KR20020053589A - Semi-active suspension system of the car - Google Patents

Abstract

PURPOSE: A semi-active suspension system of a vehicle is provided to improve the traveling experience of a vehicle and the stability of a travel by controlling the variable damping forces of a variable damper and an actuator. CONSTITUTION: A sensor block(100) of a semi-active suspension system of a vehicle includes a first, second, and third acceleration sensors(101a,101b,101c), a vehicle speed sensor(102), a brake sensor(104), a throttle position sensor(105), a front passenger's seat sensor(107), and a rear seat sensor(109). The detecting values of the sensors are inputted to a traveling experience control logic(111) as a first logic and to a vehicle speed sensing control logic(113) as a second logic, to an anti-roll control logic(115) as a third logic, to an anti-dive control logic(117) as a fourth logic, and to an anti-squat control logic(119) as a fifth logic. If the detecting value of the vehicle speed sensor is higher than a predetermined value, the damping force of a damper is improved. Particularly, the damping force corresponding to the sensing positions of the front passenger's seat sensor and the rear seat sensor are changed sensitively.

Description

Semi-active suspension system of vehicle {SEMI-ACTIVE SUSPENSION SYSTEM OF THE CAR}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a suspension system of a vehicle. In particular, the ride comfort of a vehicle is improved by adjusting the variable damping force of a variable damper and an actuator independently connected to four wheels of a vehicle by receiving position information of a person in a vehicle. A semi-active suspension system of a vehicle that can be made.

Generally, a suspention system is a device that connects axles with wheels and a unit such as a frame, a motor, a power transmission device, etc., except for a chassis, and has a damper and an actuator. It is characterized by absorbing the shock received from the unevenness of the (凹凸).

Recently appeared semi-active suspension system is a device that improves the driving stability and ride comfort by varying the motion characteristics of the damper mounted on the vehicle in real time. In other words, if the driver excessively steers or the vehicle moves out of a constant track, the driver may be in danger of tipping over the vehicle or unpredictable due to the loss of steering and loss of steering power. However, in the case of a vehicle equipped with this semi-active suspension system, it is possible to ensure the stability of the vehicle during turning, braking and driving by maintaining the vertical load on the tire ground plane at an appropriate level when driving on an irregular road surface. By effectively isolating the irregular pressure on the road surface, it provides passengers with ride comfort and driving comfort.

The semi-active suspension system detects the driving state of the vehicle through a vertical acceleration sensor, a vehicle speed sensor, a steering angle sensor, a brake sensor, and a throttle position sensor among various sensors mounted on the vehicle. The actuator was controlled.

1 is a schematic circuit block diagram of a semi-active suspension system of a vehicle according to the prior art.

Referring to FIG. 1, a circuit of a conventional semi-active suspension system includes a sensor block 10, a calculation logic block 20, a damper control unit 30, and a variable damper and actuator block 40.

The sensor block 10 includes at least three first to third vertical acceleration sensors 11a, 11b, 11c, a vehicle speed sensor 13, a steering angle sensor 15, a brake detection sensor 17, and a throttle position sensor 19. ). These sensors are mounted on certain parts of the vehicle to detect and transmit detection signals (eg, vertical acceleration of the three wheels, vehicle speed, steering angle, brake detection, throttle position detection, etc.) when the vehicle is driven. do.

The arithmetic logic block 20 is a ride control logic 21 as the first logic, a speed sensitive control logic 23 as the second logic, and an anti-roll control logic as the third logic. (25), an anti-dive control logic 27 as the fourth logic, and an anti-squat control logic 29 as the fifth logic.

Here, the ride comfort control logic 21 is applied to each wheel independently, and in response to the detected signal of the first to third vertical acceleration sensors 11a, 11b, and 11c, the vehicle is controlled by suppressing the resonance of the vehicle in the resonance region. On the other hand, in the ride comfort area, the damper control unit softly adjusts the damping force of the damper to provide the damper controller 30 with a control signal to improve the ride comfort.

