Voltage closed-loop system stability test system

Abstract

The present invention discloses a voltage closed-loop system stability test system, comprising an engine and engine controller, an ISG motor, and an ISG motor controller on a test bench, wherein the engine drags the ISG motor to generate electricity; and a towing system for simulating the consumption of electricity generated by the ISG motor by electrical equipment on a vehicle; the towing system comprises: a simulation motor for the vehicle electrical equipment and a simulation motor controller, a companion motor and a companion motor controller, wherein the rotating shafts of the simulation motor for the vehicle electrical equipment and the companion motor are connected in towing fashion; and the DC bus of the ISG motor controller is connected to the DC bus of the simulation motor controller. The present invention introduces a towing system to simulate the consumption of electricity generated by the ISG motor by electrical equipment on a vehicle, can simulate a wide range of load power, generates little heat, and can switch from a low-power consumption mode to a high-power consumption mode in a very short time, more closely resembling actual vehicle electrical operating conditions.

Description

Technical Field

[0001] The present invention relates to the field of voltage closed-loop control, and in particular to a voltage closed-loop system stability testing system. Background Art

[0002] When the large battery of a hybrid vehicle fails and cannot supply power to the onboard DC / DC converter, the vehicle will take the following actions: Figure 1 In the control method shown, the engine drives the ISG motor to generate high voltage, which is then transferred to the DC / DC converter to convert it into low voltage, and then power other electrical devices on the vehicle.

[0003] The power consumption of electrical devices on a vehicle varies greatly, with large, instantaneous, and unpredictable fluctuations. If the ISG motor cannot adjust its power output in a timely manner based on the power consumption of the vehicle's electrical devices, unstable power supply to these devices will occur, which can affect the driving experience at best and even damage the devices at worst. Therefore, it is crucial to simulate the changes in the vehicle's electrical load during bench testing to test the stability of the ISG motor's power generation.

[0004] In existing technology, the stability of the ISG motor's power generation is tested by varying the resistance of a variable resistor on a test bench to simulate changes in vehicle load. However, it's difficult to significantly change the resistance of a variable resistor in a short period of time, making it difficult for the simulation device to quickly switch from low to high power consumption mode. This makes it difficult to simulate the sudden and significant changes in power consumption of the vehicle's electrical equipment by varying the resistance of the variable resistor, resulting in an inadequate test of the ISG motor's power generation stability.

[0005] Existing techniques also include using a motor controller to control a three-phase inductor on a test bench to simulate the vehicle's electrical load, thereby testing the stability of the ISG motor's power generation. However, whether simulating the vehicle's electrical load by changing the value of a variable resistor or simulating the vehicle's electrical load by controlling the three-phase inductor via a motor controller, both methods consume the electrical energy generated by the ISG motor through heat generation. Excessive heat generation can easily cause the simulation device to burn out, making this method unsuitable for high-power testing. Summary of the Invention

[0006] The purpose of the present invention is to provide a voltage closed-loop system stability test system, which simulates the changes in the electrical load on the vehicle to test the power generation stability of the ISG motor during the bench experiment test stage.

[0007] The technical solution of the present invention is:

[0008] The voltage closed-loop system stability test system includes an engine and an engine controller, an ISG motor and an ISG motor controller on a test bench. The engine drags the ISG motor to generate electrical energy; it also includes a set of towing systems for simulating the consumption of electrical energy generated by the ISG motor by the electrical equipment of the whole vehicle; the towing system includes: a simulation motor and a simulation motor controller for the electrical equipment of the whole vehicle, a companion test motor and a companion test motor controller, and the rotating shafts of the simulation motor of the electrical equipment of the whole vehicle and the companion test motor are connected in towing; the DC bus of the ISG motor controller is connected to the DC bus of the simulation motor controller.

[0009] Preferably, a torque sensor and a speed sensor are respectively installed on the connecting shaft between the engine and the ISG motor, and the connecting shaft between the simulation motor and the accompanying test motor.

[0010] Preferably, the electrical equipment of the entire vehicle simulates the motor operating in a driving mode, consuming the electrical energy provided by the ISG motor.

[0011] Preferably, the accompanying test motor provides a stable rotation speed for the simulated motor of the vehicle electrical equipment.

[0012] Preferably, when the simulated motor of the vehicle electrical equipment operates in a driving mode, the accompanying test motor operates in a feeding mode to generate electricity for the power grid.

[0013] The advantages of the present invention are:

[0014] 1. The present invention introduces a towing system to simulate the vehicle's electrical equipment consuming the electrical energy generated by the ISG motor. The load power range that can be simulated is wide, from hundreds of watts to tens of kilowatts.

