阅读说明：本技术 电动汽车的低速提示音控制策略、控制系统及电动汽车 (Low-speed prompt tone control strategy and control system of electric automobile and electric automobile ) 是由 朱军 曹海波 蔡黎 景华斌 向太鹏 王凳 于 2021-07-30 设计创作，主要内容包括：本申请属于车辆控制技术领域,具体涉及一种电动汽车的低速提示音控制策略,控制策略,包括如下步骤：获取车况信息；基于标定信息,判断车况信息归属的车况状态；根据所述车况状态,由警示器选择执行提示音的运行模式。本申请的控制策略能够基于标定信息,精确判断电动汽车的车况状态,并根据车况状态选择执行提示音运行模式,保证电动汽车的整车车外噪声的声级满足低速提示音标准的同时,避免整车车外噪声过大。本实施例的控制策略第一方面能够保证车内乘客的舒适度以及避免引起车外道路参与者对噪音的抱怨,避免出现扰民的情况。第二方面避免了警示器不必要的功率输出,能够节约能源。第三方面控制策略能够应用在不同车型的电动汽车,适用性好。(The application belongs to the technical field of vehicle control, and particularly relates to a low-speed prompt tone control strategy for an electric automobile, which comprises the following steps: acquiring vehicle condition information; judging the vehicle condition state to which the vehicle condition information belongs based on the calibration information; and selecting an operation mode for executing the prompt tone by the alarm according to the vehicle condition state. The control strategy can accurately judge the vehicle condition state of the electric vehicle based on the calibration information, and select and execute the prompt tone running mode according to the vehicle condition state, so that the noise level of the noise outside the whole vehicle of the electric vehicle is ensured to meet the low-speed prompt tone standard, and the noise outside the whole vehicle is avoided to be overlarge. The first aspect of the control strategy of this embodiment can guarantee the comfort level of the interior passenger and avoid causing the complaining of road participant outside the car to the noise, avoids appearing the condition of disturbing the citizen. The second aspect avoids unnecessary power output of the warning indicator, and can save energy. The third aspect control strategy can be applied to electric automobiles of different automobile types, and the applicability is good.)

1. The low-speed prompt tone control strategy of the electric automobile comprises the following steps:

acquiring vehicle condition information;

judging the vehicle condition state to which the vehicle condition information belongs based on the calibration information;

and selecting and executing a corresponding running mode of the prompt tone by the alarm according to the vehicle condition state.

2. The low speed alert tone control strategy of an electric vehicle according to claim 1, wherein: the vehicle condition information comprises a vehicle speed signal V and an internal combustion engine signal, wherein the internal combustion engine signal comprises an internal combustion engine rotating speed signal n and an internal combustion engine flywheel end torque signal T_f；

The calibration information comprises a hybrid vehicle exterior noise characteristic state and an internal combustion engine vehicle exterior noise characteristic state;

the characteristic state of the mixed external noise is the state of the external noise of the vehicle under the condition that the warning indicator is turned off and the working sound of the internal combustion engine is calibrated to not reach the low-speed prompt sound standard, and the function N is used_{Mix the exterior}(n，T_fAnd V) represents;

the external noise characteristic state of the internal combustion engine is that the working sound of the internal combustion engine is calibrated to reach the target value under the condition that the warning indicator is turned offVehicle condition status at low speed warning tone standard, using function N_{Inside and outside}(n，T_fAnd V) represents.

3. The low speed alert tone control strategy of an electric vehicle according to claim 2, wherein: the operation mode of selecting and executing the corresponding prompt tone by the alarm according to the vehicle condition state comprises the following steps:

when the vehicle condition information is the characteristic state of the external noise of the hybrid vehicle, the warning indicator executes a hybrid warning tone mode, and in the hybrid warning tone mode, the warning tone of the warning indicator is matched with the working sound of the internal combustion engine to reach a low-speed warning tone standard;

and when the vehicle condition information is the characteristic state of the noise outside the internal combustion engine vehicle, the warning indicator executes a closing warning tone mode, and under the closing warning tone mode, the warning indicator closes the warning tone.

