A diesel engine vehicle driving assistance control method

Abstract

This invention provides a driving assistance control method for diesel engine vehicles, comprising: a starting phase control method: when the vehicle controller detects that the vehicle is not in neutral and the clutch is depressed, after the brake is released, the vehicle controller will control the engine speed to increase by a certain amount; a shifting phase control method: based on changes in the clutch status signal and the ratio of engine speed to vehicle speed, the vehicle controller determines whether the driver has completed an upshift or downshift operation, and then controls the engine speed to increase or decrease accordingly. This invention is well applicable to the auxiliary control of diesel engine vehicles during the starting and shifting phases, effectively improving the power and smoothness of manual transmission diesel engine vehicles during these phases.

Description

Technical Field

[0001] This invention belongs to the field of diesel engine vehicle control technology, and specifically relates to a driving assistance control method for diesel engine vehicles. Background Technology

[0002] As automotive technology becomes increasingly advanced, drivers' demands for the driving experience are also rising. This places higher demands on the power and smoothness of the vehicle during start-up and gear shifting. Current driver assistance control methods for start-up and gear shifting are typically used in gasoline-powered vehicles. However, the control methods for diesel-powered vehicles differ because diesel engines use an excess air coefficient, and the throttle opening is not correlated with the accelerator pedal. Furthermore, diesel engines use compression ignition, without ignition coils. Additionally, diesel engines are mostly used in trucks, especially when fully loaded, where the vehicle's weight is greater and requires more torque during start-up, making them unsuitable for diesel-powered vehicles.

[0003] Therefore, how to design a driving assistance control method for diesel engine vehicles that can be better applied to the auxiliary control of diesel engine vehicles during the starting and shifting stages, and improve the power and smoothness of manual transmission diesel engine vehicles during the starting and shifting stages, has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] The purpose of this invention is to provide a driving assistance control method for diesel engine vehicles to solve the above-mentioned technical problems in the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A diesel engine vehicle driving assistance control method includes: a start-up phase control method: when the vehicle controller detects that the vehicle is not in neutral and the clutch is depressed, after the brake is released, the vehicle controller will control the engine speed to increase by a certain amount;

[0007] Shift phase control method: The vehicle controller determines whether the driver has completed the upshift or downshift operation based on the changes in the clutch status signal and the ratio of engine speed to vehicle speed. Then, the vehicle controller controls the engine speed to increase or decrease.

[0008] Preferably, in the shift phase control method, when the clutch is in the default state of disengagement, when the clutch status signal indicates that the clutch has changed from disengagement to engagement and then back to disengagement, the driver determines whether the shifting operation has been completed based on the change in the ratio of engine speed to vehicle speed.

[0009] Preferably, when the clutch status signal indicates that the clutch has gone from disengaged to engaged and then back to disengaged, if the ratio of engine speed to vehicle speed increases, the vehicle controller reduces the engine speed; if the ratio of engine speed to vehicle speed decreases, the vehicle controller increases the engine speed.

[0010] Preferably, in the starting phase control method, the specific content of the vehicle controller controlling the engine speed to increase by a certain amount is: increasing it by 245 rpm-255 rpm from the current idle speed of the vehicle.

[0011] Preferably, the current idle speed is divided into normal idle speed and idle speed when the air conditioner is on.

[0012] Preferably, the start-up control method further includes a torque control method, wherein the torque control method specifically comprises:

[0013] During the start-up process, if the vehicle controller detects that the vehicle's starting resistance is too high, the vehicle controller will increase the engine torque by controlling the engine's fuel injection quantity, intake air quantity, and fuel injection timing.

[0014] Preferably, the starting resistance of the vehicle is judged by the throttle opening and the vehicle acceleration.

[0015] Preferably, the specific method for determining whether the vehicle's starting resistance is too high is as follows:

[0016] When the throttle opening is greater than the set opening value, the vehicle speed is greater than 0 but less than the set speed value, and the acceleration is less than the set acceleration value, it is determined that the vehicle's starting resistance is too high. Then, the vehicle controller increases the fuel injection quantity, increases the intake air volume, and controls the fuel injection timing to advance, thereby increasing the engine torque.

[0017] The beneficial effects of this invention are as follows:

[0018] The diesel engine vehicle driving assistance control method of the present invention uses the vehicle controller to determine the driver's starting intention and shifting intention, and then controls the engine speed in real time to automatically adjust to the required target. Therefore, it can be well applied to the auxiliary control of diesel engine vehicles in the starting and shifting stages, and can effectively improve the power and smoothness of manual transmission diesel engine vehicles in the starting and shifting stages. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly described below, and the specific embodiments of the present invention will be further described in detail with reference to the drawings, wherein...

[0020] Figure 1 This is a schematic diagram of the start-up phase control method provided in an embodiment of the present invention. Detailed Implementation

[0021] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0022] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0023] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0024] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0025] like Figure 1 As shown, this embodiment of the invention provides a driving assistance control method for diesel engine vehicles, which includes: a starting phase control method: when the vehicle controller monitors that the vehicle is not in neutral and the clutch is depressed, and the brake is released, it indicates that the driver has the intention to start, and the vehicle controller will control the engine speed to increase by a certain amount;

[0026] Shift phase control method: The vehicle controller determines whether the driver has completed the upshift or downshift operation based on the changes in the clutch status signal and the ratio of engine speed to vehicle speed. Then, the vehicle controller controls the engine speed to increase or decrease.

