KR920003871Y1 - Wrong change-speed gearing protection system of end clutch at d-range of autotransmission - Google Patents

Abstract

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Description

Malfunction shift prevention system of 4-stage clutch in the drive range of automobile auto transmission

1 is a shift single crystal pattern of the vehicle throttle (THROTTLE) opening and closing (opening) and the vehicle speed equipped with a general auto transmission.

2 is a flowchart for the system of the present invention.

3 is a block diagram of a system of the present invention.

4 is a circuit diagram according to the present invention.

* Explanation of symbols for main parts of the drawings

10: engine 12: engine characteristic detection means

14: engine speed calculation means

16: THROTTLE VALVE

18: throttle opening detection means 20: vehicle speed detection means

22: overdrive switch state detection means

24: gear shift determination means

25: AUTO-TRANSMISSION

28: valve drive means 30: four-stage clutch fault display means

The present invention relates to a malfunction shift prevention system for a four-stage clutch in a drive range (D-RANGE) of an automobile autotransmission, and specifically, to prevent idling of the engine even when the four-stage clutch fails, and at the same time, It's about a system that can display it.

General automotive auto transmission is the same principle as manual transmission, but detects the vehicle speed at the rotational speed of the propulsion shaft, load is detected at the opening degree (opening degree) of the throttle valve, and calculates the vehicle speed based on this. After deciding whether or not to be done, shift the gearbox by turning ON / OFF the gearbox.

In other words, the gearbox selects UPSHIFT or DOWNSHIFT, which shifts the gear from the large gear to the small gear, and the shift point is determined according to the opening of the throttle valve and the vehicle speed. The shift point in the drive range is determined by the opening degree and the vehicle speed of the throttle valve as shown in FIG. The shift point also increases as the opening of the throttle valve increases.

The control of the auto transmission is made by the hydraulic control device and the flow path of the hydraulic circuit is controlled by the shift lever of the driver's seat. The shift lever is usually P (PARKING, parking), R (REVERSE, reversing), It has seven ranges: N (NEUTRAL, neutral), D (DRIVE, high speed), 2 (SECOND), and L (LOW, low speed).

The present invention aims to provide a malfunction shift prevention system of a four-speed clutch for overdrive in a dual drive range.

The driving method in the drive range is to keep the throttle opening constant with the shift lever in the drive range, and when the vehicle is driven in an overdrive, the vehicle speed increases and the TCU (TRANSMISSION CONTROL UNIT) crosses the 3 → 4 shift line. At 3 → 4 upshift command will be issued.

However, when the END CLUTCH is damaged or malfunctions, the clutch selection command is not transmitted to the computer even when the vehicle is driven in the four-stage enabled state, that is, the overdrive state because the four-stage clutch does not operate. Without accelerating, the engine will only repeat idling at high speeds.

In more detail, if the four-speed clutch does not operate due to a malfunction of the hydraulic circuit for clutch selection, the vehicle speed becomes 1 → 2 → 3 → 4 when the driver turns the switch on with the overdrive. It is increased and upshifted, but because the four-speed clutch is broken, the engine power is not transmitted to the wheel after the 3 → 4 shift occurs.

After 4 → 3 shifts, the engine power is transmitted to the wheels, so the vehicle speed increases again. When 3 → 4 shifts are reached, the engine power is not transmitted to the wheels when the 4th clutch is broken.

Therefore, since the engine power is not transmitted to the wheel after the 3 → 4 shift issuance, even if the engine r.p.m rises significantly, the power is not correctly transmitted to the wheel, so the vehicle runs only with elasticity and the wear rate of the parts and the fuel consumption increase.

The present invention has been devised to solve such drawbacks, and the outline is not power transmission to the wheel, but the engine is rapidly rising and the overall speed of the engine is turned on until the starting switch is turned off. This prevents the live function from being upshifted by four speeds.

