WO2023029797A1

WO2023029797A1 - Chassis structure of electric bus, and steering method

Info

Publication number: WO2023029797A1
Application number: PCT/CN2022/106955
Authority: WO
Inventors: 高嘉利; 杨海; 陈国华
Original assignee: 浙江中车电车有限公司
Priority date: 2021-08-31
Filing date: 2022-07-21
Publication date: 2023-03-09
Also published as: WO2023029177A1; CN113771944A

Abstract

Disclosed in the present invention are a chassis structure of an electric bus, and a steering method. The chassis structure comprises: a frame; a first axle, which is arranged on the front end of the frame, wherein the first axle comprises a first bus axle and a first steering rod, and the first steering rod is connected to wheels on the first bus axle and is used for driving the wheels on the first bus axle to turn; and a second axle and a third axle, which are arranged on the tail end of the frame, wherein the third axle is located on one side of the second axle that is close to the first axle, the second axle comprises a second bus axle and a second steering rod, and the second steering rod is connected to wheels on the second bus axle and is used for driving the wheels on the second bus axle to turn. According to the present application, the second axle is additionally arranged on the frame of the electric bus to serve as a follow-up axle for assisting steering, so that the driving stability and flexibility of the electric bus are improved.

Description

A chassis structure and steering method of an electric passenger car

technical field

The invention relates to the technical field of electric passenger cars, in particular to a chassis structure and a steering method of an electric passenger car.

Background technique

Compared with fuel vehicles, new energy vehicles, such as electric buses, have added a lot of battery packs to provide energy, resulting in a significant increase in the weight of the vehicle, making electric buses more cumbersome. When driving at low speed, the turning radius is large and inflexible; when driving at high speed, the center of gravity is high and the vehicle is unstable.

Contents of the invention

In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to propose a chassis structure and a steering method of an electric bus to solve the above-mentioned problems.

The technical solution adopted by the present invention to solve the technical problems is a chassis structure of an electric passenger car, comprising:

frame;

a first axle, which is arranged at the front end of the vehicle frame, the first axle includes: a first axle and a first steering rod, the first steering rod is connected to the wheels on the first axle, for driving wheels on said first axle to steer;

The second axle and the third axle are arranged at the end of the vehicle frame, the third axle is on the side of the second axle close to the first axle, the second axle The axle includes a second axle and a second steering rod connected to the wheels on the second axle for driving the wheels on the second axle to turn.

Further, the first axle, the second axle and the third axle are all provided with shock-absorbing airbags.

Further, one wheel is respectively provided at both ends of the first axle and the second axle, and two wheels are respectively arranged at both ends of the third axle.

Further, the length of the chassis structure is 12.7 meters.

Further, the present invention also discloses a steering method for an electric bus, which is applied to the chassis structure of the above-mentioned electric bus, including steps:

S1, driving the wheels on the first axle to turn;

S2. Collect the vehicle speed of the electric bus in real time, and compare the current vehicle speed with the preset vehicle speed value. When it is determined that the current vehicle speed is less than the preset vehicle speed value, perform step S3; when it is determined that the current vehicle speed is greater than or equal to the preset vehicle speed value, perform step S2. S4;

S3. Driving the wheels on the second axle to turn, and make the steering direction opposite to the turning direction of the wheels on the first axle;

S4. Driving the wheels on the second axle to turn in the same direction as the wheels on the first axle.

Further, the ratio of the steering angle of the wheels on the second axle to the steering angle of the wheels on the first axle is X;

When the current speed of the electric bus is greater than or equal to the preset speed value, X increases with the increase of the current speed.

Further, it also includes: collecting the steering angle Y of the wheels on the first axle in real time, and making X increase as Y increases.

Further, in step S3, 0<X<0.3 is set.

Further, in step S3, the maximum rotation angle of the wheels on the first axle is 38°, and the maximum rotation angle of the wheels on the second axle is 11°.

Compared with the prior art, the present invention has at least the following beneficial effects:

1. A second axle is added to the frame of the electric bus to assist steering and improve the driving stability and flexibility of the electric bus.

