JPH0613261B2 - Stop control device for gearshift steering device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention uses the hydrostatic mechanical continuously variable transmission mechanism in which the output shaft rotation speed is not limited to the level ground, but uses an accelerator pedal or a brake pedal on an uphill or downhill road. The present invention relates to a vehicle stop control device for a gear shift steering device, which is capable of surely stopping a vehicle without using the vehicle.

[Conventional technology]

A mechanical speed change mechanism consisting of multiple speed stages and a hydraulic pump motor provide a continuously variable speed change mechanism that achieves a continuously variable speed change at each speed stage, and a hydrostatic double differential steering mechanism that performs a steering function using a hydraulic pump motor. The gearshift steering device having
There have been no similar cases in the past, and no inventions or inventions have been announced regarding a vehicle stop (vehicle stop) control device.

[Problems to be solved by the invention]

On the other hand, a vehicle equipped with a continuously variable transmission cannot reliably stop unless an accelerator pedal is used when climbing a hill and a brake pedal is used on a downhill road.

The present invention has been made to eliminate the above-mentioned conventional drawbacks, and can maintain the output shaft rotation speed of a continuously variable transmission at zero, and uses an accelerator pedal or a brake pedal not only on flat ground but also on uphill and downhill roads. An object of the present invention is to provide a vehicle stop control device for a gear shift steering device that can surely stop without a vehicle.

[Means for solving problems]

A vehicle stop control device for a gear shift steering device according to the present invention includes a gear shift section having an gear shift hydraulic pump driven by an engine and a gear shift hydraulic motor driven by oil discharged from the gear shift hydraulic pump, and an output shaft. And a gearshift steering device including a steering unit that selects the transmission unit to a plurality of variable speeds, an output rotation speed of an output shaft of the transmission unit is within a reference rotation speed, an accelerator pedal position signal is within a reference depression amount signal, and Judgment means for judging that the driver is about to stop when the position of the position selection switch for detecting the position of the change lever is at any one of forward, reverse and super-spinning turning, and this judgment means. When the output of the engine is generated, the actual rotation speed of the hydraulic motor for shifting is set to the target speed of the hydraulic motor for shifting calculated based on the engine speed signal so that the output rotational speed of the transmission is zero. It is provided with a control means for focusing the signal.

[Action]

According to the present invention, a gearshift hydraulic pump of a gearshift steering device is driven by an engine, a gearshift hydraulic motor is driven by the gearshift hydraulic pump, and the motor is driven. Is within the reference number of revolutions, the accelerator pedal position signal is within the reference pedal depression amount signal, and the position selection switch is in the forward, reverse, or super turning position, the driver is about to stop. Based on the engine speed, the control means determines that the output speed of the speed change portion becomes zero when the output of the determination means is generated. The hydraulic motor rotation speed signal for the motor is converged.

〔Example〕

An embodiment of a vehicle stop control device for a gear shift steering device according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment. In FIG. 1,
The gearshift steering device 1 has one input shaft 9 connected to the engine 4.
And two (left and right) output shafts 10 and 11, and the transmission unit 2
And steering section 3.

The speed change unit 2 includes a speed change hydraulic pump 5 driven by the engine 4 and a speed change hydraulic motor 6 driven by the discharge oil of the hydraulic pump 5. The output shaft of the hydraulic motor 6 is The mechanically transmitted power from the engine 4 and the power from the hydraulic motor 6 are combined by being connected to the planetary gear train of the speed change unit 2.

In addition, the speed change unit 2 has a plurality of planetary gear trains and a plurality of hydraulically actuated clutches, and by selectively engaging one of the clutches, the speed change unit is set to four speed stages of 1st speed to 4th speed. You can choose. Further, there are two sets of bevel gears and two hydraulically operated clutches for switching between forward and reverse.

The shifting hydraulic pump 5 is a variable displacement pump, and the rotation speed of the shifting hydraulic motor 6 can be controlled by controlling the discharge amount thereof. By controlling the number of revolutions of the hydraulic motor 6, the speed change unit 2 can change the speed continuously at each speed stage.

The steering unit 3 includes a steering hydraulic pump 7 driven by the engine 4 and a steering hydraulic motor 8 driven by the oil discharged from the steering hydraulic pump 7. The output shaft of the hydraulic motor 8 is connected to the planetary gears on the left and right output shafts of the gear shift steering device 1 so as to rotate in the left and right directions, and is combined with the power from the output shaft of the gear shift unit 2. There is.

The steering hydraulic pump 7 is a variable displacement pump, and the steering hydraulic motor 8 is controlled by controlling the discharge amount thereof.
You can control the rotation speed of. When the rotation speed of the steering hydraulic motor 8 is zero, the rotation speeds of the left and right output shafts become the same rotation speed, and the vehicle travels straight. When the rotation of the steering hydraulic motor 8 is forward or reverse. Depending on the rotation speed, a difference occurs between the rotation speeds of the left and right output shafts, and the vehicle can turn right or left.

Reference numeral 12 denotes a shift pump discharge amount control actuator for controlling the discharge amount of the shift hydraulic pump 5.
Reference numeral 3 is a steering pump discharge amount control actuator for controlling the discharge amount of the steering hydraulic pump 7, and the discharge amount is controlled by control signals k and l from the control device 31, respectively. .

On the other hand, 14 is a fuel injection amount control actuator for controlling the fuel injection amount of the engine 4, and controls the fuel injection amount by a control signal m from the control device 31.

Reference numeral 21 denotes an engine rotation speed detector that takes out the engine rotation speed signal N _{E according} to the rotation speed of the engine and sends it to the control device 31. Reference numeral 22 denotes a rotation speed signal N _M of the shifting hydraulic motor 6 depending on the rotation speed of the shifting hydraulic motor 6. And a speed changer output rotation speed detector 23, which extracts the speed changer output rotation speed signal N _{O according} to the speed changer output rotation speed and sends it to the control device 31. , 24
Is a hydraulic motor rotational speed detector for steering to be sent to the control device 31 takes out the rotational speed signal N _N of the hydraulic steering motor 8 by the rotation speed of the hydraulic motor 8 for steering.

The accelerator pedal position detector 25 takes out this signal a and outputs it to the control device 31 according to the accelerator pedal position that controls the rotation speed of the engine 4, and the position selection switch 26 moves the change lever forward and backward. , The four positions of the neutral super-spinning turn are detected, the signals b corresponding to them are taken out and output to the control device 31, and the brake pedal position detector 27 detects the brake pedal position, The signal c is taken out and sent to the control device 31, and the steering wheel angle detector 2
Reference numeral 8 detects the steering wheel turning angle for turning the vehicle, extracts the signal d, and sends it to the control device 31.

Reference numerals 15, 16, 17, and 18 denote first speed clutches that are operated by control signals e, f, g, and h from the control device 31 to engage the hydraulically operated clutches for selecting each speed stage of the transmission unit. The solenoid valve for actuation, the solenoid valve for actuating the second speed clutch, the solenoid valve for actuating the third speed clutch, and the solenoid valve for actuating the fourth speed clutch.

The forward clutch actuating valve solenoid valve 19 and the reverse clutch actuating solenoid valve 20 respectively engage the control device 3 to engage the hydraulically actuating clutch for switching between forward and reverse.
The control signal i, j from 1 activates.

The control device 31 receives the signals a to d and N _E , N _M , N _N , and N _O , and the control signal k is sent to the speed-changing hydraulic pump 5 and the steering hydraulic pump 7 in accordance with the input signals. , L,
The control signal m is sent to the fuel injection amount control actuator 14 of the engine, and the control signals e, f, g and h are sent to the first speed clutch actuating solenoid valve 15 to the fourth speed clutch actuating solenoid valve 18, respectively. The control devices i and j are also sent to the forward clutch actuating solenoid valve 19 and the reverse clutch actuating solenoid valve 20, respectively.

Next, the operation of the shift steering device stop control device of the present invention configured as described above will be described. The vehicle stop control device for a speed change steering device according to the present invention uses the speed change hydraulic pump 5 and the speed change hydraulic motor 6 in the speed change section, and if the rotation speed of the speed change hydraulic motor 6 is not controlled, the vehicle is driven. It cannot be stopped.

The gearshift unit 2 of the gearshift steering device 1 shown in FIG. 1 includes a mechanical four-stage gearshift mechanism, a gearshift hydraulic pump 5, and a gearshift hydraulic motor 6.
According to the above, a static-hydraulic-mechanical continuously variable transmission mechanism is configured so that continuously variable transmission is performed at each speed stage.

In this hydrostatic-mechanical continuously variable transmission mechanism, the ratio of the rotation speed of the speed change hydraulic pump 5 (proportional to the engine speed) to the speed of the speed change hydraulic motor 6, that is, By changing from the negative maximum to the positive maximum, the ratio of the engine speed and the transmission output speed, that is, Can be continuously changed.

FIG. 2 shows the relationship between the hydraulic speed ratio y and the speed ratio x for each forward speed stage. In this FIG. 2, straight line 4
In particular, 1 represents the relationship between the speed ratio x of the first speed and the hydraulic speed ratio y. When attempting to control the vehicle to stop, the vehicle is, of course, in the vehicle speed range on the verge of stopping, that is, within the speed ratio range of the first speed. It can be limited to internal control. Note that basically the same control can be used for the vehicle stop control within the first reverse speed range.

It can be seen from FIG. 2 that the hydraulic speed ratio y must always be held at one point of y = y (0) on the straight line 41 in order to bring the vehicle to a stopped state (vehicle speed zero).

Next, a specific embodiment of the present invention will be described with reference to FIG. The third figure indicate a detailed internal configuration of the control device 31, the transmission unit output speed detector 23 and the shifting unit output speed signal N _O, an accelerator that is output from the accelerator pedal position detector 25 The pedal position signal a and the position signal b output from the position selection switch 26 are input to the stop determination logical product circuit 32.

The output q is output from the vehicle stop judgment AND circuit 32 to the logic circuit 33.
The output N _E of the engine speed detector 21 is also input to the logic circuit 33.

The output N _m of the logic circuit 33 and the output N _{M of the} shift hydraulic motor rotation speed detector 22 are added by an adder 34, and the output ΔN is output to the shift pump discharge amount control actuator 12 through an integrator 35. It is like this.

In FIG. 3, the following criteria are used to determine whether the vehicle is stopped or is about to stop.

(1) The vehicle speed is within a certain reference speed (corresponding transmission output speed signal is _NOC ).

(2) The accelerator pedal position is within a certain reference depression amount (corresponding accelerator pedal position signal is a _C ).

(3) The position of the position selection switch is one of forward, reverse, or super turning.

When all of the above conditions (1), (2), and (3) are satisfied at the same time, the stop control device shall be activated.

A shift unit output speed signal N _O output from the transmission unit output speed detector 23, the position signal b output from the accelerator pedal position signal a and the position selector switch 26, which is outputted from the accelerator pedal position detector 25 , Are input to the vehicle stop judgment AND circuit 32 in the control device 31 as shown in FIG.

In the vehicle stop judgment logical product circuit 32, the conditions (1), (2), and (3) described above, that is, N _O ≤N _OC , a ≤a _C (b = b _F or b = b _R or b = b _st ) (However, b _F : forward position signal, b _R : reverse position signal, b _st : super-spinning position signal) are satisfied at the same time, it is judged that the driver intends to stop the vehicle and signal q Is output.

