Dynamic control system and method for generator of fuel vehicle

Abstract

The invention relates to the technical field of dynamic control of a fuel vehicle generator, in particular to a dynamic control method of a fuel vehicle generator, which comprises the following steps: under the operation condition of an engine, when an engine ECU (Electronic Control Unit) judges that the voltage and electric quantity of a battery are lower than set values, the engine ECU controls the generator to generate electricity through LIN or CAN (Controller Area Network), and generates electricity with different voltages and different durations according to the state of the battery; when the set time or the voltage is reached, the generator is controlled to stop generating power; under special working conditions, in order to ensure stable vehicle power supply output and protect a battery, according to the actual use condition of the vehicle, the following working conditions can be selected: an engine overrun state, a low-temperature environment, a plateau environment and a long idle state, when an air conditioner is turned on, an ECU controls a generator to generate power at a fixed voltage, and power generation is stopped until the working condition of the engine is changed; the engine load can be effectively reduced, and the fuel consumption of the whole vehicle is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of dynamic control of generators for fuel vehicles, and in particular to a dynamic control system and method for generators for fuel vehicles. Background Art

[0002] In recent years, environmental protection policies have become stricter, automobile fuel emission policies have been tightened, and reducing fuel consumption of fuel vehicles has become the focus of attention of various automobile manufacturers. In addition, more and more automotive electronic equipment has been used, and the electrical load of the vehicle has increased dramatically, which has also put forward higher requirements for the power supply of the vehicle. In order to meet the increasing power demand and fuel consumption requirements, the simple constant voltage output mode not only fails to meet the needs of the vehicle but also increases the vehicle load. The generator control that dynamically adjusts the output voltage only generates electricity when the generator is needed, and exits the power generation when it is not needed, reducing the load of the vehicle, avoiding the long-term operation of the motor and the overcharging of the battery, extending the life of the motor and the battery, and also reducing CO2 emissions.

[0003] The Chinese patent with announcement number CN107355304 B, "Automotive Generator Control Method and System", introduces a control method in which the generator does not generate electricity when the engine is cold-started. After the engine is started, the generator starts to generate electricity until the engine stops, so as to reduce the load at startup and improve the engine's cold-start capability.

[0004] The Chinese patent with announcement number CN209738996U, "A LIN generator control system with adjustable voltage", introduces a LIN-controlled generator control method, which dynamically adjusts the generator output voltage according to the vehicle operating conditions and battery information. The generator is always in a power generation state, but the output voltage is different. In most cases, the battery is in an overcharged state.

[0005] The above two existing technologies, on the one hand, cannot solve the problem of battery power and power generation under low temperature conditions, and on the other hand, cannot effectively control the running time of the generator. Summary of the invention

[0006] In view of the above problems, the present invention provides a dynamic control system and method for a generator of a fuel vehicle.

[0007] The technical solution adopted is a dynamic control system for a fuel vehicle generator, including an engine ECU, a generator controller, a generator, a battery and a battery voltage / capacity sensor; The engine ECU is used to control the generator controller; The generator controller is used to control the generator and to generate electricity or stop generating electricity based on the generated voltage and time; The battery voltage / capacity sensor is used to detect the voltage / capacity of the battery and send the detected information to the engine ECU.

[0008] Optionally, the engine ECU receives the battery voltage / power detected by the battery voltage / power sensor, and the different step voltages / power correspond to different power generation durations respectively, and controls the generator to generate power at a preset voltage through the generator controller; When the power generation time ends or the battery voltage / power detected by the battery voltage / power sensor reaches the upper limit, the engine ECU controls the generator to stop generating power through the generator controller.

[0009] Optionally, the engine ECU determines the engine operating condition through the engine speed signal and the engine start signal. When the engine ECU receives the engine start signal and the received engine speed signal shows that the engine speed is lower than the idle speed, it is the starting condition. When the speed signal determines that the speed is greater than or equal to the idle speed value, it is the operating condition.

