JPS6098248A - Control device of car speed changer with sub-speed changer - Google Patents

Abstract

PURPOSE:To prevent surging from occurring by releasing the high-speed hold when a main speed changer is at a high-speed stage and a car speed is predetermined value or more in a speed changer having the main speed changer and a sub-speed changer. CONSTITUTION:A throttle opening signal E1 is generated from a throttle opening detector 19, a car speed signal E2 from a car speed detector 20, and a speed change stage signal E3 from the speed change stage detector 21 of a sub-speed changer. When a car is running at a predetermined speed V0 or less using the fourth speed stage, ''1'' is generated from both the second and third judging circuits 29, 30, and ''1'' is inputted to an OR gate 31 via an AND gate 32. Even if the throttle opening becomes a predetermined opening theta0 or less and ''0'' is generated from the first judging circuit 25, a signal ''1'' is invariably inputted to a NAND gate 26, a signal in response to a comparing circuit 23 is inputted to a solenoid circuit 18a, thus the action of a high-speed transmission system holding unit 24 is released.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a main transmission connected to an engine.
The present invention relates to a control device for a vehicle transmission equipped with an auxiliary transmission, which is formed by connecting auxiliary transmissions each having a two-stage high-low transmission system.

The applicant of this application previously filed a patent application for this type of device in 1788-17
According to No. 6507, a hydraulic clutch is intervened in the high-speed transmission system of the sub-transmission and a one-way clutch that allows over-rotation on the output side is intervened in the low-speed transmission system, and when the hydraulic clutch is released, the low-speed transmission system and the A high-speed transmission system holding system that operates to maintain the hydraulic clutch in a connected state when the throttle opening of the engine is below a predetermined opening, in which the high-speed transmission system is established when the hydraulic clutch is connected. We proposed a system equipped with a device.

Even if you try to apply engine braking by releasing the accelerator pedal, if the low-speed transmission system is established,
Since the one-way clutch allows over-rotation on the output side and engine braking does not work, the driver's intention to apply engine braking is recognized when the throttle opening decreases below the predetermined opening, and the low-speed transmission system This system forcibly establishes the full high-speed transmission system and applies engine braking even when the vehicle is running.

However, with this device, when the main transmission is set to high speed and the auxiliary transmission is running at a relatively low speed due to the low speed transmission system, the high speed transmission system holding device operates to shift the auxiliary transmission to low speed. When the transmission system is switched to a high-speed transmission system, there is an inconvenience that a surging event is likely to occur due to a decrease in engine speed.

The object of the present invention L1 is to provide an improved device of the above proposal which eliminates the above disadvantages. The present invention is characterized in that it is provided with a release device that is activated to release the operation of the high-speed transmission system holding device in the following cases.

Next, the present invention will be explained with reference to the illustrated embodiments.

Referring to FIG. 1, (1) is an engine, (2) is a transmission clutch, (3) is a main transmission connected to the engine (1) via the transmission clutch (2), ( 4) indicates an auxiliary transmission connected in series with the main transmission (3), and the engine (1)
The power from the main and sub transmissions (3) (4) and the differential gear (
5), and the transmission is transmitted to the drive wheels (6) of the vehicle as a whole.

The main transmission (3) includes an input shaft (3a) connected to the shift clutch (2) and an output shaft (3b) connected to the differential gear (5).
) as a transmission gear mechanism, a forward gear train (Gl) (G2) (G3) (G4) and a reverse gear train (GH) are arranged as shown in Fig. 2. The first and second switching clutches (8) and (9) for 1-2nd speed shifting and 3rd-4th speed shifting are linked to the change lever (7) in the vehicle shown in FIG.
It is composed of a manual transmission with four forward speeds and one reverse speed, which is selectively established by the switching operation of the idle foot gear QG for reverse movement, and the transmission gear mechanism has two high and low speeds on the input side or output side. The auxiliary transmission (4) in which the transmission system (GH) (GL)' is biased is connected to increase the number of gears.

