EMB braking system adopting permanent magnet synchronous motor and induction asynchronous motor

Abstract

The utility model belongs to the technical field of braking systems, and particularly relates to an EMB braking system adopting a permanent magnet synchronous motor and an induction asynchronous motor, which comprises a power supply module, a dual-motor driving module, an acquisition module and a control module, the dual-motor driving module can respectively control the permanent magnet synchronous motor and the induction asynchronous motor; the acquisition module is used for acquiring driving information, processing the driving information and transmitting the driving information to the control module; the control module enables the dual-motor driving module to start the induction asynchronous motor or the permanent magnet synchronous motor during braking according to the driving information; according to the driving information collected in real time, the state of a vehicle during braking is judged, so that different motors are started for braking, the permanent magnet synchronous motor can be used as a braking motor during ordinary driving, the induction asynchronous motor can be used as a standby motor, and when the permanent magnet synchronous motor breaks down, the induction asynchronous motor can be switched for braking; the service life of the permanent magnet synchronous motor is prolonged, and the driving safety is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to brake system technical field, concretely relates to a kind of EMB brake systems using permanent magnet synchronous and induction asynchronous double motor. BACKGROUND

[0002] EMB system is an advanced brake technology used in car and other vehicles, with high precision and response speed, its principle is that brake signal from driver is received by electronic control unit (ECU), ECU controls motor, motor drives brake caliper to clamp brake disc, thereby generating brake force.

[0003] However, existing EMB system generally adopts single type motor drive, when EMB system adopts permanent magnet synchronous motor, permanent magnet synchronous motor has higher power density and efficiency, but demagnetization problem can occur under high-speed heavy-load working condition, when EMB system adopts asynchronous motor, although induction asynchronous motor has simple structure, high reliability, stable high-speed performance and other advantages, but efficiency is relatively low. UTILITY MODEL CONTENTS

[0004] In order to overcome the deficiencies of prior art, the purpose of the utility model is to provide a kind of EMB brake system using permanent magnet synchronous and induction asynchronous double motor with long service life and high driving safety.

[0005] The technical scheme adopted by the utility model is as follows:

[0006] A kind of EMB brake system using permanent magnet synchronous and induction asynchronous double motor, characterized by:

[0007] Including double motor drive module, acquisition module, control module;

[0008] The double motor drive module can control permanent magnet synchronous motor and induction asynchronous motor to work respectively;

[0009] The acquisition module is used to collect driving information, and transmit driving information to control module after processing;

[0010] The control module adjusts the start priority of permanent magnet synchronous motor and induction asynchronous motor according to driving information, so that double motor drive module starts induction asynchronous motor or permanent magnet synchronous motor when braking.

[0011] Compared with prior art, the utility model has the beneficial effects that:

[0012] 1. According to the driving information collected in real time, the state of the vehicle brake is judged, so that different motors are started to brake, the permanent magnet synchronous motor can be used as the brake motor during ordinary driving, the induction asynchronous motor is used as the standby motor, when the permanent magnet synchronous motor fails, the induction asynchronous motor can be switched to brake, so that the driving safety is ensured.

[0013] 2. The permanent magnet synchronous motor is used for braking, the response is fast, and the braking efficiency is high, but the permanent magnet synchronous motor may appear demagnetization phenomenon under high temperature state or large impact and vibration, therefore, when the high speed heavy load or emergency brake, the temperature of the front wheel rapidly rises, the induction asynchronous motor is switched to brake, the induction asynchronous motor has large starting torque and can bear large load, and the induction asynchronous motor is suitable for high temperature environment, so that the emergency brake can be better coped with.

[0014] As a preferred embodiment of the utility model, the collection module includes a pedal position sensor, a motor temperature sensor, a vehicle speed sensor and a load sensor.

[0015] Beneficial effect: the pedal position sensor is used for detecting the brake pedal stroke, and can be used for the control module to judge whether it is emergency brake, the vehicle bus can detect the vehicle load and vehicle speed, and can be used for the control module to judge the inertia of the vehicle during driving, the motor temperature sensor is used for detecting the temperature of the permanent magnet synchronous motor, when the temperature is too high, the induction asynchronous motor is switched to brake, so that the demagnetization of the permanent magnet synchronous motor is avoided, and the induction asynchronous motor is switched to brake in time, so that the driving safety is ensured.

[0016] As a preferred embodiment of the utility model, the control module includes an MCU, and the double motor driving module includes a first three-phase bridge pre-driving chip, a second three-phase bridge pre-driving chip and a three-phase driving signal switching circuit.

[0017] When the permanent magnet synchronous motor is used for braking, the MCU transmits a control signal to the first three-phase bridge pre-driving chip, and the first three-phase bridge pre-driving chip starts the permanent magnet synchronous motor through a three-phase driving bridge.

[0018] When the induction asynchronous motor is used for braking, the MCU transmits a control signal to the three-phase driving signal switching circuit, the three-phase driving signal switching circuit transmits the control signal to the second three-phase bridge pre-driving chip, and the second three-phase bridge pre-driving chip starts the induction asynchronous motor through a three-phase driving bridge.

