A method and apparatus for controlling the rotational speed of a cooling fan of an internal combustion power pack

Abstract

The application discloses a cooling fan rotating speed control method and device for an internal combustion power pack, comprising the following steps: when T < T1, the rotating speed of the cooling fan for the internal combustion power pack is adjusted to V0; when T1 <= T < T2, the rotating speed of the cooling fan for the internal combustion power pack is adjusted to V1; when T2 <= T < T3, the rotating speed of the cooling fan for the internal combustion power pack is linearly adjusted according to the value of T; and when T >= T3, the rotating speed of the cooling fan for the internal combustion power pack is adjusted to V m Compared with the prior art, the application can reduce the noise caused by the cooling fan under the premise of guaranteeing the heat dissipation requirement of the power pack, and improve the experience of passengers when waiting for the train. Different rotating speeds of the cooling fan are set according to different temperature intervals, so that the energy consumption is reduced under the premise of guaranteeing the heat dissipation requirement of the power pack. The accelerating speed of the cooling fan is adaptively adjusted according to different temperature rising rates, so that the energy consumption is further reduced under the premise of guaranteeing the heat dissipation requirement of the power pack. Overheating protection is provided for the internal combustion power pack.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of rail transit, in particular to a cooling fan rotating speed control method and device for an internal combustion power pack. BACKGROUND

[0002] Currently, the power source of the existing internal combustion power rail transit vehicle is an internal combustion power pack, which is composed of a diesel engine, a generator, a cooling system and the like. The cooling system includes a cooling liquid radiator, a supercharged air radiator and a cooling fan.

[0003] The cooling fan in the existing internal combustion power pack has a relatively high rotating speed at the initial stage of starting, which produces a relatively large noise and affects the experience of passengers waiting for the vehicle. SUMMARY

[0004] The present application provides a cooling fan rotating speed control method and device for an internal combustion power pack to solve the problem of the existing internal combustion power pack, i.e., the cooling fan has a relatively high rotating speed at the initial stage of starting, which produces a relatively large noise and affects the experience of passengers waiting for the vehicle.

[0005] To achieve the above-mentioned purpose, the present application adopts the following technical solutions.

[0006] In one aspect, a cooling fan rotating speed control method for an internal combustion power pack is provided, which comprises:

[0007] When T < T1, the rotating speed of the cooling fan of the internal combustion power pack is adjusted to V0;

[0008] When T1≤T < T2, the rotating speed of the cooling fan of the internal combustion power pack is adjusted to V1;

[0009] When T2≤T < T3, the rotating speed of the cooling fan of the internal combustion power pack is linearly adjusted according to the value of T;

[0010] When T≥T3, the rotating speed of the cooling fan of the internal combustion power pack is adjusted to V m ;

[0011] Wherein, T is the measured value of the supercharged air temperature of the internal combustion power pack, T1 is the supercharged air temperature of the internal combustion power pack when the vehicle stops at a station, T3 is the highest intake air temperature of the diesel engine; V m is the rated rotating speed of the cooling fan, V1 is the preset rotating speed of the cooling fan when the vehicle stops at a station,

[0012] The inventor has found that in the existing power pack, the setting that the rotation speed of the cooling fan is not less than 1 / 3 of the rated rotation speed when the diesel engine is running at idle speed is based on the maximum heat dissipation requirement of the diesel engine when running at idle speed (i.e. when the rail vehicle stops at a station after running for a period of time), at which time the rail vehicle has been running for a period of time and the intake temperature of the diesel engine has already increased, so there is a certain amount of heat dissipation requirement. However, at the initial stage of starting of the rail vehicle, the intake temperature of the diesel engine is not high, and the cooling fan does not need such a high rotation speed to ensure its heat dissipation requirement.

