CN107264512A - A kind of electricity-generating control method of hybrid electric vehicle, equipment and system - Google Patents

Abstract

The invention provides a power generation control method of a hybrid electric vehicle, the hybrid electric vehicle includes an engine system and a battery, the engine system includes an engine and a generator, and the method includes: setting a first threshold and a second threshold; obtaining battery temperature and generator temperature; comparing the battery temperature with the first threshold and comparing the generator temperature with the second threshold; if the battery temperature is greater than the first threshold or the If the temperature of the generator is greater than the second threshold, the generator system is controlled to work in a reduced-power generation mode; otherwise, the generator system is controlled to work in a high-efficiency power generation mode. The invention prolongs the service life of the battery, the generator and the engine by rationally controlling the power generation mode of the engine system.

Description

Method, device and system for controlling power generation of a hybrid electric vehicle

technical field

The invention relates to the technical field of hybrid electric vehicles, in particular to a method, device and system for controlling power generation of a hybrid electric vehicle.

Background technique

With the improvement of people's awareness of environmental protection, energy saving and environmental protection have gradually integrated into our daily life. The transformation of the automobile industry has also become a consensus, but the existing pure electric vehicles have the problem of limited cruising range, and if the battery is over-discharged, it will damage the life of the battery.

As a transitional product from fuel vehicles to new energy vehicles, hybrid vehicles have gradually been recognized by everyone. It adds a gasoline engine as a backup power on the basis of pure electric vehicles. Electric vehicles are driven by electricity. The engine can supply power to drive the motor of the whole vehicle, add light to the battery, and realize charging while running. Hybrid electric vehicles have many significant advantages, such as multiple power sources, energy saving, and low emissions, and have drawn great attention from all over the world. For example, the hybrid vehicle described in Japanese Patent Application Laid-Open No. 9-298802 is equipped with an engine driving the front wheels and a motor generator driving the rear wheels, and when the vehicle decelerates, the electric energy generated by the regenerative braking of the motor generator Charge to battery.

The main power sources of hybrid electric vehicles are batteries, engines and generators, but at this stage the batteries, generators and engines have short lifespans. How to make good use of batteries, generators and engines, and prolong the life of batteries, generators and engines has become the primary problem for car manufacturers. The above patent documents do not solve this problem.

Contents of the invention

The purpose of the present invention is to provide a power generation control method, device and system of a hybrid electric vehicle, so that the battery, generator and engine work in a suitable temperature range, thereby solving the battery, generator and engine life of the existing hybrid electric vehicle short question.

In order to solve the above-mentioned technical problems, a specific embodiment of the present invention firstly proposes a power generation control method of a hybrid electric vehicle, the hybrid electric vehicle includes an engine system and a battery, the engine system includes an engine and a generator, and the method includes: Set a first threshold and a second threshold; acquire battery temperature and generator temperature; compare the battery temperature with the first threshold, compare the generator temperature with the second threshold; if the battery If the temperature is greater than the first threshold and/or the temperature of the generator is greater than the second threshold, the generator system is controlled to work in a reduced power generation mode; otherwise, the generator system is controlled to work in a high-efficiency power generation mode.

In a preferred embodiment of the present invention, the method further includes: setting a third threshold; acquiring the cylinder head temperature and the coolant temperature; comparing the cylinder head temperature and the coolant temperature with the third threshold respectively ; if both the cylinder head temperature and the coolant temperature are less than the third threshold, control the generator system to be in the startup state; otherwise, control the engine system to be in the shutdown state.

In a preferred embodiment of the present invention, the method further includes: setting a fourth threshold and a fifth threshold; comparing the cylinder head temperature and the coolant temperature with the fourth threshold; if the cylinder If the head temperature and/or the coolant temperature is greater than the fourth threshold, the cooling fan is controlled to be turned on.