[0010] Optionally, the engine ECU compares the engine speed signal with the set speed value. If the current speed is greater than the set speed and the current actual fuel injection amount is less than the set fuel injection amount, the vehicle is in an overrun state. The engine ECU controls the generator through the generator controller to generate electricity at a preset voltage. When the overrun state conditions are not met, the engine ECU controls the generator through the generator controller to stop generating electricity.

[0011] Optionally, the engine ECU determines whether the battery is in a low temperature state based on the ambient temperature sensor. If the ambient temperature is lower than the set temperature and the engine is in an operating condition, the engine ECU controls the generator through the generator controller to generate electricity at a preset voltage until the vehicle stops.

[0012] Optionally, the engine ECU determines whether the battery is in a plateau state based on the atmospheric pressure sensor. If the altitude is higher than the set altitude and the engine is in operating condition, the engine ECU controls the generator through the generator controller to generate electricity at a preset voltage and duration. When the power generation duration expires, the engine ECU controls the generator through the generator controller to stop generating electricity. The stop time will also be counted. When the timing time is up, the power generation logic will be re-triggered and the above logic will be repeated until the vehicle stops.

[0013] Optionally, the engine ECU directly enables the forced power generation logic according to the long idle time under the vehicle operating conditions. The engine ECU controls the generator to generate electricity at a set fixed voltage through the generator controller. When the voltage is higher than the set voltage, the power generation is stopped. The stop time is also counted. When the timing time is up, the power generation logic is re-triggered and the above logic is repeated until the long idle condition ends.

[0014] Optionally, the engine ECU enables forced power generation logic according to the usage of the vehicle's air conditioning. When the air conditioning is on time is greater than the set time, the engine ECU controls the generator through the generator controller to generate electricity at a set fixed voltage. When the voltage is higher than the set voltage, power generation is stopped. After the power is stopped, the air conditioning on time is recalculated, and the power generation logic is re-triggered when the timing time is up. The above logic is repeated until the air conditioning is turned off.

[0015] Optionally, the power generation state of the generator controlled by the engine ECU is selected and applied according to the actual application scenario of the vehicle.

[0016] Based on the above system, the present application also provides a method for dynamic control of a fuel vehicle generator, comprising the following steps: S1. The battery voltage / capacity sensor detects changes in battery voltage / capacity and transmits the collected information to the engine ECU; S2. The engine ECU determines the engine operating conditions and controls the generator controller; S3. The generator controller controls the generator and changes the voltage / power in the battery; S4. The battery voltage / capacity sensor detects changes in the battery voltage / capacity and transmits the collected information to the engine ECU again to generate electricity or stop generating electricity.

[0017] The beneficial effects of the present invention are: 1. While ensuring the vehicle's power consumption, the engine load can be reduced to the maximum extent, and the generator is started only when power generation is really needed. The power generation voltage and duration vary according to different working conditions. In most cases, power generation is not required, which increases the effective output torque of the engine, reduces fuel consumption, improves driving feel, reduces carbon emissions, and recovers energy during braking, meeting increasingly stringent emission and fuel consumption requirements; 2. According to the vehicle operating conditions and battery information and characteristics, the generator is controlled to generate electricity according to the set voltage and corresponding duration. In most operating conditions, the generator stops generating electricity, which effectively reduces the operating time of the generator, and the battery can be effectively charged and discharged, which not only extends the service life of the motor and battery, but also reduces the fuel consumption of fuel vehicles and ensures emissions. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the block diagram of the dynamic fuel vehicle generator control system; Figure 2 This is the control schematic diagram of the generator when the engine is running.

[0019] The reference numerals are: 1 is the battery voltage / capacity sensor, 2 is the engine ECU, 3 is the generator controller, 4 is the generator, and 5 is the battery. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention through specific examples. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0021] It should be noted that the illustrations provided in the following embodiments are only used to schematically illustrate the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0022] In this embodiment, Figure 1 As shown, a dynamic control system for a fuel vehicle generator is provided, including an engine ECU 2, a generator controller 3, a generator 4, a battery 5 and a battery voltage / capacity sensor 1; The engine ECU 2 is used to control the generator controller 3; The generator controller 3 is used to control the generator 4 and to generate electricity or stop generating electricity based on the generated voltage and time; The battery voltage / capacity sensor 1 is used to detect the voltage / capacity of the battery 5 and send the detected information to the engine ECU 2 .