4. The low speed alert tone control strategy of an electric vehicle according to claim 3, wherein: the calibration information also comprises a motor vehicle exterior noise characteristic state, wherein the motor vehicle exterior noise characteristic state is a vehicle condition state when the internal combustion engine signal is an invalid value;

the operation mode of executing the warning sound selected by the warning device according to the vehicle condition state further includes:

when the vehicle condition information is that when the noise characteristic state outside the motor vehicle, the attention device executes the pure electric prompt tone mode, under the pure electric prompt tone mode, the attention device sends out the prompt tone that reaches the low-speed prompt tone standard.

5. The low speed alert tone control strategy of an electric vehicle according to claim 3, wherein: the calibration information also comprises a mixed alarm pronunciation characteristic state, and the mixed alarm pronunciation characteristic state is a vehicle condition state when the working sound of the internal combustion engine is calibrated and does not reach the low-speed prompt sound standard;

the pronunciation characteristic state of the hybrid warning device is the same as the vehicle condition state of the hybrid vehicle exterior noise characteristic state.

6. The low speed alert tone control strategy of electric vehicle according to claim 4 or 5, characterized in that: the control strategy also comprises a state signal of a pause switch of the alarm is judged after the step of obtaining the vehicle condition information;

and when the pause switch of the alarm is in an inactivated state, the step of judging the vehicle condition state to which the vehicle condition information belongs based on the calibration information is executed again.

7. The low speed alert tone control strategy of an electric vehicle according to claim 6, wherein: and the judgment of the vehicle condition state to which the vehicle condition information belongs is sequentially executed according to the sequence of the external noise characteristic state of the motor, the external noise characteristic state of the internal combustion engine and the external noise characteristic state of the hybrid vehicle.

8. A control system for a warning tone, comprising:

the signal acquisition module is used for acquiring vehicle condition information;

the information processing module is used for judging the vehicle condition state to which the vehicle condition information belongs according to the calibration information;

and the execution module is used for selecting and executing the running mode of the corresponding prompt tone according to the vehicle condition state.

9. The control system of the alert tone according to claim 8, wherein:

the vehicle condition information acquired by the signal acquisition module comprises a vehicle speed signal V and an internal combustion engine signal, wherein the internal combustion engine signal comprises an internal combustion engine rotating speed signal n and an internal combustion engine flywheel end torque signal T_f；

The calibration information in the information processing module comprises a motor vehicle exterior noise characteristic state, an internal combustion engine vehicle exterior noise characteristic state and a mixed vehicle exterior noise characteristic state;

the characteristic state of the noise outside the motor vehicle is the vehicle condition state when the signal of the internal combustion engine is an invalid value;

the characteristic state of the external noise of the internal combustion engine is the state of the external noise of the internal combustion engine when the alarm is turned off and the working sound of the internal combustion engine reaches the low-speed prompt sound standard, and a function N is used_{Inside and outside}(n，T_fAnd V) represents;

the characteristic state of the mixed external noise is the state of the external noise of the vehicle under the condition that the alarm is closed and the working sound of the internal combustion engine is calibrated to be lower than the low-speed prompt sound standard, and the function N is used_{Mix the exterior}(n，T_fAnd V) represents;

the execution module selects an operation mode for executing the prompt tone according to the vehicle condition state, and comprises the following steps:

when the vehicle condition information is the characteristic state of the external noise of the motor vehicle, the warning device executes an all-electric warning sound mode, and in the all-electric warning sound mode, the warning device sends out a warning sound reaching a low-speed warning sound standard;

when the vehicle condition information is the characteristic state of the noise outside the internal combustion engine vehicle, the warning device executes a closing warning tone mode, and under the closing warning tone mode, the warning device closes the warning tone;

when the vehicle condition information is the external noise characteristic state of the hybrid vehicle, the alarm executes a hybrid prompt tone mode, and under the hybrid prompt tone mode, the prompt tone of the alarm is matched with the working sound of the internal combustion engine to reach the low-speed prompt tone standard.

10. Electric automobile, its characterized in that: comprising a control system according to claim 8 or 9.

Technical Field

The application relates to the technical field of vehicle control, in particular to a low-speed prompt tone control strategy and system for an electric automobile and the electric automobile.

