CN103993967A - Vehicle and quick acceleration control method and device for vehicle - Google Patents

Abstract

The invention discloses a method for controlling rapid acceleration of a vehicle, which comprises the following steps: judging whether the engine is in a rapid acceleration working condition; entering a rapid acceleration waiting mode under the condition that the judgment result indicates that the engine is in the rapid acceleration working condition; In the waiting mode, the opening of the accelerator pedal and the acceleration rate are both greater than the corresponding threshold, and the rapid acceleration activation mode is entered; in the rapid acceleration activation mode, the output control command reduces the engine operation limit; Bit or engine failure as the condition, exit the rapid acceleration condition. By applying the control method provided by this scheme, the vehicle can be accelerated by adjusting the working state of the engine under the rapid acceleration condition, thereby improving its acceleration performance while taking into account the economy. On this basis, the present invention also provides a vehicle applying the rapid acceleration control method.

Description

Vehicle and rapid acceleration control method and device thereof

technical field

The invention relates to the control technology of a vehicle engine, in particular to a vehicle and its rapid acceleration control method and device.

Background technique

Acceleration performance is an important indicator to measure the dynamic performance of a vehicle. The shorter the acceleration time required for the engine to drive the car to a certain high speed, the better its acceleration performance and the higher the power of the vehicle; that is to say, the acceleration performance of the vehicle is mainly determined by the power of the engine Generally, the greater the power of the engine, the better the acceleration performance of the vehicle.

In the process of vehicle matching, it is necessary to match the engine with factors such as power and economy. As we all know, based on the current engine operation control, only by increasing the fuel injection volume can not run in the best working state, the fuel economy is not high, and the acceleration performance effect is not obvious. Apparently, power and economy are often contradictions that restrict each other in the matching process. To improve power, economy must be sacrificed, and to improve economy, power must be sacrificed. Especially, the above-mentioned contradiction is particularly prominent in the rapid acceleration working mode of the engine.

In view of this, it is urgent to propose a control method for the rapid acceleration mode of the engine. Through the optimization of the control technology, the acceleration performance can be improved under the premise of taking into account the economy.

Contents of the invention

In view of the above-mentioned defects, the technical problem to be solved by the present invention is to provide a rapid acceleration control method of the vehicle, which can complete the acceleration of the vehicle by adjusting the working state of the engine under the rapid acceleration condition, so as to improve its acceleration performance under the premise of taking into account the economy. On this basis, the present invention also provides a vehicle applying the rapid acceleration control method.

The vehicle rapid acceleration control method provided by the present invention comprises the following steps:

A10. Determine whether the engine is in a rapid acceleration condition;

A21. Enter the rapid acceleration waiting mode on the condition that the judgment result indicates that it is in the rapid acceleration working condition;

A22. In the rapid acceleration waiting mode, enter the rapid acceleration activation mode under the condition that the accelerator pedal opening and the acceleration rate are greater than the corresponding threshold;

A23. In the rapid acceleration activation mode, the output control command lowers the engine operating limit;

A30. If the vehicle speed is greater than the threshold, in neutral position or engine failure, exit the rapid acceleration condition.

Preferably, in step A23, a control command is simultaneously output to adjust the fuel injection advance angle and the set value of the rail pressure, and to increase the driving demand torque.

Preferably, in step A23, the rapid acceleration sleep mode is entered on the condition that the time for entering the rapid acceleration activation mode exceeds a threshold;

Step A24. In the rapid acceleration sleep mode, enter the rapid acceleration waiting mode on the condition that the time for entering the rapid acceleration sleep mode exceeds a threshold.

Preferably, in step A23, after the control command is output, the rapid acceleration waiting mode is entered on the condition that the opening of the accelerator pedal is smaller than the threshold.

Preferably, RAMP slope control is adopted after exiting the rapid acceleration condition.

Preferably, in step A10, according to the condition that the rapid acceleration enable flag, the vehicle speed, the engine speed, the water temperature and the intake air temperature are all greater than the corresponding thresholds, the judgment result of being in the rapid acceleration condition is obtained.

Preferably, said reducing the engine operation limit includes: relaxing the smoke limit, relaxing the mechanical protection torque limit, relaxing the overheating protection, relaxing the supercharger limit torque protection and the engine speed torque limit.

Preferably, said increasing the driving demand torque is specifically increasing the torque change slope on the basis of the pedal demand torque.

The vehicle provided by the present invention includes a driving engine, and adopts the vehicle rapid acceleration control method as described above.

