Method and device for improving engine fuel economy

Abstract

The present invention provides a method and device for improving the fuel economy of an engine. The method formulates a suitable control logic according to the current state of the vehicle, and makes the accelerator pedal output signal of the vehicle always the minimum value without violating the driving intention of the driver, so as to achieve the purpose of improving the fuel economy. The device establishes feedback between the engine and the transmission system through an electronic control unit, and inputs the accelerator pedal input signal P1, the driving speed signal S, the crankshaft position signal E, the engine crank position signal X, the engine speed R and other parameters into the electronic control unit at any time, and uses the method to process the above signals. The fuel control unit calculates the final accelerator pedal output signal P2 that meets the fuel economy in the current state, and synchronously adjusts the current control parameters to the above-mentioned optimized solution, so that the engine works at a more economical level, ensuring the fuel economy of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle control, and in particular to a method and a device for improving the fuel economy of an engine. Background Art

[0002] The fuel economy of a vehicle depends on many factors. Human factors include: the vehicle is driven at too high a speed; the gear selected is too low and the engine speed is too high; the accelerator pedal is stepped on sharply, causing the engine load to surge; the engine of a truck is operated at or close to its performance limit when lightly loaded; the engine is not shut down when the vehicle is idling, etc. All of the above situations will result in poor fuel economy. Usually the vehicle has its own electronic control unit and sensors related to driving conditions (such as Figure 1 As shown in the figure, it is of great significance to study how to improve the fuel economy of a vehicle without changing the vehicle's own equipment. Summary of the invention

[0003] In order to solve the shortcomings of the existing methods, the present invention provides a method and device for improving the fuel economy of an engine. The method formulates a suitable control logic according to the current condition of the vehicle, so that the accelerator pedal input signal of the vehicle is always at a minimum value, thereby achieving the purpose of improving fuel economy. Furthermore, a fuel control unit is designed, and when the operation will cause sudden acceleration, the fuel control unit can "cheat" the engine into thinking that the demand for it is reduced. Therefore, in this case, the fuel economy of the engine is expected to be improved.

[0004] The technical solution of the present invention to solve the technical problem is to design a method for improving engine fuel economy, characterized in that the method is applicable to two different scenarios: a vehicle free driving mode and a threshold preset mode. When the vehicle is in the free driving mode, the method comprises the following steps:

[0005] Step 1: The electronic control unit on the vehicle reads multiple sensor information. The accelerator pedal sensor detects the accelerator pedal travel or angle position to obtain the accelerator pedal input signal P. 1 The engine speed sensor measures the engine speed to obtain the crankshaft position signal E; the drive shaft position sensor measures the drive shaft angle to obtain the drive shaft position signal D;

[0006] Step 2: Based on the accelerator pedal input signal P obtained in step 1 1 , the frequency of the drive shaft position signal D is detected to obtain the vehicle's running speed S, and the crankshaft position signal E is detected to obtain the engine speed R;

[0007] Step 3: Perform dS / dt operation on the driving speed S obtained in step 2 to obtain acceleration A; call the inverse function or inverse square function on the engine speed R obtained in step 2 to obtain the maximum acceleration signal AMax ;

[0008] Step 4: The maximum acceleration signal A obtained in step 3 Max Subtract the acceleration A to get the comparison signal A Max -A;

[0009] Step 5: Comparison signal A obtained in step 4 Max -A, according to its positive and negative signs, determines the accelerator pedal input signal P 1 Increase the preset amount dP or decrease the preset amount dP, when A Max -A is the normal input signal P for the accelerator pedal 1 Increase the preset amount dP to generate the pedal limit signal P LimA ; when A Max -A is negative, the accelerator pedal input signal P 1 Increase the preset amount dP to generate the pedal limit signal P LimA ;

[0010] Step 6: Convert the pedal limit signal P obtained in step 5 LimA With the accelerator pedal input signal P 1 Compare the sizes and output the smaller value, which is the final output accelerator pedal signal P 2 ;

[0011] When the vehicle is in a threshold preset mode, the method comprises the following steps:

[0012] Step 1: The electronic control unit on the vehicle reads multiple sensor information. The accelerator pedal sensor detects the accelerator pedal travel or angle position to obtain the accelerator pedal input signal P. 1 The engine speed sensor measures the engine speed to obtain the crankshaft position signal E; the drive shaft position sensor measures the drive shaft angle to obtain the drive shaft position signal D;

