JPH0475431B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-creep control device in a vehicle automatic transmission system having a non-creep mechanism.

In general, for vehicles such as automobiles that employ automatic transmission systems, if the shift lever is placed in the drive D position when the vehicle is stopped (when the engine is idling), the drag torque in the torque converter causes the vehicle to This results in the so-called creep phenomenon in which the

Recently, in this type of automatic transmission system for vehicles, in order to prevent creep, when the engine is idling and the vehicle is stopped, the first gear in the auxiliary transmission of the automatic transmission system is A non-creep mechanism has been developed that controls a so-called drag cut that releases the hydraulic pressure required to establish this.

The present invention provides an automatic transmission system for a vehicle having such a non-creep mechanism, which is capable of performing optimal non-creep control under the control of a control circuit based on a detection signal of the driving state of the vehicle. The present invention provides a non-creep control device for automatic transmission systems for automobiles.

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows an example of the basic configuration of a power transmission system in a vehicle automatic transmission system, in which power output from engine EG via crankshaft 1 is transmitted to torque converter TC, auxiliary transmission TM and actuating device. The power is transmitted to the driving wheels W through DF.

The torque converter TC includes a pump impeller 2 connected to the crankshaft 1, a turbine impeller 3 connected to the input shaft 5 of the auxiliary transmission TM, both impellers 2,
The torque transmitted from the crankshaft 1 to the pump impeller 2 is hydrodynamically transmitted to the turbine impeller 3, and the torque is amplified during that time. When the stator 4 is moved, the stator 4 bears the reaction force.

In addition, in the case of the auxiliary transmission TM, the first speed gear train I,
A second speed gear train and a third speed gear train are provided in parallel. The first speed gear train I includes a drive gear 8 connected to the input shaft 5 via a clutch _C1 serving as a friction engagement element for starting, and a drive gear 8 connected to the output shaft 6 via a one-way clutch _C0 . It is comprised of a driven gear 9 that meshes with the driving gear 8. Also,
The second speed gear train is composed of a driving gear 10 connected to the input shaft 5 via a clutch _C2 , a driven gear 11 connected to the output shaft 6 and meshing with the driving gear 10, and a third speed gear The train is composed of a driving gear 12 connected to the input shaft 5 and a driven gear 13 connected to the output shaft 6 via a clutch _C3 and meshing with the driving gear 12.

In such an auxiliary transmission TM, if only the clutch _C1 is engaged, the drive gear 8 is connected to the input shaft 5, a speed ratio is established by the first gear train, and the speed ratio is established through this gear train. Torque is transmitted from the input shaft 5 to the output shaft 6. Next, clutch C ₁
If clutch C ₂ is engaged while still connected,
The drive gear 10 is connected to the input shaft 5 to establish a speed ratio by the second speed gear train, and torque is transmitted from the input shaft 5 to the output shaft 6 via this gear train.
During that time, the output shaft 6 rotates at a higher speed than the driven gear 9 of the first gear train due to the difference in the gear ratios of the first and second gear trains, so the one-way clutch _C0 is idling. The first speed gear train is substantially brought to rest. In addition, in the connected state of clutch _C1 ,
When clutch C ₂ is disengaged and clutch C ₃ is engaged, the driven gear 13 is connected to the output shaft 6 to establish a speed ratio by the third speed gear train, and the output shaft 6 is transferred from the input shaft 5 to the output shaft 6 via this gear train. Torque is transmitted to. In this case as well, the one-way clutch C ₀ idles to bring the first gear train to rest, similar to when the second gear train is established. The torque transmitted to the output shaft 6 is transmitted to the output gear 14 provided at the end of the output shaft 6.
and is transmitted to the large diameter gear 15 of the differential gear DF.
Note that the reverse gear train and parking mechanism are omitted from the auxiliary transmission TM in FIG. 1.

In addition, Fig. 2 shows the engagement of each clutch C ₁ , C ₂ , C ₃ in the auxiliary transmission TM depending on the running condition of the vehicle.
An example of the configuration of a hydraulic system that controls tripping is shown.

In the configuration shown in the figure, the transmission control device TMC is
In response to the oil pressure sent from the pump P driven by the pump impeller 2 of the torque converter TC, a vehicle speed signal SS1 and a throttle opening signal SS are generated.
By selectively applying hydraulic pressure to each clutch C ₁ , C ₂ , C ₃ according to a preset shift pattern based on 2, the speed of the first to third gears can be adjusted according to the running condition of the vehicle. Have them establish the ratio. Note that this transmission control device TMC itself is the same as a known one, so its details will be omitted.