Background

According to the standard requirement of GB/T37153 electric vehicle low speed prompt tone (hereinafter referred to as the low speed prompt tone standard), the hybrid electric vehicle with the pure electric driving mode needs to have the low speed prompt tone function. The low-speed warning tone (hereinafter referred to as "warning tone") of the current electric vehicle is mainly realized by a low-speed pedestrian warning device (VSP). In any driving mode, the sound level, frequency range and frequency shift of the warning tone are set to work according to the pure electric mode.

When part of the hybrid electric vehicle is in a hybrid drive mode or an internal combustion engine drive mode, the noise weighted sound level (total sound level) outside the whole vehicle of the electric vehicle exceeds the set value of the pure electric mode. At this time, the warning sound increases unnecessary noise level inside and outside the vehicle, easily affecting comfort of passengers inside the vehicle and causing complaints about noise by road participants outside the vehicle. Meanwhile, the unnecessary power output of the alarm also causes a certain energy waste.

Therefore, it is urgently needed to develop a low-speed warning sound control strategy for an electric vehicle, so that the hybrid electric vehicle can meet the low-speed warning sound standard and simultaneously avoid the problem of overlarge noise value.

Disclosure of Invention

In view of the above problems, the present application provides a low speed warning tone control strategy for an electric vehicle, which can avoid an excessive noise value while enabling a hybrid electric vehicle to satisfy a low speed warning tone standard.

According to a first aspect of embodiments of the present application, there is provided a low-speed alert tone control strategy for an electric vehicle, including the steps of:

acquiring vehicle condition information;

judging the vehicle condition state to which the vehicle condition information belongs based on the calibration information;

and selecting and executing a corresponding running mode of the prompt tone by the alarm according to the vehicle condition state.

Preferably, the vehicle condition information comprises a vehicle speed signal V and an internal combustion engine signal, and the internal combustion engine signal comprises an internal combustion engine rotating speed signal n and an internal combustion engine flywheel end torque signal T_f；

The calibration information comprises a hybrid vehicle exterior noise characteristic state and an internal combustion engine vehicle exterior noise characteristic state;

the characteristic state of the mixed external noise is the state of the external noise of the vehicle under the condition that the warning indicator is turned off and the working sound of the internal combustion engine is calibrated to not reach the low-speed prompt sound standard, and the function N is used_{Mix the exterior}(n，T_fAnd V) represents;

the characteristic state of the external noise of the internal combustion engine is the state of the external noise of the internal combustion engine when the alarm is turned off and the working sound of the internal combustion engine reaches the low-speed prompt sound standard, and a function N is used_{Inside and outside}(n，T_fAnd V) represents.

Preferably, the operation mode for selecting the execution of the warning tone by the warning device according to the vehicle condition state includes:

when the vehicle condition information is the characteristic state of the external noise of the hybrid vehicle, the warning indicator executes a hybrid warning tone mode, and in the hybrid warning tone mode, the warning tone of the warning indicator is matched with the working sound of the internal combustion engine to reach a low-speed warning tone standard;

and when the vehicle condition information is the characteristic state of the noise outside the internal combustion engine vehicle, the warning indicator executes a closing warning tone mode, and under the closing warning tone mode, the warning indicator closes the warning tone.

Preferably, the calibration information further includes a characteristic state of noise outside the motor vehicle, and the characteristic state of noise outside the motor vehicle is a vehicle condition state when the signal of the internal combustion engine is calibrated to be an invalid value;

the operation mode of executing the warning sound selected by the warning device according to the vehicle condition state further includes:

when the vehicle condition information is that when the noise characteristic state outside the motor vehicle, the attention device executes the pure electric prompt tone mode, under the pure electric prompt tone mode, the attention device sends out the prompt tone that reaches the low-speed prompt tone standard.

Preferably, the calibration information further includes a mixed alarm sounding characteristic state, and the mixed alarm sounding characteristic state is a vehicle condition state when the working sound of the internal combustion engine is calibrated and does not reach the low-speed prompt sound standard;

the pronunciation characteristic state of the hybrid warning device is the same as the vehicle condition state of the hybrid vehicle exterior noise characteristic state.

Preferably, the control strategy further comprises judging a status signal of a pause switch of the alarm after the step of obtaining the vehicle condition information;

and when the pause switch of the alarm is in an inactivated state, the step of judging the vehicle condition state to which the vehicle condition information belongs based on the calibration information is executed again.

