TWI579172B - Electric vehicle intelligent brake system - Google Patents

Description

Smart car brake system for electric vehicles

The present invention relates to the related art of electric vehicles, and more particularly to an intelligent brake system for an electric vehicle.

Oil is the main source of power for most vehicles today. However, due to the excessive development and use of oil in recent years, the global climate and its content have dropped sharply, so people have begun to realize the need to find alternative energy sources as a source of power for vehicles. As a result, electric vehicles using electricity as a source of power have emerged.

In general, the braking process of an electric vehicle can be at least divided into: a pedal car process and a motor braking process. When you brake, you will first release the accelerator pedal and then step on the brake pedal. The release of the accelerator pedal causes the motor generator to generate a load torque to brake the electric vehicle. This process is called a motor brake process. During the pedaling of the brake pedal, the force of the pedaling will be transmitted to the brake disc in the order of the brake master cylinder, the brake cylinder, and the brake cylinder, and the blade will be frictionally rubbed against the wheel drum (or disk) of the wheel. Electric car brakes, this process is called the pedal car process.

Based on the current design of electric vehicles, the pedaling process and the motor braking process are two irrelevant processes, so the two cannot jointly coordinate the power required for the overall braking process of the electric vehicle, resulting in a rather uneven ride of the electric vehicle as a whole. In-car driving and/or passengers are prone to high head rate when driving, and feel uncomfortable, and the moment when the motor brake force is suddenly supplied, the wheel slips due to locking.

For the sake of the job, the development of a brake system for electric vehicles, which at least allows the pedaling process and the motor braking process to cooperate with each other, and makes the overall braking process of the electric vehicle smooth, and is indeed a manufacturer engaged in the relevant technical field of the present invention and/or Or one of the topics actively addressed by people.

It is an object of the present invention to provide a brake system for an electric vehicle that can impart a smooth overall braking process to the electric vehicle by controlling the mechanical braking force, thereby reducing the high head rate and/or the high rate generated by the driver while driving in the vehicle. Comfort.

To achieve the above and/or other objects, the present invention provides an intelligent brake system for an electric vehicle, comprising at least: a brake pedal, a brake master cylinder, a hydraulic sensor, an electronic control component, and a motor Motor. The brake pedal is used to pedal the electric vehicle when it is stepped on. The brake master cylinder is connected to the brake pedal, and is used to push the oil body used by the hydraulic brake when the pedal truck is hydraulically braked. The oil pressure sensor is connected to the brake master cylinder to receive the pressure generated by the pushed oil body. The electronic control component is connected to the oil pressure sensor to receive the pressure received by the oil pressure sensor and converted into a signal value. The motor generator is connected to the electronic control unit to determine the power of the motor brake for the electric vehicle based on the signal value.

According to the invention, since the motor generator can determine the power of the electric vehicle to brake the electric vehicle according to the signal value, and the signal value is converted by the pressure generated by the driven oil body, the power of the motor brake can be pushed by itself. The pressure generated by the oil body matches the force of the pedal car. Through this mode, the overall braking process of the electric vehicle can be allowed to be smooth, and the driving rate in the vehicle and/or the nodding rate and discomfort of the passenger when braking can be reduced.

In order to make the above and/or other objects, functions and features of the present invention more comprehensible, the following detailed description of the preferred embodiments and the accompanying drawings

Please refer to FIG. 1 , which illustrates a smart brake system according to an embodiment of the present invention. The brake system is used for an electric vehicle. The brake system of the present embodiment includes the following components: a brake pedal (1), a brake master cylinder (2), an oil pressure sensor (3), an electronic control component (4), and a first motor generator ( 5), and a second motor generator (6).

The brake pedal (1) can pedal the electric vehicle when it is stepped on. In detail, the force generated when the pedal (1) is stepped on can make the pieces of the wheels (L11, L21, R11, R21) and the drums (or discs) of the wheels (L12, L22, R12, R22). Rubbing to pedal the electric car.

The brake master cylinder (2) is connected to the brake pedal (1), which can push the oil body used by the hydraulic brake when the pedal truck is hydraulically braked. In addition, the hydraulic brake is familiar to those skilled in the art, and therefore will not be described herein.

