JPH0224684B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a burnout prevention warning device for an input clutch of an automatic transmission transmission of a motor vehicle with an automatic transmission.

[Prior Art] Fig. 1 is a schematic diagram showing an example of a planetary gear unit of a known three-speed automatic transmission, and the planetary gear unit of the automatic transmission includes a torque converter 10, a planetary gear transmission mechanism with three forward speeds and one reverse speed. ,
That is, it is equipped with a transmission 30 and is controlled by a hydraulic control device.
The torque converter 10 includes a pump 55 and a turbine 5.
6 and a stator 57,
Pump 55 is connected to an engine crankshaft 58, and turbine 56 is connected to a turbine shaft 59.
The turbine shaft 59 constitutes the output shaft of the torque converter 10, and also serves as the input shaft 23 of the planetary gear transmission mechanism 30 with three forward stages and one reverse stage. A multi-plate clutch 24 for transmission input is provided between the input shaft 23 and the intermediate shaft 29.
The clutch 24 is a forward input clutch that is engaged when shifting from N to D, and a multi-plate clutch 25 is provided between the input shaft 23 and the sun gear shaft 80, and the clutch 25 is used to shift the transmission from N to D.
This is a reverse input clutch that is engaged during R shift. Multi-disc brakes 26, 40 and a one-way clutch 41 are provided between the sun gear shaft 80 and the transmission case 68. The sun gear 82 provided on the sun gear shaft includes a carrier 83 and a planetary pinion 8 supported by the carrier.
4. The ring gear 85 meshing with the pinion, another ring gear 86, the planetary pinion 87 supported by the carrier, and the ring gear 88 meshing with the pinion constitute a two-row planetary gear system. The ring gear 85 is the intermediate shaft 29
is connected to. Further, the carrier 83 in this planetary gear device is connected to a ring gear 88 in the other planetary gear device, and these carrier and ring gear are connected to an output shaft 89. Further, a multi-disc brake 27 and a one-way clutch 28 are provided between the carrier 86 and the transmission case 68 in the other planetary gear set.

The planetary gear unit of an automatic transmission uses a hydraulic control device to engage or release each clutch and brake according to the engine output and vehicle speed, and shifts to three forward gears or one reverse gear by manual switching. It's becoming like that.

In automatic transmissions, N→D shift or N→
During the R shift, hydraulic pressure is supplied from the hydraulic control device to the hydraulic servo of the forward or reverse clutch of the transmission, and the forward input clutch 24 and reverse input shaft in the planetary gear unit described above and shown in FIG. Input clutches such as the clutch 25 are engaged, and conventionally, the engagement oil passages of these input clutches are equipped with check valves for flow control in order to relieve the shift shock during N→D shift or N→R shift. A valve or an accumulator is installed to control the engagement hydraulic pressure so that the hydraulic pressure applied to the hydraulic servo of the input clutch acts slowly, that is, to lengthen the engagement time of the input clutch.

However, in the above configuration, in the idling state (transmission input is high rotation), N→
With a D shift, the engagement time of the input clutch is longer when the transmission input is at high revolutions as compared to low revolutions because the engagement torque of the input clutch is greater. As a result, the input clutch may burn out and its durability becomes a problem.

[Problems to be Solved by the Invention] Therefore, the present invention provides a transmission that issues a warning signal to the driver when there is a risk of burning out the input clutch due to driving operation, thereby preventing the input clutch from being burnt out. The purpose of the present invention is to provide a warning device for preventing burnout of an input clutch.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides vehicle speed detection means for detecting the vehicle speed of an automobile, throttle opening detection means for detecting the throttle opening degree, and shift lever selection. A transmission input clutch comprising a shift position detecting means for detecting a position, and a warning device for inputting signals from the vehicle speed detecting means, the throttle opening detecting means and the shift position detecting means and issuing a warning signal. In the burnout prevention warning device, the vehicle speed detection means has a first circuit that outputs a signal when the vehicle speed is below a predetermined value, and the throttle opening detection means outputs a signal when the throttle opening is above a predetermined value. The shift position detecting means has a third circuit that emits a signal for a predetermined time when the shift lever is operated from the neutral position to the forward position or from the neutral position to the reverse position, The warning device has a structure that issues a warning signal when signals from the first circuit, second circuit, and third circuit are input.

[Operations and Effects] The present invention has a first circuit that outputs a signal when the vehicle speed is below a predetermined value, a second circuit that outputs a signal when the throttle opening is above a predetermined value, and a second circuit that outputs a signal when the throttle opening is above a predetermined value. A third part that emits a signal for a predetermined period of time when the vehicle is operated from the forward position or neutral position to the reverse position.
The warning device has a circuit including the first circuit, the second circuit, and the warning device.
Since the structure is such that a warning signal is issued when a signal is input from the circuit and the third circuit, for example, when the shift lever is moved from the neutral position to the forward position or from the neutral position to the reverse position while the vehicle is running at a predetermined speed or less or while the vehicle is stopped, position, and the throttle opening exceeds a predetermined value within a predetermined time, and a warning is issued if there is a risk of excessive wear and burnout of the input clutch, which has the effect of preventing burnout of the input clutch. have

[Example] Next, the present invention will be explained based on an example shown in the drawings. FIG. 2 is a block diagram showing the structure of an embodiment of the burnout prevention warning device for the input clutch of the transmission according to the present invention.

