Active suspension system for commercial vehicle cab

Abstract

The invention relates to an active suspension system for a commercial vehicle cab. An integrated front air bag and an integrated rear air bag are each provided with a height valve and a shock absorber in an integrated mode, and a non-integrated rear air bag is provided with a shock absorber in an integrated mode. Each of the integrated front airbag, the integrated rear airbag and the non-integrated rear airbag comprises a first air inlet, a second air inlet, an exhaust port and an electromagnetic control valve; second air inlets of the two integrated front air bags are connected with a second air inlet of the integrated rear air bag in parallel and connected with an air source, and a second air inlet of the integrated rear air bag is connected with a second air inlet of the non-integrated rear air bag in series. First air inlets of the two integrated front air bags, a first air inlet of the integrated rear air bag and a first air inlet of the non-integrated rear air bag are connected in parallel and are connected with a flow control valve, and the flow control valve is arranged on an air source; the electromagnetic control valve and the flow control valve are both in communication connection with the active suspension system controller.

Description

Technical Field

[0001] This invention relates to the field of commercial vehicle technology, and more particularly to an active suspension system for a commercial vehicle cab. Background Technology

[0002] With the continuous development of intelligent technology in new energy commercial vehicles, users are demanding higher levels of comfort from heavy-duty commercial vehicles. Heavy-duty commercial vehicle cab suspensions are primarily passive four-point suspensions, including four-point hydraulic suspensions and four-point air suspensions. Four-point air suspensions utilize air springs with integrated height valves and external air springs; some models even employ a separate structure for the air spring and shock absorber. However, passive cab suspensions suffer from the following problems: due to the non-adjustable stiffness and damping of their shock absorbers, they cannot effectively handle complex operating conditions and driving behaviors. Some heavy-duty commercial vehicle cab suspensions also employ semi-active cab suspensions, mainly using two types of shock absorbers: continuously adjustable damping dampers (CDC) and magnetorheological dampers (MRC), adjusting damping based on chassis vibration feedback. However, semi-active cab suspensions also have the following problems: they cannot meet the needs of users in more diverse operating conditions. Summary of the Invention

[0003] The purpose of this invention is to provide an active suspension system for commercial vehicle cabs that addresses the shortcomings of existing technologies.

[0004] This invention is achieved using the following technical solution: An active suspension system for a commercial vehicle cab includes an airbag assembly and an active suspension system controller; The airbag assembly includes two integrated front airbags, an integrated rear airbag, and a non-integrated rear airbag; both the integrated front airbag and the integrated rear airbag are integrated with a height valve and a shock absorber, and the non-integrated rear airbag is integrated with a shock absorber. The integrated front airbag, the integrated rear airbag, and the non-integrated rear airbag all include a first air inlet, a second air inlet, an exhaust outlet, and an electromagnetic control valve. The second air inlets of the two integrated front airbags are connected in parallel with the second air inlet of the integrated rear airbag and connected to an air source. The second air inlet of the integrated rear airbag and the second air inlet of the non-integrated rear airbag are connected in series. The first air inlets of the two integrated front airbags, the first air inlet of the integrated rear airbag, and the first air inlet of the non-integrated rear airbag are connected in parallel and connected to a flow control valve, which is installed on the air source; both the electromagnetic control valve and the flow control valve are communicatively connected to the active suspension system controller.

[0005] As a further illustration of the invention, an acceleration sensor is also included; The four acceleration sensors are respectively installed at the lower mounting points near the two integrated front airbags, the integrated rear airbag, and the non-integrated rear airbag; the acceleration sensors are communicatively connected to the active suspension system controller.

[0006] As a further explanation of the invention, lidar is also included; The lidar is installed at the front end of the cab roof and is communicatively connected to the active suspension system controller.

[0007] As a further illustration of the invention, it also includes a vehicle controller; The vehicle controller is communicatively connected to the active suspension system controller.

[0008] As a further illustration of the invention, both the active suspension system controller and the flow control valve are located in the vehicle chassis.

[0009] As a further illustration of the invention, a power source is also included; said power source provides power to the active suspension system of the commercial vehicle cab.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects: 1. By applying this active suspension technology solution, adjustments can be made continuously based on road condition information, which can effectively improve the ride comfort of the entire vehicle; 2. By applying this active suspension technology, the pitch angle under braking conditions and the cab roll angle during steering can be effectively improved. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the system structure of the present invention; Figure 2 This is a schematic diagram of the airbag assembly structure of the present invention.

[0012] In the diagram, 1. Active suspension system controller; 21. Integrated front airbag; 22. Integrated rear airbag; 23. Non-integrated rear airbag; 3. LiDAR; 4. Vehicle controller; 5. Accelerometer; 6. Flow control valve; 7. Air source; 8. Power supply; 211. First air intake; 212. Second air intake; 213. Exhaust port; 214. Electromagnetic control valve. Detailed Implementation

[0013] like Figure 1-2 As shown, a commercial vehicle cab active suspension system includes an airbag assembly and an active suspension system controller 1; The airbag assembly includes two integrated front airbags 21, an integrated rear airbag 22, and a non-integrated rear airbag 23; both the integrated front airbag 21 and the integrated rear airbag 22 are equipped with height valves and shock absorbers, while the non-integrated rear airbag 23 is equipped with shock absorbers. The integrated front airbag 21, the integrated rear airbag 22, and the non-integrated rear airbag 23 all include a first air inlet 211, a second air inlet 212, an exhaust outlet 213, and an electromagnetic control valve 214. The second air inlets 212 of the two integrated front airbags 21 are connected in parallel with the second air inlet 212 of the integrated rear airbag 22 and connected to the air source 7. The second air inlet 212 of the integrated rear airbag 22 and the second air inlet 212 of the non-integrated rear airbag 23 are connected in series. The first air inlets 211 of the two integrated front airbags 21, the first air inlet 211 of the integrated rear airbag 22, and the first air inlet 211 of the non-integrated rear airbag 23 are connected in parallel and connected to the flow control valve 6; the flow control valve 6 is located on the air source 7; both the electromagnetic control valve 214 and the flow control valve 6 are communicatively connected to the active suspension system controller 1. The first air inlets 211 of the four airbags are connected in parallel and then connected to the flow control valve 6 to meet the rapid inflation requirements under specific working conditions.