The oil pressure sensor (3) is connected to the brake master cylinder (2) and can receive the pressure generated by the pushed oil body. Therefore, the oil pressure sensor (3) can obtain the force generated when the pedal (1) is stepped on by receiving the pressure generated by the pushed oil body.

The electronic control component (4) is connected to the oil pressure sensor (3) and can receive the pressure received by the oil pressure sensor (3) and convert it into a signal value. In general, the electronic control component (4) is written with a specific program that can achieve the conversion of the signal value, and whether the deceleration generated by the sum of the power of the motor brake and the pedal car described below is satisfactory for the vehicle as a whole. Speed assessment.

The first motor generator (5) and the second motor generator (6) are connected to the electronic control unit (4), and the motor generators (5, 6) can determine the motor brake for the electric vehicle according to the signal value. the power of. Specifically, when the brake pedal (1) is stepped on, the accelerator pedal (not shown) is naturally released at this time, and the motor generators (5, 6) can generate load torque to reach the motor brake. However, this embodiment is unique in that the power of the motor brake is determined by the signal value converted from the pressure generated by the oil body driven by the brake master cylinder (2), so that the power of the motor brake can be transmitted through The pressure generated by the propelled oil body matches the strength of the pedal car.

As shown in FIG. 2, the first motor generator (5) is provided with an automatic hand shift transmission (51), and the second motor generator (6) is connected to the automatic manual transmission (51) and has a fixed gear ratio. . The present inventors have proposed such a combination in the invention patent of the Republic of China Bulletin No. I428247, and this combination can raise and lower the automatic hand shift transmission (51) without a clutch, so how does the combination proceed? The ascending and descending positions of the automatic hand-gear transmission (51) can be referred to the aforementioned patents, and will not be described herein. As shown in Fig. 1, the first motor generator (5) and the second motor generator (6) first transmit the power of the motor brake to the electronic control unit (4), and the electronic control unit (4) can be further driven by the motor. The sum of the power and the strength of the pedal car is used to assess whether the deceleration generated by the force of the second car is equal to the expected deceleration of the vehicle. If the evaluation is less than, the electronic control unit (4) can transmit another signal value to the first motor generator (5) and the second motor generator (6) to downshift the automatic hand gearbox (51). In this way, the power of the motor brake for the electric vehicle can be compensated.

It should be noted that, in the embodiment, if the purpose of compensating for the braking force of the motor is not achieved, the combination of the first motor generator (5) and the second motor generator (6) can be any conventional motor generator. Replace.

Please refer to FIG. 1 and FIG. 3 again to further illustrate the process of using the brake system to perform the overall braking of the electric vehicle as follows:

The operator first releases the accelerator pedal and pedals the brake pedal (1). At this time, the force generated when the pedal (1) is stepped on is pushed by the pressure master cylinder (2) to push the oil body used by the pedal car (that is, the hydraulic brake), thereby allowing the wheel to be ordered (L11, L21). , R11, R21) rubbing against the drum (or disc) (L12, L22, R12, R22) of the wheel. In this way, the pedal car can be reached.

In addition, the pressure generated by the pushed oil body is received by the oil pressure sensor (3), and the pressure received by the oil pressure sensor (3) is transmitted to the electronic control unit (4). The electronic control element (4) then calculates the pressure and converts it into a signal value. After the first motor generator (5) and the second motor generator (6) receive the signal value, the motor generators (5, 6) generate load torque and determine the motor brake for the electric vehicle according to the signal value. the power of.

If the vehicle is on a special section of the following slope, the sum of the power of the motor brake and the pedal vehicle may not be able to achieve the overall braking process of the electric vehicle. Therefore, the motor generators (5, 6) will feed back the power of the motor brake to the electronic control unit (4), and the electronic control unit (4) recalculates whether the deceleration generated by the force of the two vehicles is equal to the overall vehicle. The expected deceleration of the brakes. If the deceleration generated is lower than the expected deceleration, the electronic control unit (4) transmits another signal value to the first motor generator (5) and the second motor generator (6) to allow the automatic hand gearbox ( 51) Downshift. In this way, the power of the motor brake for the electric vehicle can be compensated. Conversely, if the deceleration generated is equal to the expected deceleration, the electronic control unit (4) does not transmit the other signal value to the first motor generator (5) and the second motor generator (6).

