CN112009234B - Self-adaptive control method for cooling electronic fan of pure electric bus driving system - Google Patents
Self-adaptive control method for cooling electronic fan of pure electric bus driving system Download PDFInfo
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- CN112009234B CN112009234B CN202010954880.1A CN202010954880A CN112009234B CN 112009234 B CN112009234 B CN 112009234B CN 202010954880 A CN202010954880 A CN 202010954880A CN 112009234 B CN112009234 B CN 112009234B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K11/00—Arrangement in connection with cooling of propulsion units
- B60K11/06—Arrangement in connection with cooling of propulsion units with air cooling
Abstract
The invention discloses a self-adaptive control method for a cooling electronic fan of a pure electric bus driving system, which specifically comprises the following steps: (1) when the key signal =1, the cooling system is in the power-down mode; (2) when the key signal =2, the cooling system enters the wake-up mode; (3) the key signal > =3, the electronic fan firstly performs self-checking, and the electronic fan enters a waiting mode after the self-checking is finished; (4) after entering the waiting mode, the water pump and the fan do not work, and only when the control temperature of the motor or the motor is higher than a set threshold, the water pump can intervene in the work in advance until the temperature of the motor and the motor controller is lower than the set threshold, and then the work is stopped; (5) when the whole vehicle is detected to enter a driving mode, the water pump is enabled, the electronic fan enters an operating mode, and the electronic fan PWM = max (PWM 1 and PWM 2). The method is simple to control, low in cost and easy to realize, is suitable for the pure electric bus driving system to cool the electronic fan, and can effectively avoid excessive energy consumption of the cooling system.
Description
Technical Field
The invention relates to the technical field of new energy vehicle thermal management, in particular to a self-adaptive control method for a cooling electronic fan of a pure electric bus driving system.
Background
With the increasingly outstanding environmental and energy problems, energy-saving and environment-friendly pure electric buses are increasingly accepted by people in the field of urban public transportation. The driving motor is a power source of a pure electric bus, and the performance of the driving motor directly influences the running safety and quality of the vehicle. When a vehicle starts, accelerates and runs at a high speed, the internal consumption of the motor controller and the motor is increased rapidly under the condition that the motor works under a large current, a large amount of heat is released, and if the heat is not cooled effectively, the internal temperature of the motor controller and the motor is increased rapidly, so that the output power, the efficiency and the service life of the driving motor are influenced, and the normal work of a driving system is seriously hindered.
The electronic fan of the pure electric drive system is generally controlled in three gears: and the low gear, the medium gear and the high gear start different gears according to the temperature value of the part. However, since the electronic fan has a small number of stages, excessive power consumption may occur in the middle or high speed stage. At present, some manufacturers adopt PWM to control an electronic fan to work in a cooling system device, and stepless speed regulation is realized through PWM self-adaptive regulation so as to meet the heat dissipation requirement and reduce energy consumption. However, it is obvious that the existing pure electric passenger car with the electronic fan controlled by PWM cannot effectively avoid the excessive energy consumption of the cooling system. Therefore, the self-adaptive control method for the cooling electronic fan of the pure electric bus driving system is provided.
Disclosure of Invention
The invention provides a self-adaptive control method for a cooling electronic fan of a pure electric bus driving system, which aims to overcome the defect that excessive energy consumption of the cooling system cannot be effectively avoided in the pure electric bus by adopting a PWM (pulse width modulation) electronic fan control mode in the prior art.