Preferably, the determination of the vehicle condition state to which the vehicle condition information belongs is performed in order according to the sequence of the motor vehicle exterior noise characteristic state, the internal combustion engine vehicle exterior noise characteristic state, and the hybrid vehicle exterior noise characteristic state.

According to a second aspect of embodiments of the present application, there is provided a control system of an alert tone, including:

the signal acquisition module is used for acquiring vehicle condition information;

the information processing module is used for judging the vehicle condition state to which the vehicle condition information belongs according to the calibration information;

and the execution module is used for selecting and executing the running mode of the corresponding prompt tone according to the vehicle condition state.

Preferably, the vehicle condition information acquired by the signal acquisition module includes a vehicle speed signal V and an internal combustion engine signal, and the internal combustion engine signal includes an internal combustion engine speed signal n and an internal combustion engine flywheel end torque signal T_f；

The calibration information in the information processing module comprises a motor vehicle exterior noise characteristic state, an internal combustion engine vehicle exterior noise characteristic state and a mixed vehicle exterior noise characteristic state;

the characteristic state of the noise outside the motor vehicle is the vehicle condition state when the signal of the internal combustion engine is an invalid value;

the characteristic state of the external noise of the internal combustion engine is the state of the external noise of the internal combustion engine when the alarm is turned off and the working sound of the internal combustion engine reaches the low-speed prompt sound standard, and a function N is used_{Inside and outside}(n，T_fAnd V) represents;

the characteristic state of the mixed external noise is the state of the external noise of the vehicle under the condition that the alarm is closed and the working sound of the internal combustion engine is calibrated to be lower than the low-speed prompt sound standard, and the function N is used_{Mix the exterior}(n，T_fAnd V) represents;

the execution module selects an operation mode for executing the prompt tone according to the vehicle condition state, and comprises the following steps:

when the vehicle condition information is the characteristic state of the external noise of the motor vehicle, the warning device executes an all-electric warning sound mode, and in the all-electric warning sound mode, the warning device sends out a warning sound reaching a low-speed warning sound standard;

when the vehicle condition information is the characteristic state of the noise outside the internal combustion engine vehicle, the warning device executes a closing warning tone mode, and under the closing warning tone mode, the warning device closes the warning tone;

when the vehicle condition information is the external noise characteristic state of the hybrid vehicle, the alarm executes a hybrid prompt tone mode, and under the hybrid prompt tone mode, the prompt tone of the alarm is matched with the working sound of the internal combustion engine to reach the low-speed prompt tone standard.

According to a third aspect of embodiments of the present application, there is provided an electric vehicle including the aforementioned control system of the alert tone.

The control strategy can accurately judge the vehicle condition state of the electric vehicle based on the calibration information, and select and execute the prompt tone running mode according to the vehicle condition state, so that the noise level of the noise outside the whole vehicle of the electric vehicle is ensured to meet the low-speed prompt tone standard, and the noise outside the whole vehicle is avoided to be overlarge. The first aspect of the control strategy of this embodiment can guarantee the comfort level of the interior passenger and avoid causing the complaining of road participant outside the car to the noise, avoids appearing the condition of disturbing the citizen. The second aspect avoids unnecessary power output of the warning indicator, and can save energy. The third aspect control strategy can be applied to electric automobiles of different automobile types, and the applicability is good.

Drawings

Fig. 1 is a schematic diagram of an execution procedure of the control strategy of the present application.

Detailed Description

The following is further detailed by the specific embodiments:

the embodiment provides a low-speed prompt tone control strategy of an electric automobile, which comprises the following steps:

s002: acquiring vehicle condition information;

the method for acquiring the vehicle condition information is to sample a CAN signal of the electric vehicle in real time by a fixed period query method through a Vehicle Control Unit (VCU) in the electric control system in a starting state of the electric vehicle so as to acquire the current vehicle condition information of the electric vehicle.

In this embodiment, the vehicle condition information mainly includes: a vehicle speed signal v and an internal combustion engine signal, preferably an internal combustion engine speed signal n and an internal combustion engine flywheel end torque signal Tf. In some embodiments, to ensure that more detailed vehicle conditions are obtained, the vehicle condition information further includes information such as a drive mode signal, a shift position signal V, and a state signal of the pause switch VSP-off. The driving mode signals specifically include an electric drive only mode EVD, a hybrid drive mode HEVD, and an internal combustion engine drive mode ICED.