[0013] Step 2: Based on the accelerator pedal input signal P obtained in step 1 1 , the frequency of the drive shaft position signal D is detected to obtain the vehicle's running speed S, and the crankshaft position signal E is detected to obtain the engine speed R;

[0014] Step 3: Perform dS / dt operation on the driving speed S obtained in step 2 to obtain acceleration A; call the inverse function or inverse square function on the engine speed R obtained in step 2 to obtain the maximum acceleration signal A Max ;

[0015] Step 4: The driving speed S and engine speed R obtained in step 2, as well as the acceleration A and the maximum acceleration signal A obtained in step 3 are calculated. Max , and the preset maximum driving speed SMax , preset maximum engine speed R Max The corresponding difference is obtained to obtain the comparison signal S Max -S, A Max -A, R Max -R;

[0016] Step 5: Three comparison signals S obtained in step 4 Max -S, A Max -A, R Max -R, according to its positive and negative signs, determines the accelerator pedal input signal P 1 Increase the preset amount dP or decrease the preset amount dP; when the comparison signal S Max -S is positive, then the accelerator pedal input signal P 1 Increase the predetermined amount dP to generate a pedal limit signal P according to the driving speed Lims ; When the comparison signal S Max -S is negative, then the accelerator pedal input signal P 1 Decrease the predetermined amount dP to generate a pedal limit signal P according to the driving speed Lims ;

[0017] When the comparison signal A Max -A is positive, then the accelerator pedal input signal P 1 Increase the predetermined amount dP to generate a pedal limit signal P according to the acceleration LimA ; When the comparison signal A Max -A is negative, then the accelerator pedal input signal P 1 Decrease the predetermined amount dP to generate a pedal limit signal P according to the acceleration LimA ;

[0018] When the comparison signal R Max -R is positive, then the accelerator pedal input signal P 1 Increase the preset amount dP 1 , to generate a pedal limit signal P according to the engine speed LimR ; When the comparison signal R Max -R is negative, then the accelerator pedal input signal P 1 Decrease the predetermined amount dP to generate a pedal limit signal P according to the engine speed LimR ;

[0019] Step 6: The pedal limit signal P obtained in step 5 based on the acceleration LimA、 Pedal limit signal P according to engine speed LimR and the pedal limit signal P according to the driving speed Lims With the accelerator pedal input signal P 1 Compare the sizes and output the minimum value, which is the final output accelerator pedal signal P2 ;

[0020] The electronic control unit on the vehicle receives the output accelerator pedal signal P obtained in step 6 2 , and according to the output accelerator pedal signal P 2 Automatically control and adjust the output of the accelerator pedal so that the output accelerator pedal signal P 2 As a new accelerator pedal input signal, and continuously repeat steps 1 to 6, so that the accelerator pedal input signal of the vehicle is always at the minimum value.

[0021] Furthermore, the present invention is directed to a device for improving engine fuel economy, characterized in that the device is used to implement the method for improving engine fuel economy as described above; the device includes a fuel control unit, the fuel control unit includes a GPS module, a GSM module, a USB interface, a core processor and a memory, the core processor model is MPC5675K, and the GPS module model is VK2828U8G5L; the fuel control unit is connected to the engine crankshaft position sensor, the drive shaft position sensor, the accelerator pedal sensor and the electronic control unit; the memory has a built-in detection module, a differential module, a search module, a comparison module, an increment / decrement module, and a minimization module; the detection module It mainly receives the accelerator pedal signal, crankshaft position signal and drive shaft position signal, and converts the signal into driving speed and engine speed, and outputs them to the differential module and search module respectively; the differential module receives the driving speed and executes the dS / dt function to output the acceleration; the search module receives the engine speed and runs the compiled program to obtain the maximum acceleration signal; the comparison module determines the sign of the difference between the threshold and the instantaneous value; if it is positive, the increment module is executed, and if it is negative, the decrement module is executed to obtain the pedal limit signal; the minimization module receives the accelerator pedal input signal and the pedal limit signal, and outputs the minimum value to the electronic control unit, which is used as the final accelerator pedal signal to regulate the vehicle's power system;

[0022] The memory implements the settings of the detection module, the differentiation module, the search module, the comparison module, the increment / decrement module, and the minimization module through at least one instruction, at least one program, the code set, or the instruction set. The at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the core processor to implement the method for improving engine fuel economy as described above.