[0013] Therefore, at the initial stage of starting of the rail vehicle, the temperature <T1 of the boost air of the internal combustion power pack is reduced by reducing the rotation speed of the cooling fan of the internal combustion power pack from V1 (the set rotation speed of the cooling fan of the existing internal combustion power pack) to V0, which reduces the noise caused by the cooling fan under the premise of ensuring the heat dissipation requirement of the power pack, thereby improving the experience of passengers when waiting for the vehicle. On the other hand, different rotation speeds of the cooling fan are set according to different temperature intervals, which further reduces the energy consumption under the premise of ensuring the heat dissipation requirement of the power pack.

[0014] In some embodiments, the rotation speed of the cooling fan of the internal combustion power pack is linearly adjusted according to the value of T:

[0015] If ΔT1≤ΔT≤ΔT2, the rotation speed of the cooling fan is linearly adjusted according to the first curve;

[0016] If ΔT<ΔT1, the rotation speed of the cooling fan is linearly adjusted according to the second curve;

[0017] If ΔT>ΔT2, the rotation speed of the cooling fan is linearly adjusted according to the third curve; wherein ΔT is the measured value of the temperature rise rate of the boost air of the internal combustion power pack, ΔT1 is the first temperature rise rate threshold, and ΔT2 is the second temperature rise rate threshold; the expression of the first curve is y=k1*x, the expression of the second curve is y=k2*x, and the expression of the third curve is y=k3*x, y is the rotation speed of the cooling fan, x is the temperature of the boost air of the internal combustion power pack, and k2<k1<k3.

[0018] Through the above adjustment strategy, when the temperature rise rate of the boost air is fast, the speed-up rate of the cooling fan is also increased synchronously, and when the temperature rise rate of the boost air is slow, the speed-up rate of the cooling fan is also decreased synchronously, thereby realizing precise control of the rotation speed of the cooling fan and further reducing the energy consumption under the premise of ensuring the heat dissipation requirement of the power pack.

[0019] In order to realize the overheat protection of the internal combustion power pack, in some embodiments, when T≥T3, if the demand power of the vehicle for the internal combustion power pack continues to increase, the rotation speed of the cooling fan is kept at V m , the rotation speed of the internal combustion power pack is adjusted to idle speed.

[0020] In another aspect, provided is a cooling fan rotating speed control device for an internal combustion power pack, which is applied to a cooling device on the internal combustion power pack, the internal combustion power pack comprising a diesel engine, the cooling device comprising a hydraulic pump, a hydraulic motor and a cooling fan, the hydraulic pump being in driving connection with the diesel engine, the hydraulic motor being driven by the hydraulic pump, the cooling fan being driven by the hydraulic motor; further comprising an electric regulating valve and a controller,

[0021] The electric regulating valve is used to adjust the pressure of hydraulic oil input into the hydraulic motor to adjust the rotating speed of the cooling fan in response to the instruction of the controller;

[0022] The controller is used to:

[0023] adjust the rotating speed of the cooling fan to V0 when T < T1;

[0024] adjust the rotating speed of the cooling fan to V1 when T1≤T < T2;

[0025] linearly adjust the rotating speed of the cooling fan according to the value of T when T2≤T < T3;

[0026] adjust the rotating speed of the cooling fan to V m when T≥T3;

[0027] wherein T is the measured value of the charge air temperature of the internal combustion power pack, T1 is the charge air temperature of the internal combustion power pack when the vehicle is at a station, T3 is the highest intake air temperature when the diesel engine is running; V m is the rated rotating speed of the cooling fan, V1 is the preset rotating speed of the cooling fan when the vehicle is at a station,

[0028] In some embodiments, when the rotating speed of the cooling fan of the internal combustion power pack is linearly adjusted according to the value of T:

[0029] if ΔT1≤ΔT≤ΔT2, the rotating speed of the cooling fan is linearly adjusted according to a first curve;

[0030] if ΔT < ΔT1, the rotating speed of the cooling fan is linearly adjusted according to a second curve;

[0031] if ΔT > ΔT2, the rotating speed of the cooling fan is linearly adjusted according to a third curve;

[0032] Wherein, ΔT is the measured value of the temperature rise rate of the turbocharged air of the internal combustion power pack, ΔT1 is the first temperature rise rate threshold, and ΔT2 is the second temperature rise rate threshold; the expression of the first curve is y=k1*x, the expression of the second curve is y=k2*x, and the expression of the third curve is y=k3*x, y is the rotating speed of the cooling fan, x is the temperature of the turbocharged air of the internal combustion power pack, and k2<k1<k3.