[0023] Meanwhile, in a specific implementation, the engine ECU 2 receives the different step voltages / power levels of the battery 5 detected by the battery voltage / power level sensor 1, which are lower than the set upper limit value, and respectively correspond to different power generation durations, and controls the generator 4 to generate power at a preset voltage through the generator controller 3; When the power generation time ends or the voltage / power of the battery 5 detected by the battery voltage / power sensor 1 reaches the upper limit value, the engine ECU 2 controls the generator 4 to stop power generation through the generator controller 3 .

[0024] Furthermore, the engine ECU2 determines the engine operating condition through the engine speed signal and the engine start signal. When the engine ECU2 receives the engine start signal and the received engine speed signal shows that the engine speed is lower than the idle speed, it is the starting condition. When the speed signal determines that the speed is greater than or equal to the idle speed value, it is the operating condition.

[0025] At the same time, the engine ECU2 compares the engine speed signal with the set speed value. If the current speed is greater than the set speed and the current actual injection amount is less than the set injection amount, the vehicle is in an overrun state. The engine ECU2 controls the generator 4 to generate electricity at a preset voltage through the generator controller 3. When the overrun state conditions are not met, the engine ECU2 controls the generator 4 to stop generating electricity through the generator controller 3.

[0026] In addition, the engine ECU2 determines whether the battery 5 is in a low temperature state based on the ambient temperature sensor. If the ambient temperature is lower than the set temperature and the engine is in an operating condition, the engine ECU2 controls the generator 4 to generate electricity at a preset voltage through the generator controller 3 until the vehicle stops.

[0027] At the same time, the engine ECU2 determines whether the battery 5 is in a plateau state based on the atmospheric pressure sensor. If the altitude is higher than the set altitude, after the engine is in operating condition, the engine ECU2 controls the generator 4 through the generator controller 3 to generate electricity according to the preset voltage and duration. When the power generation duration expires, the engine ECU2 controls the generator 4 through the generator controller 3 to stop generating electricity. The stop time will also be counted. When the timing time is up, the power generation logic will be re-triggered and the above logic will be repeated until the vehicle stops.

[0028] In addition, the engine ECU2 directly enables the forced power generation logic according to the long idling time under the vehicle operating condition. The engine ECU2 controls the generator 4 to generate electricity at a set fixed voltage through the generator controller 3. When the voltage is higher than the set voltage, the power generation is stopped. The stop time will also be counted. When the timing time is up, the power generation logic is re-triggered and the above logic is repeated until the long idling condition ends.

[0029] At the same time, the engine ECU2 enables the forced power generation logic according to the use of the vehicle air conditioning. When the air conditioning is on for longer than the set time, the engine ECU2 controls the generator 4 through the generator controller 3 to generate electricity at a set fixed voltage. When the voltage is higher than the set voltage, the power generation is stopped. After the power generation is stopped, the air conditioning on time is recalculated, and the power generation logic is retriggered when the timing time is up. The above logic is repeated until the air conditioning is turned off.

[0030] like Figure 2As shown, in a specific implementation scenario, according to the real-time information fed back by the battery voltage / power sensor, the engine does not generate electricity in the starting state, thereby improving the starting performance of the engine; when the engine is in the running state, if the battery voltage or power is lower than the set value, the engine ECU sends a power generation voltage signal to the generator controller through LIN or CAN, and the engine ECU sets the power generation time required under different voltages / power levels according to the battery characteristics. When the set time is reached, the engine ECU sends a signal to stop power generation to the generator controller through LIN or CAN; if the power consumption is small and the charging efficiency is high under certain working conditions, the power generation time has not yet arrived, but the battery voltage / power has reached the upper limit, the ECU will determine to end the power generation instruction in advance and send a signal to stop power generation to the generator controller to avoid ineffective power generation.

