inverter gate circuit, the solenoid valve does not operate, and the vehicle does not move.

At time t3, when the shift lever is set to the N position and the low level neutral detection signal from the reset line 28 is applied to the flip-flop 27, the flip-flop 27
is reset and the output goes to low level.

Therefore, a high level signal is output from the inverter 33,
As a result, the gate of the NAND gate circuit 23 is opened and becomes operational.

This state is maintained by the flip-flop 27.

Therefore, the vehicle is not ready to travel until the shift lever is set to the N position after the power is turned on.

Next, when the car is parked and the shift lever is in the P position, when you start the engine,
As shown in FIG. 6, the operating state of the power supply Vcc and point 31 is as described above, but the shift lever position detection switch 16
Since the switch in the P position is closed, the potential of the set line 26 remains at a low level.

When the shift lever is moved to the D position to start the car after 14 hours, the switch in the P position is turned off at t4, and the potential of the set line 26 is at a high level, and the R switch is turned on after t5, as shown in Figure 3. The potential of line 34 becomes low level, and the potential of line 35 becomes high level via inverter 18.

After another 16 hours, the R switch is opened, but the bistable latch 19 keeps the line 36 at a high level.

Further, after a time t7, the N switch is closed, and at this time, the R latch is released by a pulse from the latch release pulse generating circuit 20, and the potential of the line 36 becomes a low level.

At this time, the potential of the reset line 28 becomes a low level, the flip-flop 27 is reset, and the vehicle does not start.
After all, the car cannot be started unless it passes through the N position.

When you put the shift lever in the P position without turning on the power and try to move the car forward immediately in this state, the neutral ink clock circuit 17 remains reset in this state.
Therefore, if a P switch is not provided, when the shift lever passes through the R position, the R stage solenoid will operate,
The car has a problem going backwards.

In order to solve this problem, a switch is provided at the P position, and this is connected to the set line 26, which is the set input line of the flip-flop 27. If the shift lever is not moved to the N position and the N switch is not activated, the flip-flop will be activated. 27 will not be reset and the car will not go backwards.

Note that FIG. 7 shows details of the latch release pulse generation circuit 20 described above, where 37 is an OR gate and 38 is a differential pulse generation circuit.

Since the present invention is as described above, even if the engine is started when the shift lever is in the parking position P, the shift lever is moved from the parking position P to the drive position via the R position and the N position. , the R-stage clutch is not activated during this R-position, which facilitates driving operation and improves safety.

[Brief explanation of the drawing]

Figure 1 is a skeleton of a power shift Z continuous shooting system to which the present invention is applied, Figure 2 is a circuit diagram of its electro-hydraulic control device, Figure 3 is an electronic control circuit diagram, and Figure 4 is a neutral ink clock. FIGS. 5 and 6 are detailed diagrams of the circuit. FIG. 7 is a detailed diagram of the latch release pulse generation circuit. 17 is a neutral ink clock circuit, 26 is a set line, 27 is a flip-flop, and 28 is a no set line.

Claims (1)

[Claims] 1 Shift lever position detection switch 16 having parking position P, inverter 18 for inverting a human input signal, bistable latch 19, latch release pulse generation circuit 2
0, and inverters 32 and 33 are connected to the set line 26 and output line of the flip-flop 27, respectively, and the set line 26 of the flip-flop 27 is connected to the set line 26 of the flip-flop 27.
A range select circuit 21 consisting of a neutral ink clock 17 connected to the P position of the shift lever position detection switch 16 and a reset line 28 to the N position, and signals from the signalman throttle sensor 1a etc. from the range select circuit 21. It consists of an automatic shift control circuit 22 which calculates and compares the information with an internally set automatic shift point and sends a signal to the solenoid valve of each clutch, a NAND gate 23 which is a runaway prevention circuit, and a NOR gate 24. A control device for an electronically controlled transmission having a parking position characterized by: