A constant speed control method for a pure electric locomotive driver controller

Abstract

The present invention relates to a method for controlling a constant speed of a pure electric locomotive driver controller, comprising: 1) determining the locomotive speed requirement according to the gear position of the driver controller; 2) making a linear correspondence between the gear position of the locomotive driver controller and the locomotive speed; 3) the resistance of the locomotive changes continuously during the running of the locomotive, and the locomotive microcomputer dynamically adjusts the locomotive traction force or electric braking force by a given speed to control the locomotive constant speed. The present invention does not require auxiliary equipment and complex operations; it does not require any hardware changes to the original locomotive, and can reduce the frequency of the locomotive driver operating the driver controller and reduce the driver's work intensity; it can enable the driver to use the driver controller to achieve constant speed control of the locomotive, and has extremely high application value in enterprises with complex terrain and relatively high speed requirements. The driver does not need to frequently operate the driver controller to stabilize the locomotive speed; it improves work efficiency, reduces the driver's labor intensity, and enriches the application scenarios.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and in particular to a constant speed control method for a pure electric locomotive driver controller. Background Art

[0002] The driver controller is the main electrical appliance that controls the operation of the locomotive, giving the locomotive's direction signal, operating condition signal and gear position signal.

[0003] The existing locomotive operation control mainly uses the gear handle signal of the driver controller to give the locomotive power. The microcomputer and traction system convert the driver controller signal into the steering and speed signal of the motor to achieve traction or braking of the locomotive.

[0004] However, the power-controlled locomotive of the driver controller has different speeds on different slopes or scenarios in the same gear. In complex road conditions, in order to achieve a constant speed of the locomotive, the driver needs to constantly adjust the gear of the driver controller, which lacks a humanized design. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a method for controlling the constant speed of a pure electric locomotive driver controller, which does not require any hardware changes to the original locomotive and can reduce the frequency of the locomotive driver operating the driver controller and reduce the driver's workload.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a method for controlling a constant speed of a pure electric locomotive driver controller, comprising the following steps:

[0007] 1) Determine the locomotive speed requirement according to the gear position of the driver controller;

[0008] 2) Make a linear correspondence between the gear position of the locomotive controller and the locomotive speed;

[0009] 3) The resistance of the locomotive changes continuously during its travel. The locomotive microcomputer dynamically adjusts the locomotive traction or electric braking force by giving a given speed to control the locomotive at a constant speed.

[0010] Furthermore, in step 2) of the present invention, the wheel peripheral power of the locomotive motor side is determined according to the locomotive speed requirement, and then the power output of the battery side is determined.

[0011] Furthermore, in step 2) described in the present invention, the driver controller is provided with a gear controller, and the driver controller communicates with the microcomputer via hard wire, and outputs the gear code to the microcomputer, and the microcomputer determines the gear signal of the driver controller after analysis; the locomotive determines the locomotive speed limit M km / h according to the user's application requirements, and the locomotive gear is 0 to N gears, and the corresponding speed of each gear is M / N km / h.

[0012] Furthermore, in step 2) of the present invention, the available power battery side power is calculated based on the collected power battery voltage and the allowable discharge current of the power battery.

[0013] Furthermore, in step 2) of the present invention, the microcomputer adjusts the traction force and wheel power according to the current locomotive speed and the available power of the power battery, so that the locomotive speed is adjusted to the set value.

[0014] Furthermore, the maximum traction force allowed by the locomotive under different levels of the driver controller handle of the present invention is the same.

[0015] Furthermore, in step 3) of the present invention, the locomotive is accelerated and decelerated stably by controlling the locomotive impact limit.

[0016] Furthermore, the present invention determines the locomotive loading rate by setting the upper limit of the locomotive loading rate to a Tmax The average loading rate is a Tave , calculate the real-time loading rate as a n =min[Δt×a Tave +a n-1 , a Tmax ], where Δt is the acceleration update time interval.

[0017] Furthermore, the present invention determines the locomotive load reduction rate by setting the upper limit of the locomotive load reduction rate to a Bmax The average load reduction rate is a Bave , calculate the real-time load reduction rate as a m =min[Δt'×a Bave +a m-1 , a Bmax ], where Δt' is the deceleration update time interval.