To explain this in more detail, in the illustrated case, the human power axis (3a
) is configured to pivotally support a sleeve shaft (b) on the input side of the speed change gear mechanism, and connect the sleeve shaft (6) and the input shaft (3a) via the sub-transmission (4). The high-speed transmission system (GH) is equipped with a hydraulic clutch (b), and the low-speed transmission system (GH) is equipped with a hydraulic clutch (b).
A one-way clutch (2) that allows over-rotation on the output side is intervened in the low-speed transmission system (GL) when the hydraulic clutch 4 is released, and the high-speed transmission system (GL) when the hydraulic clutch 4 is connected. GH), and more specifically, the sleeve shaft (b) and the input shaft (3a)' are extended rearward to the input shaft (3a)' and the extension part thereof is provided with the sleeve shaft (b) and the input shaft (3a)'.
3a), and an interlocking gear Qx fixed to the sleeve shaft (b) before and after the hydraulic clutch (b).
a) and a fixed gear Q4 fixed to the input shaft (3a), and a fixed gear Q4 fixed to the output shaft (3b).
lla) The one-way clutch (b) which pivotally supports the idle gear mechanism (to) which is connected to Q4t, and which allows the output side of the idle gear mechanism (9), that is, the interlocking gear (lla) 111, to over-rotate. , a high-speed transmission system (GH) from the human power shaft (3a) to the sleeve shaft (b) via the hydraulic clutch Q2, and a fixed gear α fat → idle gear mechanism (2) from the input shaft (3a). →Interlocking gear (lla)
A low speed transmission system (GL
), and when the high-speed transmission system (G) is established by the connection of the hydraulic clutch (b), the one-way clutch @ operates to connect the low-speed transmission system (GL)'e. All power transmission is now stopped.

In the illustrated example, the l-speed gear train (GI) and the reverse gear train (OR) are directly connected to the input shaft (3a), and the 2nd to 4th gears are connected directly to the input shaft (3a).
The gear trains (G2), (G3, and G4) are connected to the sleeve shaft (6), and the auxiliary transmission (4) is connected to the gear trains (G2, G3, and G4), and
The gear train for the first gear and the reverse gear (Gt
) (GH) can of course be connected to the sleeve shaft (6) so that eight forward speeds and two reverse speeds can be performed.

The hydraulic clutch @ is connected to a hydraulic pump (as shown in Fig. 2).
The pressure is regulated by a pressure oil regulator valve (incorporated) from (b), and the switching valve (incorporation) interposed in the oil path leading to the hydraulic clutch (6) controls the connection and disconnection of the switching valve. Q19t - Can be freely switched between a refueling position where the hydraulic clutch (2) is refueled and an oil drain position where all oil is drained from the hydraulic clutch (b), and when the hydraulic clutch (b) is switched to the refueling position, the hydraulic clutch (b) is It was connected and released by switching to the oil drain position.

The changeover valve (to) may be constructed in such a manner that a change lever for the auxiliary transmission is provided in the passenger compartment and is linked to this change lever, but in the one shown in the figure, it does not control the load on the engine (1) or the running condition of the vehicle. The configuration is as follows to automatically control the switching 9F(g) based on the throttle opening of the engine (1), the vehicle speed, and the gear position.

That is, depending on the throttle opening WL of the engine (1), the third
Throttle opening signal Flst showing voltage changes as shown
- A throttle opening detector (6) that generates a vehicle speed signal (1h't) that generates a voltage change as shown in the fourth diagram according to the vehicle speed, and a vehicle speed sensor that generates a vehicle speed signal 1h't'' that shows a voltage change as shown in the fourth diagram according to the vehicle speed, and the change lever (7). and a gear position detector (b) which generates a gear position signal Esk which shows a stepwise voltage change as shown in FIG. The throttle opening signal B1 and the gear position signal E3 are added by t operation times W&H to generate a composite signal B4 as shown in FIG. 6, and this is compared with the vehicle speed signal E3 using a comparison circuit.
It is determined whether the voltage of the vehicle speed signal E2 is p higher than the voltage of the composite signal B4, and all logic signals of rlJ or "0" are generated. When the logic signal of the electromagnetic circuit (18a) of the switching valve (g) is input, the switching valve (to) is switched to the oil supply position and the hydraulic clutch (b) is activated. Thus, as shown in FIG. 7, a high-speed transmission system (GH) is established in the high-speed region according to the predetermined characteristic line X2, >J I X4 for each gear stage.

In the illustrated example, the comparison circuit is configured to have a hysteresis characteristic, and the downshift from the high speed transmission system (GH) to the low speed transmission system (GL) is performed according to each of the above characteristic lines ')C.
2g X3 + X4 so that it is performed at a slightly lower speed.

Here, the throttle opening of the engine (1) is a predetermined opening θ
. In the following cases, the hydraulic clutch (B) is held in the connected state by the high-speed transmission system holding device (C). a signal line between the comparator circuit) and the ta circuit (18a); Interposed from nine NAND gates (2), a logic signal of "0" is sent to the discrimination circuit g# when the throttle opening is less than a predetermined opening degree, and a logic signal of "l" when this is more than a predetermined opening degree. The logic signal is input to the NAND gate (E) and the logic signal from the comparator circuit is input to the NAND gate (E).
) into the ND gate.