[0031] When the ambient temperature is below -30 degrees Celsius, the battery's power supply capacity will drop sharply. To ensure the normal use of the vehicle and avoid battery damage, under vehicle operating conditions, the engine ECU will directly enable the forced power generation logic and control the generator to generate electricity at a set fixed voltage until the engine stops generating electricity, instead of using the dynamic power generation logic to ensure the normal power supply of the battery.

[0032] When a refrigerated truck is in long idling condition, since the air conditioner is always in a power-consuming state, dynamic power generation is not conducive to the use of the refrigeration function. Under this condition, the engine ECU will directly enable the forced power generation logic according to the long idling time, and control the generator to generate electricity at a set fixed voltage to ensure the normal use of the refrigerated air conditioner and the vehicle in long idling condition. When the voltage is higher than the set voltage, power generation will be stopped, the time for long idling to trigger the forced power generation logic will be recalculated, and the power generation logic will be retriggered when the timing time is up, and so on.

[0033] When the vehicle is in Overrun condition, the engine speed is higher than the actual demand of the vehicle. In order to make better use of this part of kinetic energy and improve fuel efficiency, the engine ECU will directly enable the forced power generation logic and control the generator to generate electricity at a set fixed voltage, thereby consuming this part of the torque and improving the driving experience. When the Overrun condition is not met, power generation will be stopped.

[0034] At high altitudes, the battery's charging and discharging efficiency will be affected. When dynamic power generation cannot meet the vehicle's needs, forced power generation conditions can be used to extend the power generation time, shorten the discharge time, ensure normal charging and discharging of the battery, and avoid damage to the battery.

[0035] The purpose of this design is to minimize the engine load while ensuring the vehicle's electricity consumption, and to start the generator only when it is really necessary to generate electricity. In addition, the power generation voltage and duration vary under different working conditions, and in most cases, no power generation is required, which improves the engine's effective output torque, reduces fuel consumption, improves driving feel, reduces carbon emissions, and recovers energy during braking to meet increasingly stringent emission and fuel consumption requirements. According to the vehicle's operating conditions and battery information and characteristics, the generator is controlled to generate electricity at the set power generation voltage and corresponding duration. In most operating conditions, the generator stops generating electricity, effectively reducing the generator's operating time, and the battery can be effectively charged and discharged, which not only extends the service life of the motor and battery, but also reduces the fuel consumption of fuel vehicles and ensures emissions.

[0036] In this embodiment, based on the dynamic control system of the fuel vehicle generator, a dynamic control method for a fuel vehicle generator is provided, comprising the following steps: S1. The battery voltage / power sensor 1 detects the voltage / power change of the battery 5 and transmits the collected information to the engine ECU2; S2. The engine ECU2 determines the engine operating conditions and controls the generator controller 3; S3. The generator controller 3 controls the generator 4 to change the voltage / capacity in the battery 5; S4. The battery voltage / power sensor 1 detects the voltage / power change of the battery 5 and transmits the collected information to the engine ECU 2 again to start or stop power generation.

[0037] The purpose of this design is to reduce fuel consumption to a certain extent, reduce CO2 emissions, improve vehicle starting performance and driving experience, and extend the service life of the generator and battery.

[0038] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A dynamic control system for a fuel vehicle generator, characterized in that: It includes an engine ECU (2), a generator controller (3), a generator (4), a battery (5) and a battery voltage / capacity sensor (1); The engine ECU (2) is used to control a generator controller (3); The generator controller (3) is used to control the generator (4) and to generate electricity or stop generating electricity based on the generated voltage and time duration; The battery voltage / electricity sensor (1) is used to detect the voltage / electricity of the battery (5) and send the detected information to the engine ECU (2).

