Pull type touring car body stability control system based on electromagnetic brake

Abstract

The invention belongs to the field of travel trailer, and particularly relates to a travel trailer body stability control system based on an electromagnetic brake, which comprises a storage battery, a main controller, a three-axis acceleration sensor, a buzzer, an indicator lamp, a left electromagnetic brake and a right electromagnetic brake, a voltage detection circuit is electrically connected between the storage battery and the main controller, and the three-axis acceleration sensor, the buzzer and the indicator lamp are all electrically connected with the main controller. The acceleration parameter of the vehicle body is detected in real time through the three-axis acceleration sensor, and when the three-axis acceleration sensor detects that the vehicle body slides in the horizontal direction, the corresponding electromagnetic brake is braked through the main controller and the MOS tube driving circuit, so that lateral sliding of the vehicle body is reduced to a large extent, dead swing is prevented, and the safety of the vehicle body is improved. And the stability and the safety of the motor home body are greatly guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of trailer-type caravans, and in particular to a body stability control system of a trailer-type caravan based on an electromagnetic brake. Background Art

[0002] Currently, there is no reliable body stability control system for RVs. When the RV is driving at high speed, if the RV changes lanes or turns urgently or the driver operates improperly, the RV is prone to sideways sliding. When the sliding amplitude is too large and the body is out of control, it is easy to form a death swing, leading to a rollover accident, posing a great safety hazard to the application of RVs. Based on this, we propose a body stability control system for trailer RVs based on electromagnetic brakes. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention proposes a body stability control system for a trailer RV based on an electromagnetic brake.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A trailer car body stability control system based on electromagnetic brakes comprises a battery, a main controller, a three-axis acceleration sensor, a buzzer, an indicator light, a left electromagnetic brake and a right electromagnetic brake, wherein a voltage detection circuit is electrically connected between the battery and the main controller, the three-axis acceleration sensor, the buzzer and the indicator light are all electrically connected to the main controller, the main controller is electrically connected to two groups of MOS tube drive circuits, the main controller is electrically connected to the left electromagnetic brake through one group of MOS tube drive circuits, and the main controller is electrically connected to the right electromagnetic brake through another group of MOS tube drive circuits, and the two groups of MOS tube drive circuits are also electrically connected to a current detection circuit electrically connected to the main controller.

[0005] Preferably, the battery is a 12V vehicle-mounted battery, and a power supply circuit for powering the main controller is electrically connected between the battery and the main controller. The power supply circuit uses an LM2596 chip to convert the 12V voltage provided by the battery into a 5V voltage, and the power supply circuit also uses an AMS117 chip to convert the converted 5V voltage into a 3.3V voltage.

[0006] Preferably, the voltage detection circuit is used to detect the power supply voltage in real time. When the voltage detection circuit detects that the power supply voltage is higher or lower than the normal input voltage, it controls the buzzer through the main controller to sound an alarm and the indicator light to light up a red light to alarm. It also controls the left electromagnetic brake and the right electromagnetic brake through the main controller and the MOS tube drive circuit to suspend electromagnetic braking.

[0007] Preferably, the MOS tube driving circuit is mainly composed of NMOS tubes of model NCE6050, and the main controller controls the output power of the electromagnetic brake by outputting a PWM waveform to control the opening and closing of the NMOS tube. When the PWM duty cycle is 100%, the electromagnetic brake outputs full load power.

[0008] Preferably, the current detection circuit is composed of a 100mΩ sampling circuit and an operational amplifier circuit. The current detection circuit is used to perform real-time detection of the current of the left electromagnetic brake and the right electromagnetic brake when they are running at full load power. When the current detection circuit detects that the current of the left electromagnetic brake or the right electromagnetic brake when running at full load power is too large and exceeds the limit, it controls the buzzer through the main controller to sound an alarm and the indicator light to light up a red light to alarm.

[0009] Preferably, the three-axis acceleration sensor adopts a high-precision three-axis acceleration sensor chip of the SC7A20 model. The three-axis acceleration sensor detects the acceleration parameters of the vehicle body in real time. The three-axis acceleration sensor establishes a Cartesian coordinate system with the high-precision three-axis acceleration sensor chip as the origin. When the vehicle body is stationary on a horizontal road, the acceleration in the X-axis direction is 0, the acceleration in the Y-axis direction is 0, and the acceleration in the Z-axis direction is the gravity acceleration G. When the RV body slides in the horizontal direction, the acceleration in the X-axis direction increases rapidly. When the acceleration in the X-axis direction exceeds the set limit, the three-axis acceleration sensor brakes the corresponding electromagnetic brake through the main controller and the MOS tube drive circuit.

[0010] Preferably, the RV body slides horizontally including sliding to the left and sliding to the right. When sliding to the left, the three-axis acceleration sensor brakes the left electromagnetic brake through the main controller and the MOS tube drive circuit. When sliding to the right, the three-axis acceleration sensor brakes the right electromagnetic brake through the main controller and the MOS tube drive circuit.