[0015] 2. The test system of the present invention generates little heat and is less likely to cause the measuring device to burn out;

[0016] 3. The electric drive system of the present invention has a fast torque response. The vehicle electrical equipment simulation device can switch from a low power consumption mode to a high power consumption mode in a very short time. This makes the test of the ISG motor power generation stability more rigorous and closer to the actual vehicle power consumption conditions.

[0017] 4. The test motor of the present invention is used to provide a stable speed for the vehicle electrical equipment simulation device. When the simulation device operates in the driving mode, the test motor operates in the feeding mode to generate electricity for the power grid. This can reduce the total energy consumption during the test process and achieve energy-saving and environmental protection effects.

[0018] 5. The present invention connects the busbar of the power simulation motor controller with the busbar of the ISG motor controller. The power equipment simulation device is responsible for consuming the electric energy output by the ISG motor controller. The output voltage stability ability of the ISG motor is detected by simulating the size of the power load by changing the working state of the power equipment simulation device. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of the prior art in which an engine drives an ISG motor to generate electricity and supplies power to electrical equipment through a DC / DC converter;

[0021] Figure 2 It is a schematic diagram of the voltage closed-loop system stability test system of the present invention. DETAILED DESCRIPTION

[0022] like Figure 2 As shown, the voltage closed-loop system stability test system of the present invention includes an engine and engine controller, an ISG motor, and an ISG motor controller on a test bench. The engine drives the ISG motor to generate electricity. It also includes a towing system for simulating the consumption of electricity generated by the ISG motor by the vehicle's electrical equipment. The towing system includes a simulated motor for the vehicle's electrical equipment and a simulated motor controller, a companion motor and a companion motor controller, with the rotating shafts of the simulated motor for the vehicle's electrical equipment and the companion motor connected to each other. The DC bus of the ISG motor controller is connected to the DC bus of the simulated motor controller. A torque sensor and a speed sensor are respectively installed on the connecting shafts between the engine and the ISG motor, and the connecting shafts between the simulated motor and the companion motor.

[0023] The engine of the present invention drives an ISG motor to generate electricity. The ISG motor's controller DC bus is connected to the bus of a motor controller simulating a vehicle's electrical equipment. The ISG motor generates electricity for use in a vehicle's electrical equipment simulation device. The vehicle's electrical equipment simulation motor operates in drive mode, consuming the electricity provided by the ISG motor. A companion test motor is used to provide a stable rotational speed for the vehicle's electrical equipment simulation device, preventing the simulation device from overrunning. When the vehicle's electrical equipment simulation motor operates in drive mode, the companion test motor operates in feed mode to generate electricity for the power grid. This reduces the overall energy consumption during the test process, achieving energy conservation and environmental protection.

[0024] According to the formula P = n*T / 9550 (where P represents the system's output power, n represents the system's operating speed, and T represents the system's output torque), at low speeds, even high torque generates low power. At high speeds, even low torque generates high power. Furthermore, because the simulator operates in drive mode, most of the electrical energy generated by the ISG motor is dissipated as mechanical energy. This method generates much less heat than pure heat dissipation.

[0025] Due to the fast torque response of the electric drive system, the vehicle electrical equipment simulation device can switch from low-power consumption mode to high-power consumption mode in a very short time. The test of the ISG motor's power generation stability is more rigorous and closer to the actual vehicle electrical conditions.

[0026] This application connects the bus of the power simulation motor controller with the bus of the ISG motor controller. The power equipment simulation device is responsible for consuming the electric energy output by the ISG motor controller. By changing the working state of the power equipment simulation device to simulate the size of the power load, the output voltage stability ability of the ISG motor is detected.

[0027] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any modifications made based on the spirit of the main technical solution of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A voltage closed-loop system stability test system, comprising an engine and an engine controller, an ISG motor and an ISG motor controller on a test bench, wherein the engine drives the ISG motor to generate electrical energy; characterized in that: The system also includes a towing system for simulating the consumption of electric energy generated by the ISG motor by the vehicle's electrical equipment. The towing system includes: a simulated motor for the vehicle's electrical equipment and a simulated motor controller, a companion motor for testing, and a companion motor controller for testing. The rotating shafts of the simulated motor for the vehicle's electrical equipment and the companion motor for testing are connected to each other. The DC bus of the ISG motor controller is connected to the DC bus of the simulated motor controller. The vehicle electrical equipment simulates the motor working in the driving mode and consumes the electric energy provided by the ISG motor; The accompanying test motor provides a stable rotation speed for the simulated motor of the vehicle electrical equipment.

2. The voltage closed-loop system stability test system according to claim 1, characterized in that: The connecting shaft between the engine and the ISG motor, and the connecting shaft between the simulation motor and the accompanying test motor are respectively equipped with a torque sensor and a speed sensor.

3. The voltage closed-loop system stability test system according to claim 2, characterized in that: When the vehicle electrical equipment simulation motor operates in the driving mode, the accompanying test motor operates in the feeding mode to generate electricity for the power grid.

Images