The invention adopts the following technical scheme:
a self-adaptive control method for a cooling electronic fan of a pure electric bus driving system is characterized by comprising the following steps:
(1) detecting a key signal, and when the key signal =1, namely the whole vehicle is in an OFF gear, the cooling system is in a power-down mode, the electronic fan PWM =0, the water pump is not enabled, and the Pumpenable = 0;
(2) if the key signal =2, namely the whole vehicle is in an ACC gear, the cooling system enters an awakening mode, the electronic fan PWM =0, and the Pumpenable = 0;
(3) if the key signal is larger than or equal to 3, namely the whole vehicle is in an ON gear or a START gear, the cooling system enters a self-checking mode, the electronic fan carries out self-checking according to the calibrated self-checking time t and the self-checking rotating speed PWM _ CHECK, and the electronic fan enters a waiting mode after the self-checking is finished;
(4) when the electronic fan enters a waiting mode but does not enter a driving mode, the water pump and the fan do not work, the electronic fan PWM =0, and the Pumpenable = 0; if the motor temperature T1> Ts1 or the motor control temperature T2> Ts2, the water pump is operated in advance, namely Pumpenable =1, and is not stopped until the motor temperature T1 is less than To1 and T2 is less than To2, the Ts1 and the Ts2 are respectively a motor temperature threshold value for the water pump To be operated in advance and a motor controller temperature threshold value for the water pump To be operated in advance, and the To1 and the To2 are respectively a motor temperature threshold value for the water pump To be stopped and a motor controller temperature threshold value for the water pump To be stopped;
(5) whether the whole vehicle enters a driving state or not is detected, if yes, the cooling system enters a working mode, the water pump enables Pumpenable =1, and the electronic fan PWM = max (PWM 1, PWM2), wherein: the PWM1 is a duty ratio obtained by self-adaptive adjustment of the motor temperature change, and the PWM2 is a duty ratio obtained by self-adaptive adjustment of the motor controller temperature change.
Preferably, the PWM1 adaptive control method includes the following steps: s11, when the motor temperature T1 is detected to be larger than the lower limit value Tmin1 of the motor working temperature, the PWM1 enters a circulation mode, the PWM1= PWM _ LOW, and the PWM _ LOW is the lowest rotating speed duty ratio of the electronic fan; s12, when the motor temperature T1 is greater than Tmin1 and less than the motor optimum operating temperature Tb1, if T1 is in a falling or constant state, then the PWM1 is decreased at the speed of decreasing period T2 and decreasing amount P2, otherwise the PWM1 is increased at the speed of period T1 and increasing amount P1; s13, when the motor temperature T1 is greater than Tb1 and less than the motor working temperature upper limit value Tmax1, if T1 is in a rising or constant state, the PWM1 rises at the speed of a period T1 and an increment amount P1, otherwise the PWM1 falls at the speed of a period T2 and a decrement amount P2; s14, when the motor temperature T1 is equal to the optimal motor working temperature Tb1, the PWM1 maintains the current value unchanged; s15, when the motor temperature T1 is larger than the motor working temperature upper limit value Tmax1, PWM1= PWM _ HIGH, and the PWM _ HIGH is the maximum rotating speed duty ratio of the electronic fan; and S16, when the motor temperature T1 is detected to be smaller than the motor working temperature lower limit value Tmin1, the PWM1 exits the circulation mode, and the PWM1= 0.
Preferably, the PWM2 adaptive control method includes the following steps: s21, when the motor controller temperature T2 is detected to be larger than the motor controller working temperature lower limit value Tmin2, the PWM2 enters a circulation mode, and PWM2= PWM _ LOW; s22, when the motor controller temperature T2 is greater than Tmin2 and less than the motor controller optimum operating temperature Tb2, if T2 is in a falling or constant state, then PWM2 is decreased at the rate of decreasing period T2 and decreasing amount P2, otherwise PWM2 is increased at the rate of period T1 and increasing amount P1; s23, when the motor controller temperature T2 is larger than the motor controller optimal working temperature Tb2 and smaller than the motor controller working temperature upper limit value Tmax2, if T2 is in a rising or constant state, the PWM2 is increased at the speed of a period T1 and an increment amount P1, otherwise the PWM2 is decreased at the speed of a period T2 and a decrement amount P2; s24, when the temperature T2 of the motor controller is equal to the optimal working temperature Tb2, the PWM2 maintains the current value unchanged; s25, when the motor controller temperature T2 is larger than the motor controller working temperature upper limit value Tmax2, PWM2= PWM _ HIGH; s26, when the motor controller temperature T2 is less than Tmin2, PWM2 exits the cycling mode, PWM2= 0.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages:
1. the invention receives the temperature of the driving motor, the temperature of the motor controller, the key signal and the running state signal of the whole vehicle, and carries out self-adaptive control on the electronic fan of the cooling system according to the real-time temperature change of the driving motor and the motor controller and the state of the whole vehicle, and the working mode of the cooling system is divided into a power-down mode, an awakening mode, a waiting mode, a working mode and a circulating mode. The method is simple to control, low in cost and suitable for controlling the electronic cooling fan of the pure electric bus driving system, and can effectively avoid excessive energy consumption of the cooling system.
