A fuel-saving bench test device for an electronically controlled generator

Abstract

The present invention belongs to the technical field of engine testing, and particularly relates to an electronically controlled generator fuel-saving bench test device, comprising an electronically controlled generator brake air circuit system with a controller and a bench measurement and control system. The bench measurement and control system can receive vehicle fuel consumption cycle test data, and control the engine and brake pedal to operate according to the working conditions of the vehicle fuel consumption cycle test. The present invention overcomes the problem that it is difficult to accurately measure a tiny fuel saving rate due to human error on the bench, and is suitable for engine bench fuel-saving testing.

Description

Technical Field

[0001] The invention belongs to the technical field of engine test and discloses a fuel-saving bench test device for an electronically controlled generator. Background Art

[0002] The fuel consumption of a vehicle is an economic technical indicator of the vehicle. Lower fuel consumption is beneficial to environmental protection and energy conservation, and can also better reflect the competitiveness of the vehicle product. At present, electronic control of engine accessories is an important technical measure for engine fuel saving. For example, the electronically controlled water pump, electronically controlled oil pump, and electronically controlled generator attached to the engine can save more fuel and reduce consumption than conventional mechanical control components.

[0003] The fuel-saving strategy of the electronically controlled generator is to monitor the temperature, current, voltage, power and other information of the car battery at any time through the battery sensor, and transmit it to the engine control unit in real time. The engine control unit makes a comprehensive judgment based on the battery status, engine operating status and other information, and controls the electronically controlled generator regulator to increase or decrease the generator output voltage. When the battery power is low, the engine control unit controls the generator to increase the output voltage to quickly charge the battery; conversely, when the battery power is high, the generator output voltage is reduced, and the engine torque output to the generator is reduced, so as to reduce fuel consumption and CO2 emissions; the charging efficiency of the electronically controlled generator to the battery is positively correlated with the output voltage of the electronically controlled generator and the speed of the engine driving the electronically controlled generator, so the consistency of the engine speed is crucial during the test process, which is also an important reason why this patent needs to convert the vehicle fuel consumption test conditions into engine bench test conditions.

[0004] The factors affecting the fuel-saving efficiency of the electronically controlled generator under different control strategies are mainly the actual working time of the electronically controlled generator caused by the power consumption of the electrical equipment under different control strategies. However, the fuel-saving rate between different control strategies of the electronically controlled generator is generally only less than 3% in the NEDC cycle fuel consumption or C-WTVC and other fuel consumption regulation cycle tests. When the fuel consumption level of the electronically controlled generator is tested on the road or on the whole vehicle rotating hub dynamometer, even if the same driver has different braking time and braking time points during each test, the fuel consumption test will be different. The difference will be greater when different drivers operate, and the error caused by this may even exceed 3%. In addition, the fuel consumption cycle test on the engine bench avoids the influence of human factors. Although it can theoretically solve the problems of test errors and poor repeatability, it is difficult to implement. There are mainly problems such as how to control the brake pedal of the whole vehicle, how to synchronize the brake pedal control signal and the test condition data, etc. Therefore, the electronically controlled generator manufacturers and vehicle manufacturers are unable to come up with real data on the fuel saving of electronically controlled generators in engineering applications. Summary of the invention

[0005] In view of the above problems, the present invention provides an electronically controlled generator fuel-saving bench test device, comprising a bench measurement and control system 4 that is communicatively connected to an electronic load 6 or a main electrical device and its switch, an electronically controlled generator 3 and a vehicle battery 5, and a bench dynamometer 1 that is hinged to the crankshaft of an engine 2. The electronic load 6 or the main electrical device and its switch, the electronically controlled generator 3 and the vehicle battery 5 are connected in parallel. The bench measurement and control system 4 can receive data sent back by the bench dynamometer 1, compare it with the vehicle fuel consumption cycle test data, and control the engine 2 to operate according to the working conditions of the vehicle fuel consumption cycle test.

[0006] The above device can conveniently transplant the working conditions of the vehicle fuel consumption cycle test onto the engine test bench, making it easy to conduct fuel saving rate tests for different control strategies of the electronically controlled generator under the condition of consistent working conditions and compliance with industry test standards.

[0007] Preferably, the test bench measurement and control system 4 can also receive data sent back by the pressure sensor in the brake air chamber, and use a proportional-integral-differential (PID) control method to drive the brake pedal to move according to the working conditions of the vehicle fuel consumption cycle test.

[0008] This configuration uses closed-loop control, and with all sensors and servo systems responding sensitively, it can more accurately reproduce the operating conditions of the vehicle fuel consumption cycle test on the laboratory engine test bench.

[0009] Preferably, the test bench measurement and control system 4 can control the brake pedal to move at a uniform speed according to the working conditions of the fuel consumption cycle test.

[0010] This simplifies the working condition transplantation process, reduces possible fault defects caused by too many components, and eliminates the fuel consumption deviation caused by the lag phenomenon in the closed-loop control that may cause the actual pressure curves of the brake chamber to not coincide in multiple tests.