In a preferred embodiment of the present invention, the method further includes: comparing the cylinder head temperature and the coolant temperature with the fifth threshold respectively; if the cylinder head temperature and the coolant temperature are both is less than the fifth threshold, the cooling fan is controlled to be in the off state.

In a preferred embodiment of the present invention, the hybrid vehicle further includes an alarm device, and the method further includes: setting a sixth threshold; comparing the cylinder head temperature and the coolant temperature with the sixth threshold; If the temperature of the cylinder head and/or the temperature of the coolant is greater than the sixth threshold, the alarm device is controlled to send out an alarm signal.

In order to solve the above technical problems, the specific embodiment of the present invention also provides a power generation control device for a hybrid electric vehicle, the hybrid electric vehicle includes an engine system and a battery, the engine system includes an engine and a generator, and the device includes : a threshold setting module, used to set the first threshold and a second threshold; a battery temperature obtaining module, used to obtain the battery temperature; a generator temperature obtaining module, used to obtain the generator temperature; a comparison module, used to compare the battery temperature comparing with the first threshold, comparing the generator temperature with the second threshold; a control module, if the battery temperature is greater than the first threshold and/or the generator temperature is greater than the second threshold The second threshold is used to control the generator system to work in a reduced power generation mode; otherwise, it is used to control the generator system to work in a high-efficiency power generation mode.

In a preferred embodiment of the present invention, the device further includes: a cylinder head temperature acquisition module, used to acquire the cylinder head temperature; a coolant temperature acquisition module, used to acquire the coolant temperature. Wherein, the threshold setting module is also used to set a third threshold: the comparison module is also used to compare the cylinder head temperature and the coolant temperature with the third threshold respectively; if the cylinder head temperature and the coolant temperature are both lower than the third threshold, the control module is further configured to control the generator system to be in the startup state, otherwise control the engine system to be in the shutdown state.

In a preferred embodiment of the present invention, the hybrid vehicle further includes a cooling fan, and the threshold setting module is also used to set a fourth threshold; the comparison module is also used to compare the cylinder head temperature and the coolant The temperature is compared with the fourth threshold; if the cylinder head temperature and/or the cooling liquid temperature is greater than the fourth threshold, the control module is also used to control the cooling fan to be in an on state.

In a preferred embodiment of the present invention, the threshold setting module is also used to set a fifth threshold; the comparison module is also used to compare the cylinder head temperature and the coolant temperature with the fifth threshold respectively ; if both the cylinder head temperature and the cooling liquid temperature are less than the fifth threshold, the control module is further used to control the cooling fan to be in an off state.

In a preferred embodiment of the present invention, the threshold setting module is also used to set a sixth threshold; the comparison module is also used to compare the cylinder head temperature and the coolant temperature with the sixth threshold respectively; if If the temperature of the cylinder head and/or the temperature of the coolant is greater than the sixth threshold, the control module is also used to control the alarm device to send out an alarm signal.

In order to solve the above technical problems, the specific embodiment of the present invention also provides a power generation control system of a hybrid electric vehicle, the system includes a hybrid electric vehicle and the power generation control device.

The invention provides a power generation control method, device and system for a hybrid electric vehicle. By monitoring the temperature of the cylinder head, the temperature of the coolant, the temperature of the generator and the temperature of the battery, the power generation mode is entered or the power generation is stopped when the temperature is higher than a specific threshold. , thereby prolonging the service life of batteries, generators and engines.

Description of drawings

Fig. 1 is a structural frame diagram of a power generation control system of a hybrid electric vehicle according to a specific embodiment of the present invention;

Fig. 2 is a structural block diagram of a power generation control device of a hybrid electric vehicle according to a specific embodiment of the present invention;

Fig. 3 is a structural block diagram of a power generation control device of a hybrid electric vehicle according to another specific embodiment of the present invention;

Fig. 4 is a flow chart of a power generation control method of a hybrid electric vehicle according to a specific embodiment of the present invention;

Fig. 5 is a flowchart of a method for controlling power generation of a hybrid electric vehicle according to another specific embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them.

