CN102135453A - Method and system for monitoring motor temperature as well as method and system for controlling motor power - Google Patents
Method and system for monitoring motor temperature as well as method and system for controlling motor power Download PDFInfo
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Abstract
The invention discloses a method for monitoring motor temperature. The method comprises the following steps: arranging n temperature sensors for detecting the current temperature T of a motor, wherein, n is not less than 2; reading detection data from the n temperature sensors; and obtaining the current temperature T of the motor on the basis of the detection data from the temperature sensors which normally work in the n temperature sensors. The invention further provides a method for controlling motor power. The method comprises the following steps: obtaining the current temperature T of the motor by utilizing the method for monitoring motor temperature; judging temperature range of the current temperature T of the motor according to the current temperature T of the motor and a predetermined motor temperature range threshold; and setting the maximum output power of the motor according to the temperature range of the current temperature T of the motor. By utilizing the method for monitoring the motor temperature and the method for controlling the motor power, the current temperature of the motor can be effectively and reliably obtained, and reliably and maintenance-free performance of the motor can be improved.
Description
Technical field
The present invention relates to automobile dynamic system, relate in particular to motor temperature monitoring method and system and the power of motor control method and the system of pure electric vehicle.
Background technology
At present, people's pay attention to day by day is to the protection of environment and the use effectively and reasonably of the energy.Electric drive system can be realized low energy consumption and zero-emission, and therefore, pure electric automobiles efficient, energy-saving and environmental protection become one of automobile industry development trend, have market outlook.
In electric vehicle system, motor driven systems is subjected to the restriction of electric motor car installing space, to the requirement harshness of its volume size.And therefore remarkable advantages such as that the sine wave permanent magnet synchronous motor has is reliable, volume is little, light weight, loss is few, efficient is high and shape and size are versatile and flexible are widely adopted in the pure electric automobile drive system.It can not only drive car load, and can reclaim battery charge by braking energy, has effectively improved capacity usage ratio, thus the purpose that realization cuts down the consumption of energy.Yet,, guarantee that machine operation is in the temperature range that allows because permagnetic synchronous motor must be monitored motor temperature in real time, and diagnose according to the temperature that collects the sensitivity characteristic of temperature in the machine operation process.Yet traditional motor temperature monitoring method is fairly simple, and it adopts a temperature sensor to obtain motor temperature, and does not judge whether the detection data of temperature sensor are normal, thereby causes system reliability and non-maintaining property all lower.In addition; just power of motor is simply limited in traditional power of motor control according to the motor temperature that is obtained; for example when motor temperature surpasses a certain threshold value; directly the motor peak power output is restricted to zero or peak power 50% etc.; adopt this Poewr control method; its reality power bracket that motor-car uses of can powering is less; and because when motor temperature surpasses setting; directly power of motor is restricted to the particular percentile of setting power or peak power; thereby make the variation of power level and smooth inadequately; make motor its actual exportable peak power in some temperature range therefore can not in the protection motor, guarantee its exportable bigger power greater than this setting power.
Summary of the invention
In order to address the above problem, the invention provides a kind of motor temperature monitoring method, it can obtain the motor Current Temperatures effectively reliably.
In order to address the above problem, the present invention also provides a kind of power of motor control method, it can set the motor peak power output smoothly according to the motor Current Temperatures, thereby has improved the reliability and the non-maintaining property of electric system, and makes motor exportable bigger power in trouble free service.
In order to address the above problem, the present invention also provides a kind of motor temperature monitoring system, and it can obtain the motor Current Temperatures effectively reliably.
In order to address the above problem, the present invention also provides a kind of power of motor control system, and it can control power of motor smoothly, has improved the reliability and the non-maintaining property of electric system.
For this reason, the invention provides a kind of motor temperature monitoring method, it comprises the steps: 1) temperature sensor that n is used to detect motor Current Temperatures T, wherein n 〉=2 are set; 2) read the detection data of a described n temperature sensor; 3) based on the detection data of the temperature sensor of operate as normal in the described n temperature sensor and obtain described motor Current Temperatures T.