Further, an oil passage 16 leading from the transmission control device TMC to the clutch _C1 is branched, and a pilot type solenoid valve 18 for a drag cut is provided in the branch passage 17.

In the solenoid valve 18 for the drag cut, when the solenoid 32 is energized during non-creep, the pilot needle 30 is attracted inward against the spring 31 to open the orifice 27, thereby opening the upper oil chamber 21. is the return flow path 20 to tank T.
The interior of the room becomes almost atmospheric pressure, and the oil passage 1
A part of the pressure oil sent into the upper oil chamber 21 from 7 through the orifice 24 is released from the orifice 27 to the reflux path 20. At that time, the spool valve 1
9 rises to a point where it balances with the spring force of the return spring 23, thereby opening the port 26 and communicating the oil passage 17 with the return passage 20, allowing the pressure oil in the oil passage 17 to escape to the tank T with almost no resistance. It will be done. At this time, the movement of the spool valve 19 is effectively regulated by the throttling resistance of the orifice 25, which serves to control the pressure within the clutch _C1 in an extremely stable manner. At this time, the set value of the oil pressure in clutch C ₁ is selected to be approximately equal to or slightly smaller than the set load of the spring that pushes back the piston in clutch C ₁ .
Since the clutch _C1 is placed in a state where there is almost no engagement force, the creep phenomenon of the vehicle is effectively suppressed.

Also, when canceling non-creep, solenoid 32
When deenergized, the pilot needle 30 pops out due to the return force of the spring 31 and closes the orifice 27, stopping pressure oil from escaping from the upper oil chamber 21, thereby reducing the damping effect of the orifices 24 and 25. As a result, the spool valve 19 begins to slowly descend with the return force of the return spring 23, gradually closing the port 26, so the hydraulic pressure slowly rises inside the clutch _C1 , and for a certain period of time, the spool valve 19 starts to descend slowly. The clutch engagement state is restored after the clutch state is reached.

Figure 3 shows solenoid valve 1 for drag cut.
8 shows a non-creep control device for controlling the energization and deenergization of the solenoid 32 according to the driving condition of the vehicle.
A shift position sensor S1 detects whether the engine is in the position, and a water temperature sensor S detects whether the engine coolant temperature has reached a certain level.
2. Vehicle speed sensor S3 that detects the traveling speed of the vehicle;
Each sensor output signal is output from a throttle sensor S4 that detects whether the throttle is in the idle position, a rotation sensor S5 that detects the engine speed, and a brake sensor S6 that detects whether the brake is in operation. A CPU that reads data through the input interface 33, makes a logical judgment as to whether or not a non-creep condition is satisfied, and outputs a control command for turning the drag cut on or off according to the judgment result.
34, and a driver 35 for appropriately deenergizing and energizing the solenoid 32 in the drag cut solenoid valve 18 in accordance with control commands issued from the CPU 34.

With this configuration, CPU3
4 indicates that the shift lever is placed in the D position according to the sensor output signals sent from each sensor S1 to S6, and that the engine coolant temperature is higher than a certain temperature (for example, 65°C). Being there,
The vehicle speed is lower than the preset vehicle speed (e.g. 18 km/h), the throttle is in the idle state, and the engine speed is lower than the preset speed (e.g. 800/1400 rpm). and that the vehicle is in the braking state, and when these conditions are met, it is determined that non-creep is established and the driver 35
A control command for drag cut-on is given to the driver 35, and when even one of these conditions is lacking, it is determined that non-creep is not established, and a control command for drag cut-off is given to the driver 35.

In addition, when the CPU 34 detects that only the brake is released from a state where all the conditions for non-creep are met, the CPU 34 performs a short cycle (60 m
A pulse-like drag cut-off control command with a speed of approximately S) is given to the driver 35, and the solenoid valve 18 is thereby driven in a chopping manner for a certain period of time (approximately 0.6 seconds), and then the non-creep is completely released. ing.

By performing such chipping control when non-creep is released, the shock caused by engagement of clutch _C1 is softened when non-creep is released when the brake is released from a stopped state in non-creep to soft start the vehicle. This will ensure a smooth start.

The present invention relates to such a non-creep control device, and particularly applies the above-mentioned chopping control when canceling the non-creep when the vehicle is started by depressing the accelerator while releasing the brake when starting suddenly or starting on a slope. When this is executed, the engine speed increases during that time and a large shock occurs when clutch _C1 is engaged.
34, when it is detected that the brake is in the operating state and the accelerator is depressed and the engine deviates from the idle state, a control command for drag cut-off that does not involve any stopping is given to the driver 35 to immediately prevent non-creep. I am trying to take steps to remove it.