Elements/components with the same or similar numbers used in the drawings and the embodiments are used to represent the same or similar parts. Also, the drawings are schematic only, elements thereof not necessarily to scale.

Fig. 1 is a structural frame diagram of a power generation control system of a hybrid electric vehicle according to a specific embodiment of the present invention. Referring to FIG. 1 , the power generation control system 100 includes a power generation control device 200 , an engine system 300 connected to the power generation control device 200 , a cooling fan 400 and a battery management system 500 . Among them, the engine system 300 includes a generator 301 , an engine 302 and an ECU (engine control system) 303 . The battery management system 500 includes a battery 501 . In a specific implementation, the battery management system 500 may be a battery management system with equalization, or a battery management system without equalization. The battery 501 may be n groups of single cells or n groups of battery packs.

In the power generation control system 100, the power generation control device 200 acquires battery temperature, generator temperature, cylinder head temperature and coolant temperature, and compares these temperatures with preset thresholds, thereby controlling whether the engine starts and shuts down, controls the generator power generation mode and control whether the cooling fan is on or not.

Fig. 2 is a structural block diagram of a power generation control device of a hybrid electric vehicle according to a specific embodiment of the present invention. Referring to FIG. 2 , the power generation control device 200 includes a threshold setting module 201 , a battery temperature acquisition module 202 , a generator temperature acquisition module 203 , a comparison module 204 and a control module 205 . In a specific implementation, each module in the power generation control device 200 can be connected and communicated through a CAN bus.

The threshold setting module 201 is used to set the first threshold and the second threshold. Wherein, the first threshold may be a battery temperature high temperature threshold; the second threshold may be a generator temperature high temperature threshold.

The battery temperature acquiring module 202 is used to acquire the battery temperature. In a specific implementation, the battery temperature may be detected by the battery management system 500 and transmitted to the battery temperature acquisition module 202 through the CAN bus.

The generator temperature acquiring module 203 is used to acquire the generator temperature. In a specific implementation, a generator temperature sensor for detecting the temperature of the generator may be provided, and the generator temperature sensor may be provided in the engine system 300 or in the power generation control device 200 .

The comparison module 204 compares the battery temperature to a first threshold; compares the generator temperature to a second threshold.

If the battery temperature is greater than the first threshold and/or the generator temperature is greater than the second threshold, the control module 205 is used to control the engine system 300 to work in a reduced power generation mode. Thereby prolonging the service life of batteries, generators and engines.

If the battery temperature is equal to or lower than the first threshold and the generator temperature is equal to or lower than the second threshold, the control module 205 is used to control the engine system 300 to work in a high-efficiency power generation mode. Thereby improving the working efficiency of the engine, saving energy loss, reducing environmental pollution and so on.

In another specific implementation manner, the power generation control device 200 may further include an alarm device (not shown in the figure). When the battery temperature is greater than the first threshold, while controlling the engine system 300 to work in the reduced power generation mode, the alarm device can also be controlled to send a high battery temperature warning message to remind the driver to prevent the high temperature of the battery from affecting the service life of the battery. When the temperature of the generator is greater than the second threshold, while the engine system 300 is controlled to work in the reduced power generation mode, the alarm device can also be controlled to send a generator high temperature warning message to remind the driver to prevent the generator from being damaged due to high temperature. The warning device may be a signal lamp or a sounder.

In another specific implementation manner, the power generation control device 200 may be improved on the basis of an existing vehicle controller (VCU).

Fig. 3 is a structural block diagram of a power generation control device of a hybrid electric vehicle according to another specific embodiment of the present invention. Referring to FIG. 3 , the power generation control device 200 further includes a cylinder head temperature acquisition module 206 and a coolant temperature acquisition module 207 . in:

The threshold setting module 201 is also used to set a third threshold. In particular embodiments, the third threshold may be an engine start temperature threshold d.