2. The cooling system receives the motor temperature value T1 and the motor controller temperature value T2 in real time, enters a circulation mode when T1 and T2 meet a set temperature threshold value, adopts a robust algorithm to adaptively calculate a PWM output value so as to control the rotating speed of an electronic fan to meet the heat dissipation requirement of a driving system, and is simple to control and easy to realize.
Drawings
FIG. 1 is a control flow chart of the present invention.
Fig. 2 is a flow chart of the adaptive PWM1 control according to the present invention.
Fig. 3 is a flow chart of the adaptive PWM2 control according to the present invention.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings. Numerous details are set forth below in order to provide a thorough understanding of the present invention, but it will be apparent to those skilled in the art that the present invention may be practiced without these details. Well-known components, methods and processes are not described in detail below.
The invention provides a self-adaptive control method for a cooling electronic fan of a pure electric bus driving system, wherein the cooling system of the pure electric bus comprises the following steps: expansion tank, cooling pipeline, water pump, radiator, electronic fan, electrical system etc. adopt motor and the integrative cooling mode of motor controller, give motor and motor controller heat dissipation promptly simultaneously, cooling system receives driving motor temperature T1 in real time, motor controller temperature T2, key signal (1 is OFF gear, 2 is the ACC gear, 3 is the ON gear, 4 is the START gear), can signals such as whole car travel state.
The following PWM is the control duty ratio of the electronic fan output by the cooling system, PWM1 is the duty ratio obtained by self-adaptive adjustment and calculation aiming at the temperature change of the motor, and PWM2 is the duty ratio obtained by self-adaptive adjustment and calculation aiming at the temperature change of a motor controller; ts1 and Ts2 are respectively a temperature threshold of a water pump working in advance in a waiting mode and a temperature threshold of a motor controller; the temperature thresholds of the motor and the motor controller for the water pump To stop being intervened in advance in the To1 and To2 waiting modes; tmin1, Tmax1 and Tb1 are respectively a lower limit value, an upper limit value and an optimal working temperature value of the calibrated motor working temperature; tmin2, Tmax2 and Tb2 are the lower limit value, the upper limit value and the optimal working temperature value of the calibrated working temperature of the motor controller; PWM _ lOW, PWM _ HIGH, P1, P2, t1 and t2 are respectively the calibrated lowest rotation speed duty ratio of the electronic fan, the highest rotation speed control duty ratio of the electronic fan, increment, decrement, increment period and decrement period.
Referring to fig. 1, the method comprises the following specific steps:
(1) detecting a key signal, and when the key signal =1, the cooling system is in a power-down mode, the electronic fan PWM =0, the water pump is not enabled, and the Pumpenable = 0;
(2) if the key signal =2, the cooling system enters the wake-up mode, the electronic fan PWM =0, and the Pumpenable = 0;
(3) if the key signal is larger than or equal to 3, the cooling system enters a self-checking mode, the electronic fan carries out self-checking according to the calibrated self-checking time t and the self-checking rotating speed PWM _ CHECK, and the electronic fan enters a waiting mode after the self-checking is finished;
(4) when the motor enters the waiting mode but does not enter the driving mode, the water pump and the fan do not work normally, the electronic fan PWM =0 and the Pumpenable =0, if the motor temperature T1> Ts1 or the motor control temperature T2> Ts2, the water pump can intervene in the work in advance (namely Pumpenable = 1) until the motor temperature T1< To1 and T2< To2 stop working;
(5) whether the whole vehicle enters a driving state or not is detected, if yes, the cooling system enters a working mode, the water pump enables Pumpenable =1, and the electronic fan PWM = max (PWM 1, PWM2), namely: the electronic fan PWM takes the larger of PWM1 and PWM 2.