[0033] In some embodiments, when T≥T3, if the demand power of the vehicle on the internal combustion power pack continues to increase, the rotating speed of the cooling fan is kept as V m , and the rotating speed of the internal combustion power pack is adjusted to idle speed.

[0034] The present application has at least the following technical effects or advantages:

[0035] 1. Reducing the noise caused by the cooling fan under the premise of ensuring the heat dissipation demand of the power pack, thereby improving the experience of passengers waiting for the vehicle.

[0036] 2. Setting different rotating speeds of the cooling fan according to different temperature intervals, thereby reducing the energy consumption under the premise of ensuring the heat dissipation demand of the power pack.

[0037] 3. Adaptively adjusting the accelerating rate of the cooling fan according to different temperature rise rates, thereby further reducing the energy consumption under the premise of ensuring the heat dissipation demand of the power pack.

[0038] 4. Providing overheat protection for the internal combustion power pack. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 FIG. 1 is a flowchart of the internal combustion power pack cooling fan rotating speed control method in an embodiment of the present application;

[0040] Figure 2 FIG. 2 is a linear regulation curve diagram of the internal combustion power pack cooling fan rotating speed in an embodiment of the present application;

[0041] Figure 3 FIG. 3 is a structure diagram of the internal combustion power pack cooling fan rotating speed control device in an embodiment of the present application. DETAILED DESCRIPTION

[0042] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in combination with the drawings in the specification and specific embodiments.

[0043] Embodiment One

[0044] Referring to Figure 1 , an internal combustion power pack cooling fan rotating speed control method comprises:

[0045] When T<T1, the rotating speed of the internal combustion power pack cooling fan is adjusted to V0.

[0046] When T1≤T <T2时,将内燃动力包冷却风扇的转速调节为V1;

[0047] When T2≤T <T3时,根据T的值对内燃动力包冷却风扇的转速进行线性调节;

[0048] When T≥T3, adjust the speed of the internal combustion power pack cooling fan to V m ;

[0049] Wherein, T is the measured value of the boost air temperature of the internal combustion power pack, T1 is the boost air temperature of the internal combustion power pack when the vehicle stops at the platform, T3 is the maximum intake temperature of the diesel engine; V m is the rated speed of the cooling fan, V1 is the preset speed of the cooling fan when the vehicle stops at the platform,

[0050] Among them, when the speed of the internal combustion power pack cooling fan is linearly adjusted according to the value of T:

[0051] If ΔT1≤ΔT≤ΔT2, the speed of the cooling fan is linearly adjusted according to the first curve;

[0052] If ΔT<ΔT1, the speed of the cooling fan is linearly adjusted according to the second curve;

[0053] If ΔT>ΔT2, the speed of the cooling fan is linearly adjusted according to the third curve;

[0054] Among them, such as Figure 2 As shown, ΔT is the measured value of the temperature rise rate of the boost air of the internal combustion power pack, ΔT1 is the first temperature rise rate threshold, and ΔT2 is the second temperature rise rate threshold; the expression of the first curve is y=k1*x, the expression of the second curve is y=k2*x, and the expression of the third curve is y=k3*x, where y is the speed of the cooling fan, x is the boost air temperature of the internal combustion power pack, and k2 <k1<k3。第一温升速率阈值ΔT1和ΔT2第二温升速率阈值的具体值可根据实际情况设定,比如可根据正常工况下的增压空气温度上升速率的历史数据来确定,设定低于正常温度上升速率20%为第一温升速率阈值,高于正常温度上升速率20%为第二温升速率阈值。

[0055] Figure 2 In the figure, the first curve indicates that the speed increase rate of the cooling fan is 120 rpm / °C, the second curve indicates that the speed increase rate of the cooling fan is 80 rpm / °C, and the third curve indicates that the speed increase rate of the cooling fan is 200 rpm / °C.