According to this, the throttle opening degree of the engine (1) is the predetermined opening degree θ. In the above case, the logic signal of 1J is inputted to the NAND gate) from the discrimination circuit #6), and in this case, the logic signal generated from the comparator circuit 4 and the output side of The logic signal input to the electromagnetic circuit (18m) matches, and the hydraulic clutch (b) is controlled to connect and disconnect in accordance with the above characteristics, and the throttle opening of the engine (1) reaches the predetermined opening θ. When the logic signal of "0" is inputted to the gate (2) from the discriminator circuit), regardless of the logic signal generated from the line comparator circuit), the electromagnetic circuit The logic signal rlJ is always input to (18a), and the hydraulic clutch (b) is maintained in the connected state, and in the area below the Y line in FIG.
H) is established.

Although the above is not particularly different from the above-mentioned previous proposal, according to the present invention, when the gear stage of the main transmission (3) is set to a high gear stage, for example, the 4th gear stage, and the vehicle speed is below the predetermined speed vo. This release device is fully provided in the release device which operates to fully release the operation of the high-speed transmission system holding device (c), and will be described in detail. to a second determination circuit that determines whether or not the gear is in the fourth gear from the second determination circuit and generates a logic signal of "l" when the gear is in the fourth gear;
The 34th control determines whether the vehicle speed is below a predetermined speed ■o from the vehicle speed signal E2 and generates a logic signal of "1" when the speed is below a predetermined speed VO! lj separate circuit - and an OR gate 01) interposed in the signal line between the first discriminator circuit) and the NAND gate (e), and the second and third discriminator circuit is connected to the OR gate 0η. The signal from @copper was made to be input via the 'eAND gate■.

According to this, the speed is 4th gear and the predetermined speed v.

When the vehicle is running under
The logic signal [J is input to the OR game (II) through the entire process, and the throttle opening is at the predetermined opening θ. Even if a logic signal of roJ is generated from (to the first discrimination circuit)
A logic signal of "1" is always input to the NAND gate (E) through the OR gate (01)a, and a signal corresponding to the logic signal generated from the comparison circuit is input to the NAND gate (E). , the operation of the high-speed transmission system holding device is canceled. Thus, when driving in the 4th gear, even if the throttle opening becomes less than the predetermined opening 0o, if the vehicle speed is less than the predetermined speed v0, that is, in the region on the low speed side of line 2 in FIG. The operation of the high-speed transmission system holding device (c) is released, and the switching from the low-speed transmission system (GL) to the high-speed transmission system (GH)-z is not performed, so that the predetermined speed Vo'r and the engine accompanying this switching are By setting the vehicle speed to the upper limit at which surging is expected to occur due to a decrease in rotational speed, surging can be prevented from occurring.

In the above embodiment, the release device (E) was configured to prevent the occurrence of surging when traveling in the 4th gear.
Even when driving in gear, if the reduction ratio is relatively small and there is a concern that surging similar to that in 4th gear may occur, use the high-speed transmission system holding device (c) below the specified vehicle speed, which also occurs in 3rd gear. A release device Wt is used to release the operation of the Wt.
- Just configure it.

As described above, according to the present invention, when the main transmission is set to all high-speed gears and the vehicle speed is below a predetermined speed, the release device releases the operation of the high-speed transmission system holding device, and the throttle opening is adjusted to the full predetermined opening. Even if it is decreased below, switching from the low-speed transmission system of the sub-transmission to the high-speed transmission system is not performed, which has the effect of effectively preventing the occurrence of surging.

[Brief explanation of drawings]

FIG. 1 is a diagram of an example of a vehicle transmission to which the present invention is applied;
Fig. 2 is a diagram showing the control circuit of the hydraulic clutch that intervenes in the high-speed transmission system of the sub-transmission, and Figs. 3 to 5 are the throttle opening detector, vehicle speed detector, and gear stage provided in the control circuit. FIG. 6 is a characteristic diagram of a composite signal outputted from an arithmetic circuit provided in the control circuit. FIG. 7 is a diagram showing operating characteristics of a hydraulic clutch. (1)...Engine, (3)...Main transmission, (4)
... Sub-transmission, (GH) ... High-speed transmission system, (GL
)...Low speed transmission system, @...Hydraulic clutch, (b)
・・・One-way clutch, ・・・High-speed transmission system holding device, ２）・・・Release device.

Claims (1)

[Claims] The main transmission connected to the engine has two high and low
A vehicular transmission comprising an auxiliary transmission having a transmission system of two gears, which is fully connected, the auxiliary transmission having a hydraulic clutch in its high-speed transmission system and a one-way clutch that allows over-rotation on the output side in its low-speed transmission system. fully intervenes so that the low-speed transmission system is established when the hydraulic clutch is released and the high-speed transmission system is established when the hydraulic clutch is connected, and when the throttle opening of the engine is below a predetermined opening. is provided with a high-speed transmission system holding device that operates to hold the hydraulic clutch in a connected state, and the holding device operates when the main transmission is in full high speed gear and the vehicle speed is below a predetermined speed. 1. A control device for a transmission for a vehicle with an auxiliary transmission, characterized by being provided with a release device for releasing the operation.