[0027] Furthermore, in the shift phase control method, when the clutch is in the default state of disengagement, when the clutch status signal indicates that the clutch has changed from disengagement to engagement and then back to disengagement, the driver determines whether the shift has been completed based on the change in the ratio of engine speed to vehicle speed.

[0028] Specifically, when the clutch status signal indicates that the clutch has gone from disengaged to engaged and then back to disengaged, if the ratio of engine speed to vehicle speed increases, it indicates that a downshift operation has been completed. In this case, the vehicle controller reduces the engine speed to reach the required target value. If the ratio of engine speed to vehicle speed decreases, it indicates that an upshift operation has been completed. In this case, the vehicle controller increases the engine speed to reach the required target value, thus enabling smooth gear shifting.

[0029] Furthermore, the specific content of the vehicle controller controlling the engine speed to increase by a certain amount in the start-up phase control method is as follows: increase the engine speed by 245 rpm-255 rpm at the current idle speed of the vehicle, preferably 250 rpm.

[0030] Specifically, the current idle speed is divided into normal idle speed and idle speed when the air conditioner is on. It can be understood that the normal idle speed is 750 rpm, and the idle speed when the air conditioner is on is 950 rpm.

[0031] Furthermore, the start-up control method also includes a torque control method, which specifically includes:

[0032] During the start-up process, if the vehicle controller detects that the vehicle's starting resistance is too high, the vehicle controller will increase the engine torque by controlling the engine's fuel injection quantity, intake air quantity, and fuel injection timing.

[0033] It is preferable to judge whether the vehicle's starting resistance is too high by measuring the throttle opening and vehicle acceleration.

[0034] Specifically, the method for determining whether the vehicle's starting resistance is too high is as follows:

[0035] When the throttle opening is greater than the set opening value, the vehicle speed is greater than 0 but less than the set speed value, and the acceleration is less than the set acceleration value, it is determined that the vehicle's starting resistance is too high, that is, the vehicle is too heavy or going uphill. Then the vehicle controller increases the fuel injection quantity, increases the air intake quantity, and controls the fuel injection timing to advance, thereby increasing the engine torque to reach the target value, so that the vehicle can start.

[0036] In a specific embodiment, the set opening value can preferably be 5% throttle opening. Different set opening values ​​can be set when matching different vehicles, which needs to be determined according to the actual calibration conditions. The set speed value can preferably be 5 km / h. The adjustment amount of fuel injection quantity, intake air quantity, fuel injection timing, and set acceleration value can be set according to the actual vehicle calibration conditions. It is understood that the target values ​​that the engine speed and engine torque need to achieve after adjustment in the above control method can be set according to the actual vehicle calibration conditions.

[0037] The diesel vehicle driving assistance control method provided in this invention can be applied to diesel vehicles without the need for additional gear position sensors. It uses neutral switch signals, clutch status signals, engine speed signals, vehicle speed signals, air conditioning signals, and brake signals as identification conditions. The vehicle controller can determine the driver's starting and shifting intentions through these signals and then make corresponding speed adjustments. At the same time, during the starting process, this invention can also increase torque by controlling the fuel injection quantity, intake air quantity, and fuel injection timing without needing to press the accelerator pedal.

[0038] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A driving assistance control method for diesel engine vehicles, characterized in that, It includes: Starting phase control method: When the vehicle controller detects that the vehicle is not in neutral, and When the clutch is depressed and the brake is released, the vehicle controller will control the engine speed to increase by a certain amount. Shift phase control method: The vehicle controller determines whether the driver has completed the upshift or downshift operation based on the changes in the clutch status signal and the ratio of engine speed to vehicle speed, and then controls the engine speed to increase or decrease. In the shift phase control method, when the default state of the clutch is disengaged, when the clutch status signal indicates that the clutch has changed from disengaged to engaged and then back to disengaged, the driver determines whether the upshift or downshift operation has been completed based on the change in the ratio of engine speed to vehicle speed. When the clutch status signal indicates that the clutch has gone from disengaged to engaged and then back to disengaged, if the ratio of engine speed to vehicle speed increases, the vehicle controller will reduce the engine speed; if the ratio of engine speed to vehicle speed decreases, the vehicle controller will increase the engine speed. The initial control method also includes a torque control method, which specifically includes: During the start-up process, if the vehicle controller detects that the vehicle's starting resistance is too high, the vehicle controller will increase the engine torque by controlling the engine's fuel injection quantity, intake air quantity, and fuel injection timing. Judge whether the vehicle's starting resistance is too high by measuring the throttle opening and vehicle acceleration; The specific method for determining whether the vehicle's starting resistance is too high is as follows: When the throttle opening is greater than the set opening value, the vehicle speed is greater than 0 but less than the set speed value, and the acceleration is less than the set acceleration value, it is determined that the vehicle's starting resistance is too high. Then, the vehicle controller increases the fuel injection quantity, increases the intake air volume, and controls the fuel injection timing to advance, thereby increasing the engine torque.

2. The diesel engine vehicle driving assistance control method according to claim 1, characterized in that, The specific content of the vehicle controller controlling the engine speed to increase by a certain amount in the start-up phase control method is as follows: increase the engine speed by 245 rpm-255 rpm from the current idle speed of the vehicle.

3. The diesel engine vehicle driving assistance control method according to claim 2, characterized in that, The current idle speed is divided into normal idle speed and idle speed when the air conditioner is on.

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