Referring to fig. 2, the PWM1 adaptive control method includes the following steps: s11, when the motor temperature T1 is detected to be larger than the lower limit value Tmin1 of the motor working temperature, the PWM1 enters a circulation mode, the PWM1= PWM _ LOW, and the PWM _ LOW is the lowest rotating speed duty ratio of the electronic fan; s12, when the motor temperature T1 is greater than Tmin1 and less than the motor optimum operating temperature Tb1, if T1 is in a falling or constant state, then the PWM1 is decreased at the speed of decreasing period T2 and decreasing amount P2, otherwise the PWM1 is increased at the speed of period T1 and increasing amount P1; s13, when the motor temperature T1 is greater than Tb1 and less than the motor working temperature upper limit value Tmax1, if T1 is in a rising or constant state, the PWM1 rises at the speed of a period T1 and an increment amount P1, otherwise the PWM1 falls at the speed of a period T2 and a decrement amount P2; s14, when the motor temperature T1 is equal to the optimal motor working temperature Tb1, the PWM1 maintains the current value unchanged; s15, when the motor temperature T1 is larger than the motor working temperature upper limit value Tmax1, PWM1= PWM _ HIGH, and the PWM _ HIGH is the maximum rotating speed duty ratio of the electronic fan; and S16, when the motor temperature T1 is detected to be smaller than the motor working temperature lower limit value Tmin1, the PWM1 exits the circulation mode, and the PWM1= 0.
Referring to fig. 3, the PWM2 adaptive control method includes the steps of: s21, when the motor controller temperature T2 is detected to be larger than the motor controller working temperature lower limit value Tmin2, the PWM2 enters a circulation mode, and PWM2= PWM _ LOW; s22, when the motor controller temperature T2 is greater than Tmin2 and less than the motor controller optimum operating temperature Tb2, if T2 is in a falling or constant state, then PWM2 is decreased at the rate of decreasing period T2 and decreasing amount P2, otherwise PWM2 is increased at the rate of period T1 and increasing amount P1; s23, when the motor controller temperature T2 is larger than the motor controller optimal working temperature Tb2 and smaller than the motor controller working temperature upper limit value Tmax2, if T2 is in a rising or constant state, the PWM2 is increased at the speed of a period T1 and an increment amount P1, otherwise the PWM2 is decreased at the speed of a period T2 and a decrement amount P2; s24, when the temperature T2 of the motor controller is equal to the optimal working temperature Tb2, the PWM2 maintains the current value unchanged; s25, when the motor controller temperature T2 is larger than the motor controller working temperature upper limit value Tmax2, PWM2= PWM _ HIGH; s26, when the motor controller temperature T2 is less than Tmin2, PWM2 exits the cycling mode, PWM2= 0.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (2)
1. A self-adaptive control method for a cooling electronic fan of a pure electric bus driving system is characterized by comprising the following steps:
(1) detecting a key signal, and when the key signal =1, namely the whole vehicle is in an OFF gear, the cooling system is in a power-down mode, the electronic fan PWM =0, the water pump is not enabled, and the Pumpenable = 0;
(2) if the key signal =2, namely the whole vehicle is in an ACC gear, the cooling system enters an awakening mode, the electronic fan PWM =0, and the Pumpenable = 0;
(3) if the key signal is larger than or equal to 3, namely the whole vehicle is in an ON gear or a START gear, the cooling system enters a self-checking mode, the electronic fan carries out self-checking according to the calibrated self-checking time t and the self-checking rotating speed PWM _ CHECK, and the electronic fan enters a waiting mode after the self-checking is finished;
(4) when the electronic fan enters a waiting mode but does not enter a driving mode, the water pump and the fan do not work, the electronic fan PWM =0, and the Pumpenable = 0; if the motor temperature T1> Ts1 or the motor control temperature T2> Ts2, the water pump is operated in advance, namely Pumpenable =1, and is not stopped until the motor temperature T1 is less than To1 and T2 is less than To2, the Ts1 and the Ts2 are respectively a motor temperature threshold value for the water pump To be operated in advance and a motor controller temperature threshold value for the water pump To be operated in advance, and the To1 and the To2 are respectively a motor temperature threshold value for the water pump To be stopped and a motor controller temperature threshold value for the water pump To be stopped;