[0023] Compared with the prior art, the technical effects of the present invention are:

[0024] This method develops appropriate control logic according to the current condition of the vehicle, so that the vehicle's accelerator pedal output signal is always at the minimum value without violating the driver's driving intention, thereby achieving the purpose of improving fuel economy. The device establishes feedback between the engine and the transmission system through the electronic control unit, and converts the accelerator pedal input signal P 1 , driving speed signal S, crankshaft position signal E, engine crank position signal X, engine speed R and other parameters are input into the electronic control unit at any time, and the above signals are processed by the method described above, and the fuel control unit calculates the final accelerator pedal output signal P that meets the fuel economy in the current state 2 The current control parameters are synchronously adjusted to the above-mentioned optimized solution, so that the engine works at a more economical level and the fuel economy of the system is ensured. Therefore, the present invention will bring the technical effect of improving fuel economy and reducing exhaust emissions as much as possible without violating the driver's wishes. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a block diagram of the traditional vehicle engine control system;

[0026] Figure 2 The method for improving the fuel economy of an engine according to the present invention is a flowchart of the steps, wherein Figure 2 (a) is a flowchart of the steps of an embodiment when the vehicle is in free driving mode; Figure 2 (b) is a flowchart of the steps of an embodiment when the vehicle is in a threshold preset mode;

[0027] Figure 3 A control principle block diagram of an embodiment of the device for improving engine fuel economy of the present invention;

[0028] Figure 4 This is a control principle block diagram of another embodiment of the device for improving engine fuel economy of the present invention.

[0029] Figure 5 A control flow chart of an embodiment of the device for improving engine fuel economy of the present invention when the vehicle is in a free driving mode;

[0030] Figure 6 The present invention is a control flow chart of an embodiment of the device for improving engine fuel economy when the vehicle is in a threshold preset mode. DETAILED DESCRIPTION

[0031] The present invention is now described in detail with reference to the accompanying drawings and specific embodiments.

[0032] The present invention provides a method for improving engine fuel economy, which is applicable to two different scenarios: a vehicle free driving mode and a threshold preset mode. When the vehicle is in the free driving mode, the method comprises the following steps:

[0033] Step 1: The electronic control unit on the vehicle reads multiple sensor information. The accelerator pedal sensor detects the accelerator pedal travel or angle position to obtain the accelerator pedal input signal P. 1 The engine speed sensor measures the engine speed to obtain the crankshaft position signal E; the drive shaft position sensor measures the drive shaft angle to obtain the drive shaft position signal D;

[0034] Step 2: Based on the accelerator pedal input signal P obtained in step 1 1 , the frequency of the drive shaft position signal D is detected to obtain the vehicle's running speed S, and the crankshaft position signal E is detected to obtain the engine speed R;

[0035] Step 3: Perform dS / dt operation on the driving speed S obtained in step 2 to obtain acceleration A; call the inverse function or inverse square function on the engine speed R obtained in step 2 to obtain the maximum acceleration signal A Max ;

[0036] Step 4: The maximum acceleration signal A obtained in step 3 Max Subtract the acceleration A to get the comparison signal A Max -A;

[0037] Step 5: Comparison signal A obtained in step 4 Max -A, according to its positive and negative signs, determines the accelerator pedal input signal P 1 Increase the preset amount dP or decrease the preset amount dP, when A Max -A is the normal input signal P for the accelerator pedal 1 Increase the preset amount dP to generate the pedal limit signal P LimA ; when A Max -A is negative, the accelerator pedal input signal P 1 Increase the preset amount dP to generate the pedal limit signal P LimA ;

[0038] Step 6: Convert the pedal limit signal P obtained in step 5 LimA With the accelerator pedal input signal P 1 Compare the sizes and output the smaller value, which is the final output accelerator pedal signal P 2 ;

[0039] When the vehicle is in a threshold preset mode, the method comprises the following steps:

[0040] Step 1: The electronic control unit on the vehicle reads multiple sensor information. The accelerator pedal sensor detects the accelerator pedal travel or angle position to obtain the accelerator pedal input signal P. 1 The engine speed sensor measures the engine speed to obtain the crankshaft position signal E; the drive shaft position sensor measures the drive shaft angle to obtain the drive shaft position signal D;

[0041] Step 2: Based on the accelerator pedal input signal P obtained in step 1 1 , the frequency of the drive shaft position signal D is detected to obtain the vehicle's running speed S, and the crankshaft position signal E is detected to obtain the engine speed R;