In addition, the vehicle speed sensitive control logic 23 calculates the vehicle speed sensitive value in response to the detection signal of the vehicle speed sensor 13, and provides the vehicle speed sensitive value to the damper controller 30 to secure high-speed running stability of the vehicle. If the sensitivity is above the set value, adjust the damping force upward.

In addition, the anti-roll control logic 25 calculates the change amount of the lateral acceleration and the roll value in response to the detection signals of the vehicle speed sensor 13 and the steering angle sensor 15 when the vehicle is being steered, and thus the damper controller 30. ) To suppress the roll movement of the vehicle according to the steering input of the driver.

In addition, the anti-dive control logic 27 detects sudden braking of the vehicle in response to the detection signal of the brake detection sensor 17 and the vehicle speed signal of the vehicle speed sensor 13, and the damping force of the damper when the vehicle is decelerated above a set value. By adjusting the hard (hard) to calculate the dive value to ensure the stability of the vehicle and transmits to the damper controller (30).

In addition, the anti-squat control logic 29 detects the throttle position angle of the throttle position sensor 19 and calculates a squat value for controlling the pitch movement of the vehicle, and transmits it to the damper controller 30.

On the other hand, the damper controller 30 receives the control signals provided from the control logic (21, 23, 25, 27, 29) as described above to determine the damping force value of the damper to be applied to the four wheels, each variable damper And control the driving of the actuator.

Finally, the variable damper and actuator block 40 includes first to fourth variable dampers and actuators 41, 43, 45, 47 to control four wheels, respectively. As an actuator, a stepping motor or solenoid can be used.

Referring to Figure 1, the semi-active suspension system according to the prior art will operate as follows. The detection values of the sensors 11a to 19 in the sensor block 10 during driving of the vehicle are determined by the ride comfort control logic 21, the vehicle speed sensitive control logic 23, and the anti-roll control logic 25 of the operation logic block 20. It is input to the anti-dive control logic 27, anti-squat control logic (29). Then, each control logic 21, 23, 25, 27, 29 provides the damper controller 30 with a control signal and a calculated value according to the detected value of the corresponding sensor. The damper controller 30 generates a value for controlling the damping force of the first to fourth variable dampers to independently control the four wheels according to the control signal and the calculated value transmitted from the control logic. According to the control signal of the damper controller 30, the damper damping force of the first to fourth variable dampers and the actuators 41, 43, 45, and 47 is varied so that driving of the actuator of the wheel is independently controlled.

Therefore, the semi-active suspension system according to the prior art uses the vehicle's vertical acceleration sensor, vehicle speed sensor, steering angle sensor, brake sensor, and throttle position sensor to independently control the driving of the damper and actuator connected to each wheel. Achieve ride comfort and running stability.

However, since the conventional semi-active suspension system controls the four wheels independently based on the driver's riding comfort, there is a problem that the riding comfort of the passenger in the front passenger seat and the rear seat is lower than the driver.

An object of the present invention is to equip the four wheels of the vehicle by using a sensor for detecting the position information of the person in the passenger seat and the rear seat of the vehicle to solve the problems of the prior art and using the detected value of the sensor The present invention aims to provide a semi-active suspension system for a vehicle that can improve the ride comfort of the passenger seat and the rear seat by adjusting the variable damping force of the connected variable damper and actuator.

1 is a schematic circuit block diagram of a semi-active suspension system of a vehicle according to the prior art;

2 is a schematic circuit block diagram of a semi-active suspension system of a vehicle according to the present invention.

