EMB (Electro-Mechanical Braking) control system of electric automobile and control method thereof
A control system and electric vehicle technology, applied in electric vehicles, electric braking systems, vehicle components, etc., can solve problems such as slow braking response, achieve good noise attenuation performance, avoid difficult measurement, and reduce sensitivity
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Embodiment 1
[0080] refer to figure 1 , figure 2 and image 3 , an EMB control system for an electric vehicle, comprising a CAN bus, a primary node control system and four secondary node control systems, the four secondary node control systems are respectively used to control the braking of four wheels.
[0081] The first-level node control system includes an electronic brake pedal, a signal acquisition module, an AD converter, a first-level microcontroller and a first-level CAN bus transceiver.
[0082] The signal acquisition module includes a counter stamping acquisition unit, a displacement sensor and a speed sensor. The counter stamping acquisition unit is used to acquire the rotational speed of the engine and the wheel speed of the wheels. The displacement sensor is used to collect the travel signal of the electronic brake pedal; the speed sensor is used to collect the stepping speed signal of the electronic brake pedal.
[0083] The signal acquisition module transmits the collecte...
Embodiment 2
[0089] On the basis of embodiment one, embodiment two further optimizes and limits the content in embodiment one:
[0090] Both the first-level microcontroller and the second-level microcontroller use the STM32 microcontroller, and the first-level microcontroller and the second-level microcontroller use the STM32F103 embedded chip integrated with the bxCAN controller. The circuit structure of the STM32 chip refers to Figure 4 .
[0091] refer to Figure 5 , CAN bus architecture is mainly divided into three layers: application layer, data link layer and physical layer. Among them, the physical layer is the circuit that realizes the connection between ECU (vehicle single-chip microcomputer, electronic control unit) and the bus, and the total number of ECUs depends on the power load of the bus.
[0092] The CAN bus interface circuit design is mainly designed for the physical layer, and its controller mainly realizes the work of the data link layer in the CAN bus protocol. Sinc...
Embodiment 3
[0097] On the basis of the above-mentioned embodiments, the third embodiment further optimizes and limits the content in the above-mentioned embodiments:
[0098] refer to Figure 6 , the counter modulus acquisition unit includes a magnetoelectric sensor, an optical isolator and a voltage comparator; the optical isolator converts the wheel speed electrical signal collected by the magnetoelectric sensor into an optical signal, and the optical signal is converted into a pulse signal through the voltage comparator; The stage node control system also includes a potentiometer connected to the inverting input terminal of the voltage comparator.
[0099] In the process of sampling the wheel speed, the output signal must be conditioned by the magnetic sensor. The conditioning circuit is mainly used to adjust the sinusoidal signal output by the magnetoelectric sensor to an external counting pulse that can be recognized by STM32, and the electrical signal is converted into an optical s...
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