Wherein, described temperature sensor comprises: temperature sensor, thermopair, infrared temperature sensor.
Wherein, specifically comprise following content in the step 3): when the detection data of n temperature sensor all just often, obtain described motor Current Temperatures T based on the average of the detection data of n temperature sensor; When the detection data exception of m temperature sensor wherein, then the average based on the detection data of all the other n-m temperature sensor obtains described motor Current Temperatures T; When the detection data of n temperature sensor are all unusual, then judge n the equal fault of temperature sensor, and ignore the respective detection data.
The present invention also provides a kind of Poewr control method, and it comprises the steps: 10) adopt above-mentioned motor temperature monitoring method to obtain motor Current Temperatures T; 20) according to described motor Current Temperatures T and the predetermined interval threshold decision described motor Current Temperatures T of motor temperature temperature range of living in; 30) set the peak power output of motor according to the residing temperature range of described motor Current Temperatures T.
Wherein, described motor temperature interval comprises: operate as normal interval, this interval maximum temperature are motor temperature warning initial temperature T1; Power limited interval, this interval temperature greater than motor temperature warning initial temperature T1 less than motor temperature excess temperature fault initial temperature T2; The interval that quits work, this interval minimum temperature is motor temperature excess temperature fault initial temperature T2.
Wherein, in step 30) in specifically comprise following content: when described motor Current Temperatures T is in operate as normal when interval, the motor peak power output is set at peak power; When described motor Current Temperatures T is in the power limited interval, the motor peak power output is set at (T2-T)/(T2-T1) of peak power; When described motor Current Temperatures T is in when quitting work the interval, the motor output power is set at zero.
In addition, the present invention also provides a kind of motor temperature monitoring system, and it comprises: n temperature sensor is used to detect the data relevant with motor temperature, wherein n 〉=2; Diagnosis unit is used to judge whether described n the data relevant with motor temperature that temperature sensor obtained are normal; The motor temperature acquiring unit is used for based on the detection data of the temperature sensor of described n temperature sensor operate as normal and obtains described motor Current Temperatures T.
Wherein, described temperature sensor comprises: temperature sensor, thermopair, infrared temperature sensor.
Wherein, when the detection data of n temperature sensor all just often, obtain described motor Current Temperatures T based on the average of the detection data of n temperature sensor; When the detection data exception of m temperature sensor wherein, then the average based on the detection data of all the other n-m temperature sensor obtains described motor Current Temperatures T; When the detection data of n temperature sensor are all unusual, then judge n the equal fault of temperature sensor, and ignore the respective detection data.
In addition, the present invention also provides a kind of power of motor control system, and it comprises: above-mentioned motor temperature monitoring system is used to obtain motor Current Temperatures T; The power of motor control module is used for according to described motor Current Temperatures T and the predetermined interval threshold decision described motor Current Temperatures T of motor temperature temperature range of living in, and sets the peak power output of motor according to described judged result.
Wherein, described motor temperature interval comprises: operate as normal interval, this interval maximum temperature are motor temperature warning initial temperature T1; Power limited interval, this interval temperature greater than motor temperature warning initial temperature T1 less than motor temperature excess temperature fault initial temperature T2; The interval that quits work, this interval minimum temperature is motor temperature excess temperature fault initial temperature T2.
Wherein, when described motor Current Temperatures T is in the operate as normal interval, the motor peak power output is set at peak power; When described motor Current Temperatures T is in the power limited interval, the motor peak power output is set at (T2-T)/(T2-T1) of peak power; When described motor Current Temperatures T is in when quitting work the interval, the motor output power is set at zero.
Adopt motor temperature monitoring method of the present invention and system and Poewr control method and system to have following beneficial effect:
Motor temperature monitoring method of the present invention and system, owing to adopted Redundancy Design, promptly, obtain motor Current Temperatures T based on n temperature sensor, and by the detection data of n temperature sensor being diagnosed the temperature sensor of determining to detect normally data and operate as normal, thereby improved the reliability that motor temperature is gathered, and because it adopts the average of normal detection data to obtain motor Current Temperatures T, thereby higher accuracy and reliability had.