[0042] Step 3: Perform dS / dt operation on the driving speed S obtained in step 2 to obtain acceleration A; call the inverse function or inverse square function on the engine speed R obtained in step 2 to obtain the maximum acceleration signal A Max ;

[0043] Step 4: The driving speed S and engine speed R obtained in step 2, as well as the acceleration A and the maximum acceleration signal A obtained in step 3 are calculated. Max , and the preset maximum driving speed S Max , preset maximum engine speed R Max The corresponding difference is obtained to obtain the comparison signal S Max -S, A Max -A, R Max -R;

[0044] Step 5: Three comparison signals S obtained in step 4 Max -S, A Max -A, R Max -R, according to its positive and negative signs, determines the accelerator pedal input signal P 1 Increase the preset amount dP or decrease the preset amount dP; when the comparison signal S Max -S is positive, then the accelerator pedal input signal P 1 Increase the predetermined amount dP to generate a pedal limit signal P according to the driving speed Lims ; When the comparison signal S Max -S is negative, then the accelerator pedal input signal P 1 Decrease the predetermined amount dP to generate a pedal limit signal P according to the driving speed Lims ;

[0045] When the comparison signal A Max -A is positive, then the accelerator pedal input signal P 1 Increase the predetermined amount dP to generate a pedal limit signal P according to the acceleration LimA ; When the comparison signal A Max -A is negative, then the accelerator pedal input signal P1 Decrease the predetermined amount dP to generate a pedal limit signal P according to the acceleration LimA ;

[0046] When the comparison signal R Max -R is positive, then the accelerator pedal input signal P 1 Increase the preset amount dP 1 , to generate a pedal limit signal P according to the engine speed LimR ; When the comparison signal R Max -R is negative, then the accelerator pedal input signal P 1 Decrease the predetermined amount dP to generate a pedal limit signal P according to the engine speed LimR ;

[0047] Step 6: The pedal limit signal P obtained in step 5 based on the acceleration LimA、 Pedal limit signal P according to engine speed LimR and the pedal limit signal P according to the driving speed Lims With the accelerator pedal input signal P 1 Compare the sizes and output the minimum value, which is the final output accelerator pedal signal P 2 ;

[0048] The electronic control unit on the vehicle receives the output accelerator pedal signal P obtained in step 6 2 , and according to the output accelerator pedal signal P 2 Automatically control and adjust the output of the accelerator pedal so that the output accelerator pedal signal P 2 As a new accelerator pedal input signal, and continuously repeat steps 1 to 6, so that the accelerator pedal input signal of the vehicle is always at the minimum value.

[0049] Furthermore, the present invention provides a device for improving the fuel economy of an engine (hereinafter referred to as the device), which is used to implement the method for improving the fuel economy of an engine as described above; the device includes a fuel control unit, the fuel control unit includes a GPS module, a GSM module, a USB interface, a core processor and a memory, the core processor model is MPC5675K, and the GPS module model is VK2828U8G5L; the fuel control unit is connected to the engine crankshaft position sensor, the drive shaft position sensor, the accelerator pedal sensor and the electronic control unit; a built-in detection module, a differential module, a search module, a comparison module, an increment / decrement module, and a minimization module; the detection module mainly performs the functions of receiving the accelerator pedal signal, the crankshaft position signal, and the drive shaft position signal, and converts the signal into the driving speed and the engine speed and outputs it to the differential module and the search module respectively. The differential module receives the driving speed and executes the dS / dt function to output the acceleration. The search module receives the engine speed and runs the compiled program to obtain the maximum acceleration signal. The comparison module determines the sign of the difference between the threshold and the instantaneous value; if it is positive, the increment module is executed, and if it is negative, the decrement module is executed to obtain the pedal limit signal; after the minimization module receives the accelerator pedal input signal and the pedal limit signal, it outputs the minimum value to the electronic control unit, which is used as the final accelerator pedal signal to regulate the vehicle's power system.

[0050] The memory implements the settings of the detection module, the differentiation module, the search module, the comparison module, the increment / decrement module, and the minimization module through at least one instruction, at least one program, the code set, or the instruction set. The at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the core processor to implement the method for improving engine fuel economy as described above.

[0051] The process of the device implementing the method for improving engine fuel economy is specifically as follows:

[0052] When the vehicle is in free driving mode, the method comprises the following steps:

[0053] Step 1: The electronic control unit on the vehicle reads multiple sensor information. The accelerator pedal sensor detects the accelerator pedal travel or angle position to obtain the accelerator pedal input signal P. 1 The engine speed sensor measures the engine speed to obtain the crankshaft position signal E. The drive shaft position sensor measures the drive shaft angle to obtain the drive shaft position signal D.

