KR102440497B1 - Method for Enforcing Parking Safety in Vehicle - Google Patents

Abstract

In a vehicle to which the parking safety reinforcement method of the present invention is applied, after the parking position of the parking sprag 20 and the parking gear 3 is detected by the controller 50, it is switched from “butting” to “parking”. By implementing the parking at the P (Parking) stage of the ramp as the parking entry condition mode, the vehicle pushing phenomenon (or squeaking phenomenon) that occurred when parking at the P stage of the ramp is prevented. It has the characteristics of maintaining the durability of the parking lock system while preventing damage to gears meshed with each other in the "parking" state.

Description

Method for Enforcing Parking Safety in Vehicle

The present invention relates to vehicle parking, and more particularly, to a method for enhancing parking safety of a vehicle that prevents damage to a parking lock system while preventing a vehicle rolling phenomenon (or squeaking phenomenon) during P-stage parking on a slope.

In general, a parking lock system (or parking brake system) of a vehicle prevents vehicle movement by restricting the rotation of a powertrain that transmits power to a driving wheel when the vehicle is parked and stopped.

The parking lock system is called a cable parking mechanism type because the cable parking mechanism connected to the P-stage of the shift lever engages the parking gear and the action is made.

As an example, the cable parking mechanism type parking lock device has a parking sprag that is converted from a “butting” state located on the driven gear to a “parking” state located between the gears, and the P stage of the shift lever. It includes an override cable linked to the entry and is operated in conjunction with the brake system.

Therefore, in the cable parking mechanism type parking lock device, when the P-stage is entered after stopping the vehicle by the driver's operation of the foot brake, the parking sprag is linked to the movement of the override cable and moves toward the driven gear. It is converted to the state and positioned between the gears of the driven gear. As a result, even if the driver releases the foot brake, the vehicle is in a parking state in which movement is prevented due to the restraint of the driven gear by the parking sprag.

Domestic Patent Publication No. 10-2012-0137659 (December 24, 2012)

However, the cable parking mechanism-type parking lock device is a weak method for securing parking safety when parking on a slope P stage because the parking state is completely dependent on the binding force of the parking sprag and the driven gear.

The reason for this is that the driven gear acting as the parking gear is connected to the drive shaft, and parking on an incline of the vehicle causes torque generation by the weight of the vehicle. It has to be moved by the rotation of the gears.

Therefore, when the vehicle is placed in the P-stage parking of the ramp, the vehicle is pushed (or squeaked) due to the malfunction of the parking lock device, and furthermore, it is converted from the "parking" state to the "butting" state, which can develop into parking release. have.

Above all, when the durability and strength of the parking sprag or the gear of the driven gear is weakened, the parking sprag or gear tooth breakage can occur, so that the vehicle on the ramp cannot be safely protected from the P-stage parking on the ramp.

Accordingly, the present invention in consideration of the above points is a vehicle pushing phenomenon (or squeaking phenomenon) by maintaining the gear engagement in the "parking" state by confirming the "parking entry condition" of the parking sprag using the piezo sensor and then parking the P-stage on the ramp. ), and in particular, it is an object to provide a method of enhancing parking safety of a vehicle in which the durability of the parking lock system is maintained along with the prevention of damage to parking sprags or gear teeth by not switching from the "parking" state to the "butting" state.

The method for enhancing parking safety of a vehicle according to the present invention for achieving the above object includes the steps of (A) recognizing that the brake pedal is ON on a slope, (B) decelerating the vehicle speed by brake hydraulic pressure, (C) the parking gear (3) confirming the parking position in the rotation, (D) increasing the brake hydraulic pressure after confirming the parking position, (E) stopping the vehicle due to the increase in the brake hydraulic pressure, (F) the After the vehicle is stopped, it is characterized in that it is performed as a step of parking the ramp P (Parking) stage.

In a preferred embodiment, the deceleration of the vehicle speed is 2 Kph. Confirmation of the parking position is a voltage signal of the piezo sensor ( voltage signal).

In a preferred embodiment, stopping the vehicle is made by increasing the brake hydraulic pressure. In the parking at the P (Parking) stage of the ramp, the P stage operation of the shift lever switches the parking sprag from the “butting” to the “parking” through an override cable.

In addition, the vehicle of the present invention for achieving the above object stops the vehicle by checking the parking position of the parking gear after decelerating the vehicle speed when the brake pedal is ON on a slope, and after stopping the vehicle, by operating the P (Parking) stage of the shift lever A controller that implements ramp P (Parking) stage parking; a brake system in which brake hydraulic pressure is controlled by the controller; and a parking lock system in which the P (Parking) stage is parked by the controller.