In addition, power of motor control method of the present invention and system, owing to adopted motor temperature monitoring method provided by the invention and system, thereby can effectively reliably obtain motor Current Temperatures T accurately, and can be according to described motor Current Temperatures T temperature range of living in, the motor peak power output is set at zero, (T2-T)/(T2-T1) of peak power or peak power, the motor peak power output is linear in the peak power of a certain temperature range and motor, this power control is comparatively level and smooth, thereby improved the reliability and the non-maintaining property of electric system, and made motor exportable bigger power in trouble free service.
Description of drawings
Fig. 1 is the process flow diagram of motor temperature monitoring method provided by the invention;
Fig. 2 is a process flow diagram of gathering the detection data relevant with motor temperature among the present invention;
Fig. 3 is the process flow diagram of power of motor control method provided by the invention;
Fig. 4 is a detail flowchart of controlling power of motor among the present invention according to motor Current Temperatures T;
Fig. 5 is the structured flowchart of motor temperature monitoring system provided by the invention;
Fig. 6 is the structured flowchart of power of motor control system provided by the invention.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, motor temperature monitoring method provided by the invention and system and power of motor control method and system are described in detail below in conjunction with accompanying drawing.
As shown in Figure 1, be the process flow diagram of motor temperature monitoring method of the present invention.In step S1, n the temperature sensor that is used to detect motor Current Temperatures T, wherein n 〉=2 are set; In step S2, read the detection data of a described n temperature sensor; In step S3, based on the detection data of the temperature sensor of operate as normal in the described n temperature sensor and obtain described motor Current Temperatures T, wherein said temperature sensor comprises: temperature sensor, thermopair, infrared temperature sensor.
Wherein, owing to the detection data based on the temperature sensor of operate as normal in the described n temperature sensor in step S3 obtain described motor Current Temperatures T, so it is need judge the detection data of sensor determine whether it is normal, if undesired then do not adopt.In actual applications, can detect the pairing temperature of data whether in the measurement temperature range of this sensor or whether judge in motor temperature actual working environment temperature normals whether described detection data are normal according to temperature sensor.Be that the detailed process of the detection data relevant with motor temperature is gathered in the example explanation with 2 temperature sensors below.
As shown in Figure 2, in step S20, at first gather the detection data t of two temperature sensors that are connected with motor, collect the detection data of two temperature sensors at step S20 after, step goes to S21 and S22, judges respectively whether the detection data t2 of the detection data t1 of temperature sensor 1 and temperature sensor 2 is normal.When the normal and detection data t2 of temperature sensor 2 of the detection data t1 of temperature sensor 1 is undesired, then adopt the detection data t1 of temperature sensor 1 to obtain motor Current Temperatures T; The detection data t2 of and temperature sensor 2 undesired as the detection data t1 of temperature sensor 1 just often then adopts the detection data t2 of temperature sensor 2 to obtain motor Current Temperatures T; When the detection data t2 of the detection data t1 of temperature sensor 1 and temperature sensor 2 all just often, then adopt the average (t1+t2)/2 of the detection data t2 of the detection data t1 of temperature sensor 1 and temperature sensor 2 to obtain motor Current Temperatures T; When the detection data t2 of the detection data t1 of temperature sensor 1 and temperature sensor 2 is all undesired, then judges two equal faults of temperature sensor, and ignore and detect data t1 and t2.
When the temperature sensor quantity that is provided with is n, then can adopt similarly and judge, and, when the detection data of n temperature sensor all just often, obtain described motor Current Temperatures T based on the average of the detection data of n temperature sensor; When the detection data exception of m temperature sensor wherein, then the average based on the detection data of all the other n-m temperature sensor obtains described motor Current Temperatures T; When the detection data of n temperature sensor are all unusual, then judge n the equal fault of temperature sensor, and ignore the respective detection data.
In actual applications, can obtain the corresponding relation of motor temperature and power of motor according to experimental data, so after obtaining motor Current Temperatures T, can judge whether it is the working temperature that motor can bear, if not, can reduce motor temperature by the restriction power of motor according to the corresponding relation of motor temperature and power of motor, make machine operation in its temperature range that can bear.