[0054] Step 2: Based on the accelerator pedal input signal P obtained in step 1 1 , crankshaft position signal E, the first detection module detects the frequency of the drive shaft position signal D, and the second detection module detects the crankshaft position signal E, and obtains the vehicle's driving speed S and engine speed R respectively.

[0055] Step 3: Based on the driving speed S obtained in step 2, the differential module receives the driving speed S, performs dS / dt operation, and outputs acceleration A. Based on the engine speed R obtained in step 2, the search module receives the engine speed R, runs the compiled program, and the program calls the inverse function or inverse square function to generate the maximum acceleration signal A. Max .

[0056] Step 4: Based on the acceleration A obtained in step 3, the comparison module compares it with the maximum acceleration A Max Make a difference and get the comparison signal A Max -A.

[0057] Step 5: Comparison signal A obtained in step 4 Max -A, depending on its positive or negative sign, determines whether to execute the increment module function or the decrement module function, A Max -A is a regular execution of the incremental module function, adding a predetermined amount dP (for example, 20% per second, the same below) to the accelerator pedal input signal P 1 On, generate pedal limit signal P LimA ; A Max -A is negative, the decrement module function is executed, and the input signal P from the accelerator pedal 1 Subtract the predetermined amount dP from the value to generate the pedal limit signal P LimA .

[0058] Step 6: Pedal limit signal P obtained in step 5 LimA , minimizing the module's response to the pedal limit signal P LimA and the accelerator pedal input signal P 1 Perform an operation, compare the two values, and output the smaller value. The output value is the final output accelerator pedal signal P 2 .

[0059] When the vehicle is in a threshold preset mode, the method comprises the following steps:

[0060] Step 1: The electronic control unit on the vehicle reads multiple sensor information. The accelerator pedal sensor detects the accelerator pedal travel or angle position to obtain the accelerator pedal input signal P. 1 The engine speed sensor measures the engine speed to obtain the crankshaft position signal E. The drive shaft position sensor measures the drive shaft angle to obtain the drive shaft position signal D.

[0061] Step 2: Based on the accelerator pedal input signal P obtained in step 1 1 , crankshaft position signal E, the first detection module detects the frequency of the drive shaft position signal D, and the second detection module detects the crankshaft position signal E, and obtains the vehicle's driving speed S and engine speed R respectively.

[0062] Step 3: Based on the driving speed S obtained in step 2, the differential module receives the driving speed S, performs dS / dt operation, and outputs acceleration A. Based on the engine speed R obtained in step 2, the search module receives the engine speed R, runs the compiled program, and the program calls the inverse function or inverse square function to generate the maximum acceleration signal A. Max .

[0063] Step 4: Based on the driving speed S and engine speed R obtained in step 2, and the acceleration A and maximum acceleration signal A obtained in step 3, Max , the first comparison module compares the driving speed S with the preset maximum driving speed S Max Make a difference and get the comparison signal S Max -S. The second comparison module compares acceleration A with the maximum acceleration A Max Make a difference and get the comparison signal A Max -A. The third comparison module compares the engine speed R with the preset maximum engine speed R Max Make a difference and get the comparison signal R Max -R.

[0064] Step 5: Three comparison signals S obtained in step 4 Max -S, A Max -A, R Max -R, the increment / decrement module receives three comparison signals and determines their signs; when the comparison signal S Max If S is positive, the increment module adds a predetermined amount dP to the accelerator pedal input signal P 1 , to generate a pedal limit signal P according to the driving speed Lims ; When the comparison signal S Max -S is negative, the decrement module inputs the signal P from the accelerator pedal 1 The predetermined amount dP is subtracted from the value to generate a pedal limit signal P according to the driving speed. Lims .

[0065] When the comparison signal A Max -A is positive, the increment module adds a predetermined amount dP to the accelerator pedal input signal P 1 To generate a pedal limit signal P according to acceleration LimA When the comparison signal A Max -A is negative, the decrement module receives the accelerator pedal input signal P 1 The predetermined amount dP is subtracted from the acceleration to generate a pedal limit signal P according to the acceleration. LimA .

[0066] When the comparison signal R Max -R is positive, the increment module adds a predetermined amount dP to the accelerator pedal input signal P 1, to generate a pedal limit signal P according to the engine speed LimR When the comparison signal R Max -R is negative, the decrement module receives the accelerator pedal input signal P 1 The predetermined amount dP is subtracted from the value to generate a pedal limit signal P according to the engine speed. LimR .