[0011] Preferably, the main controller is also electrically connected to an external crystal oscillator circuit, and the external crystal oscillator circuit is composed of an external passive crystal oscillator of the NX5032GA-8.000M model and a peripheral oscillation capacitor.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention detects the power supply voltage in real time through a voltage detection circuit. When the voltage detection circuit detects that the power supply voltage is higher or lower than the normal input voltage, it controls the buzzer and indicator light through the main controller to give an audible and visual alarm; 2. The present invention detects the current of the left electromagnetic brake and the right electromagnetic brake at full load power in real time through the current detection circuit. When the current detection circuit detects that the current of the left electromagnetic brake or the right electromagnetic brake at full load power is too large and exceeds the limit, it controls the buzzer and the indicator light through the main controller to give an audible and visual alarm; 3. The present invention uses a three-axis acceleration sensor to detect the acceleration parameters of the vehicle body in real time. When the three-axis acceleration sensor detects that the vehicle body is sliding in the horizontal direction, it brakes the corresponding electromagnetic brake through the main controller and the MOS tube drive circuit, thereby reducing the lateral slip of the vehicle body to the greatest extent, preventing the occurrence of death swing, and providing greater protection for the stability and safety of the RV body. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a system block diagram of a trailer car body stability control system based on electromagnetic brakes proposed by the present invention; Figure 2 This is an operating principle diagram of a trailer caravan body stability control system based on electromagnetic brakes proposed by the present invention. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0015] Reference Figure 1-2A body stability control system for a trailer RV based on an electromagnetic brake includes a battery, a main controller, a three-axis acceleration sensor, a buzzer, an indicator light, a left electromagnetic brake and a right electromagnetic brake. A voltage detection circuit is electrically connected between the battery and the main controller. The battery is a 12V vehicle-mounted battery. A power supply circuit for supplying power to the main controller is also electrically connected between the battery and the main controller. The power supply circuit uses an LM2596 chip to convert a 12V voltage provided by the battery into a 5V voltage, and the power supply circuit also uses an AMS117 chip to convert the converted 5V voltage into a 3.3V voltage. The three-axis acceleration sensor, the buzzer and the indicator light are all electrically connected to the main controller. The main controller is electrically connected to two groups of MOS tube drive circuits. The main controller is electrically connected to the left electromagnetic brake through one set of MOS tube drive circuits, and the main controller is electrically connected to the right electromagnetic brake through another set of MOS tube drive circuits. The MOS tube drive circuit is mainly composed of NCE6050 model NMOS tubes. The main controller controls the output power of the electromagnetic brake by outputting PWM waveforms to control the opening and closing of the NMOS tubes. When the PWM duty cycle is 100%, the electromagnetic brake outputs full load power. The two sets of MOS tube drive circuits are also electrically connected to the same current detection circuit electrically connected to the main controller. The main controller is also electrically connected to an external crystal oscillator circuit. The external crystal oscillator circuit is composed of an external passive crystal oscillator of the NX5032GA-8.000M model and a peripheral starting capacitor.

[0016] Specifically, the voltage detection circuit is used to detect the power supply voltage in real time. When the voltage detection circuit detects that the power supply voltage is higher or lower than the normal input voltage, it controls the buzzer through the main controller to sound an alarm and the indicator light to light up a red light to alarm. It also controls the left electromagnetic brake and the right electromagnetic brake through the main controller and the MOS tube drive circuit to suspend electromagnetic braking.

[0017] Furthermore, the current detection circuit is composed of a 100mΩ sampling circuit and an operational amplifier circuit. The current detection circuit is used to perform real-time detection of the current of the left electromagnetic brake and the right electromagnetic brake when they are running at full load power. When the current detection circuit detects that the current of the left electromagnetic brake or the right electromagnetic brake when running at full load power is too large and exceeds the limit, it controls the buzzer through the main controller to sound an alarm and the indicator light to light up a red light to alarm.

[0018] Furthermore, the three-axis acceleration sensor adopts the high-precision three-axis acceleration sensor chip of the SC7A20 model. The three-axis acceleration sensor detects the acceleration parameters of the vehicle body in real time. The three-axis acceleration sensor establishes a Cartesian coordinate system with the high-precision three-axis acceleration sensor chip as the origin. When the vehicle body is stationary on a horizontal road, the acceleration in the X-axis direction is 0, the acceleration in the Y-axis direction is 0, and the acceleration in the Z-axis direction is the gravity acceleration G. When the RV body slides horizontally, the acceleration in the X-axis direction increases rapidly. When the acceleration in the X-axis direction exceeds the set limit, the three-axis acceleration sensor brakes the corresponding electromagnetic brake through the main controller and the MOS tube drive circuit. The horizontal sliding of the RV body includes sliding to the left and sliding to the right. When sliding to the left, the three-axis acceleration sensor brakes the left electromagnetic brake through the main controller and the MOS tube drive circuit. When sliding to the right, the three-axis acceleration sensor brakes the right electromagnetic brake through the main controller and the MOS tube drive circuit.