<Description of the code | symbol about the principal part of drawing>

100: sensor block 110: arithmetic logic block

120: damper control unit 130: variable damper and actuator block

In order to achieve this object, the present invention provides a first logic for detecting a ride comfort by detecting values of at least three-wheel vertical acceleration sensors, a second logic for detecting a vehicle speed sensor and controlling a vehicle speed response, and a steering angle. Third logic to detect the sensor to control the damping force adjustment roll, fourth logic to detect the vehicle speed sensor and the brake detection sensor to control the damping force adjustment dive, and fifth logic to detect the throttle position monitoring sensor to control the damping force adjustment squat value In a vehicle having a control unit of a semi-active suspension system for independently controlling the damping force of the actuator and the variable damper connected to each of the four wheels of the vehicle by the control value detected by the control value, the pressure sensor on the passenger seat and the rear seat of the vehicle Is installed and the values detected by the pressure sensor of the passenger seat and the rear seat are input to both the first to fifth logic and Independently controls the damping force of the four-wheel variable damper and the actuator to increase the ride comfort of the passenger seat and the rear seat according to the output value of the first to fifth logic.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a schematic circuit block diagram of a semi-active suspension system of a vehicle according to the present invention.

As shown in FIG. 2, in the vehicle equipped with the semi-active suspension system (see FIG. 1), additional sensors 107 and 109 are installed in the passenger seat and the rear seat. That is, the sensor block 100 according to the present invention includes at least three first to third vertical acceleration sensors 101a, 101b, and 101c, a vehicle speed sensor 102, a steering angle sensor 103, and a brake detection sensor 10 4. And a throttle position sensor 105, a passenger seat sensor 107, and a rear seat sensor 109.

As described above, the semi-active suspension system of the present invention controls the damping force of the damper of the four wheels according to the values detected by the passenger seat sensor 107 and the rear seat sensor 109, and the comfort of the person riding on the passenger seat and the rear seat. Can improve.

In more detail, the operation of the semi-active suspension system of the present invention will be described.

The detection values of the first to third vertical acceleration sensors 101a, 101b, and 101c, the front passenger seat sensor 107, and the rear seat sensor 109 in the sensor block 10 during driving of the vehicle are determined by the operation logic block 110. It is input to the ride comfort control logic 111 as the first logic. The detection values of the vehicle speed sensor 102, the passenger seat sensor 107, and the rear seat sensor 109 are input to the vehicle speed sensitive control logic 113 as the second logic of the operation logic block 110. In addition, the detection values of the vehicle speed sensor 102, the steering angle sensor 103, the passenger seat sensor 107, and the rear seat sensor 109 are anti-roll control logic 115 as the third logic of the operational logic block 110. Is entered. In addition, the detection values of the vehicle speed sensor 102, the brake detection sensor 104, the front passenger seat sensor 107, and the rear seat sensor 109 are anti-dive control logic 117 as the fourth logic of the operation logic block 110. Is entered. In addition, the detection values of the throttle position sensor 105, the passenger seat sensor 107, and the rear seat sensor 109 are input to the anti squat control logic 119 as the fifth logic of the operational logic block 110.

Accordingly, the ride comfort control logic 111 controls the vehicle movement by suppressing the resonance of the vehicle in the resonance zone according to the detected signals of the first to third vertical acceleration sensors 101a, 101b, and 101c. Softly adjust the damping force of the damper, in this case sensitively controlling the damping force of the wheel damper corresponding to the position of the sensor in which the corresponding detection signal is generated in response to the detection values of the front passenger seat sensor 107 and the rear seat sensor 109. A value is provided to the damper control unit 120.

In addition, the vehicle speed sensitive control logic 113 calculates a vehicle speed sensitive value for securing high-speed driving stability in response to the detection signal of the vehicle speed sensor 102, and includes the front passenger seat sensor 107 and the rear seat sensor 109. The vehicle speed response value in consideration of the detected signal is provided to the damper controller 120. That is, when the detected value of the vehicle speed sensor 102 is greater than or equal to the set value, the damping force of the damper is adjusted upward, and the damping force of the damper corresponding to the sensing position of the passenger seat and the rear seat detection sensors 107 and 109 is highly sensitive to ride comfort.