[0067] After the above steps, the pedal limit signal P according to the acceleration is obtained. LimA , Pedal limit signal P according to engine speed LimR and the pedal limit signal P according to the driving speed Lims .

[0068] Step 6: Minimize the pedal limit signal P obtained in step 5 based on the acceleration LimA、 Pedal limit signal P according to engine speed LimR and the pedal limit signal P according to the driving speed Lims With the accelerator pedal input signal P 1 Perform a comparison operation and output the minimum value, which is the final output accelerator pedal signal P 2 .

[0069] The electronic control unit on the vehicle receives the output accelerator pedal signal P obtained in step 6 2 , and according to the output accelerator pedal signal P 2 Automatically control and adjust the output of the accelerator pedal so that the output accelerator pedal signal P 2 As a new accelerator pedal input signal, and continuously repeat steps 1 to 6, so that the accelerator pedal input signal of the vehicle is always at a minimum value, thereby achieving the purpose of improving fuel economy.

[0070] Further, the fuel control unit is connected in series between the vehicle's stop / start switch and the electronic control unit, and a switch control module is arranged inside the fuel control unit. The fuel control unit also receives signals from the gear selector sensor, the clutch pedal sensor, the ambient temperature sensor and the engine temperature sensor. When the driving speed signal S indicates that the vehicle is stationary within a preset time, and the engine speed signal R indicates that the engine speed is lower than a preset threshold, and the signal of the gear selector sensor indicates that the gearbox is in neutral, and the signal of the engine temperature sensor indicates that the engine temperature is lower than a preset minimum temperature threshold, and the signal of the ambient temperature sensor indicates that the ambient temperature is higher than a preset maximum threshold or lower than a preset minimum threshold, the switch control module inside the fuel control unit ignores the input stop / start switch signal X, generates a stop / start signal X' and sends it to the electronic control unit, and the electronic control unit stops the engine; when the signal of the stop / start switch indicates that the driver wants to start the engine, or the signal of the clutch pedal sensor indicates that the driver has stepped on the clutch, or the driving speed signal S indicates that the vehicle has started to move, or the accelerator pedal input signal P 1 Indicates that the driver has stepped on the accelerator pedal, the switch control module generates a stop / start signal Q and sends it to the electronic control unit, and the electronic control unit starts the engine.

[0071] Further, the device also includes a stop / start override switch, which is connected to the fuel control unit. When the stop / start override switch is operated, the fuel control unit stops / starts. The device also includes a unit override switch, which is connected to the fuel control unit. When the unit override switch is operated, the fuel control unit directly outputs the accelerator pedal input signal P 1 In addition, the device also includes a cruise control switch, which is connected to the fuel control unit. When the cruise control switch is operated, the fuel control unit stores the value of the current driving speed signal S and then changes the output accelerator pedal signal P. 2 , so that the output accelerator pedal signal P 2 Maintain the set value in cruise mode.

[0072] Furthermore, the device also includes a status indicator, such as one or more LED screens, which is connected to the fuel control unit and can indicate to the vehicle driver that the fuel control unit is limiting the vehicle's speed, acceleration or engine speed.

[0073] Furthermore, the fuel control unit is also provided with a USB interface, a GPS module, and a GSM module. The USB interface is used to connect to an external device so as to update the program and change the constants and the lookup table. The GPS module is used to locate the vehicle so as to report the vehicle position through the GSM module. The GSM module is used to send and receive instructions so as to remotely change the constants and the lookup table and remotely control the vehicle. For example, when the GPS module shows an abnormal position, the GSM module sends a command to the fuel control unit to disable the accelerator pedal output P of the electronic control unit. 2 to remotely disable the vehicle in the event of a theft.

[0074] An emergency processing module is also provided in the memory of the fuel control unit. The emergency processing module collects signals from the GPS module and the GSM module and sends them to the core processor. The core processor processes the information and performs corresponding operations.

[0075] The above-mentioned fuel control unit can be installed on the vehicle during manufacturing, or reinstalled after the vehicle is manufactured, without any modification to the electronic control unit. The fuel control unit can also be installed on engines for other purposes. The present invention is envisaged for use in internal combustion engine vehicles, and can also be used on electric vehicles, and the present invention is not limited to use on vehicles. In this article, it is agreed that the term "engine" includes not only internal combustion engines but also electric motors, and the term "fuel" includes not only fuel but also electricity.