In addition, by combining the high-level display lamp of the four-speed clutch to combine the system to output the self-diagnosis output signal, to help the driver's safe operation.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention provides an engine characteristic detecting means (12) connected to the engine (10), an engine speed calculating means (14) for receiving an output from the engine characteristic detecting means (12) and calculating a sudden increase in the engine speed; The shift stage is formed by combining the throttle opening degree detecting means 18 for detecting the opening degree of the engine throttle valve 16, the vehicle speed detecting means 20 for detecting the vehicle speed, and the outputs from the means 14, 20. An overdrive switch state detection means 22 for detecting whether the switch is ON / 0FF for overdrive selection is input to the shifting stage determination means 24 for determining, and driven by the output of the shifting stage determination means 24. For the four-speed clutch of the automatic transmission configured to be outputted to the valve driving means 28 and the four-speed clutch failure display means 30 for preventing the 3 → 4 upshift of the automatic transmission 26 from occurring. Malfunction shift prevention system.

The operation and effect according to the present invention of this configuration will be described in detail.

In FIG. 3, the engine characteristic detecting means 12 connected to the engine 10 to detect the rotational speed detects the sudden rotational speed more than the rotational speed required for the overdrive, and the sudden rotational speed is the engine rotational speed ( Engine rotation speed calculating means 14 for calculating the period of the ignition signal pulse).

If the engine supply and demand increase is determined, the four-stage clutch is in a broken or malfunctioning state. Therefore, the shift stage determination means 24 causes the shift stage determination means 24 to eliminate the overdrive function so that the solenoid valve for shift stage determination is not shown. Output the shield command so that the auto transmission 26 is shifted from 4 to 3 speed.

(Here, the reason for eliminating the overdrive function is to solve the problem of the conventional four-stage clutch failure in which an upshift of 3 to 4 speeds is repeatedly performed later).

Of course, in determining the shift stage, the engine speed and the throttle opening degree detection, the vehicle speed detection, and the overdrive switch on state are collectively determined by the shift stage determining means 24. In the case of a short clutch failure, the overdrive function is turned off even if the driver turns on the overdrive switch, so the 3 → 4 speed upshift does not occur.

The above process will be described in detail with the flowchart of FIG.

When the engine starts to rotate, the throttle opening and the vehicle speed are calculated, and when the OVER DRIVEFLAG (ODF) is set, the overdrive switch is turned off unconditionally, and the OWF failure flag (ODF) is cleared. , Reads the actual overdrive switch state.

The shift start signal is generated at the gear shift stage, and the shift start signal is generated only when the shift is performed or returned.

In case of shifting, it asks if it is 4 gears. If it is not 4 gears, it is returned and if it is 4 gears, the engine speed is increased. Turn off the overdrive function. Therefore, the hydraulic circuit is forced to downshift from 4 to 3 speeds, and the overdrive flag is set to prevent upshifts from 3 to 4 speeds later, eliminating the problem caused by the conventional four-stage clutch failure. Given.

In addition to the above, when the engine sudden rise is determined to be equipped with a means 30 for indicating a failure, such as a four-stage clutch in the instrument cluster, so that the driver can easily check.

According to the present invention as described above, while the engine speed is increased when the four-stage clutch is broken (defect), the engine power is not transmitted to the wheel can be eliminated to reduce fuel waste and wear, parts upshift and downshift This eliminates unnecessary repetition of the hydraulic system and prevents the breakdown of the hydraulic system and clutch configuration, and the driver can check the failure of the four-stage clutch, which can be easily repaired and contribute to the safety of the vehicle.

Claims (1)

The engine characteristic detecting means 12 connected to the engine, the engine speed calculating means 14 for calculating the sudden increase in the engine speed by receiving the output of the engine characteristic detecting means 12, and the engine throttle valve 16 Throttle opening degree detecting means 18 for detecting the opening degree, vehicle speed detecting means 20 for detecting the vehicle speed, and shift stage determining means 24 for determining the speed change stage by receiving the output from the means 14, 20. In the shift stage determination means for causing the overdrive switch state detection means 22 to be inputted to the shift stage determination means 24 and receiving the output from the shift stage determination means 24 to control the flow path of the auto transmission 26. A malfunction shift prevention system in the event of a failure or failure of a four-stage clutch in a drive range of an automobile auto transmission configured to be output to the valve driving means (28) and the four-stage clutch failure display means (30).