2. When the speed of the electric bus is low, the steering direction of the second axle is opposite to that of the first axle, thereby reducing the turning radius of the electric bus to improve its flexibility; when the speed of the electric bus is high , the steering direction of the second axle is the same as that of the first axle.

3. The steering angle of the second axle increases with the increase of the steering angle of the first axle at the vehicle speed, and, as the current vehicle speed increases, the proportion of the increase increases, and the speed-dependent gain realizes the vehicle at It can maintain good stability and handling at different speeds.

4. The steering angle of the second axle increases with the increase of the steering angle of the first axle at the vehicle speed, and, with the increase of the steering angle of the first axle, the greater the ratio of the increase, the realization The vehicle can maintain good handling and stability at any steering angle.

Description of drawings

Fig. 1 is the schematic diagram of the chassis structure of electric passenger car in the embodiment;

Fig. 2 is the structural representation of the first axle in the embodiment;

Fig. 3 is the structural representation of the second axle in the embodiment;

In the picture:

100, frame;

200, the first axle; 210, the first axle; 220, the first steering rod;

300, the second axle; 310, the second axle; 320, the second steering rod;

400. The third axle.

Detailed ways

The following are specific embodiments of the present invention and in conjunction with the accompanying drawings, the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

Please refer to Fig. 1-Fig. 3, the present invention discloses a kind of chassis structure of electric bus, comprising:

frame 100;

The first axle 200, which is arranged at the front end of the vehicle frame 100, the first axle 200 includes: a first axle 210 and a first steering rod 220, and the first steering rod 220 is connected to the first steering rod 220 The wheel connections on the axle 210 are used to drive the wheels on the first axle 210 to turn;

The second axle 300 and the third axle 400 are arranged at the end of the vehicle frame 100 , the third axle 400 is on the side of the second axle 300 close to the first axle 200 , the second axle 300 includes a second axle 310 and a second steering rod 320, the second steering rod 320 is connected with the wheels on the second axle 310 for driving the wheels on the second axle 310 The wheels turn.

Specifically, the first axle 200 is the front axle of the electric bus, used for leading steering; the second axle 300 is the follower axle of the electric bus, used for auxiliary steering; the third axle 400 is the drive axle of the electric bus, Used to drive electric passenger cars. In this embodiment, a second axle 300 is added to the frame 100 of the electric bus to assist steering and improve the driving stability and flexibility of the electric bus.

Further, the first axle 200 , the second axle 300 and the third axle 400 are all provided with shock-absorbing airbags.

Further, one wheel is respectively provided at both ends of the first axle 200 and the second axle 300 , and two wheels are respectively arranged at both ends of the third axle 400 .

The number of wheels of the first axle 200 and the second axle 300 are set to be the same, so that when the second axle 300 assists the steering of the first axle 200 , the assisting steering is better.

Further, the length of the chassis structure is 12.7 meters.

S1, driving the wheels on the first axle 200 to turn;

S3, driving the wheels on the second axle 300 to turn, and make the steering direction opposite to the turning direction of the wheels on the first axle 200;

S4. Driving the wheels on the second axle 300 to turn, and make the turning direction the same as the turning direction of the wheels on the first axle 200 .

Specifically, when the speed of the electric bus is low, the steering direction of the second axle 300 is opposite to that of the first axle 200, thereby reducing the turning radius of the electric bus to improve its flexibility. When the speed of the electric bus is high, the steering direction of the second axle 300 is the same as that of the first axle 200, thereby improving the stability and controllability during high-speed driving.

It should be noted that the sequence of steps S1-S4 is a logical sequence, not a temporal sequence, and the above steps occur simultaneously during actual driving.

In this embodiment, the preset vehicle speed value can be any value in the range of 20-45 km/h according to usage requirements.

Further, the ratio of the steering angle of the wheels on the second axle 300 to the steering angle of the wheels on the first axle 200 is X;

Specifically, the steering angle of the second axle 300 increases with the increase of the steering angle of the first axle 200 at the vehicle speed, and, as the current vehicle speed increases, the ratio of the increase increases, and the speed-dependent gain Realize that the vehicle can maintain good stability and controllability at different speeds.