The signal q is input to the logic circuit 33. It is assumed that the logic circuit 33 operates when the signal q is input. at the same time,
The engine speed signal N _E output from the engine speed detector 21 is input to the logic circuit 33.

In the logic circuit 33, a gearshift hydraulic motor target rotation speed signal N _m for which the speed changer output rotation speed should be zero is calculated based on the engine rotation speed signal N _E. The speed change hydraulic motor target rotation speed signal N _m output from the logic circuit 33 is input to the adder 34.

At the same time, the speed change hydraulic motor rotation speed signal N _M is input to the adder 34 from the speed change hydraulic motor rotation speed detector 22.
The deviation signal ΔN = N _m −N _M is calculated in the adder 34. The deviation signal ΔN output from the adder 34 is integrated by the integrator 35. The control signal k output from the integrator 35 is input to the shift pump discharge amount control actuator 12.

This control signal k is a signal which is feedback-controlled so that the hydraulic speed ratio y of the speed changing hydraulic pump 5 and the speed changing hydraulic motor 6 is set to y (0) in FIG. The speed change hydraulic motor rotation speed signal N _M output from the detector 22 is converged to the speed change hydraulic motor target rotation speed signal N _m . Therefore, the speed ratio x is converged to zero, and the vehicle can be kept stopped. Therefore, the present invention can be applied to a gearshift steering device for a tracked vehicle.

〔The invention's effect〕

As described above, according to the vehicle stop control device for a gear shift steering device of the present invention, the vehicle stop request of the driver is determined based on three of the predetermined reference vehicle speed, reference depression amount, and position selection switch position. As a result, the stopping operation of the vehicle is smoothly performed, and even when the engine speed or the discharge amount of the hydraulic pump for shifting changes while the vehicle is stopped, the speed of the shifting hydraulic motor is always set to the target speed of the shifting hydraulic motor. Since they coincide with each other, the creep phenomenon of the vehicle can be prevented, and as a result, it is possible to reliably stop the vehicle not only on the level ground but also on the uphill road and the downhill road without using the accelerator pedal or the brake petal.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a vehicle stop control device for a gear shift steering device according to the present invention, and FIG. 2 is a hydraulic gear ratio for explaining the operation of the vehicle stop control device for a gear shift steering device. FIG. 3 is a block diagram showing a detailed configuration of a control device in the stop control device for a gear shift steering device, showing a relationship with a speed ratio. DESCRIPTION OF SYMBOLS 1 ... Gearshift steering device, 2 ... Variable transformation part, 3 ... Steering part, 4 ... Engine, 5 ... Gearshift hydraulic pump, 6 ... Gearshift hydraulic motor,
12 ... Speed change pump discharge amount control actuator, 21 ...
... engine speed detector, 22 ... speed change hydraulic motor speed detector, 23 ... speed change section output speed detector, 25 ... accelerator pedal position detector, 26 ... position selection switch, 32 ... stop judgment AND circuit , 33 ... Logic circuit, 34
... adder, 35 ... integrator.

Claims (1)

[Claims] 1. A hydraulic pressure for transmitting an engine output to an output shaft via a plurality of transmissions and applying an output of a hydraulic motor driven by oil discharged from a hydraulic pump driven by the engine output to the output shaft. / In a mechanical continuously variable transmission, an engine speed detector that detects an engine output speed, a transmission speed detector that detects a transmission output speed, and an accelerator pedal position detector that detects an accelerator pedal depression amount. , A position detector for detecting the position of the transmission change lever, and a hydraulic pump discharge amount controller for controlling the discharge amount of the discharged oil are provided, and the output of each of the above detectors is input, and the transmission rotation speed and the accelerator pedal position are set. Is less than or equal to a predetermined value and the transmission change lever position is at a predetermined position, the transmission speed should be set to zero based on the engine speed. Stop control device for a hydraulic / mechanical endless transmission apparatus characterized by comprising providing a control device for outputting to the hydraulic pump discharge rate controller calculates the hydraulic motor target speed.