[0076] Embodiments of the invention have been described above purely by way of example, and numerous other modifications and developments are possible within the scope of the invention.

Claims

1. A method for improving engine fuel economy, characterized in that: The method is applicable to two different scenarios: a vehicle free driving mode and a threshold preset mode. When the vehicle is in the free driving mode, the method includes the following steps: Step 1: read multiple sensor information through the electronic control unit on the vehicle, the accelerator pedal sensor detects the accelerator pedal stroke or angle position to obtain the accelerator pedal input signal P1; the engine speed sensor obtains the crankshaft position signal E by measuring the engine speed; the drive shaft position sensor obtains the drive shaft position signal D by measuring the drive shaft angle; Step 2: According to the accelerator pedal input signal P1 obtained in step 1, the frequency of the drive shaft position signal D is detected to obtain the vehicle's running speed S, and the crankshaft position signal E is detected to obtain the engine speed R; Step 3: Perform dS / dt operation on the driving speed S obtained in step 2 to obtain acceleration A; call the inverse function or inverse square function on the engine speed R obtained in step 2 to obtain the maximum acceleration signal A Max ; Step 4: The maximum acceleration signal A obtained in step 3 Max Subtract the acceleration A to get the comparison signal A Max -A; Step 5: Comparison signal A obtained in step 4 Max -A, according to its positive or negative sign, determines whether to increase or decrease the accelerator pedal input signal P1 by a predetermined amount dP or a predetermined amount dP. Max -A is positive, and the input accelerator pedal signal P1 is increased by a predetermined amount dP to generate a pedal limit signal P LimA ; when A Max -A is negative, the accelerator pedal input signal P1 is incremented by a predetermined amount dP, generating a pedal limit signal P LimA ; Step 6: Convert the pedal limit signal P obtained in step 5 LimA Compare the magnitude with the accelerator pedal input signal P1 and output a smaller value, which is the final output accelerator pedal signal P2; When the vehicle is in a threshold preset mode, the method comprises the following steps: Step 1: read multiple sensor information through the electronic control unit on the vehicle, the accelerator pedal sensor detects the accelerator pedal stroke or angle position to obtain the accelerator pedal input signal P1; the engine speed sensor obtains the crankshaft position signal E by measuring the engine speed; the drive shaft position sensor obtains the drive shaft position signal D by measuring the drive shaft angle; Step 2: According to the accelerator pedal input signal P1 obtained in step 1, the frequency of the drive shaft position signal D is detected to obtain the vehicle's running speed S, and the crankshaft position signal E is detected to obtain the engine speed R; Step 3: Perform dS / dt operation on the driving speed S obtained in step 2 to obtain acceleration A; call the inverse function or inverse square function on the engine speed R obtained in step 2 to obtain the maximum acceleration signal A Max ; Step 4: The driving speed S and engine speed R obtained in step 2, as well as the acceleration A and the maximum acceleration signal A obtained in step 3 are calculated. Max , and the preset maximum driving speed S Max , preset maximum engine speed R Max The corresponding difference is obtained to obtain the comparison signal S Max -S, A Max -A, R Max -R; Step 5: Three comparison signals S obtained in step 4 Max -S, A Max -A, R Max -R, according to its positive or negative sign, determines whether to increase or decrease the accelerator pedal input signal P1 by a predetermined amount dP; when the comparison signal S Max -S is positive, the accelerator pedal input signal P1 is incremented by a predetermined amount dP to generate a pedal limit signal P according to the driving speed. Lims ; When the comparison signal S Max If -S is negative, the accelerator pedal input signal P1 is decreased by a predetermined amount dP to generate a pedal limit signal P according to the driving speed. Lims ; When the comparison signal A Max -A is positive, the accelerator pedal input signal P1 is incremented by a predetermined amount dP to generate a pedal limit signal P according to acceleration. LimA ; When the comparison signal A Max -A is negative, the accelerator pedal input signal P1 is decremented by a predetermined amount dP to generate a pedal limit signal P according to the acceleration. LimA ; When the comparison signal R Max If R is positive, the accelerator pedal input signal P1 is incremented by a predetermined amount dP1 to generate a pedal limit signal P according to the engine speed. LimR ; When the comparison signal R Max If -R is negative, the accelerator pedal input signal P1 is decreased by a predetermined amount dP to generate a pedal limit signal P according to the engine speed. LimR ; Step 6: The pedal limit signal P obtained in step 5 based on the acceleration LimA、 Pedal limit signal P according to engine speed LimR and the pedal limit signal P according to the driving speed Lims Compare the magnitude with the accelerator pedal input signal P1 and output the minimum value, which is the final output accelerator pedal signal P2; The electronic control unit on the vehicle receives the output accelerator pedal signal P2 obtained in step six, and automatically controls the output of the accelerator pedal according to the output accelerator pedal signal P2, adjusts the output of the accelerator pedal, and makes the output accelerator pedal signal P2 serve as the new accelerator pedal input signal, and continuously repeats steps one to six, so that the accelerator pedal input signal of the vehicle is always at a minimum value.