As shown in Figure 3, be the process flow diagram of power of motor control method of the present invention.As shown in the figure, at first in step S 100, adopt above-mentioned motor temperature monitoring method provided by the invention to obtain motor Current Temperatures T.In step S200, reach the interval threshold decision motor Current Temperatures T of predetermined motor temperature temperature range of living in then according to motor Current Temperatures T, wherein, the motor temperature interval comprises: operate as normal interval, this interval maximum temperature are motor temperature warning initial temperature T1; Power limited interval, this interval temperature greater than motor temperature warning initial temperature T1 less than motor temperature excess temperature fault initial temperature T2; The interval that quits work, this interval minimum temperature is motor temperature excess temperature fault initial temperature T2.Then go to step S300, set the peak power output of motor according to the residing temperature range of motor Current Temperatures T.
Describe how to control power of motor in detail below in conjunction with Fig. 4 according to motor Current Temperatures T.
As shown in Figure 4, after step S100 collected motor Current Temperatures T, step went to S200 and S210, judged that respectively whether motor temperature T is greater than T1 and T2.As motor temperature T during less than T1, step goes to S300, the peak power output of motor is made as the peak power of motor; When T greater than T1 during less than T2, step goes to S310, the peak power output of motor is restricted to (T2-T)/(T2-T1) of peak power; As motor temperature T during greater than T2, step goes to S320, and the motor output power is set at zero.Wherein, when in step S200, judging T, then needn't carry out step S21 again and judge that whether T is greater than T2 less than T1.
In addition, the present invention also provides a kind of motor temperature monitoring system, and as shown in Figure 5, this system comprises n temperature sensor, diagnosis unit 2 and motor temperature acquiring unit 3.N temperature sensor is connected with motor, is used to obtain the detection data relevant with motor temperature, and the detection data of being obtained are sent to diagnosis unit 2.Diagnosis unit 2 obtains the detection data of n temperature sensor, and judges whether described detection data are normal.Motor temperature acquiring unit 3 is based on the detection data of the temperature sensor of operate as normal in n the temperature sensor and obtain described motor Current Temperatures T, wherein, when the detection data of n temperature sensor all just often, obtain described motor Current Temperatures T based on the average of the detection data of n temperature sensor; When the detection data exception of m temperature sensor wherein, then the average based on the detection data of all the other n-m temperature sensor obtains described motor Current Temperatures T; When the detection data of n temperature sensor are all unusual, then judge n the equal fault of temperature sensor, and ignore the respective detection data.
Wherein, described temperature sensor comprises: temperature sensor, thermopair, infrared temperature sensor.
In addition, the present invention also provides a kind of power of motor control system, as shown in Figure 6, comprises above-mentioned motor temperature monitoring system 10 provided by the invention, is used to obtain motor Current Temperatures T and is sent to power of motor control module 20; Power of motor control module 20 is used to judge motor Current Temperatures T temperature range of living in and sets the motor peak power output according to judged result.Wherein, described motor temperature interval comprises: operate as normal interval, this interval maximum temperature are motor temperature warning initial temperature T1; Power limited interval, this interval temperature greater than motor temperature warning initial temperature T1 less than motor temperature excess temperature fault initial temperature T2; The interval that quits work, this interval minimum temperature is motor temperature excess temperature fault initial temperature T2.When described motor Current Temperatures T is in the operate as normal interval, the motor peak power output is set at peak power; When described motor Current Temperatures T is in the power limited interval, the motor peak power output is set at (T2-T)/(T2-T1) of peak power; When described motor Current Temperatures T is in when quitting work the interval, the motor output power is set at zero.
Be understandable that above embodiment only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement also are considered as protection scope of the present invention.
Claims (10)
1. a motor temperature monitoring method is characterized in that comprising the steps:
1) n the temperature sensor that is used to detect motor Current Temperatures T, wherein n 〉=2 are set;
2) read the detection data of a described n temperature sensor;
3) based on the detection data of the temperature sensor of operate as normal in the described n temperature sensor and obtain described motor Current Temperatures T.