And S004, judging the vehicle condition state to which the vehicle condition information belongs based on the calibration information.

The calibration information comprises a vehicle condition state when the internal combustion engine signal is an invalid value, and is defined as a characteristic state of the noise outside the motor vehicle.

Specifically, the electric automobile is driven by the motor only in the pure electric driving mode in the low-speed driving state, the internal combustion engine does not work, and the internal combustion engine speed signal n and the internal combustion engine flywheel end torque signal T_fThe working point is marked as the characteristic state of the noise outside the motor vehicle as an invalid value by a function N_{Electric appliance}(n，T_fAnd V) represents.

The calibration information comprises the external noise characteristic state of the internal combustion engine, and the external noise characteristic state of the internal combustion engine is the vehicle condition state when the working sound of the internal combustion engine reaches the low-speed prompt sound standard under the condition that the alarm is turned off.

Specifically, the electric automobile compares the working sound of the internal combustion engine with the low-speed prompt tone standard in a low-speed running state in a hybrid driving mode or an internal combustion engine driving mode and in a state of closing an alarm, calibrates the working condition point when the working sound of the internal combustion engine reaches the low-speed prompt tone standard, calibrates the working condition as the characteristic state of the external noise of the internal combustion engine, and uses a function N_{Inside and outside}(n，T_fAnd V) represents.

It should be noted that the internal combustion engine signal in this embodiment is an invalid value, specifically, when the internal combustion engine is not in operation, the internal combustion engine speed signal n and the internal combustion engine flywheel end torque signal T are the invalid values_fIs zero; or the internal combustion engine speed signal n and the internal combustion engine flywheel end torque signal T_fIs not available.

In this embodiment, the calibration information includes a characteristic state of the hybrid vehicle exterior noise, and the vehicle condition state in which the operating sound of the internal combustion engine does not reach the low speed prompt sound standard is calibrated when the characteristic state of the hybrid vehicle exterior noise is the turn-off alarm.

Specifically, the electric automobile compares the working sound of the internal combustion engine with the low-speed prompt tone standard in a hybrid driving mode or an internal combustion engine driving mode in a low-speed driving state and in a state of closing an alarm, calibrates the working condition point of the internal combustion engine, which does not reach the low-speed prompt tone standard, as a hybrid vehicle-exterior noise characteristic state, and uses a function N_{Mix the exterior}(n，T_fAnd V) represents.

Judging the vehicle condition state of the electric vehicle specifically by judging that the vehicle condition information belongs to the function N_{Electric appliance}(n，T_fV) or N_{Inside and outside}(n，T_fV) or N_{Mix the exterior}(n，T_fAnd V), namely correspondingly judging whether the electric automobile is in a motor vehicle exterior noise characteristic state or an internal combustion engine vehicle exterior noise characteristic state or a mixed vehicle exterior noise characteristic state.

And S006, selecting and executing the running mode of the corresponding prompt tone by the alarm according to the vehicle condition state.

In the embodiment, the operation modes of the alert tone include a pure-electric alert tone mode, an off alert tone mode, and a mixed alert tone mode.

According to the vehicle condition state, the selection of the execution operation mode by the alarm specifically comprises the following steps: and when the vehicle condition information is the characteristic state of the noise outside the motor vehicle, the alarm executes the pure electric prompt tone mode.

Specifically, the pure electric prompt tone mode is a mode in which the warning indicator gives out a warning tone according to a low-speed prompt tone standard when the electric vehicle is in a low-speed driving state in the pure electric driving mode. Because under pure electric drive mode, mainly through motor drive vehicle removal, the work sound of motor is less. When the vehicle condition information is the characteristic state of the external noise of the motor vehicle, the warning tone is mainly sent out through the warning device so as to ensure that the sound level of the external noise of the whole vehicle reaches the low-speed warning tone standard. The low-speed running in the present embodiment refers to a case where the running speed of the electric vehicle is 20km/h or less. The low-speed prompt tone standard is that the information of the sound level limit value, the frequency requirement, the frequency shift, the sound type and the like of the noise outside the electric automobile conforms to the regulation of GB/T37153 electric automobile low-speed prompt tone item 4.