[0019] Beneficial effects: the first three-phase bridge pre-drive chip receives the control signal of the MCU, and converts the control signal into a three-phase alternating current signal suitable for driving the permanent magnet synchronous motor; the three-phase drive bridge is used for amplifying the signal output by the first three-phase bridge pre-drive chip, so that enough current is ensured to drive the permanent magnet synchronous motor; when the induction asynchronous motor is used for braking, the control signal of the MCU is only transmitted to the second three-phase bridge pre-drive chip, so that the induction asynchronous motor is controlled, and the switching of the two motors is realized.

[0020] As a preferred embodiment of the utility model, when the vehicle is in a normal braking state and the vehicle running inertia does not exceed a preset value, the control module controls the permanent magnet synchronous motor to brake;

[0021] When the vehicle is in a normal braking state and the vehicle running inertia exceeds a preset value, the control module controls the induction asynchronous motor to brake.

[0022] When the vehicle is in an emergency braking state, the control module controls the induction asynchronous motor to brake.

[0023] Beneficial effects: when the emergency brake or the vehicle inertia is large, the brake part needs to bear a large load, and during the braking process, the brake part is rapidly heated; the induction asynchronous motor is used for braking, so that the permanent magnet synchronous motor is prevented from demagnetizing due to high temperature and high load.

[0024] As a preferred embodiment of the utility model, the MCU judges whether the permanent magnet synchronous motor needs to be stopped and switches the induction asynchronous motor to brake according to the current change of the dual-motor drive module and the temperature of the permanent magnet synchronous motor.

[0025] Beneficial effects: when the current change of the dual-motor drive module is abnormal, it indicates that the permanent magnet synchronous motor is faulty, and the induction asynchronous motor is switched to brake to ensure driving safety; when the temperature of the permanent magnet synchronous motor is too high, the induction asynchronous motor is switched to brake to prevent the permanent magnet synchronous motor from demagnetizing.

[0026] As a preferred embodiment of the utility model, the power module comprises a power management chip, and a surge protection unit and a power filter unit are sequentially arranged between the vehicle power supply system and the power management chip.

[0027] Beneficial effects: the power management chip is responsible for managing small current power supply (various sensors and three-phase bridge pre-drive chips); the surge protection unit can protect the system from voltage surges; and the power filter unit filters noise and ripple in the power supply, so that a more stable power supply is provided for small current power supply.

[0028] As a preferred embodiment of the utility model, the controller of the induction asynchronous motor is externally mounted on the chassis.

[0029] Beneficial effect: the EMB caliper will be heated rapidly during braking, the controller of the induction asynchronous motor is installed on the chassis, instead of being integrated on the EMB caliper, thereby further reducing the risk of overheat. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a circuit principle diagram of the EMB braking system embodiment of the permanent magnet synchronous and induction asynchronous dual-motor of the utility model. DETAILED DESCRIPTION

[0031] The typical embodiments embodying the features and advantages of the utility model will be described in detail in the following description. It should be understood that the utility model can have various changes on different embodiments, which are all within the scope of the utility model, and the description and drawings in essence are used for description, not for limiting the utility model.

[0032] In the description of the present application, the terms "first", "second", "one side" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the structure referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the present application.

[0033] Referring to Figure 1 The EMB braking system of the utility model adopts permanent magnet synchronous and induction asynchronous dual-motor, which comprises a power module, a dual-motor driving module, an acquisition module and a control module.

[0034] The power module comprises a power management chip (model TLF35584), and a surge protection unit and a power filter unit are sequentially arranged between the vehicle power supply system and the power management chip, the power management chip supplies power for loads of 5V and below, and the output end of the vehicle power supply system is sequentially connected with the surge protection unit and an EMC filter, and the three-phase driving bridge is supplied with power.

[0035] The control module adopts an MCU (model Aurix TC234L), and the vehicle power supply system is connected with a voltage dividing circuit, the voltage dividing circuit is connected with the power management chip and the MCU respectively, after the vehicle power supply system is ignited, the ignition signal can be transmitted to the power management chip and the MCU respectively, so as to start the brake system.

[0036] The double-motor drive module comprises a first three-phase bridge pre-drive chip, a second three-phase bridge pre-drive chip and a three-phase drive signal switching circuit. The MCU communicates with the first three-phase bridge pre-drive chip in both directions, transmits a control signal to the first three-phase bridge pre-drive chip, amplifies the voltage through the first three-phase bridge pre-drive chip, drives the permanent magnet synchronous motor to work through the corresponding three-phase drive bridge, controls the three-phase drive signal switching circuit to be conductive when it is needed to switch to the induction asynchronous motor, controls the control signal to be no longer transmitted to the first three-phase bridge pre-drive chip, transmits the control signal to the three-phase drive signal switching circuit, amplifies the voltage through the second three-phase bridge pre-drive chip, and drives the induction asynchronous motor to work through the corresponding three-phase drive bridge.