As a preferred embodiment, the parking lock system 10 is interlocked with the parking gear coupled to the drive shaft of the transmission to switch from “butting” to “parking”, and is linked to the P-stage operation of the shift lever. It includes an override cable for manipulating the lag, and a piezo sensor for detecting the parking position from the parking gear. The piezo sensor detects a sensing groove dug between the teeth of the parking gear of the parking gear, generates a voltage signal of +5V HIGH and -5V LOW, and applies the voltage signal as a detection signal of the parking position.

The vehicle of the present invention implements the following actions and effects by further performing the "parking entry condition" when parking the P-stage of the ramp.

First, as the "parking entry condition", the phenomenon of vehicle movement on the slope is offset, so that the P-stage parking is made on the slope without the vehicle pushing (or squeaking). Second, the addition of hardware can be minimized by detecting the groove between the gear teeth of the parking gear with a piezo-type speed sensor to form a “parking entry condition”. Third, even if the foot brake is released after parking on the P-stage of the slope, the transition from the "parking" state to the "butting" state does not occur, so that sorting is not applied to the parking sprags or gear teeth. Fourth, it is possible to prevent the parking sprags or gear teeth from being damaged by not being impacted by the parking sprags or gear teeth during P-stage parking on the slope. Fifth, the durability of the parking lock system can be maintained by preventing the parking sprags or gear teeth from being damaged.

1 is a flowchart of a method for enhancing parking safety of a vehicle according to the present invention, FIG. 2 is an example of a vehicle to which a parking lock system in which a method for enhancing parking safety according to the present invention is applied, and FIG. 3 is a piezo sensor according to the present invention and the detailed configuration of the parking gear, FIG. 4 is an example of the output signal of the piezo sensor applied as the "parking entry condition" according to the present invention, and FIG. 5 is the parking lock system according to the present invention " This is an example of an operation that switches to the "parking" state.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying illustrative drawings, and since such an embodiment may be implemented in various different forms by those of ordinary skill in the art to which the present invention pertains, it will be described herein It is not limited to the embodiment.

Referring to FIG. 1 , the parking safety reinforcement method of the vehicle detects the parking position with a voltage signal output from the piezo sensor when the vehicle speed is 2Kph or less by the foot brake, and sets the parking position detection as "parking entry condition" It is characterized in that the parking using the P-speed shift is performed after the vehicle is stopped.

Referring to FIG. 2 , a vehicle 1 includes a controller 50 to which a brake system 7 , a parking lock system 10 , and a parking entry condition map 50 - 1 are linked.

Specifically, the brake system 7 is a conventional hydraulic brake system that brakes the wheel by generating hydraulic pressure with a foot brake. Therefore, the brake system 7 includes the same components as a conventional hydraulic brake system for a vehicle and performs the same operation.

Specifically, the parking lock system 10 includes a parking sprag 20 , an override cable 30 , and a piezo sensor 40 .

For example, the parking sprag 20 is connected to the override cable 30, rotates the hinge shaft about the rotation center, and has sprag gear teeth 20-1 as an outer circumferential surface. Therefore, the parking sprag 20 is a "butting" in which the sprag gear tooth 20-1 is not meshed with the parking gear tooth 3a of the parking gear 3 coupled to the drive shaft 3-1 of the transmission. Implement the operation of "parking". Therefore, the parking gear 3 is the same as the driven gear. The override cable 30 is linked to the P-stage operation of the shift lever 5 so that the parking sprag 20 rotates with the hinge shaft as the rotational center. The piezo sensor 40 is mounted to be close to the driven gear 3 using a transmission housing. Therefore, the piezo sensor 40 may be a general vehicle speed sensor.

Specifically, the controller 50 treats a brake pedal (foot brake) signal, a brake pressure, a vehicle speed, a shift stage of P-N-R-D, etc. as input data, and controls the hydraulic pressure of the brake system 7 . The parking entry condition map 50-1 processes a voltage signal output from the piezo sensor 40 as input data and transmits a signal of “parking entry condition” to the controller 50 . Therefore, the controller 50 and the parking entry condition map 50 - 1 may be an engine electronic control unit (ECU).

Hereinafter, a method for enhancing parking safety will be described in detail with reference to FIGS. 2 to 5 . In this case, the controlling subject is the controller 50 associated with the parking entry condition map 50 - 1 , and the controlling subject is the parking lock system 10 .

S10 is a step in which the brake pedal ON is recognized by the controller 50 , and S20 is a step in which the deceleration state of the vehicle speed is determined by the controller 50 .

Referring to FIG. 2 , the controller 50 recognizes that the brake pedal is ON using the brake pedal (foot brake) signal, and controls the brake system 7 with brake hydraulic pressure to reduce the vehicle speed. At this time, the controller 50 applies the following equation to satisfy the deceleration state of the vehicle speed.

Satisfy vehicle speed deceleration: vehicle speed < 2Kph

Here, "<" is an inequality sign indicating a relationship between two values.

Therefore, the controller 50 maintains control over the brake system 7 until the vehicle speed reaches less than 2Kph.

S30 is a step in which the parking position is determined by the controller 50 .