The cylinder head temperature acquiring module 206 is used to acquire the cylinder head temperature. In specific implementation, when the engine is an electronic fuel injection type, the engine control system 303 can detect the cylinder head temperature; when the engine is a carburetor type, a cylinder head temperature sensor for detecting the cylinder head temperature can be set, the cylinder head The temperature sensor may be provided in the engine system 300 or in the power generation control device 200 .

The coolant temperature acquiring module 207 is used to acquire the coolant temperature.

The comparison module 204 is also used to compare the cylinder head temperature and the coolant temperature with the third threshold respectively.

If both the cylinder head temperature and the coolant temperature are lower than the third threshold, the control module 205 is further used to control the engine 302 to be in the starting state.

If the cylinder head temperature and/or the coolant temperature are equal to or greater than the third threshold, the control module 205 is also used to control the engine 302 to be in a shutdown state (ie, flameout state), so as to prevent the engine 302 from being damaged due to high temperature.

In another specific implementation manner, the threshold setting module 201 may also be used to set a sixth threshold. Wherein, the sixth threshold may be a high temperature warning threshold.

When the engine 302 is in the starting state, the cylinder head temperature and the coolant temperature may be compared with the sixth threshold respectively. If the cylinder head temperature and/or the cooling liquid temperature are greater than the sixth threshold, the control alarm device sends out an alarm signal.

The alarm signal sent by the alarm device can be that the signal light flashes, or it can also issue alarm sounds such as buzzing.

In another specific implementation manner, the threshold setting module 201 may also be used to set the fourth threshold and the fifth threshold. Wherein, the fourth threshold may be the temperature threshold at which the cooling fan 400 is turned on; the fifth threshold may be the temperature threshold at which the cooling fan 400 is turned off. The cooling fan 400 may be an engine cooling fan.

When the engine 302 is in the starting state, the comparison module 204 can also be used to compare the cylinder head temperature and the coolant temperature with the fourth threshold respectively. If the cylinder head temperature and/or the coolant temperature are greater than the fourth threshold, the control module 205 can also be used to control the cooling fan 400 to be turned on, so as to dissipate heat to the engine 302 and prevent the engine block from being damaged due to excessive starting temperature.

When the engine is in the starting state, the comparison module 204 can also be used to compare the cylinder head temperature and the coolant temperature with the fifth threshold respectively. If both the cylinder head temperature and the coolant temperature are lower than the fifth threshold, the control module 205 may also control the cooling fan 400 to be turned off, so that the engine 302 works in a high-efficiency temperature range.

Fig. 4 is a flow chart of a power generation control method for a hybrid electric vehicle provided by a specific embodiment of the present invention. Referring to Figure 4, the method includes:

S401: Set a first threshold and a second threshold. In a specific implementation manner, the first threshold may be the high temperature threshold of the battery; the second threshold may be the high temperature threshold of the generator.

S402: Obtain battery temperature and generator temperature.

S403: Comparing the battery temperature with a first threshold; comparing the generator temperature with a second threshold.

S404: If the battery temperature is greater than the first threshold and/or the generator temperature is greater than the second threshold, control the engine system to work in a reduced power generation mode.

In a specific embodiment, when the battery temperature is greater than the first threshold, while controlling the engine system to work in the reduced power generation mode, the alarm device can also be controlled to send a high battery temperature warning message to remind the driver to prevent the high temperature of the battery from affecting the service life of the battery . When the temperature of the generator is greater than the second threshold, while the engine system is controlled to work in the reduced power generation mode, the alarm device can also be controlled to send a generator high temperature warning message to remind the driver to prevent the generator from being damaged due to high temperature.

S405: If the battery temperature is equal to or lower than the first threshold and the generator temperature is equal to or lower than the second threshold, that is, the determination result of step S403 is No, control the engine system to work in the high-efficiency power generation mode.