[0011] Furthermore, the test bench measurement and control system 4 can control the switches of the main electrical equipment to simulate the power consumption status of the entire vehicle.

[0012] This will make the fuel-saving tests conducted on the bench more realistic and can more accurately point the direction for the fuel-saving strategy of the electronically controlled generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is the vehicle speed and torque condition to which the electronically controlled generator fuel-saving bench test device according to the embodiment of the present invention is subjected to reference;

[0014] Figure 2 is the brake chamber pressure condition to which the fuel-saving bench test device for the electronically controlled generator in the embodiment of the present invention is referred;

[0015] Figure 3It is the operating condition of the electric equipment to which the fuel-saving bench test device for the electric-controlled generator in the embodiment of the present invention refers;

[0016] Figure 4 It is a layout diagram of an electronic load without a physical switch in parallel with an electronically controlled generator fuel-saving bench test device in an embodiment of the present invention;

[0017] Figure 5 It is a layout diagram of an electric-controlled generator fuel-saving bench test device in parallel with an electric device with a switch in an embodiment of the present invention;

[0018] Among them: 1. Bench dynamometer; 2. Engine; 3. Electronically controlled generator; 4. Bench measurement and control system; 5. Vehicle battery; 6. Electronic load; 7. Headlights; 8. Air conditioner; 9. Wipers; 10. Other electrical appliances. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making innovative efforts are within the scope of protection of the present invention.

[0020] There are two ways and methods to obtain the basic data of vehicle fuel consumption cycle conditions. One is to conduct a vehicle fuel consumption regulation cycle test on a vehicle rotary test bench according to the vehicle fuel consumption regulation cycle (such as NEDC, C-WTVC and other fuel consumption regulation cycles); the other is to use the actual vehicle road to collect road spectrum parameters. The road conditions can cover 40% of urban conditions, 40% of suburban or rural conditions, and 30% of high-speed conditions. The specific distribution ratio of conditions can be determined according to the application market environment of the vehicle. Which method is selected as the basic data of the vehicle fuel consumption cycle condition as the fuel saving efficiency test of different control strategies of the electronically controlled generator depends on the company's own development purpose. Therefore, the vehicle fuel consumption cycle condition scheme can be freely selected. Which method is used for road spectrum parameter collection can be applied to the subsequent scheme description of the patent of this invention; this patent simplifies the subsequent test scheme description and is unified as the vehicle C-WTVC condition fuel consumption regulation cycle.

[0021] When the C-WTVC fuel consumption regulation cycle is performed on the vehicle's rotating hub, when the vehicle's rotating hub dynamometer enters the C-WTVC condition, the vehicle's OBD terminal interface reads and records the engine speed (OBD_EngineSpeed) and engine torque (OBD_RealTorque) in the vehicle's ECU at a frequency of 1HZ, and obtains a list of engine speed parameters and engine torque parameters for 1800s as the operating condition of the engine bench C-WTVC.

[0022] The engine speed and engine torque signals collected from the vehicle hub test are converted to the engine dynamometer test bench, and the engine speed and torque conditions in the vehicle C-WTVC test conditions are simulated by controlling the actions of the accelerator pedal and the clutch pedal. The brake pedal displacement actuator is controlled to push the brake pedal according to the brake chamber pressure value. The brake pedal displacement actuator can adjust the action of the brake pedal through the PID feedback of the brake chamber pressure signal of the brake chamber pressure sensor, so that the above-mentioned vehicle engine speed and engine torque C-WTVC conditions are used in various subsequent different power load test conditions, which can effectively avoid the inconsistency of each test driving operation caused by human factors; the fuel saving efficiency test of the electronically controlled generator under different vehicle power load conditions is realized under the same test condition, avoiding the influence of the engine speed on the charging efficiency of the electronically controlled generator on the battery charging efficiency.

[0023] Identification of vehicle electrical appliance usage scenarios: The vehicle electrical appliance usage scenarios can be divided into the following categories: spring and autumn (daytime and nighttime), summer (daytime and nighttime), sunny and rainy days, and comprehensive scenarios; auxiliary electrical equipment such as window lifters and audio systems do not have high power and can be exempted from the test during the test; the usage scenarios of other electrical equipment can be set by referring to the table below. Comprehensive scenarios simulate complex electrical usage scenarios and can be designed according to the usage scenarios of the vehicle electrical appliances, such as allowing air conditioners, lights, wipers and other electrical appliances to work alternately as shown in the table below.

