JPH0231612Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hill holder device that prevents a vehicle equipped with an electromagnetic clutch from sliding down when starting on a slope.

[Conventional technology and problems]

Many vehicles with electromagnetic clutches have already been proposed by the applicant, for example, in Japanese Patent Application Laid-Open No. 131430/1983, and clutch current is controlled by engine rotation, accelerator opening, vehicle speed, etc. The clutch is configured to automatically connect and disconnect when the vehicle is stopped. Here, the clutch automatically disengages regardless of the gear position of the transmission when the vehicle speed is below the set speed, including when the vehicle is stopped, so it is necessary to keep the brake pedal depressed or operate the handbrake on slopes. When starting, a clutch current flows to connect the clutch in relation to the engine rotation, so when starting on an uphill slope, the vehicle may begin to move backwards between when the brake pedal is released and when the accelerator is pressed. .

Therefore, in order to prevent such backtracking when starting on a slope, it is possible to generate a creep phenomenon by applying a constant clutch current when the vehicle is stopped, using the same idea as in the case of vehicles equipped with a torque converter. In order to move forward naturally when stopped, the brakes must be applied or the vehicle must be shifted to neutral.

Regarding the prevention of backtracking when starting on a hill,
Conventionally, for example, there is a prior art disclosed in Japanese Unexamined Patent Publication No. 49-4887, in which a brake holding switch is provided on the brake pedal, and a release switch is provided on the accelerator pedal, so that the brake remains in the operating state after the brake is applied until the time of starting. It is proposed to retain. However, this prior art is based on the premise of the creep phenomenon, and it is undesirable from the viewpoint of power consumption and heat generation to constantly flow a constant clutch current to cause the creep phenomenon in an electromagnetic clutch while the vehicle is stopped. Furthermore, since the braking action is immediately released when the accelerator pedal is depressed, when applied to an electromagnetic clutch, the same backtracking problem as in the prior art occurs.

In view of the problems that arise with the unique clutch engagement/disengagement control in vehicles with electromagnetic clutches, the present invention reliably prevents backtracking when starting on a slope depending on the degree of the slope, and also prevents the creep phenomenon on flat ground. It is an object of the present invention to provide a hill holder device for a vehicle equipped with an electromagnetic clutch that prevents this from occurring.

[Means for solving problems]

For this purpose, the present invention focuses on the fact that in an electromagnetic clutch, the clutch torque can be controlled by the clutch current, and the inclination sensor outputs a signal according to the inclination only when stopping on a slope.
The gist of the system is to prevent the vehicle from moving backwards by causing a predetermined clutch current to flow based on this and the gear position signal of the shift bar switch to generate clutch torque.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to an illuminated surface. First, referring to the drawings, the transmission system of a vehicle with an electromagnetic clutch to which the present invention is applied will be described. Reference numeral 1 is an electromagnetic powder clutch, 2 is an engine, and 3 is a continuously variable manual or belt type transmission.

In the electromagnetic powder clutch 1, a drive member 7 having a built-in coil 6 is integrally connected to a crankshaft 4 from an engine 2 via a drive plate 5, and a driven member 9 is connected to an input shaft 8 to a transmission 3. are integrally spline-coupled in the direction of rotation, and these drive and driven members 7 and 9 are closely fitted through a gap 10, and electromagnetic powder is collected from a powder chamber 11 in this gap 10. There is. Further, a slip ring 13 is installed on the drive member 7 via a holder 12 so as to be coaxial with the input shaft 8, and a brush 14 for power supply is in sliding contact with the slip ring 13.

In this way, the drive plate 5 and drive member 7 are rotating together with the crankshaft 4 during engine operation, and when power is supplied to the coil 6 via the brush 14 and slip ring 13 from the control system described later, the drive and driven members 7, 9 are rotated.
Due to the lines of magnetic force generated between them, the electromagnetic particles connected in a chain form in both gaps 10 are accumulated and a bonding force is generated. Due to this bonding force, the driven member 9 is integrated and engaged with the drive member 7,
Engine power from the crankshaft 4 is transmitted to the input shaft 8 .