(5) whether the whole vehicle enters a driving state or not is detected, if yes, the cooling system enters a working mode, the water pump enables Pumpenable =1, and the electronic fan PWM = max (PWM 1, PWM2), wherein: the PWM1 is the duty ratio obtained by self-adaptive adjustment and calculation aiming at the temperature change of the motor, and the PWM2 is the duty ratio obtained by self-adaptive adjustment and calculation aiming at the temperature change of the motor controller;
the PWM1 self-adaptive control method comprises the following steps:
s11, when the motor temperature T1 is detected to be larger than the lower limit value Tmin1 of the motor working temperature, the PWM1 enters a circulation mode, the PWM1= PWM _ LOW, and the PWM _ LOW is the lowest rotating speed duty ratio of the electronic fan;
s12, when the motor temperature T1 is greater than Tmin1 and less than the motor optimum operating temperature Tb1, if T1 is in a falling or constant state, then the PWM1 is decreased at the speed of decreasing period T2 and decreasing amount P2, otherwise the PWM1 is increased at the speed of period T1 and increasing amount P1;
s13, when the motor temperature T1 is greater than Tb1 and less than the motor working temperature upper limit value Tmax1, if T1 is in a rising or constant state, the PWM1 rises at the speed of a period T1 and an increment amount P1, otherwise the PWM1 falls at the speed of a period T2 and a decrement amount P2;
s14, when the motor temperature T1 is equal to the optimal motor working temperature Tb1, the PWM1 maintains the current value unchanged;
s15, when the motor temperature T1 is larger than the motor working temperature upper limit value Tmax1, PWM1= PWM _ HIGH, and the PWM _ HIGH is the maximum rotating speed duty ratio of the electronic fan;
and S16, when the motor temperature T1 is detected to be smaller than the motor working temperature lower limit value Tmin1, the PWM1 exits the circulation mode, and the PWM1= 0.
2. The adaptive control method for the cooling electronic fan of the pure electric bus driving system as claimed in claim 1, wherein the adaptive control method for PWM2 comprises the following steps:
s21, when the motor controller temperature T2 is detected to be larger than the motor controller working temperature lower limit value Tmin2, the PWM2 enters a circulation mode, and PWM2= PWM _ LOW;
s22, when the motor controller temperature T2 is greater than Tmin2 and less than the motor controller optimum operating temperature Tb2, if T2 is in a falling or constant state, then PWM2 is decreased at the rate of decreasing period T2 and decreasing amount P2, otherwise PWM2 is increased at the rate of period T1 and increasing amount P1;
s23, when the motor controller temperature T2 is larger than the motor controller optimal working temperature Tb2 and smaller than the motor controller working temperature upper limit value Tmax2, if T2 is in a rising or constant state, the PWM2 is increased at the speed of a period T1 and an increment amount P1, otherwise the PWM2 is decreased at the speed of a period T2 and a decrement amount P2;
s24, when the temperature T2 of the motor controller is equal to the optimal working temperature Tb2, the PWM2 maintains the current value unchanged;
s25, when the motor controller temperature T2 is larger than the motor controller working temperature upper limit value Tmax2, PWM2= PWM _ HIGH;
s26, when the motor controller temperature T2 is less than Tmin2, PWM2 exits the cycling mode, PWM2= 0.
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| KR20110081622A (en) * | 2010-01-08 | 2011-07-14 | (주)브이이엔에스 | Electric vehicle and method for cooling battery thereof |
| CN104808719B (en) * | 2015-03-12 | 2017-09-22 | 北京长安汽车工程技术研究有限责任公司 | A kind of temperature control system and method |
| CN106953138B (en) * | 2017-05-11 | 2019-04-05 | 厦门金龙联合汽车工业有限公司 | A kind of power battery water chiller system and its temperature difference intelligent control method |
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| CN110920378A (en) * | 2018-09-20 | 2020-03-27 | 郑州宇通客车股份有限公司 | Intelligent thermal management control method for vehicle motor driving system |
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