Therefore, by adopting such a control means, non-creep is canceled even when the brake is in the operating state when the brake is released and the accelerator is depressed to perform a sudden start, start on a slope, etc. Therefore, when the brake is released and the vehicle is started, the vehicle can be started smoothly without causing any shock.

FIG. 4 shows a specific example of the circuit configuration of the non-creep control device. Here, the shift position sensor S1 is a switch that closes the contact when the shift lever is moved to the D position, and the water temperature sensor S2 is a switch that closes the contact when the shift lever is moved to the D position. The throttle sensor S4 closes the contact when the cooling water reaches a certain temperature T _S or higher, the throttle sensor S4 closes the contact when the accelerator pedal is depressed, and the brake sensor S6 closes the contact when the brake pedal is depressed. Each uses a switch that closes the contacts when the In addition, as the vehicle speed sensor S3, for example, a reed switch RY whose contacts turn on and off according to the rotation of a permanent magnet MG attached to the speedometer cable is a rotation sensor S3.
5 is used to pick up the ignition signal sent from the igniter IG to the primary side of the ignition coil IGC, and the CPU 34 counts the number of pulse signals sent from each sensor S3 and S5 for a certain period of time. Vehicle speed,
The engine rotation speed is detected. In addition, the input interface 33 waveform-shapes the output signals of each sensor and then sends the processed signals to the CPU.
It is now being given to 34 people. 36 in the figure is D
A reset circuit is shown that applies a reset signal to the CPU 34 when a reset time set by the time constant of the resistor and capacitor has elapsed after detecting an edge of the position detection signal. In addition, 37 in the figure is a battery drain via the ignition switch.
This is a stabilized power supply circuit to which BATT is connected, and REG in the figure indicates a voltage regulator. Also,
38 in the figure is a reset circuit for the CPU 34 when the power is turned on.

As described above, in the non-creep control device for an automatic transmission system for a vehicle according to the present invention, it is possible to determine whether or not a non-creep condition is satisfied in the control circuit according to sensor output signals sent from various sensors that detect the driving state of the vehicle. In this system, a control command for turning on and off the drag cut is given to the driver of the drag cut valve according to the judgment result, and when the control circuit detects that the brake of the vehicle is released, the drag cut valve is turned off. means for giving the driver a drag cut-off control command that causes the drag cut to be completely released after temporarily driving the vehicle in a chopping manner; This system is designed to provide the driver with a drag cut-off control command that causes the driver to immediately release the drag cut-off when the brake is released. It softens the clutch engagement shock that is established to allow the vehicle to start smoothly, and prevents tipping from occurring when drag cutoff is performed when the accelerator is depressed with the brake applied. This has the excellent advantage of making it possible to smoothly start the vehicle suddenly, start on a slope, etc.

[Brief explanation of the drawing]

Figure 1 is a simplified configuration diagram showing an example of the configuration of a power transmission system in a vehicle automatic transmission system, and Figure 2 is a simplified configuration diagram showing an example configuration of a hydraulic system in a vehicle automatic transmission system with a non-creep mechanism. FIG. 3 is a block diagram showing the basic configuration of a non-creep control device according to an embodiment of the present invention, and FIG. 4 is an electrical wiring diagram showing a specific circuit configuration of the non-creep control device. 18... Solenoid valve for drag cut, 3
0... Pilot needle, 32... Solenoid, 33
...Input interface, 34 ...CPU, 35
...Driver, 39...Bypass circuit, EG...
Engine, TC...torque converter, TM...
Auxiliary transmission, DF... Differential gear, C ₁ to C ₃ ... Clutch, TMC... Hydraulic control device, S1... Shift position sensor, S2... Water temperature sensor, S3...
...Vehicle speed sensor, S4...Throttle sensor, S5
...Rotation sensor, S6...Brake sensor.

Claims (1)

[Claims] 1. The control circuit determines whether or not a non-creep condition is satisfied in accordance with sensor output signals sent from various sensors that detect the driving state of the vehicle,
In this system, a control command for turning on and off the drag cut is given to the driver of the drag cut valve according to the determination result, and the control circuit temporarily turns the drag cut valve off when the release of the vehicle brake is detected. means for giving a drag cut-off control command to a driver to cause the driver to completely release the drag cut after driving the vehicle in a chopping manner; A non-creep control device for an automatic transmission system for a vehicle, characterized in that the non-creep control device is configured to provide a driver with a drag cut-off control command for immediately releasing the drag cut.