[0056] Further, to realize the overheat protection of the internal combustion power pack, when T≥T3, if the demand power of the vehicle to the internal combustion power pack continues to increase, the rotation speed of the cooling fan is kept as V m The rotation speed of the diesel engine of the internal combustion power pack is adjusted to idle speed, the intake temperature is reduced, and the diesel engine is protected.

[0057] Embodiment Two

[0058] Referring to Figure 3 An internal combustion power pack cooling fan rotation speed control device is applied to a cooling device on an internal combustion power pack, the internal combustion power pack including a diesel engine 1, the cooling device including a hydraulic pump 2, a hydraulic motor 3, and a cooling fan 4, the hydraulic pump 2 being in driving connection with the diesel engine 1, the hydraulic motor 3 being driven by the hydraulic pump 2, and the cooling fan 4 being driven by the hydraulic motor 3; the device further includes an electric regulating valve 5, a temperature sensor 6, and a controller 7, wherein:

[0059] The electric regulating valve 5 is used to adjust the pressure of the hydraulic oil input to the hydraulic motor 3 to adjust the rotation speed of the cooling fan 4 according to the instruction of the controller 7;

[0060] The temperature sensor 6 is used to obtain the supercharged air temperature of the internal combustion power pack;

[0061] The controller 7 is used to:

[0062] When T

[0063] When T1≤T

[0064] When T2≤T

[0065] When T≥T3, the rotation speed of the cooling fan is adjusted to V m ;

[0066] Wherein, T is the measured value of the supercharged air temperature of the internal combustion power pack, T1 is the supercharged air temperature of the internal combustion power pack when the vehicle is at a station, T3 is the highest intake temperature of the diesel engine; V m is the rated rotation speed of the cooling fan, V1 is the preset rotation speed of the cooling fan when the vehicle is at a station,

[0067] When the controller linearly adjusts the rotation speed of the cooling fan of the internal combustion power pack according to the value of T:

[0068] If ΔT1≤ΔT≤ΔT2, the rotation speed of the cooling fan is linearly adjusted according to the first curve;

[0069] If ΔT < ΔT1, the rotation speed of the cooling fan is linearly adjusted according to the second curve;

[0070] If ΔT > ΔT2, the rotation speed of the cooling fan is linearly adjusted according to the third curve;

[0071] Wherein, ΔT is the measured value of the temperature rise rate of the supercharged air of the internal combustion power package, ΔT1 is the first temperature rise rate threshold, ΔT2 is the second temperature rise rate threshold; the expression of the first curve is y=k1*x, the expression of the second curve is y=k2*x, and the expression of the third curve is y=k3*x, y is the rotation speed of the cooling fan, x is the temperature of the supercharged air of the internal combustion power package, and k2<k1<k3.

[0072] Further, to realize the overheat protection of the internal combustion power package, when T≥T3, if the demand power of the vehicle to the internal combustion power package continues to increase, the rotation speed of the cooling fan is kept as V m The rotation speed of the internal combustion power package is adjusted to idle speed.

