JPH0465264B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a vehicle running control system that takes measures against malfunctions in a control circuit that occur when engine braking is required.

[Conventional technology]

2. Description of the Related Art A vehicle running control device is known that has a transmission device in which an automatic transmission type sub-transmission is added to a main transmission that changes the gear ratio through a manual transmission operation. A conventional vehicle running control device 1 shown in FIG. 2 includes a one-way clutch 3a in a power transmission path upstream of a main transmission 2 having four speed change gears 21, 22, 23, 24 from low speed to high speed. It has a transmission 4 which is connected in series with an auxiliary transmission 3 in which a low gear with a hydraulic clutch 6 and a high gear with a hydraulic clutch 3b are connected in parallel.
is transmitted to the axle 7 via.

The transmission 4 disengages the foot clutch 6 and shifts to the first gear.
When the speed change gear 21 is selected, the power is transmitted only through the first speed change gear 21 without passing through the sub-transmission 3, and the power is transmitted to the second speed or higher speed change gear 22, 23 and 24, power is always transmitted through the high speed or low speed of the auxiliary transmission 3, so there are seven speed ratios in total. One-way clutch 3 of sub-transmission 3
a transmits power from the engine 5 side to the axle 7 side, but has the function of cutting off power transmission from the axle 7 side to the engine 5 side, and its operation is entirely dependent on the force relationship between the load and the transmitted power. In contrast, the hydraulic clutch 3b is controlled intermittently by commands from a control circuit 8 containing a microcomputer.

As shown in FIG. 3, the control circuit 8 includes an AD connected to a throttle opening sensor 9 that detects the throttle opening varied by an accelerator pedal 9a.
A waveform shaping circuit 12 connected to the converter 10 or the vehicle speed sensor 11, a waveform shaping circuit 14 connected to the engine rotation sensor 13, a battery power source 15, etc. are connected, and are used to grasp the running condition of the vehicle. The necessary information can be collected. A microcomputer (not shown) in the control circuit 8
controls the energization of the solenoid 16 for connecting and disconnecting the hydraulic clutch 3b via an amplifier 17 and a solenoid drive circuit 18 so as to obtain power performance suitable for the driving conditions of the vehicle.

In addition, in this example, the vehicle speed sensor 11 is connected to the axle 7.
It consists of a magnetic disk 11a at the end of the rotation transmission shaft 7a connected to the rotary transmission shaft 7a, and a reed switch 11b that opens and closes by the rotation of the magnetic disk 11a.
Further, the engine rotation sensor 13 uses an ignition coil 13b that is energized by a transistor 13a that is turned on in response to an ignition command.

[Problem that the invention seeks to solve]

The conventional vehicle running control device 1 described above includes a control circuit 8
If the microcomputer inside malfunctions for some reason, the hydraulic clutch 3b inside the auxiliary transmission 3
If the clutch is left in a disengaged state, the sub-transmission 3 will only operate in low gears using the one-way clutch 3a, resulting in the problem that engine braking will no longer be effective.

[Means for solving problems]

This invention solves the above problems, and includes a low speed gear that has a one-way clutch that transmits power only in one direction from the engine to the axle, and a high speed gear that has a clutch that is engaged and engaged by commands from a control circuit. A vehicle running control device having a transmission in which a manual transmission type main transmission is connected in series to an automatic transmission type sub-transmission connected in parallel with the automatic transmission type, wherein the sub-transmission is manually operated to switch the sub-transmission from an automatic mode. A manual switch for switching to manual mode, and a high speed gear selection circuit for connecting the clutch and selecting a high speed gear independently of the control circuit if the vehicle speed is equal to or higher than the creeping speed when the manual switch is operated. The gist of this document is that it has been provided and configured.

[Effect]

This invention provides an auxiliary transmission in which a control circuit automatically switches to a high gear or a low gear depending on the vehicle driving situation, and when the vehicle speed is higher than the creeping speed,
By operating a manual switch, the high speed stage is selected regardless of the output of the control circuit.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIG. FIG. 1 is a circuit diagram showing an embodiment of a vehicle running control device of the present invention. In FIG. 1, the same components as in FIG. 3 are given the same reference numerals.

