KR19990003580A - Engine brakes for automatic transmission vehicles - Google Patents

Abstract

The present invention relates to an engine brake apparatus for an automatic transmission vehicle, and an object of the present invention is to provide an engine brake for an automatic transmission vehicle to improve a braking force by lowering the automatic transmission when the vehicle speed is rapidly reduced due to the operation of the brake. In providing a device.

The present invention for realizing the above object is a brake switch for checking the operating state of the brake, a vehicle speed sensor for measuring the speed of the vehicle, the state of the brake switch and the value of the vehicle speed sensor to control the transmission It consists of a TCU that automatically lowers the gearbox when the vehicle decelerates and activates the engine brake.

Description

Engine brakes for automatic transmission vehicles

The present invention relates to an engine brake apparatus for an automatic transmission vehicle, and more particularly, an engine brake apparatus for an automatic transmission vehicle to improve a braking force by shifting a lower transmission at a lower speed when a vehicle speed is rapidly reduced by the operation of a brake. It is about.

The transmission is installed between the clutch and the propulsion shaft to increase or decrease the rotational force of the engine according to the change in the driving state of the vehicle, and also has a reverse device for reversing the vehicle. It also serves to disconnect the engine from the drive wheels for a period of time when adjusting the engine or to warm up the engine.

In particular, the automatic transmission has the following advantages as compared to the manual transmission by automating the operation of the clutch and the transmission instead of the human machine.

It is convenient to drive because there is no need to shift gears, and the engine is less likely to stop due to inexperienced operation while driving, which reduces driver's fatigue and enables safe driving. In addition, since the transmission of the engine rotational force is fluid, the oscillation, acceleration, and deceleration are smooth and the riding comfort is good.The fluid acts as a damper, and the vibration or shock transmitted from the engine to the power transmission device or the other parts of the engine. It can absorb the vibration or vice versa to absorb the vibration or shock applied to the engine from the wheel and it is not directly applied to the engine even when overloaded, there is an advantage to protect the engine and to prolong the life of each part.

In addition, the disadvantage is that the structure is complicated and expensive, and the fuel consumption is higher than the manual transmission.

There are many ranges in the automatic transmission that can be adjusted by operating the shift lever. For example, there are 'L', '2', 'D', 'N', 'R' and 'P' ranges. That is, the 'D' range is a range selected for driving, and automatic shifting occurs. 'N' is neutral and 'P' is parked. In addition, 'L' and '2' are used for engine brakes when they require large force by limiting automatic shift.

However, in order to operate the engine brake, the driver has to lower the shift lever to the lower stage, so operating the engine brake while operating the brake due to a sudden accident during a high speed driving of a vehicle is difficult to realize unless an experienced driver.

The present invention has been made to solve the above problems, an object of the present invention is to provide an engine brake device for an automatic transmission vehicle to operate the engine brake by shifting the lower gear stage automatically when the speed of the vehicle is suddenly reduced. In providing.

1 is a block diagram showing an engine brake apparatus for an automatic transmission vehicle according to the present invention.

2 is a flowchart showing the operation sequence of the engine brake apparatus of the automatic transmission vehicle according to the present invention.

* Explanation of symbols for main parts of the drawings

10: brake switch 20: vehicle speed sensor

30: TCU (Transmission Control Unit)

40: transmission

The present invention for realizing the above object is a brake switch for checking the operating state of the brake, a vehicle speed sensor for measuring the speed of the vehicle, the state of the brake switch and the value of the vehicle speed sensor to control the transmission To the TCU.

Referring to the operation of the present invention made as described above are as follows.

If the brake is operated and the speed of the vehicle is decelerated rapidly by checking the state of the brake switch, the TCU determines that it is a sudden deceleration, and the gear stage of the transmission is judged. .

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings. In addition, this embodiment is not intended to limit the scope of the present invention, but is presented by way of example only.

1 is a block diagram of an engine brake apparatus of an automatic transmission vehicle according to an embodiment of the present invention. As shown in FIG. 1, a brake switch for checking an operating state of a brake device, a vehicle speed sensor for measuring a vehicle speed, a shift device for shifting by receiving a state of a brake switch and a value of a vehicle speed sensor are controlled. To the TCU.

When explaining the operation of the embodiment of the present embodiment made as described above with reference to the flow chart showing the operation sequence of the engine brake device of the automatic transmission vehicle shown in FIG.

Check the power status of the engine brake system. If the power is off, it shuts down. If the power is on, the speed of the vehicle is measured. And check the operation of brake switch. If the brake is not activated, the brake switch is turned off, so the engine brake is returned to the step of checking the power supply status. If the brake is activated, the speed of the vehicle is measured to detect the speed change of the vehicle again. The changed speed is calculated from the speed measured before the brake is operated and the speed measured after the brake is operated. Compare the calculated rate of change with the reference value. As a result of the comparison, if the speed change before and after the operation of the brake is small, it is judged to be a slow deceleration. However, if the speed change before and after brake operation is greater than the reference value, the current shift stage is detected and compared with more than three stages. If the current gear is in less than 3 gears, that is, in the 1st or 2nd gear position, the engine brake of the gearshift gear itself is activated. Therefore, check the power supply status without operating a separate engine brake. Return to step However, if the current gear stage is higher than three gears, the gear stage is shifted to the lower stage so that the engine brake is operated and the power supply status is returned.

As described above, the present invention has the advantage that the braking distance is secured by improving the braking force by allowing the engine brake to operate automatically when the lower speed occurs automatically when a sudden deceleration occurs in the automatic transmission vehicle.

Claims (1)

Engine of an automatic transmission vehicle comprising a brake switch for checking the operating state of the brake, a vehicle speed sensor for measuring the speed of the vehicle, and a TCU for controlling the transmission by receiving the state of the brake switch and the value of the vehicle speed sensor. brake.