[0037] The collection module comprises a pedal position sensor, a motor temperature sensor, a vehicle speed sensor and a load sensor. The pedal position sensor can detect the stroke of the pedal, transmit a signal to the MCU through a filter circuit, so that the MCU judges whether it is an emergency brake. The vehicle speed sensor and the load sensor transmit signals through a vehicle bus, and transmit the signals to the MCU through CAN protection and a filter circuit, so that the MCU judges the size of the vehicle inertia. The motor temperature sensor transmits a signal to the MCU. The first three-phase bridge pre-drive chip is connected with a current detection circuit, which can feed back the current size to the MCU, so that the MCU judges whether the permanent magnet synchronous motor works abnormally.

[0038] The controller of the induction asynchronous motor is installed outside the chassis. When the EMB caliper is braked, it will heat up quickly. Therefore, the controller of the induction asynchronous motor is installed outside the chassis instead of being integrated on the EMB caliper, thereby further reducing the risk of overheating.

[0039] Specific use (working) process:

[0040] According to the stroke of the brake pedal, it is judged whether the vehicle is in normal braking or emergency braking. According to the vehicle load and the wheel speed, it is judged whether the inertia of the vehicle during braking exceeds a preset value.

[0041] When the vehicle is in a normal braking state and the vehicle running inertia does not exceed a preset value, the control module controls the permanent magnet synchronous motor to brake.

[0042] When the vehicle is in a normal braking state and the vehicle running inertia exceeds a preset value, the control module controls the induction asynchronous motor to brake.

[0043] When the vehicle is in an emergency braking state, the control module controls the induction asynchronous motor to brake.

[0044] According to the current change of the double-motor drive module and the temperature of the permanent magnet synchronous motor, it is judged whether the permanent magnet synchronous motor needs to be stopped, so that the control module controls the induction asynchronous motor to brake.

[0045] In the braking system, the permanent magnet synchronous motor is used as a common motor, and the induction asynchronous motor is used as a standby motor, when high speed and heavy load, emergency braking, common motor failure, the standby motor is automatically switched to brake, which ensures the driving safety and improves the service life of the common motor.

[0046] The above-mentioned embodiments are only preferred embodiments of the utility model, and cannot be used to limit the range of the utility model protection, and any non-substantial change and replacement made by the person skilled in the art on the basis of the utility model belongs to the range of the utility model protection.

Claims

1. An EMB braking system using a permanent magnet synchronous and induction asynchronous dual motor, characterized in that: it comprises a dual motor drive module, a collection module, and a control module; the dual motor drive module can control the operation of the permanent magnet synchronous motor and the induction asynchronous motor respectively; the collection module is used to collect driving information and transmit the driving information to the control module; the control module adjusts the starting priority of the permanent magnet synchronous motor and the induction asynchronous motor according to the driving information, so that the dual motor drive module starts the induction asynchronous motor or the permanent magnet synchronous motor when braking.

2. The EMB braking system using a permanent magnet synchronous and induction asynchronous dual motor according to claim 1, characterized in that: the collection module comprises a pedal position sensor, a motor temperature sensor, a vehicle speed sensor, and a load sensor.

3. The EMB braking system using a permanent magnet synchronous and induction asynchronous dual motor according to claim 2, characterized in that: the control module comprises an MCU, and the dual motor drive module comprises a first three-phase bridge pre-drive chip, a second three-phase bridge pre-drive chip, and a three-phase drive signal switching circuit; when braking by the permanent magnet synchronous motor, the MCU transmits a control signal to the first three-phase bridge pre-drive chip, and the first three-phase bridge pre-drive chip starts the permanent magnet synchronous motor through a three-phase drive bridge; when braking by the induction asynchronous motor, the three-phase drive signal switching circuit transmits a control signal to the second three-phase bridge pre-drive chip, and the second three-phase bridge pre-drive chip starts the induction asynchronous motor through a three-phase drive bridge.

4. The EMB braking system using a permanent magnet synchronous and induction asynchronous dual motor according to claim 2, characterized in that: when the vehicle is in a normal braking state and the vehicle running inertia does not exceed a preset value, the control module controls the permanent magnet synchronous motor to brake; when the vehicle is in a normal braking state and the vehicle running inertia exceeds the preset value, the control module controls the induction asynchronous motor to brake; when the vehicle is in an emergency braking state, the control module controls the induction asynchronous motor to brake.

5. The EMB braking system using a permanent magnet synchronous and induction asynchronous dual motor according to claim 3, characterized in that: the MCU determines whether the permanent magnet synchronous motor needs to be stopped and the induction asynchronous motor needs to be switched to brake according to the current change of the dual motor drive module and the temperature of the permanent magnet synchronous motor.

6. The EMB braking system using a permanent magnet synchronous and induction asynchronous dual motor according to claim 1, characterized in that: it further comprises a power module, and the power module comprises a power management chip, between which a surge protection unit and a power filter unit are sequentially arranged.

7. The EMB braking system using a permanent magnet synchronous and induction asynchronous dual motor according to claim 1, characterized in that: the controller of the induction asynchronous motor is installed outside the chassis.

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