Fig. 5 is a flow chart of a power generation control method for a hybrid electric vehicle provided in another specific embodiment of the present invention. Referring to Fig. 5, the method further includes:

S501: Set a third threshold. In particular implementations, the third threshold may be an engine start temperature threshold.

S502: Obtain cylinder head temperature and coolant temperature.

S503: Comparing the cylinder head temperature and the coolant temperature with the third threshold respectively, and judging whether the cylinder head temperature and the coolant temperature are both smaller than the third threshold.

S504: If both the cylinder head temperature and the coolant temperature are less than the third threshold, control the engine system to be in the starting state.

S505: If the cylinder head temperature and/or the coolant temperature are equal to or greater than the third threshold, that is, the judgment result of step S503 is No, control the engine system to be in the off state (ie, flameout state), thereby preventing the engine from being damaged due to high temperature.

In another specific implementation manner, a fourth threshold and a fifth threshold may also be set. Wherein, the fourth threshold may be a temperature threshold for turning on the cooling fan; the fifth threshold may be a temperature threshold for turning off the cooling fan. The cooling fan may be an engine cooling fan.

When the engine is in a starting state, the cylinder head temperature and the coolant temperature can be compared with the fourth threshold respectively. If the cylinder head temperature and/or the coolant temperature are greater than the fourth threshold, the cooling fan is controlled to be turned on to dissipate heat to the engine and prevent the cylinder block from being damaged due to excessive starting temperature.

When the engine is in the starting state, the cylinder head temperature and the coolant temperature can also be compared with the fifth threshold respectively. If both the cylinder head temperature and the coolant temperature are less than the fifth threshold value, the cooling fan is controlled to be turned off, so that the engine works in a high-efficiency temperature zone.

In another specific implementation manner, a sixth threshold may also be set. Wherein, the sixth threshold may be a high temperature warning threshold.

When the engine is in a starting state, the cylinder head temperature and the coolant temperature may be compared with the sixth threshold respectively. If the cylinder head temperature and/or the cooling liquid temperature are greater than the sixth threshold, the control alarm device sends out an alarm signal.

Wherein, the alarm signal issued by the alarm device may be that a signal light flashes, or it may issue an alarm sound such as a buzzer.

As mentioned above, the present invention provides a power generation control method for a hybrid electric vehicle. By monitoring the temperature of the cylinder head, the temperature of the coolant, the temperature of the generator and the temperature of the battery, when the temperature is higher than a certain threshold, it enters the power generation mode or stops the power generation. , thereby prolonging the service life of batteries, generators and engines.

The above-mentioned embodiments of the present invention can be implemented in various hardware, software codes or a combination of both. For example, the embodiments of the present invention may also be program codes for executing the above method in a digital signal processor (Digital Signal Processor, DSP). The invention may also involve various functions performed by a computer processor, digital signal processor, microprocessor, or Field Programmable Gate Array (FPGA). The aforementioned processors may be configured in accordance with the present invention to perform specific tasks by executing machine-readable software code or firmware code that defines specific methods disclosed herein. The software code or firmware code can be developed into different programming languages and different formats or forms. The software code can also be compiled for different target platforms. However, different code styles, types, and languages for software code and other types of configuration code for performing tasks in accordance with the present invention do not depart from the spirit and scope of the present invention.

The above descriptions are only illustrative specific implementation methods of the present invention. Any equivalent changes and modifications made by those skilled in the art shall fall within the protection scope of the present invention without departing from the concepts and principles of the present invention.