2. A fuel vehicle generator dynamic control system according to claim 1, characterized in that: The engine ECU (2) receives information detected by the battery voltage / power sensor (1) that the voltage / power of the battery (5) is lower than a set upper limit value, and the different step voltages / power correspond to different power generation durations, and controls the generator (4) to generate power at a preset voltage through the generator controller (3); When the power generation time ends or the voltage / capacity of the battery (5) detected by the battery voltage / capacity sensor (1) reaches an upper limit value, the engine ECU (2) controls the generator (4) to stop generating power through the generator controller (3).

3. A fuel vehicle generator dynamic control system according to claim 1, characterized in that: The engine ECU (2) determines the engine operating condition through the engine speed signal and the engine start signal. When the engine ECU (2) receives the engine start signal and the received engine speed signal shows that the engine speed is lower than the idle speed, it is a starting condition. When the speed signal determines that the speed is greater than or equal to the idle speed value, it is a running condition.

4. A fuel vehicle generator dynamic control system according to claim 1, characterized in that: The engine ECU (2) compares the engine speed signal with a set speed value. If the current speed is greater than the set speed and the current actual fuel injection amount is less than the set fuel injection amount, the vehicle is in an overrun state. The engine ECU (2) controls the generator (4) to generate electricity at a preset voltage through the generator controller (3). When the overrun state condition is not met, the engine ECU (2) controls the generator (4) to stop generating electricity through the generator controller (3).

5. A fuel vehicle generator dynamic control system according to claim 1, characterized in that: The engine ECU (2) determines whether the battery (5) is in a low temperature state based on the ambient temperature sensor; if the ambient temperature is lower than a set temperature and the engine is in an operating condition, the engine ECU (2) controls the generator (4) through the generator controller (3) to generate electricity at a preset voltage until the vehicle stops.

6. A fuel vehicle generator dynamic control system according to claim 1, characterized in that: The engine ECU (2) determines whether the battery (5) is in a plateau state based on the atmospheric pressure sensor. If the altitude is higher than a set altitude, the engine is in an operating condition, and the engine ECU (2) controls the generator (4) through the generator controller (3) to generate electricity at a preset voltage and duration. When the power generation duration expires, the engine ECU (2) controls the generator (4) through the generator controller (3) to stop generating electricity, and the stop time is also counted. When the time is up, the power generation logic is retriggered, and the above logic is repeated until the vehicle stops.

7. A fuel vehicle generator dynamic control system according to claim 1, characterized in that: The engine ECU (2) directly activates the forced power generation logic according to the long idle time under the vehicle operating condition. The engine ECU (2) controls the generator (4) to generate power at a set fixed voltage through the generator controller (3). When the voltage is higher than the set voltage, the power generation is stopped. The stop time is also counted. When the time is up, the power generation logic is re-triggered. The above logic is repeated until the long idle condition ends.

8. A fuel vehicle generator dynamic control system according to claim 1, characterized in that: The engine ECU (2) activates the forced power generation logic according to the use of the vehicle air conditioner. When the air conditioner is turned on for longer than the set time, the engine ECU (2) controls the generator (4) to generate power at a set fixed voltage through the generator controller (3). When the voltage is higher than the set voltage, power generation is stopped. After the power generation is stopped, the air conditioner is turned on for a new time. When the time is up, the power generation logic is retriggered. The above logic is repeated until the air conditioner is turned off.

9. A fuel vehicle generator dynamic control system according to any one of claims 4 to 8, characterized in that: The power generation state of the generator (4) controlled by the engine ECU (2) is selected and applied according to the actual application scenario of the vehicle.

10. A method for dynamically controlling a generator of a fuel vehicle, implemented based on a dynamic control system of a generator of a fuel vehicle provided in claim 9, characterized in that: The following steps are involved: S1. The battery voltage / capacity sensor (1) detects changes in the voltage / capacity of the battery (5) and transmits the collected information to the engine ECU (2); S2. The engine ECU (2) determines the engine operating conditions and controls the generator controller (3); S3. The generator controller (3) controls the generator (4) to change the voltage / power in the battery (5); S4. The battery voltage / capacity sensor (1) detects changes in the voltage / capacity of the battery (5) and transmits the collected information to the engine ECU (2) again to start or stop generating electricity.

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