Further, it also includes: collecting the steering angle Y of the wheels on the first axle 200 in real time, and making X increase as Y increases.

Specifically, the steering angle of the second axle 300 increases with the increase of the steering angle of the first axle 200 of the vehicle speed, and, with the increase of the steering angle of the first axle 200, the ratio of its increase The larger the value, the better the handling and stability of the vehicle at any steering angle.

Further, in step S3, 0<X<0.3 is set.

Further, in step S3, the maximum rotation angle of the wheels on the first axle 200 is 38°, and the maximum rotation angle of the wheels on the second axle 300 is 11°.

It should be noted that all parameters involved in the present invention are designed for an electric bus with a length of 12.7 meters.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relationship between the components in a certain posture (as shown in the accompanying drawings). Relative positional relationship, movement conditions, etc., if the specific posture changes, the directional indication will also change accordingly.

In addition, in the present invention, descriptions such as "first", "second", "one" and so on are used for descriptive purposes only, and should not be understood as indicating or implying their relative importance or implicitly indicating the indicated technical features quantity. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

In the present invention, unless otherwise specified and limited, the terms "connection" and "fixation" should be understood in a broad sense, for example, "fixation" can be a fixed connection, a detachable connection, or an integral body; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediary, and it can be an internal communication between two elements or an interaction relationship between two elements, unless otherwise clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In addition, the technical solutions of the various embodiments of the present invention can be combined with each other, but it must be based on the realization of those skilled in the art. When the combination of technical solutions is contradictory or cannot be realized, it should be considered as a combination of technical solutions. Does not exist, nor is it within the scope of protection required by the present invention.

Claims

A chassis structure of an electric passenger car is characterized in that it comprises:

frame;

a first axle, which is arranged at the front end of the vehicle frame, the first axle includes: a first axle and a first steering rod, the first steering rod is connected to the wheels on the first axle, for driving wheels on said first axle to steer;

The second axle and the third axle are arranged at the end of the vehicle frame, the third axle is on the side of the second axle close to the first axle, the second axle The axle includes a second axle and a second steering rod connected to the wheels on the second axle for driving the wheels on the second axle to turn.
The chassis structure of an electric passenger car according to claim 1, wherein shock-absorbing airbags are arranged on the first axle, the second axle and the third axle.
The chassis structure of an electric passenger car according to claim 1, wherein a wheel is respectively arranged at both ends of the first axle and the second axle, and two ends of the third axle are respectively Set up two wheels.
The chassis structure of an electric passenger car according to claim 1, wherein the length of the chassis structure is 12.7 meters.
A steering method for an electric passenger car, applied to the chassis structure of an electric passenger car according to any one of claims 1-4, characterized in that it comprises the steps of:

S1, driving the wheels on the first axle to turn;

S2. Collect the vehicle speed of the electric bus in real time, and compare the current vehicle speed with the preset vehicle speed value. When it is determined that the current vehicle speed is less than the preset vehicle speed value, perform step S3; when it is determined that the current vehicle speed is greater than or equal to the preset vehicle speed value, perform step S2. S4;

S3. Driving the wheels on the second axle to turn, and make the steering direction opposite to the turning direction of the wheels on the first axle;

S4. Driving the wheels on the second axle to turn in the same direction as the wheels on the first axle.
The steering method for an electric passenger car according to claim 5, wherein the ratio of the steering angle of the wheels on the second axle to the steering angle of the wheels on the first axle is X;

When the current speed of the electric bus is greater than or equal to the preset speed value, X increases with the increase of the current speed.
The steering method of an electric passenger car according to claim 6, further comprising: collecting the steering angle Y of the wheels on the first axle in real time, and increasing X with the increase of Y.
A steering method for an electric passenger car according to claim 6, characterized in that, in step S3, 0<X<0.3 is set.
A steering method for an electric passenger car according to claim 8, characterized in that, in step S3, the maximum turning angle of the wheels on the first axle is 38°, and the maximum turning angle of the wheels on the second axle is The rotation angle is 11°.