[0019] The operating principle of this embodiment is as follows: The main controller controls the current detection circuit to perform real-time detection of the current of the left electromagnetic brake and the right electromagnetic brake at full load power. If the current detection circuit detects that the current of the left electromagnetic brake or the right electromagnetic brake at full load power is too large and exceeds the limit, the current detection circuit controls the buzzer through the main controller to sound an alarm and the indicator light turns on red. If the current detection circuit detects that the current of the left electromagnetic brake or the right electromagnetic brake at full load power does not exceed the limit, the main controller controls the voltage detection circuit to detect the power supply voltage in real time. When the voltage detection circuit detects that the power supply voltage is higher or lower than the normal input voltage, the voltage detection circuit controls the buzzer through the main controller to sound an alarm and the indicator light turns on red. The light alarm is on, and the voltage detection circuit also controls the left electromagnetic brake and the right electromagnetic brake to pause the electromagnetic brake through the main controller and the MOS tube drive circuit. When the voltage detection circuit detects that the power supply voltage is the normal input voltage, the main controller controls the three-axis acceleration sensor to detect the body acceleration parameters in real time. When the RV body slides horizontally, the acceleration in the X-axis direction increases rapidly. When the body slides to the left and the acceleration in the X-axis direction exceeds the set limit, the three-axis acceleration sensor brakes the left electromagnetic brake through the main controller and the MOS tube drive circuit. When the body slides to the right and the acceleration in the X-axis direction exceeds the set limit, the three-axis acceleration sensor brakes the right electromagnetic brake through the main controller and the MOS tube drive circuit.

[0020] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A trailer RV body stability control system based on electromagnetic brakes, comprising a battery, a main controller, a three-axis acceleration sensor, a buzzer, an indicator light, a left electromagnetic brake and a right electromagnetic brake, characterized in that: A voltage detection circuit is electrically connected between the battery and the main controller, the three-axis acceleration sensor, the buzzer and the indicator light are all electrically connected to the main controller, the main controller is electrically connected to two groups of MOS tube drive circuits, the main controller is electrically connected to the left electromagnetic brake through one group of MOS tube drive circuits, and the main controller is electrically connected to the right electromagnetic brake through another group of MOS tube drive circuits, and the two groups of MOS tube drive circuits are also electrically connected to the same current detection circuit electrically connected to the main controller.

2. The vehicle body stability control system based on electromagnetic brake according to claim 1, characterized in that: The battery is a 12V vehicle-mounted battery. A power supply circuit for powering the main controller is electrically connected between the battery and the main controller. The power supply circuit uses an LM2596 chip to convert the 12V voltage provided by the battery into a 5V voltage, and the power supply circuit also uses an AMS117 chip to convert the converted 5V voltage into a 3.3V voltage.

3. The vehicle body stability control system based on electromagnetic brake according to claim 1, characterized in that: The voltage detection circuit is used to detect the power supply voltage in real time. When the voltage detection circuit detects that the power supply voltage is higher or lower than the normal input voltage, it controls the buzzer through the main controller to sound an alarm and the indicator light to light up a red light to alarm. It also controls the left electromagnetic brake and the right electromagnetic brake through the main controller and the MOS tube drive circuit to suspend electromagnetic braking.

4. The vehicle body stability control system based on electromagnetic brake according to claim 1, characterized in that: The MOS tube driving circuit is mainly composed of NCE6050 model NMOS tubes. The main controller controls the output power of the electromagnetic brake by outputting PWM waveforms to control the opening and closing of the NMOS tubes.

5. The vehicle body stability control system based on electromagnetic brake according to claim 1, characterized in that: The current detection circuit is composed of a 100mΩ sampling circuit and an operational amplifier circuit. The current detection circuit is used to perform real-time detection of the current of the left electromagnetic brake and the right electromagnetic brake when they are running at full load power. When the current detection circuit detects that the current of the left electromagnetic brake or the right electromagnetic brake running at full load power is too large and exceeds the limit, the main controller controls the buzzer to sound an alarm and the indicator light to light up a red light to alarm.

6. The vehicle body stability control system based on electromagnetic brake according to claim 1, characterized in that: The three-axis acceleration sensor adopts the high-precision three-axis acceleration sensor chip of the SC7A20 model. The three-axis acceleration sensor detects the acceleration parameters of the vehicle body in real time. The three-axis acceleration sensor establishes a Cartesian coordinate system with the high-precision three-axis acceleration sensor chip as the origin. When the RV body slides in the horizontal direction, the acceleration in the X-axis direction increases rapidly. When the acceleration in the X-axis direction exceeds the set limit, the three-axis acceleration sensor brakes the corresponding electromagnetic brake through the main controller and the MOS tube drive circuit.

7. The vehicle body stability control system based on electromagnetic brake according to claim 1, characterized in that: The main controller is also electrically connected to an external crystal oscillator circuit, which is composed of an external passive crystal oscillator of the NX5032GA-8.000M model and a peripheral oscillation capacitor.

Images