[0024]

[0025] On the engine test bench, the vehicle battery 5, vehicle lights 7, air conditioner 8, wiper 9 and other electrical appliances 10 are electrically connected to the electronically controlled generator 3; the test bench dynamometer 1 is mechanically connected to the engine 2; the operation of the electronically controlled engine 3 is driven by the engine 2; the voltage output of the electronically controlled engine 3 is controlled by the engine control unit, and the battery sensor can monitor the temperature, current, voltage, power and other information of the vehicle battery at any time, and transmit it to the engine control unit in real time. The engine control unit comprehensively judges and controls the generator regulator according to the battery status, engine operating status and other information to realize the control strategy of increasing or decreasing the generator output voltage; the test bench measurement and control system 4 controls the engine 2 according to the information sent back by the engine test bench dynamometer 1 and the brake air chamber. Figure 1 The ports DO1\DO2\DO3\DO4 of the test bench measurement and control system 4 are electrically connected to the relays K1\K2\K3\K4 to control the on and off of the relays, which can realize the linkage control of the engine C-WTVC working condition and the vehicle electrical appliances. It is feasible to transfer the vehicle electrical appliances to the engine test bench and let the vehicle electrical appliances work according to the working state of the electrical appliance usage scenario, but this method involves the allocation and installation of the vehicle electrical appliances, which is time-consuming and labor-intensive.

[0026] By using an electronic load to simulate the power consumption of the vehicle electrical appliances, the test bench can be built conveniently and quickly. The electronic load 6 replaces the vehicle electrical appliances; the electronic load 6 is electrically connected to the vehicle battery 5 and the bench measurement and control system 4. The electronic load 6 provides electronic load according to the control requirements of the bench measurement and control system 4, and consumes electricity from the vehicle battery 5.

[0027] An example is given to illustrate the linkage between electronic load and C-WTVC:

[0028] For example, the power of the air conditioner is A, the power of the headlight is B, and the power of the wiper is C; when the air conditioner is required to work, the headlight is not working, and the wiper is working, the electronic load 6 will consume (A+C) electricity from the vehicle battery. The test bench measurement and control system outputs analog signals to the electronic load device according to the C-WTVC working condition time point, and the electronic load device provides load power as required. The test bench measurement and control system analog signals and electronic load power are in correspondence, as shown in the following table.

[0029]

[0030]

[0031] Before each test of the electronically controlled generator, the battery charge of the vehicle must be kept consistent.

[0032] When running the C-WTVC test, the engine control unit controls the reading of battery temperature, current, voltage, power and other information monitored by the battery sensor. The engine control unit comprehensively judges and controls the generator regulator based on information such as the battery status and engine operating status to implement the control strategy of increasing or decreasing the generator output voltage.

[0033] Engine test bench control system Figure 1 The C-WTVC working condition and the electrical appliance working scenario in Table 1 require controlling the engine and electrical appliance load.

[0034] Beneficial effects of implementing the present invention:

[0035] By transplanting the whole vehicle test to the engine test bench, the indifference between the engine bench fuel consumption test results and the actual fuel consumption test of the whole vehicle is guaranteed to the greatest extent.

[0036] The test bench realizes the control of the usage scenarios of the vehicle's electrical appliances. At the same time, the electronic load is used to simulate the vehicle's electrical appliances, which saves the time and cost of setting up the test bench and allows for flexible test design of the electronic load.

[0037] The power generation of the electronically controlled generator is positively correlated with the engine speed. At the same time, the engine torque will affect the control strategy of the engine controller on the electronically controlled generator. Therefore, the method of converting the vehicle fuel consumption cycle condition into the test bench fuel consumption cycle condition can effectively control the consistency of the test conditions and ensure the same test condition benchmark.

[0038] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computers, available storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program codes.

[0039] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1A device that provides the functions specified in a block or multiple blocks.

[0040] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0041] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0042] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fuel-saving bench test device for an electronically controlled generator, characterized in that: The invention comprises a bench measurement and control system (4) which is communicatively connected to an electronic load (6) or a main electrical equipment and its switch, an electronically controlled generator (3) and a vehicle battery (5), and a bench dynamometer (1) which is articulated to the crankshaft of an engine (2). The electronic load (6) or the main electrical equipment and its switch, the electronically controlled generator (3) and the vehicle battery (5) are connected in parallel. The battery sensor can monitor the temperature, current, voltage and power information of the vehicle battery (5) at any time and transmit the information to the engine control unit in real time. The engine control unit can make a comprehensive judgment and control the generator regulator according to the battery status and engine operation status information to realize the control strategy of increasing or decreasing the output voltage of the electronically controlled generator (3). The bench measurement and control system (4) can receive the data sent back by the bench dynamometer (1), compare it with the vehicle fuel consumption cycle test data, receive the data sent back by the pressure sensor in the brake air chamber, and use the proportional-integral-differential (PID) control method to drive the brake pedal to move according to the working conditions of the vehicle fuel consumption cycle test.

2. The fuel-saving bench test device for an electronically controlled generator as claimed in claim 1, characterized in that The bench measurement and control system (4) can control the brake pedal to move at a uniform speed according to the working conditions of the oil consumption cycle test.

3. The fuel-saving bench test device for an electronically controlled generator as claimed in claim 2, characterized in that The test bench measurement and control system (4) can control the switches of the main electrical equipment and simulate the electrical consumption status of the entire vehicle.

Images