2. A device for improving engine fuel economy, characterized in that: The device is used to implement the method for improving the fuel economy of an engine as claimed in claim 1; the device includes a fuel control unit, the fuel control unit includes a GPS module, a GSM module, a USB interface, a core processor and a memory, the core processor model is MPC5675K, and the GPS module model is VK2828U8G5L; the fuel control unit is connected to the engine crankshaft position sensor, the drive shaft position sensor, the accelerator pedal sensor and the electronic control unit; the memory has built-in detection module, differential module, search module, comparison module, increment / decrement module, and minimization module; the detection module mainly executes receiving accelerator pedal signal, crankshaft position sensor, accelerator pedal position sensor, and accelerator pedal position sensor. The shaft position signal and drive shaft position signal functions convert the signals into driving speed and engine speed and output them to the differential module and search module respectively; the differential module receives the driving speed and executes the dS / dt function to output the acceleration; the search module receives the engine speed and runs the compiled program to obtain the maximum acceleration signal; the comparison module determines the sign of the difference between the threshold and the instantaneous value; if it is positive, the increment module is executed, and if it is negative, the decrement module is executed to obtain the pedal limit signal; the minimization module receives the accelerator pedal input signal and the pedal limit signal, and outputs the minimum value to the electronic control unit, which is used as the final accelerator pedal signal to regulate the vehicle's power system; The memory implements the settings of the detection module, the differentiation module, the search module, the comparison module, the increment / decrement module, and the minimization module through at least one instruction, at least one program, the code set, or the instruction set. The at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the core processor to implement the method for improving engine fuel economy as described in claim 1.

3. A device for improving engine fuel economy according to claim 2, characterized in that: The fuel control unit is connected in series between the stop / start switch of the vehicle and the electronic control unit, and a switch control module is arranged inside the fuel control unit. The fuel control unit also receives signals from the gear selector sensor, the clutch pedal sensor, the ambient temperature sensor and the engine temperature sensor. When the driving speed signal S indicates that the vehicle is stationary within a preset time, and the engine speed signal R indicates that the engine speed is lower than the preset threshold, and the signal of the gear selector sensor indicates that the gearbox is in neutral, and the signal of the engine temperature sensor indicates that the engine temperature is lower than the preset minimum temperature threshold, and the signal of the ambient temperature sensor indicates that the ambient temperature is higher than the preset maximum threshold or lower than the preset minimum threshold, the switch control module inside the fuel control unit generates a stop / start signal X' and sends it to the electronic control unit, and the electronic control unit stops the engine; when the signal of the stop / start switch indicates that the driver wants to start the engine, or the signal of the clutch pedal sensor indicates that the driver has stepped on the clutch, or the driving speed signal S indicates that the vehicle has started to move, or the accelerator pedal input signal P1 indicates that the driver has stepped on the accelerator pedal, the switch control module generates a stop / start signal Q and sends it to the electronic control unit, and the electronic control unit starts the engine.

4. A device for improving engine fuel economy according to claim 2, characterized in that: The device also includes a stop / start override switch, which is connected to the fuel control unit; when the stop / start override switch is operated, the fuel control unit stops / starts.

5. A device for improving engine fuel economy according to claim 2, characterized in that: The device also includes a unit override switch, which is connected to the fuel control unit. When the unit override switch is operated, the fuel control unit directly outputs the accelerator pedal input signal P1 to the electronic control unit.

6. A device for improving engine fuel economy according to claim 2, characterized in that: The device also includes a cruise control switch, which is connected to a fuel control unit. When the cruise control switch is operated, the fuel control unit stores the value of the current driving speed signal S and then changes the output accelerator pedal signal P2 so that the output accelerator pedal signal P2 remains at a set value in the cruise mode.

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