According to the vehicle condition state, the selection of the execution operation mode by the alarm further comprises: and when the vehicle condition information is the characteristic state of the noise outside the internal combustion engine, the alarm executes a closing prompt tone mode.

Specifically, the off warning sound mode is a mode in which the warning indicator is in an off state when the electric vehicle is in a hybrid driving mode or an internal combustion engine driving mode in a low-speed driving state. Because some motorcycle types are in a hybrid driving mode or an internal combustion engine driving mode, the electric automobile needs to drive the automobile to move through the internal combustion engine, the working sound of the internal combustion engine is large, the working sound of the internal combustion engine can enable the sound level of noise outside the whole automobile to reach the low-speed prompt sound standard, and the alarm does not need to give out prompt sound.

According to the vehicle condition state, the selection of the execution operation mode by the alarm further comprises: and when the vehicle condition information is the characteristic state of the mixed external noise, the alarm executes a mixed prompt tone mode.

Specifically, the hybrid warning sound mode is a mode in which the warning sound of the warning indicator and the operating sound of the internal combustion engine act together when the electric vehicle is in a low-speed driving state in the hybrid driving mode or the internal combustion engine driving mode. Because the working sound of the internal combustion engine can not make the sound level of the external noise of the whole vehicle reach the low-speed prompt sound standard under the characteristic state of the external noise of a mixed vehicle, the alarm needs to send the prompt sound to be matched with the working sound of the internal combustion engine, so that the sound level of the external noise of the whole vehicle reaches the low-speed prompt sound standard.

In some embodiments, since the warning sound of the warning device and the working sound of the internal combustion engine are required to act together when the external noise characteristic state is mixed, when the external noise characteristic state is calibrated in the step S004, the working condition point when the working sound of the internal combustion engine does not reach the low-speed warning sound standard can be calibrated according to the pronunciation characteristic of the warning device, the working condition is calibrated to be the pronunciation characteristic state of the mixed warning device, and the function N is used for calibrating the working condition to be the pronunciation characteristic state of the mixed warning device_{Police mixing}(N_{Mix the exterior}(n，T_fV), v). It should be noted that the pronunciation characteristic state of the hybrid warning device is the same as the working condition of the hybrid vehicle exterior noise characteristic state.

Note that, since the policy in this embodiment needs to be implemented in the state where the pause switch VSP-off of the alarm is not activated, after the step S002 is performed, the policy further includes step S003: judging a state signal of a pause switch of the alarm; when the pause switch of the alarm is in the inactive state, the step S004 is performed again.

As shown in fig. 1, when the execution program of the control strategy is executed, the determination of the vehicle condition state of the electric vehicle may be performed in order of the motor vehicle exterior noise characteristic state, the internal combustion engine vehicle exterior noise characteristic state, and the hybrid vehicle exterior noise characteristic state.

When the alarm in fig. 1 acquires the vehicle condition information and the pause switch is in the inactive state, it is first determined whether the electric vehicle is in the external noise characteristic state of the motor vehicle, and when the internal combustion engine signal in the vehicle condition information is an invalid value (pure electric drive mode), the electric vehicle is in the external noise characteristic state of the motor vehicle, and the alarm executes the pure electric prompt tone mode.

When the internal combustion engine signal in the vehicle condition information is not an invalid value (non-pure electric driving mode), judging whether the electric vehicle is in a hybrid external noise characteristic state, namely judging whether the vehicle speed signal, the internal combustion engine rotating speed signal and the internal combustion engine flywheel end torque signal belong to a function N_{Inside and outside}(n，T_fV) when the engine signal and the vehicle speed signal belong to the function N_{Inside and outside}(n，T_fAnd V), the electric automobile is in a noise characteristic state outside the internal combustion engine, and the alarm executes a closing prompt tone mode.

When the signals of internal combustion engine and vehicle speed are not ascribed to function N_{Inside and outside}(n，T_fAnd V), the electric automobile is in a hybrid external noise characteristic state, and the alarm executes a hybrid prompt tone mode.

The control strategy in the embodiment can be applied to electric vehicles of different vehicle types. In the whole low-speed running state of part of electric automobiles, the working volume of the internal combustion engine can reach the low-speed prompt tone standard, namely, the electric automobiles are in the external noise characteristic state of the internal combustion engine vehicles, and the alarm executes the closing prompt tone mode.