[0018] The beneficial effect of the present invention is that it solves the defects existing in the background technology. The gear handle instruction of the locomotive driver controller corresponds to the speed signal. The driver operates the driver controller to determine the locomotive working condition and speed, and then the microcomputer and traction system automatically control the locomotive to run at a constant speed at the target speed, without the need for auxiliary equipment and complicated operations; there is no need to make any hardware changes to the original locomotive, and the frequency of the locomotive driver operating the driver controller can be reduced, reducing the driver's work intensity; the present invention can enable the driver to use the driver controller to achieve constant speed control of the locomotive, which has extremely high application value in enterprises with complex terrain and relatively high speed requirements, and the driver does not need to frequently operate the driver controller to stabilize the locomotive speed; the use of the present invention improves work efficiency, reduces the driver's labor intensity, and enriches the application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a curve diagram of the relationship between the traction force and speed of a traditional locomotive at different handle levels;

[0020] Figure 2 It is a curve diagram showing the relationship between the traction force and speed of the locomotive under constant speed control of the present invention;

[0021] Figure 3 It is a control block diagram of a constant speed control locomotive according to the present invention. DETAILED DESCRIPTION

[0022] The present invention will now be described in further detail in conjunction with the accompanying drawings and preferred embodiments. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0023] The locomotive controller is usually divided into different gears, and the current gear of the locomotive controller is set to N gear. The locomotive speed usually has a limit value, and the current locomotive speed range is set to 0~M km / h. The locomotive gear is linearly corresponding to the locomotive speed. By controlling the locomotive controller and giving the locomotive speed, the locomotive microcomputer dynamically adjusts the locomotive traction or electric braking force according to the given speed to achieve locomotive constant speed control.

[0024] Specifically, a method for controlling a constant speed of a pure electric locomotive driver controller comprises the following steps:

[0025] 1) Determine the locomotive speed requirement according to the gear position of the driver controller;

[0026] 2) Make a linear correspondence between the gear position of the locomotive controller and the locomotive speed;

[0027] 3) The resistance of the locomotive changes continuously during its travel. The locomotive microcomputer dynamically adjusts the locomotive traction or electric braking force by giving a given speed to control the locomotive at a constant speed.

[0028] In step 2), the wheel power on the locomotive motor side is determined according to the locomotive speed requirement, and then the power output on the battery side is determined.

[0029] In step 2), the driver controller is provided with a gear controller, and the driver controller communicates with the microcomputer through hard wires and outputs the gear code to the microcomputer. The microcomputer determines the gear signal of the driver controller after analysis; the locomotive determines the locomotive speed limit M km / h according to the user's application requirements, and the locomotive gear is 0 to N gears, and the corresponding speed of each gear is M / N km / h.

[0030] In step 2), the available power battery side power is calculated based on the collected power battery voltage and the allowable discharge current of the power battery.

[0031] In step 2), according to the current locomotive speed and the available power of the power battery, the microcomputer adjusts the traction force and the wheel power to adjust the locomotive speed to the set value.

[0032] In step 3), the locomotive is accelerated and decelerated stably by controlling the locomotive impact limit.

[0033] The maximum traction force allowed by the locomotive under different levels of the driver controller handle of the present invention is the same.

[0034] The present invention determines the locomotive loading rate by setting the upper limit of the locomotive loading rate to a Tmax The average loading rate is a Tave , calculate the real-time loading rate as a n =min[Δt×a Tave +a n-1 , a Tmax ], where Δt is the acceleration update time interval.

[0035] The present invention determines the locomotive load reduction rate by setting the upper limit of the locomotive load reduction rate to a Bmax The average load reduction rate is a Bave , calculate the real-time load reduction rate as a m =min[Δt'×a Bave +a m-1 , a Bmax ], where Δt' is the deceleration update time interval.