In FIG. 1, a vehicle running control device 31 is provided with a high speed gear selection circuit 32 for switching the auxiliary transmission 3 to the high speed gear side regardless of the state of the control circuit 8.
This high speed gear selection circuit 32 includes a manual switch 33 that is closed when the sub-transmission 3 is switched from automatic mode to manual mode, and a manual switch 33 that is closed when the vehicle speed exceeds a predetermined speed, for example, a creeping speed. switch 34, or gate circuit 3
5 to one input terminal of a NAND gate circuit 36 between the control circuit 8 and the amplifier 17. The output of the control circuit 8 is supplied to the other input terminal of the NAND gate circuit 36.

Manual switch 33 and speed switch 34
are the high-level voltage application resistor R ₁ ,
It is interposed between the connection point of R ₂ and each input terminal of the OR gate circuit 35 and the ground, and when closed, the corresponding input terminal is set to a low level. The manual switch 33 is also connected to a control circuit 8 that controls the sub-transmission 3, and a closing signal of the manual switch 33 is supplied to the control circuit 8.

Here, when the driver closes the manual switch 33 at a normal running speed that is higher than the creeping speed, the output of the OR gate circuit 35 becomes low level because the vehicle speed switch 34 is also in the closed state. As a result, the output of the NAND gate circuit 36 is
The solenoid drive circuit 18 is supplied with a high level signal via the amplifier 17. Therefore, the solenoid drive circuit 18 de-energizes the solenoid 16, the hydraulic clutch 3b is connected, and the sub-transmission 3 selects the high speed gear.

Therefore, even if the auxiliary transmission 3 selects a low gear in which engine braking is not effective due to malfunction of the microcomputer in the control circuit 8, for example, closing the manual switch 33 will reduce the vehicle speed. Since the high speed gear is always selected when the vehicle exceeds the creeping speed, engine braking can be applied reliably.

In this manner, the vehicle running control device 31 includes a manual switch 33 for the auxiliary transmission 3, which is controlled by the control circuit 8 to automatically switch to a high gear or a low gear depending on the vehicle running condition, so that the vehicle speed can be controlled. When the speed is higher than the creeping speed, the high speed gear is selected by operating the manual switch 33 regardless of the output of the control circuit 8. Therefore, if the control circuit 8 malfunctions, the low gear where the engine brake does not work will be selected. In such a case, by operating the manual switch 33, the high speed gear can be forcibly selected and the engine brake can be reliably applied.

〔Effect of the invention〕

As explained above, according to the present invention, a manual switch is provided for the auxiliary transmission, which is controlled by the control circuit to automatically switch to a high gear or a low gear depending on the vehicle running condition, so that the vehicle speed is equal to or higher than the creep speed. In this case, the configuration is such that the high gear is selected by operating the manual switch regardless of the output of the control circuit, so if a malfunction in the control circuit causes a low gear to be selected in which engine braking is not effective, the manual switch By operating the switch, you can forcibly select a high speed gear and have excellent effects such as being able to reliably apply engine braking.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a vehicle running control device of the present invention, and FIGS. 2 and 3 are a schematic diagram and a circuit diagram showing an example of a conventional vehicle running control device, respectively. 2...Main transmission, 3...Sub-transmission, 3a...One-way clutch, 3b...Hydraulic clutch, 4...Transmission device, 8
...control circuit, 11...vehicle speed sensor, 31...vehicle travel control device, 32...high speed selection circuit, 33...manual switch, 34...vehicle speed switch.

Claims (1)

[Claims] 1. An automatic sub-transmission in which a low speed gear has a one-way clutch that transmits power from the engine to the axle in one direction only, and a high speed gear has a clutch that is engaged and engaged by commands from a control circuit, which are connected in parallel. A vehicle running control device having a transmission in which a manual transmission type main transmission is connected in series, a manual switch that is manually operated to switch the sub-transmission from an automatic mode to a manual mode, and a manual switch that is operated by the manual switch. and a high-speed gear selection circuit that connects the clutch and selects a high-speed gear independently of the control circuit if the vehicle speed is equal to or higher than the creeping speed.