[0014] It also includes an accelerometer sensor 5; Four acceleration sensors 5 are respectively installed near the lower mounting points of the two integrated front airbags 21, the integrated rear airbag 22, and the non-integrated rear airbag 23; the acceleration sensors 5 are communicatively connected to the active suspension system controller 1. The acceleration sensors 5 are used to collect vibrations filtered by the tires and suspension in real time, and feed the vibration information back to the active suspension system controller 1. The active suspension system controller 1 adjusts the damping force of the shock absorbers in real time through the electromagnetic control valves 214 of the four shock absorbers according to a calibrated algorithm.

[0015] It also includes LiDAR 3; The lidar 3 is installed at the front of the cab roof and is communicatively connected to the active suspension system controller 1. The active suspension system controller 1 continuously receives road condition information scanned by the lidar 3 during commercial vehicle operation, including speed bumps, potholes, etc., and can quickly model the information.

[0016] It also includes the vehicle controller 4; The vehicle controller 4 is connected to the active suspension system controller 1.

[0017] To meet the requirements of driving comfort and operational stability under specific operating conditions, during braking, the active suspension system controller 1 receives vehicle speed, pedal braking force, and pedal travel information from the vehicle controller 4. According to the calibration algorithm, the electromagnetic control valve 214 of the airbag assembly instantaneously increases the compression damping of the front suspension shock absorber and decreases the tension damping of the rear suspension shock absorber, thereby controlling the pitch angle of the cab. At the same time, the flow control valve 6 receives the flow control information from the active suspension system controller 1, opens the flow control valve of the front suspension airbag, instantaneously increases the air intake, improves the airbag stiffness, reduces the airbag compression, and reduces the cab pitch angle.

[0018] Under steering conditions, the active suspension system controller 1 receives vehicle speed and steering wheel angle information from the vehicle controller 4. According to the calibration algorithm, the electromagnetic control valve 214 of the airbag assembly instantaneously increases the compression damping of the inner shock absorber and decreases the tension damping of the outer shock absorber to control the roll angle of the cab. At the same time, the flow control valve 6 receives the flow control information from the active suspension system controller 1, opens the flow control valve of the inner airbag, instantaneously increases the air intake, improves the airbag stiffness, reduces the airbag compression, and reduces the cab roll.

[0019] To demonstrate energy-saving performance, when the vehicle speed is below a certain speed, the active suspension system controller 1 does not trigger damping and flow control information; when the vehicle speed exceeds the certain speed, it executes the calibrated control strategy.

[0020] Both the active suspension system controller 1 and the flow control valve 6 are located on the vehicle chassis.

[0021] It also includes power supply 8; power supply 8 provides power to the active suspension system of the commercial vehicle cab.

Claims

1. A commercial vehicle cab active suspension system, characterized in that: Includes airbag assembly and active suspension system controller; The airbag assembly includes two integrated front airbags, an integrated rear airbag and a non-integrated rear airbag; the integrated front airbag and the integrated rear airbag are both integrated with a height valve and a shock absorber, and the non-integrated rear airbag is integrated with a shock absorber; The integrated front airbag, the integrated rear airbag and the non-integrated rear airbag each include a first air inlet, a second air inlet, an exhaust port and an electromagnetic control valve; The second air inlets of the two integrated front airbags are connected in parallel with the second air inlet of the integrated rear airbag and are connected to an air source, and the second air inlet of the integrated rear airbag and the second air inlet of the non-integrated rear airbag are connected in series; The first air inlets of the two integrated front airbags, the first air inlet of the integrated rear airbag and the first air inlet of the non-integrated rear airbag are connected in parallel and connected to a flow control valve, and the flow control valve is arranged on the air source; the solenoid control valve and the flow control valve are both communicatively connected to the active suspension system controller.

2. The commercial vehicle cab active suspension system according to claim 1, characterized in that: Also includes an acceleration sensor; The four acceleration sensors are respectively arranged at lower mounting points close to the two integrated front airbags, the integrated rear airbag and the non-integrated rear airbag; the acceleration sensors are communicatively connected with the active suspension system controller.

3. The commercial vehicle cab active suspension system according to claim 2, characterized in that: It also includes LiDAR; The laser radar is arranged at the front end of the cab roof, and the laser radar is communicatively connected with the active suspension system controller.

4. The commercial vehicle cab active suspension system according to claim 3, characterized in that: Also includes vehicle controller; The vehicle controller is communicatively connected with the active suspension system controller.

5. The commercial vehicle cab active suspension system according to claim 1, characterized in that: The active suspension system controller and the flow control valve are both arranged on the vehicle chassis.

6. The commercial vehicle cab active suspension system according to claim 1, characterized in that: It also includes a power supply; the power supply provides power for the active suspension system of the commercial vehicle cab.

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