In summary, when the pedal (1) is stepped on, not only the pedal car can be used for the electric vehicle, but also the pressure generated by the oil body that pushes the pedal car (that is, the hydraulic brake) can be converted into a signal value and transmitted. To the motor generator (5, 6). The motor generator (5, 6) can judge the power of the electric vehicle to brake the motor according to the signal value. In this way, the power of the motor brake can be matched with the strength of the pedal car, thereby providing smoothness of the overall braking process of the electric vehicle and reducing the nodding rate and discomfort of the driving in the vehicle and/or the passenger when braking.

Although the present invention has been disclosed in its preferred embodiments, it is not intended to limit the invention, and the invention may be modified by those skilled in the art without departing from the spirit and scope of the invention. The scope of the present invention is intended to be in accordance with the scope of the appended claims.

1‧‧‧ brake pedal
2‧‧‧ brake master cylinder
3‧‧‧Hydraulic sensor
4‧‧‧Electronic control components
5‧‧‧First motor generator
51‧‧‧Automatic hand gearbox
6‧‧‧Second motor generator
L11‧‧‧Left front wheel
L12‧‧‧Left front wheel drum (or disc)
L21‧‧‧ Left rear wheel
L22‧‧‧Left rear wheel drum (or disc)
R11‧‧‧Right front wheel
R12‧‧‧Right front wheel drum (or disc)
R21‧‧‧Right rear wheel
R22‧‧‧Right rear wheel drum (or disc)

1 is a schematic view showing an intelligent brake system of an electric vehicle according to an embodiment of the present invention. 2 is a schematic view showing the first motor generator and the second motor generator of the smart brake system of FIG. 1. FIG. 3 is a flow chart illustrating the overall braking process of the electric vehicle of FIG. 1.

1‧‧‧ brake pedal

2‧‧‧ brake master cylinder

3‧‧‧Hydraulic sensor

4‧‧‧Electronic control components

5‧‧‧First motor generator

51‧‧‧Automatic hand gearbox

6‧‧‧Second motor generator

L11‧‧‧Left front wheel

L12‧‧‧Left front wheel drum (or disc)

L21‧‧‧ Left rear wheel

L22‧‧‧Left rear wheel drum (or disc)

R11‧‧‧Right front wheel

R12‧‧‧Right front wheel drum (or disc)

R21‧‧‧Right rear wheel

R22‧‧‧Right rear wheel drum (or disc)

Claims (1)

An intelligent brake system for an electric vehicle includes: a brake pedal for pedaling the electric vehicle when being stepped on; a brake master cylinder connected to the brake pedal for the pedal vehicle When the vehicle is hydraulically braked, the oil body used in the hydraulic brake is pushed; a hydraulic pressure sensor is connected to the brake master cylinder to receive the pressure generated by the driven oil body; an electronic control unit Connected to the oil pressure sensor to receive the pressure received by the oil pressure sensor and converted into a signal value; a first motor generator is connected to the electronic control unit to determine the pair according to the signal value a power of the motor brake carried by the electric vehicle; and a second motor generator connected to the electronic control unit to determine the power of the motor brake for the electric vehicle according to the signal value; wherein the first The motor generator is configured with an automatic hand shift transmission, and the second motor generator is coupled to the automatic manual transmission and has a fixed gear ratio; thereby, the first motor generator and the second motor generate electricity After transmitting the power of the motor brake to the electronic control unit, the electronic control unit evaluates the deceleration of the electric vehicle by the force of the motor brake and the pedal vehicle according to the sum of the power of the motor brake and the power of the pedal vehicle. Is it equal to the expected deceleration of the overall braking of the electric vehicle; if the evaluation is less than, the electronic control unit transmits another signal value to the first motor generator and the second motor generator to allow the automatic hand shifting The box is downshifted to compensate for the power of the motor brakes on the electric vehicle.