[0073] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for controlling the rotational speed of a cooling fan of an internal combustion power pack, comprising: When T < T1, adjusting the rotational speed of the cooling fan of the internal combustion power pack to V0; When T1 ≤ T < T2, adjusting the rotational speed of the cooling fan of the internal combustion power pack to V1; When T2 ≤ T < T3, linearly adjusting the rotational speed of the cooling fan of the internal combustion power pack according to the value of T; When T≥T3, adjust the speed of the internal combustion power pack cooling fan to V m ; Wherein, T is the measured value of the boost air temperature of the internal combustion power pack, T1 is the boost air temperature of the internal combustion power pack when the vehicle stops at the platform, T3 is the maximum intake temperature of the diesel engine; V m is the rated speed of the cooling fan, V1 is the preset speed of the cooling fan when the vehicle stops at the platform, 2. The internal combustion power pack cooling fan speed control method according to claim 1, characterized in that: When linearly adjusting the rotational speed of the cooling fan of the internal combustion power pack according to the value of T: If ΔT1 ≤ ΔT ≤ ΔT2, linearly adjusting the rotational speed of the cooling fan according to the first curve; If ΔT < ΔT1, linearly adjusting the rotational speed of the cooling fan according to the second curve; If ΔT > ΔT2, linearly adjusting the rotational speed of the cooling fan according to the third curve; Wherein, ΔT is the measured value of the rising rate of the supercharged air temperature of the internal combustion power pack, ΔT1 is the first temperature rise rate threshold, and ΔT2 is the second temperature rise rate threshold; the expression of the first curve is y = k1 * x, the expression of the second curve is y = k2 * x, and the expression of the third curve is y = k3 * x, y is the rotational speed of the cooling fan, x is the supercharged air temperature of the internal combustion power pack, and k2 < k1 < k3.

3. The internal combustion power pack cooling fan speed control method according to claim 1 or 2, characterized in that: When T≥T3, if the vehicle's demand for the internal combustion power pack continues to increase, the cooling fan speed is kept at V m , adjust the speed of the internal combustion power pack to idle speed.

4. A device for controlling the speed of a cooling fan of an internal combustion power pack, the device being applied to a cooling device on an internal combustion power pack, the internal combustion power pack including a diesel engine, the cooling device including a hydraulic pump, a hydraulic motor, and a cooling fan, the hydraulic pump being transmission-connected to the diesel engine, the hydraulic motor being driven by the hydraulic pump, and the cooling fan being driven by the hydraulic motor; characterized in that: It further includes an electric control valve, a temperature sensor and a controller, The electric control valve is used to respond to the instruction of the controller to adjust the pressure of the hydraulic oil input to the hydraulic motor, so as to adjust the rotational speed of the cooling fan; The temperature sensor is used to obtain the supercharged air temperature of the internal combustion power pack; The controller is used for: When T < T1, adjusting the rotational speed of the cooling fan to V0; When T1 ≤ T < T2, adjusting the rotational speed of the cooling fan to V1; When T2 ≤ T < T3, linearly adjusting the rotational speed of the cooling fan according to the value of T; When T≥T3, adjust the speed of the cooling fan to V m ; Wherein, T is the measured value of the boost air temperature of the internal combustion power pack, T1 is the boost air temperature of the internal combustion power pack when the vehicle stops at the platform, T3 is the maximum intake temperature of the diesel engine; V m is the rated speed of the cooling fan, V1 is the preset speed of the cooling fan when the vehicle stops at the platform, .

5. The internal combustion power pack cooling fan speed control device according to claim 4, characterized in that: When linearly adjusting the rotational speed of the cooling fan of the internal combustion power pack according to the value of T: If ΔT1 ≤ ΔT ≤ ΔT2, linearly adjusting the rotational speed of the cooling fan according to the first curve; If ΔT < ΔT1, linearly adjusting the rotational speed of the cooling fan according to the second curve; If ΔT > ΔT2, linearly adjusting the rotational speed of the cooling fan according to the third curve; Wherein, ΔT is the measured value of the rising rate of the supercharged air temperature of the internal combustion power pack, ΔT1 is the first temperature rise rate threshold, and ΔT2 is the second temperature rise rate threshold; the expression of the first curve is y = k1 * x, the expression of the second curve is y = k2 * x, and the expression of the third curve is y = k3 * x, y is the rotational speed of the cooling fan, x is the supercharged air temperature of the internal combustion power pack, and k2 < k1 < k3.

6. The internal combustion power pack cooling fan speed control device according to claim 4 or 5, characterized in that: When T≥T3, if the vehicle's demand for the internal combustion power pack continues to increase, the cooling fan speed is kept at V m , adjust the speed of the internal combustion power pack to idle speed.

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