In the whole low-speed running state of part of electric automobiles, the working volume of the internal-combustion engine cannot reach the low-speed prompt tone standard, namely, the electric automobiles are in a mixed external noise characteristic state, and the alarm executes a mixed prompt tone mode.

Under the low-speed running state, when part of the electric automobile does not reach the critical speed, the working volume of the internal combustion engine cannot reach the low-speed prompt tone standard, and when the electric automobile reaches or exceeds the critical speed, the working volume of the internal combustion engine reaches the low-speed prompt tone standard. That is, the electric vehicle is in a hybrid vehicle exterior noise characteristic state when the critical speed is not reached, and the alarm executes a hybrid prompt tone mode. When the electric automobile reaches or exceeds the critical speed, the electric automobile is in the external noise characteristic state of the internal combustion engine car, and the alarm executes the closing prompt tone mode.

It should be noted that the function N in this embodiment is a function obtained through a large number of calculations according to the collected actual working condition values, and specific functions are not listed in this embodiment because of the actual working condition values of different vehicle types. The engine signal is not limited to the engine speed signal and the engine flywheel end torque signal described in the present embodiment, and may be a signal of operating conditions of other components of the internal combustion engine.

The control strategy of the embodiment can ensure that the sound level of the noise outside the whole automobile of the electric automobile meets the low-speed prompt sound standard, and simultaneously avoids the overlarge noise outside the whole automobile. The first aspect of the control strategy of this embodiment can guarantee the comfort level of the interior passenger and avoid causing the complaining of road participant outside the car to the noise, avoids appearing the condition of disturbing the citizen. The second aspect avoids unnecessary power output of the warning indicator, and can save energy. The third aspect can be applicable to electric vehicles of different vehicle types, and the suitability is high.

This embodiment provides a control system of a warning tone based on a control strategy, including:

the signal acquisition module is used for acquiring vehicle condition information;

the information processing module is used for judging the vehicle condition state to which the vehicle condition information belongs according to the calibration information;

and the execution module is used for selecting and executing the running mode of the corresponding prompt tone according to the vehicle condition state.

The vehicle condition information acquired by the signal acquisition module comprises a vehicle speed signal V, an internal combustion engine rotating speed signal n and an internal combustion engine flywheel end torque signal T_f；

The calibration information in the information processing module comprises a motor vehicle exterior noise characteristic state, an internal combustion engine vehicle exterior noise characteristic state and a mixed vehicle exterior noise characteristic state;

the characteristic state of the noise outside the motor vehicle is the vehicle condition state when the signal of the internal combustion engine is an invalid value;

the external noise characteristic state of the internal combustion engine is the state of the vehicle condition when the working sound of the internal combustion engine reaches the low-speed prompt sound standard under the condition that the alarm is turned off, and the function N is used_{Inside and outside}(n，T_fAnd V) represents;

the hybrid vehicle exterior noise characteristic state is a vehicle condition state in which the working sound of the internal combustion engine is calibrated to be lower than the low-speed prompt sound standard under the condition that the alarm is turned offBy a function N_{Mix the exterior}(n，T_fAnd V) represents.

The execution module selects an operation mode for executing the prompt tone according to the vehicle condition state, and comprises the following steps:

when the vehicle condition information is the characteristic state of the external noise of the motor vehicle, the warning device executes an all-electric warning tone mode, and in the all-electric warning tone mode, the warning device sends out a warning tone reaching the low-speed warning tone standard;

when the vehicle condition information is the characteristic state of the noise outside the internal combustion engine vehicle, the warning device executes a closing warning tone mode, and under the closing warning tone mode, the warning device closes the warning tone;

when the vehicle condition information is the external noise characteristic state of the hybrid vehicle, the alarm executes a hybrid prompt tone mode, and under the hybrid prompt tone mode, the prompt tone of the alarm is matched with the working sound of the internal combustion engine to reach the low-speed prompt tone standard.

With regard to the system in the above embodiment, the specific steps in which the respective modules perform operations have been described in detail in the embodiment related to the method, and are not described in detail herein.

Specifically, the system may be implemented by a VCU of the vehicle itself, or may be implemented by an independent control device such as a CPU and an MCU.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.

It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.

It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.