Claims (11)

1. A power generation control method of a hybrid vehicle, the hybrid vehicle comprising an engine system and a battery, the engine system comprising a motor and a generator, wherein the method comprises: setting a first threshold and a second threshold; Obtain battery temperature and generator temperature; comparing the battery temperature to the first threshold and comparing the generator temperature to the second threshold; If the battery temperature is greater than the first threshold and/or the generator temperature is greater than the second threshold, the generator system is controlled to work in a reduced power generation mode; otherwise, the generator system is controlled to work in High-efficiency power generation mode. 2. The power generation control method according to claim 1, wherein the method further comprises: Set the third threshold; Obtain cylinder head temperature and coolant temperature; comparing the cylinder head temperature and the coolant temperature with the third threshold; If the cylinder head temperature and the coolant temperature are less than the third threshold, the engine system is controlled to be in the start state; otherwise, the engine system is controlled to be in the off state. 3. The power generation control method according to claim 2, wherein the hybrid vehicle further comprises a cooling fan, wherein the method further comprises: Set the fourth threshold; comparing the cylinder head temperature and the coolant temperature with the fourth threshold; If the cylinder head temperature and/or the coolant temperature are greater than the fourth threshold, the cooling fan is controlled to be turned on. 4. The power generation control method according to claim 3, wherein the method further comprises: Set the fifth threshold; comparing the cylinder head temperature and the coolant temperature with the fifth threshold; If both the cylinder head temperature and the coolant temperature are lower than the fifth threshold, the cooling fan is controlled to be in an off state. 5. The power generation control method according to claim 2, wherein the hybrid vehicle further comprises an alarm device, wherein the method further comprises: Set the sixth threshold; comparing the cylinder head temperature and the coolant temperature with a sixth threshold; If the temperature of the cylinder head and/or the temperature of the coolant is greater than the sixth threshold, the alarm device is controlled to send out an alarm signal. 6. A power generation control device for a hybrid vehicle, the hybrid vehicle comprising an engine system and a battery, the engine system comprising a motor and a generator, characterized in that the device comprises: a threshold setting module, configured to set a first threshold and a second threshold; The battery temperature acquisition module is used to acquire the battery temperature; Generator temperature acquisition module, used to obtain generator temperature; a comparison module, configured to compare the battery temperature with the first threshold, and compare the generator temperature with the second threshold; A control module, if the battery temperature is greater than the first threshold and/or the generator temperature is greater than the second threshold, for controlling the generator system to work in a reduced power generation mode, otherwise, for controlling The generator system works in a high-efficiency power generation mode. 7. The power generation control device according to claim 6, wherein the device further comprises: The cylinder head temperature acquisition module is used to obtain the cylinder head temperature; Coolant temperature acquisition module, used to obtain the coolant temperature; Wherein, the threshold setting module is also used to set a third threshold: the comparison module is also used to compare the cylinder head temperature and the coolant temperature with the third threshold respectively; if the cylinder head temperature and the coolant temperature are both lower than the third threshold, the control module is further configured to control the generator system to be in the startup state, otherwise control the engine system to be in the shutdown state. 8. The power generation control device according to claim 7, wherein the hybrid vehicle further comprises a cooling fan, wherein the threshold setting module is also used to set a fourth threshold; the comparison module is also used to set the The cylinder head temperature and the coolant temperature are respectively compared with the fourth threshold; if the cylinder head temperature and/or the coolant temperature is greater than the fourth threshold, the control module is also used to control the The cooling fan is on. 9. The power generation control device according to claim 8, wherein the threshold setting module is also used to set a fifth threshold; the comparison module is also used to set the cylinder head temperature and the coolant temperature respectively comparing with the fifth threshold; if both the cylinder head temperature and the cooling liquid temperature are lower than the fifth threshold, the control module is further used to control the cooling fan to be in an off state. 10. The power generation control device according to claim 7, the hybrid vehicle further comprising an alarm device, wherein the threshold setting module is also used to set a sixth threshold; the comparison module is also used to set the The cylinder head temperature and the coolant temperature are respectively compared with the sixth threshold; if the cylinder head temperature and/or the coolant temperature is greater than the sixth threshold, the control module is also used to control the alarm device to send out Alarm. 11. A hybrid electric vehicle, characterized in that the hybrid electric vehicle comprises the power generation control device according to any one of claims 6-10.