Also, a control unit 15 is used as a clutch control system.
A circuit is configured on the coil 6 side, and the control unit 15 controls the clutch current and automatically connects the electromagnetic powder clutch 1 when starting, changing gears, and stopping based on signals such as engine rotation, vehicle speed, and throttle opening. I'm starting to cut it off.

Therefore, in the above configuration, an inclination sensor 16 that electrically detects the inclination of a slope is provided, and this sensor 16 is connected to a battery 18 via, for example, a vehicle speed sensor 17 that detects a stop, and the output side of the sensor 16 is connected to a shift lever switch. 19 to the control unit 15.

The inclination sensor 16 has a weight 20 and is rotatably suspended from the lower end of a movable contact 21 which has a resistor 22 on the left and right sides of the lower end of the movable contact 21 for receiving a forward upward signal, and a resistor 2 for obtaining a forward downward signal.
3, and the movable contact 21 is provided with a damper 24 for preventing vibration. The movable contact 21 is connected to the vehicle speed sensor 17 side, and one end of the resistor 22 is connected to the low switch 19a of the shift lever switch 19.
, one end of the resistor 23 is connected to its reverse switch 19b.
are connected to each.

With this configuration, when the vehicle speed sensor 17 is turned on when the vehicle is stopped, power is supplied to the inclination sensor 16. At this time, in the case of a flat ground, the movable contact 21 is positioned vertically and is not in contact with any of the resistors 22, 23, so that no tilt signal is generated and no clutch current flows. On the other hand, in the case of an uphill slope, the movable contact 21
rotates to one side in accordance with the inclination and comes into sliding contact with the resistor 22, thereby outputting a front up signal in accordance with the inclination, which is input to the control unit 15 via the low switch 19a at the low shift position.
Therefore, a clutch current flows through the clutch 1 in accordance with the slope to generate a predetermined clutch torque, so that even when the brake pedal is released, the vehicle is maintained in a stopped state without moving backward. and,
When the accelerator pedal is depressed at the time of starting, the clutch current increases from the above-mentioned value as the engine speed increases, engaging the clutch 1, and quickly starting the vehicle. Furthermore, even when the vehicle is stopped on a downhill slope, it is of course possible to maintain the vehicle stopped in the same manner using the forward downhill signal.

In the above embodiment, the inclination sensor 16 is configured to also obtain a front down signal, but it may also be configured to obtain only a front up signal, or a signal that changes in a stepwise manner depending on the inclination.

[Effect of idea]

As mentioned above, according to the present invention, when a vehicle with an electromagnetic clutch is stopped on a slope, a clutch current flows according to the slope and generates clutch torque, thereby ensuring that the vehicle stops when the brake pedal is released. The condition is maintained, preventing the vehicle from sliding downhill when starting on a slope, improving operational safety. Since the creep phenomenon does not occur on level ground, there is no need for complicated operations like in vehicles equipped with a torque converter. Clutch current is controlled to the minimum necessary, reducing power consumption and
Effects such as being advantageous in terms of clutch heat generation can also be obtained.

[Brief explanation of drawings]

The drawing is a block diagram showing an embodiment of the device according to the present invention. 1... Electromagnetic powder clutch, 15... Control unit, 16... Tilt sensor, 17... Vehicle speed sensor,
19...Shift lever switch.

Claims (1)

[Scope of utility model registration request] In a vehicle equipped with an electromagnetic clutch that automatically connects and disconnects the clutch by controlling the clutch current of the electromagnetic clutch by a control unit, an inclination sensor is provided that outputs a signal according to the inclination of the vehicle only when stopping on a slope. A tilt sensor is configured as a circuit in the control unit via a shift lever switch, and when the shift lever switch is turned on prior to starting from a stop on a hill, a clutch current is caused to flow in accordance with the tilt of the vehicle to generate clutch torque. A hill holder device for vehicles equipped with an electromagnetic clutch.