In addition, the anti-roll control logic 115 calculates the change amount of the lateral acceleration and the roll value in response to the detection signals of the vehicle speed sensor 102 and the steering angle sensor 103 when the vehicle is being steered. 107 and a value considering the detected signal of the rear seat sensor 109 is provided to the damper controller 120. That is, the anti-roll control logic 115 suppresses the roll movement of the vehicle according to the steering input of the driver, and controls the roll movement in consideration of the riding comfort of the person riding in the passenger seat and the rear seat.

In addition, the anti-dive control logic 117 calculates a dive value for securing the stability of the vehicle in response to the detection signals of the vehicle speed sensor 102 and the brake detection sensor 104, the passenger seat sensor 107 and the rear seat The damper controller 120 provides a value in consideration of the detected signal of the detection sensor 109. That is, the damping force of the damper is hardly adjusted when the vehicle is decelerated above the set value, and the damping force is sensitively adjusted so that the riding comfort of the passenger who rides in the passenger seat and the rear seat is high.

In addition, the anti-squat control logic 119 calculates the squat value by detecting the throttle position angle of the throttle position sensor 105, taking into account the detected signals of the passenger seat sensor 107 and the rear seat sensor 109 By transmitting the value to the damper control unit 120, the pitch movement of the vehicle is controlled while increasing the ride comfort of the person riding in the passenger seat and the rear seat.

Accordingly, the damper control unit 120 is a ride comfort control logic 111, vehicle speed sensitive control logic 113, anti-roll control logic 115, anti-dive control logic 117, anti-squat control logic of the operation control block 110. A value for independently controlling the damping force of the first to fourth variable dampers is generated according to the calculated value transmitted from 119.

According to the calculated value of the damper control unit 120, the damping force of each damper in the first to fourth variable dampers and the actuators 131, 133, 135, and 137 is variable (considering the riding comfort of the passenger in the front passenger seat and the rear seat) and the four-wheel actuator Driven independently.

Therefore, the semi-active suspension system according to the present invention uses the detected values of the passenger and rear seat sensors 107 and 109 to ride comfort control logic 111, vehicle speed sensitive control logic 113, anti-roll control logic 115, anti-dive. By reflecting to the control logic 117 and the anti-squat control logic 119, the suspension state of the vehicle is controlled while taking into consideration the riding comfort of the passenger in the passenger seat and the rear seat.

As described above, the present invention provides a variable damper and actuator that is equipped with a sensor that detects the position information of a person in the passenger seat and the rear seat of the vehicle and is independently connected to the four wheels of the vehicle using the detection value of the sensor. By controlling the variable damping force, the ride comfort of the passenger in the front passenger seat and the rear seat is controlled to achieve a high ride comfort and running stability.

On the other hand, the present invention is not limited to the above-described embodiment, various modifications are possible by those skilled in the art within the spirit and scope of the present invention described in the claims to be described later.

Claims (1)

A first logic that detects a value of at least three-wheel vertical acceleration sensors to control ride comfort, a second logic that detects a vehicle speed sensor to control vehicle speed response, and detects the vehicle speed sensor and a steering angle sensor to adjust the roll for damping force adjustment. A third logic to control, a fourth logic to detect the vehicle speed sensor and a brake sensor, and a fourth logic to control the damping force adjustment dive, and a fifth logic to control the damping force adjustment squat by detecting the trolley position monitoring sensor. In a vehicle having a control unit of a semi-active suspension system for independently controlling the variable damping force of the variable damper and the actuator connected to the four wheels of the vehicle, respectively, A pressure sensor is installed at the passenger seat and the rear seat of the vehicle, and the values detected by the pressure sensors of the passenger seat and the rear seat are input to the first to fifth logic, and the control unit according to the output values of the first to fifth logic. Semi-active suspension system of the vehicle, characterized in that to independently control the variable damping force of the variable damper and the actuator of the four-wheel so that the comfort of the passenger seat and the rear seat.