JPS61238538A - Vehicle running control device - Google Patents

Abstract

PURPOSE:To make possible to forcibly select an auxiliary transmission to a high-speed range when a low-speed range where engine brake is ineffective is selected, by providing a manual switch for switching the auxiliary transmission from an automatic mode to a manual mode by manual operation. CONSTITUTION:A vehicle running control device 31 includes a high-speed range selecting circuit 32 for switching an auxiliary transmission to a high-speed range irrespective of a condition of a control circuit 8. The circuit 32 includes a manual switch 33 adapted to be closed so as to switch the auxiliary transmission from an automatic mode to a manual mode, a vehicle speed switch 34 adapted to be closed when a vehicle speed exceeds a predetermined speed, and an OR gate circuit 35 through which the switches 33 and 34 are connected to one of input terminals of a NAND gate circuit 36 interposed between a control circuit 8 and an amplifier 17. If the control circuit 8 is troubled, and a low-speed range where engine brake is ineffective is selected, the manual switch 33 is operated to forcibly switch the auxiliary transmission to a high- speed range.

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 by a manual transmission operation. The conventional vehicle running control device 1 shown in FIG. 2 has four speed change gears 21 from low speed to high speed.
A sub-transmission 3 in which a low-speed gear having a one-way clutch 3a and a high-speed gear having a hydraulic clutch 3b are connected in series is connected in series to the front stage of the main transmission 2 having 22, 23, and 24. The engine 5 has a transmission 4 with a
The power is transmitted to the axle 7 via the foot clutch 6 and the transmission 4.

When the foot clutch 6 is disengaged and the first gear 21 is selected, the transmission 4 transmits power only through the first gear 21 without passing through the auxiliary transmission 3. The transmission gears 22, 23.2 of second speed or higher
4, power is always transmitted through the high speed or low speed of the sub-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.

The control circuit 8 includes an accelerator pedal 9 as shown in FIG.
an AD converter 10 connected to a throttle opening sensor 9 that detects the throttle opening varied by a. Alternatively, a waveform shaping circuit 12 connected to 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 necessary for grasping the running condition of the vehicle. Information is collected. The microcomputer (shown in the figure) in the control circuit 8 controls the amplifier 17 and the solenoid drive to energize the solenoid 16 for connecting and disconnecting the hydraulic clutch 3b so as to obtain power performance suitable for the driving conditions of the vehicle. Control via circuit 18.

In this example, the vehicle speed sensor 11 includes a magnetic disk 11a at the end of the rotation transmission shaft 7a connected to the axle 7, and a reed switch Ilb 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]

In the above conventional vehicle running control device 1, if the microcomputer in the control circuit 8 malfunctions for some reason,
When the hydraulic clutch 3b in the auxiliary transmission 3 becomes disengaged, the auxiliary transmission 3 uses the one-way clutch 3a.
The problem is that the engine brake is not effective because the engine is only in low gear.

[Means to solve all problems]

This invention solves the above problems, and has 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 the control circuit. Automatically variable sub-transmission with gears connected in parallel.

A vehicle running control device having a transmission in which a manual transmission type main transmission is connected in series, the manual switch being manually operated to switch the sub-transmission from automatic mode to manual mode, and the manual switch being operated. 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. .

[Effect]

The present invention provides an auxiliary transmission in which a control circuit automatically switches between high gear and low gear depending on the driving condition of the vehicle, when the vehicle speed is higher than the creeping speed.

By operating a manual switch, a high speed stage is selected regardless of the output of a 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 sieve gear selection circuit 32 for switching the sub-transmission 3 to a high speed gear regardless of the state of the control circuit 8.

This high speed gear selection circuit 32 has 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. Vehicle speed switch 34
is connected to one input terminal of a Nant gate circuit 36 between the control circuit 8 and the amplifier 170 via an OR gate circuit 35. The output of the control circuit 8 is supplied to the other input terminal of the Nandt gate circuit 36.

The manual switch 33 and the speed switch 34 are interposed between the connection points of the high-level voltage application resistors Rs and R2 and each input terminal of the OR gate circuit 35, respectively, and the ground, and when closed, the corresponding input terminals are set to a low level. shall be. 1, the manual mode switch 33 is also connected to the control circuit 8 that controls the sub-transmission 3, and the closing signal of the manual switch 33 is supplied to the control circuit 8.

Here, when the driver closes the manual switch 33t at a normal running speed that is higher than the creeping speed.

Since the vehicle speed switch 34 is also in the closed state, the output of the OR gate circuit 35 is at a low level. As a result, the output of the Nant gate circuit 36 is set to a high level regardless of the output of the control circuit 8, and a high level signal is supplied to the solenoid drive circuit 18 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 mode.

Therefore, even if the auxiliary transmission 3 selects a low gear with low engine braking due to malfunction of the microcomputer in the control circuit 8, for example, if the manual switch 33 is fully closed, the vehicle speed will slow down. Since the high gear is always selected when the speed is exceeded, it is possible to ensure that engine braking is not applied.

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 changed. 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.
If a low speed gear in which engine braking is not effective is selected due to malfunction of the engine, a high speed gear can be forcibly selected by operating the manual switch 33, 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, and In this case, the configuration is such that the high speed gear is selected by operating the manual switch regardless of the output of the control circuit, so a malfunction in the control circuit causes the low gear to be selected without engine braking.

By operating the manual switch, you can forcibly select a high speed gear and have excellent effects such as being able to apply engine braking to the R4.

[Brief explanation of drawings]

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 running control device, 32 ... High speed stage selection circuit, 3
3...Manual switch, 34...Vehicle speed switch.

Claims (1)

[Claims] An automatic sub-transmission in which a low speed gear that has a one-way clutch that transmits power from the engine to the axle in one direction only and a high speed gear that has a clutch that is engaged and engaged by commands from the control circuit are connected in parallel. , a vehicle running control device having a transmission in which a manual transmission type main transmission is connected in series, the manual switch being manually operated to switch the sub-transmission from an automatic mode to a manual mode; 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.