Reference numeral 100 indicates throttle opening detection means, that is, a throttle opening detection device that detects and outputs a state in which the throttle opening exceeds a set value. Reference numeral 200 indicates a shift detection means, that is, detects and outputs N→D shift and N→R shift. 300 is a vehicle speed detecting means, that is, a vehicle speed detecting device that detects and outputs a state in which the vehicle speed is below a predetermined value, and 400 is a warning means, that is, a warning circuit.

The throttle opening detection device includes a resistor 101, a throttle opening sensor 102, and an inverter 103, and when the throttle opening exceeds a predetermined value a (10% in this embodiment), the throttle opening is connected to a circuit A via the inverter 103. The output to changes to high level.

The shift detection device 200 includes a shift position sensor 201, an N→D, N→R detection circuit 202, and a monostable multivibrator 203, and a shift position change is input from the shift position sensor 201 to the detection circuit 202. Then N→D, N→
In the case of R, a high level output is sent to the monostable multivibrator 203, and the multivibrator 2
03 to circuit B within a predetermined time (in this example, 0.6
seconds) pulse signal is output.

The vehicle speed detection means 300 includes a vehicle speed detector 303 consisting of a gear 301 provided on an output shaft and a rotation speed voltage converter 302, and a reference vehicle speed signal generator 304.
and a comparator 305, which includes a voltage Vs1 that increases according to the vehicle speed output from the vehicle speed detector 303 and a predetermined reference voltage Vs2 output from the reference vehicle speed signal generator 304 (corresponding to 5 km/h in this embodiment). ) is inputted to the comparator 305 and Vs1<Vs
In the case of 2, the output to circuit C changes to high level.

The circuit B and the circuit C are input to the AND circuit 500 and output to the circuit D, and the circuit D and the circuit A are input to the AND circuit 600 and output to the warning circuit 400.

The warning circuit 400 includes a monostable multivibrator 401 and a light emitting diode 402, and when a pulse signal indicating the danger of burnout of the input clutch is input from the AND circuit 600, the multivibrator 401 spreads the signal to a suitable interval for visual confirmation. The light emitting diode 402 is converted into a pulse signal and output, causing the light emitting diode 402 to blink.

Next, the operation of the above embodiment will be explained.

N by manual operation of the automatic transmission shift lever
→D shift or N→R shift, N→
The output from the D, N→R detection circuit 202 to the monostable multivibrator 203 changes to high level,
A pulse signal is output from the multivibrator 203 to circuit B within a predetermined time (0.6 seconds in this embodiment).
At this time, the vehicle speed is set to a predetermined value (in this example, 5 mph).
Km/h) and the output from the vehicle speed detection device 300 to the circuit C is at a high level, the AND circuit 500 outputs the pulse signal to the circuit D within the predetermined time. Furthermore, the predetermined time (0.6 seconds)
Throttle opening is set to a predetermined value a% due to engine racing, etc.
(10% in this embodiment) and the output from the throttle opening detection device 100 to the circuit A changes to a high level, the AND circuit 600 sends the warning circuit 40
A pulse signal is output to 0, and the monostable multivibrator 401 spreads the pulse signal to an interval that can be easily confirmed with the naked eye, and the light emitting diode 402 blinks.

The transmission input clutch burnout prevention warning device of the present invention includes a throttle opening detection means that detects and outputs a state in which the throttle opening exceeds a set value, and a throttle opening detection means that detects and outputs a state in which the throttle opening exceeds a set value, and a A shift detection means that detects and outputs a shift from N (neutral) to R (reverse), a vehicle speed detection means that detects and outputs a state where the vehicle speed is below a predetermined value, and electrical signals from the above three detection means are input. The vehicle is equipped with a warning means that warns the driver by emitting light, etc., when the accelerator is depressed within a predetermined time after a N→D shift or N→R shift, the throttle opening is greater than a predetermined value, and the vehicle speed is below a predetermined value. The system is configured to issue a warning to the driver by emitting light, etc. when the vehicle is stopped or the vehicle speed is lower than a predetermined speed.
If the throttle opening reaches a predetermined value or more within a predetermined time after a shift has been performed, and there is a risk of excessive wear and burnout of the input clutch, a warning signal will be issued to the driver. This has the effect of preventing burnout.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of a planetary gear unit of a known three-legged automatic transmission, and FIG. 2 is a block diagram showing a burnout prevention warning device for a transmission input clutch according to the present invention. In the figure, 24, 25...input clutches, 100...
Throttle opening detection device, 200...shift detection device, 300...vehicle speed detection device, 400...warning device.

Claims (1)

[Claims] 1 Vehicle speed detection means for detecting the vehicle speed of the automobile, throttle opening detection means for detecting the throttle opening degree, shift position detection means for detecting the selected position of the shift lever, the vehicle speed detection means, and the throttle opening degree detection means. and a warning device for inputting a signal from the shift position detecting means and issuing a warning signal, wherein the vehicle speed detecting means outputs a signal when the vehicle speed is below a predetermined value. The throttle opening detection means has a second circuit that outputs a signal when the throttle opening is equal to or greater than a predetermined value, and the shift position detection means has a first circuit that outputs a signal when the throttle opening is at least a predetermined value. The warning device includes a third circuit that emits a signal for a predetermined time when the vehicle is operated from the forward position to the forward position or from the neutral position to the reverse position, and the warning device receives signals from the first circuit, the second circuit, and the third circuit. A warning device for preventing burnout of a clutch for transmission input, characterized in that it emits a warning signal when the clutch is input.