[0036] like Figure 1 The figure shows the relationship between the traction force and speed of a conventional locomotive under constant power control. Figure 1 The downward curve in the figure is the relationship between traction and speed corresponding to the five gears of the driver controller. Figure 1 It can be seen that the acceleration process of the locomotive continuously adjusts the locomotive traction to achieve the target power value of the driver controller. Figure 1 The upward line in the middle is the locomotive resistance curve. According to the constant power control, the locomotive gear must be raised to the fourth gear before the locomotive can be started. If the driver does not change gears after starting, the locomotive resistance will change with factors such as the slope when encountering complex terrain, which may cause the locomotive to overspeed. To avoid this situation, experienced drivers are required to constantly adjust the driver controller to control the driver to run at a stable speed. For working condition application scenarios, locomotive speed control is very important. If the locomotive speed is unstable, it may disrupt the operation of other locomotives.

[0037] like Figure 2 As shown, since the locomotive is a pure electric locomotive, the power source is the power battery, so the output power on the battery side is constant, that is, the maximum output power of the locomotive power battery is known, and the relationship between locomotive speed, power, and traction is P = FV / 3.6, so the locomotive traction is inversely proportional to the locomotive speed. The locomotive power and locomotive traction are adjusted to achieve the target speed. When the speed is constant, the locomotive power is directly proportional to the locomotive traction. The locomotive traction is given by adding or subtracting the acceleration rate or deceleration rate according to a certain step length.

[0038] When the locomotive starts, the microcomputer increases the locomotive traction according to the loading rate until the locomotive reaches the target speed. If the locomotive speed changes due to complex road conditions, the microcomputer will continuously adjust the locomotive traction and power according to the target speed to stabilize the locomotive speed at the target speed. In complex road conditions, the driver does not need to constantly adjust the locomotive gear to stabilize the locomotive speed. When applied in working conditions enterprises, working conditions enterprises can more reasonably plan the use of factory lines according to the set locomotive speed.

[0039] like Figure 3 The figure shows the locomotive constant speed control strategy process. When the microcomputer receives the gear position signal from the driver controller, it adjusts the locomotive traction force according to the current available battery power, traction force upper limit and motor status, and calculates the current actual speed of the locomotive in real time until the actual speed = target speed.

[0040] The above description only describes the specific implementation mode of the present invention. Various examples do not limit the essential content of the present invention. After reading the description, ordinary technicians in the relevant technical field can modify or deform the specific implementation modes described above without departing from the essence and scope of the invention.

Claims

1. A method for controlling a constant speed of a pure electric locomotive driver controller, characterized in that: The following steps are included: 1) Determine the locomotive speed requirement according to the gear position of the driver controller; 2) Make a linear correspondence between the gear position of the locomotive driver controller and the locomotive speed; include, Determine the wheel power on the locomotive motor side according to the locomotive speed requirements, and then determine the power output on the battery side; The driver controller is equipped with a gear controller. The driver controller communicates with the microcomputer through hard wires and outputs the gear code to the microcomputer. The microcomputer determines the gear signal of the driver controller after analysis. The locomotive determines the locomotive speed limit M km / h according to the user's application requirements. The locomotive gear is 0~N gears, and the corresponding speed of each gear is M / N km / h. Calculate the available power battery side power according to the collected power battery voltage and the allowable discharge current of the power battery; According to the current locomotive speed and available power battery power, the microcomputer adjusts the traction force and wheel power to adjust the locomotive speed to the set value; 3) The resistance of the locomotive changes continuously during its travel. The locomotive microcomputer dynamically adjusts the locomotive traction or electric braking force by giving a given speed to control the locomotive constant speed; the locomotive acceleration and deceleration are stabilized by controlling the locomotive impact limit; The locomotive loading rate is determined by setting the upper limit of the locomotive loading rate to a Tmax The average loading rate is a Tave , calculate the real-time loading rate as a n =min[Δt×a Tave +a n-1 , a Tmax ], where Δt is the acceleration update time interval; The method for determining the locomotive load reduction rate is to set the upper limit of the locomotive load reduction rate to a Bmax The average load reduction rate is a Bave , calculate the real-time load reduction rate as a m =min[Δt'×a Bave +a m-1 , a Bmax ], where Δt' is the deceleration update time interval; The maximum traction allowed by the locomotive at different levels of the driver's controller handle is the same.

Images