2. motor temperature monitoring method as claimed in claim 1 is characterized in that specifically comprising following content in described step 3):
When the detection data of n temperature sensor all just often, obtain described motor Current Temperatures T based on the average of the detection data of n temperature sensor;
When the detection data exception of m temperature sensor wherein, then the average based on the detection data of all the other n-m temperature sensor obtains described motor Current Temperatures T;
When the detection data of n temperature sensor are all unusual, then judge n the equal fault of temperature sensor, and ignore the respective detection data.
3. a power of motor control method is characterized in that comprising the steps:
10) employing obtains motor Current Temperatures T as any described motor temperature monitoring method of claim 1-2;
20) according to described motor Current Temperatures T and the predetermined interval threshold decision described motor Current Temperatures T of motor temperature temperature range of living in;
30) set the peak power output of motor according to the residing temperature range of described motor Current Temperatures T.
4. power of motor control method as claimed in claim 3 is characterized in that described motor temperature interval comprises:
Operate as normal interval, this interval maximum temperature are motor temperature warning initial temperature T1;
Power limited interval, this interval temperature greater than motor temperature warning initial temperature T1 less than motor temperature excess temperature fault initial temperature T2; And
The interval that quits work, this interval minimum temperature is motor temperature excess temperature fault initial temperature T2.
5. as claim 3 or 4 described power of motor control methods, it is characterized in that in step 30) in specifically comprise following content:
When described motor Current Temperatures T is in the operate as normal interval, the motor peak power output is set at peak power;
When described motor Current Temperatures T is in the power limited interval, the motor peak power output is set at (T2-T)/(T2-T1) of peak power;
When described motor Current Temperatures T is in when quitting work the interval, the motor output power is set at zero.
6. motor temperature monitoring system is characterized in that comprising:
N temperature sensor is used to detect the data relevant with motor temperature, wherein n 〉=2;
Diagnosis unit is used to judge whether described n the data relevant with motor temperature that temperature sensor obtained are normal;
The motor temperature acquiring unit is used for based on the detection data of the temperature sensor of described n temperature sensor operate as normal and obtains described motor Current Temperatures T.
7. motor temperature monitoring system as claimed in claim 6 is characterized in that:
When the detection data of n temperature sensor all just often, then the average based on the detection data of n temperature sensor obtains described motor Current Temperatures T;
When the detection data exception of m temperature sensor wherein, then determine described motor Current Temperatures T based on the average of the detection data of all the other n-m temperature sensor;
When the detection data of n temperature sensor are all unusual, then judge n the equal fault of temperature sensor.
8. power of motor control system is characterized in that comprising:
As claim 6 or 7 described motor temperature monitoring systems, be used to obtain motor Current Temperatures T;
The power of motor control module is used for according to described motor Current Temperatures T and the predetermined interval threshold decision described motor Current Temperatures T of motor temperature temperature range of living in, and sets the peak power output of motor according to described judged result.
9. power of motor control system as claimed in claim 8 is characterized in that described motor temperature interval comprises:
Operate as normal interval, this interval maximum temperature are motor temperature warning initial temperature T1;
Power limited interval, this interval temperature greater than motor temperature warning initial temperature T1 less than motor temperature excess temperature fault initial temperature T2; And
The interval that quits work, this interval minimum temperature is motor temperature excess temperature fault initial temperature T2.
10. power of motor control system as claimed in claim 9 is characterized in that: described power of motor control module is carried out following operation:
Judge described motor Current Temperatures T when it and be in operate as normal when interval, the motor peak power output is set at peak power;
Judge described motor Current Temperatures T when it and be in power limited when interval, the motor peak power output is set at (T2-T)/(T2-T1) of peak power;
Judge described motor Current Temperatures T when it and be in when quitting work the interval, the motor output power is set at zero.
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| CN2010106013967A CN102135453A (en) | 2010-12-10 | 2010-12-10 | Method and system for monitoring motor temperature as well as method and system for controlling motor power |
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