Referring to FIG. 2 , the parking entry condition map 50-1 detects the parking position from the voltage signal of the piezo sensor 40 and transmits it to the controller 50, and the controller 50 controls the parking entry condition It is determined that the "parking entry condition" is satisfied by the output of the map 50-1. Referring to FIG. 3 , the piezo sensor 40 generates a voltage signal for the sensing groove 3b dug deeper between the parking gear 3 and the parking gear tooth 3a at the position of the gap A. and the generation of the voltage signal means detection of a parking position. Here, the depth of the sensing groove 3a is dug deeper than the gear teeth between the gear teeth of the parking gear 3 .

As an example, the specifications of the parking gear 3 , the parking sprag 20 and the tire are applied as follows.

Tire: 0.286m tire diameter, 1.8m tire travel distance per wheel rotation

Parking gear (3): 0.097 m diameter, 0.3 m gear circumference

Parking Sprague (20): Spacing of Sprague Gear (20-1) of 0.0097m

In this case, since the moving distance of the tire is calculated as 0.06 m, even if the vehicle 1 is controlled to be stopped only in the parking position, it does not cause any inconvenience or problems to the driver's vehicle use.

Referring to FIG. 4 , the voltage signal of the piezo sensor 40 is +5V HIGH when passing through the sensing groove 3b, and -5V LOW is output when passing through the parking gear tooth 3a. It can be seen that the parking position detection state is the parking entry condition.

S40 is a step in which the brake flow rate is increased by the controller 50, S50 is a state in which the vehicle is stopped by the controller 50, and S60 is a P-stage operation of the shift lever for parking by the controller 50 This is a confirmed step.

Referring to FIG. 2 , the controller 50 increases the hydraulic pressure of the brake system 7 to stop the vehicle 1 and confirms the vehicle stop at the detected 0Kph vehicle speed.

Referring to FIG. 5 , as the override cable 30 is pulled by the P-stage operation of the shift lever, the parking sprag 20 is rotated around the hinge shaft as the center of rotation. Then, as the parking sprag 20 moves to the parking gear 3, the sprag gear tooth 20-1 and the parking gear tooth 3a, which were in the "butting" state that are not meshed with each other, are switched to a "parking" state that meshes with each other. . As a result, the sprag gear tooth 20-1 and the parking gear tooth 3a become "parked" at the correct gear meshing position, so that torque generation due to the weight of the vehicle when parking on the slope P stage causes the rotation of the drive shaft and the parking gear 3 Even if it is brought, it cannot be developed due to the vibration of the gears meshing with each other. Therefore, even if the vehicle 1 is parked at the P-stage on an incline, it does not cause damage to the sprag gear tooth 20-1 and the parking gear tooth 3a, and in particular, the vehicle pushing phenomenon (or squeaking phenomenon) due to the malfunction of the parking lock system 10 . ) will not occur.

As described above, in the method for enhancing the parking safety of a vehicle according to the present embodiment, after the parking positions of the parking sprag 20 and the parking gear 3 are detected by the controller 50, in "butting" As the parking entry condition mode that is converted to “parking”, parking at the P (Parking) stage of the ramp is implemented to prevent the vehicle pushing (or squeaking phenomenon) that occurred when parking at the P stage of the ramp, and in particular, the “butting” state in the “parking” state The durability of the parking lock system is maintained along with the prevention of breakage of the gears meshed together in the "parking" state by not switching to the "parking" state.

1: Vehicle 3: Parking gear
3a: parking gear tooth 3b: sensing groove
3-1: drive shaft 5: shift lever
7: brake system 10: parking lock system
20: Parking Sprag
20-1 : Sprague Gear
30: override cable 40: piezo sensor
50: controller 50-1: parking entry condition map

Claims (6)

(A) When parking on the slope P (Parking) stage, the brake pedal ON is recognized by the controller, (B) the vehicle speed is decelerated by the brake hydraulic pressure, (C) the parking position is confirmed from the parking gear, (D ) is performed as a step in which the vehicle is stopped after confirming the parking position;
The parking gear generates a voltage signal between the parking gear teeth formed on the outer circumferential surface using a sensing groove that is dug deeper than the gear tooth trough;
Wherein the voltage signal (Voltage Signal) is generated when passing the parking gear tooth and the sensing groove.
The method according to claim 1, wherein the confirmation of the parking position is made of a voltage signal (Voltage Signal) of a piezo sensor that detects the parking gear.
delete The method according to claim 1, wherein the voltage signal outputs +5V HIGH from the sensing groove and -5V LOW from the mountain of the parking gear.
The method according to claim 1, wherein the stopping of the vehicle is made by increasing the brake hydraulic pressure.
The method of claim 1 , further comprising: (E) performing parking at the ramp P (Parking) stage after the vehicle is stopped;
Parking safety enhancement method of the vehicle, characterized in that it further comprises.

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