Compared with the prior art, the present invention takes a new approach and provides a rapid acceleration control method for vehicles. First of all, this program starts the rapid acceleration mode based on the rapid acceleration condition, and enters the rapid acceleration waiting mode; when the accelerator pedal opening and acceleration rate are both greater than the corresponding threshold, it enters the rapid acceleration activation mode, and the output control command reduces the engine running. Limit, so as to achieve the purpose of improving the rapid acceleration performance of the vehicle within the allowable range of the engine; finally, exit the rapid acceleration condition when the vehicle speed is greater than the threshold, in neutral or engine failure. By applying the rapid acceleration control method of the present invention, the calibration of the rapid acceleration mode can be released, and various restrictions can be appropriately released in a short period of time, so that the requirements of different customers can be met; the control method can ensure The acceleration performance of the vehicle is significantly improved.

In the preferred solution of the present invention, in the rapid acceleration activation mode, while the output control command reduces the engine operation limit, it also outputs the control command to adjust the fuel injection advance angle and the rail pressure setting value, and increase the driving demand torque; thus, it can Further improve the vehicle's rapid acceleration performance.

In another preferred solution of the present invention, enter the rapid acceleration sleep mode on the condition that the time to enter the rapid acceleration activation mode exceeds the threshold, and enter the rapid acceleration waiting mode on the condition that the time to enter the rapid acceleration sleep mode exceeds the threshold; The setting is to control the time that the engine continuously works in the rapid acceleration mode, so as to improve the rapid acceleration performance of the vehicle, and completely avoid the safety hazards of the implementation of this control method.

In yet another preferred solution of the present invention, the RAMP slope control is adopted after exiting the rapid acceleration condition, so that the working stability of the engine after rapid acceleration can be obtained.

The rapid acceleration control method provided by the present invention is applicable to any vehicle using a driving engine.

Description of drawings

Fig. 1 is a flow chart of the rapid acceleration control method described in the first embodiment;

Fig. 2 is a flow chart of the rapid acceleration control method described in the second embodiment.

Detailed ways

Based on the conventional control of the engine of the existing vehicle, the core of the present invention is to provide a rapid acceleration control method to improve its acceleration performance under the premise of taking economical into account. The present embodiment will be described in detail below in conjunction with the accompanying drawings.

Example 1:

Please refer to FIG. 1 , which is a flow chart of the rapid acceleration control method described in the first embodiment.

The vehicle rapid acceleration control method includes the following steps:

A10. Judging whether the engine is in a rapid acceleration condition; specifically, according to the condition that the rapid acceleration enable flag, vehicle speed, engine speed, water temperature and intake air temperature are all greater than the corresponding threshold, the judgment result of the rapid acceleration condition is obtained. Here, according to different application occasions, corresponding thresholds of the rapid acceleration enabling flag, vehicle speed, engine speed, water temperature and intake air temperature can be determined through experiments.

A21. With the judgment result indicating that the vehicle is in the rapid acceleration condition as condition 0, enter the rapid acceleration waiting mode; that is, rapid acceleration control is not performed in this mode, and the judgment result indicates whether the vehicle can perform rapid acceleration control.

A22. In the rapid acceleration waiting mode, the opening of the accelerator pedal is greater than the first threshold and the acceleration rate is greater than a certain threshold as condition 2, and enters the rapid acceleration activation mode; when the opening of the accelerator pedal and the acceleration rate are greater than a certain value (requires the driver When stepping on the accelerator suddenly), enter the rapid acceleration activation mode to perform rapid acceleration control.

A23. In the rapid acceleration activation mode, the output control command lowers the engine operating limit; of course, after the control command is output, the accelerator pedal opening is less than the second threshold as the condition 1, enters the rapid acceleration waiting mode, and then switches back from the rapid acceleration mode The rapid acceleration waiting mode ensures that the rapid acceleration control is consistent with the driver's operation instructions in time, and has good operability.

A30. If the vehicle speed is greater than the threshold, in neutral or engine failure is condition 4, exit the rapid acceleration condition. Obviously, the vehicle speed "threshold" here needs to consider both the speed requirement for rapid acceleration and the safe working limit of the engine. It should be understood that this "threshold" is greater than the vehicle speed "threshold" in step A10. In order to obtain better operating safety of the engine and the whole machine, when the operating gear is switched to the neutral position or the engine fails and an error is reported, it is also necessary to exit the rapid acceleration mode, that is, the non-acceleration mode.

It should be noted that the engine operation limit is determined according to the conventional engine ECU control. In this paper, "reducing the engine operation limit" refers to adjusting the engine safety operation limit so that the value of the limit parameter is temporarily increased under the rapid acceleration condition. Preferably, reducing the engine operating limit may include: relaxing the smoke limit, relaxing the mechanical protection torque limit, relaxing the overheat protection, relaxing the supercharger limit torque protection and the engine speed torque limit. Among them, relax the smoke limit: the original smoke limit torque is relatively small, and the smoke limit torque cannot keep up with the sudden need for torque, so the limit torque obtained based on the intake pressure needs to be released temporarily. Among them, relax the overheating protection: when the torque is suddenly needed, the engine water temperature will rise faster. The conventional engine overheating protection is calibrated for long-term operation. Therefore, temporary overheating can be properly enlarged, but some situations still need to be considered Yes, such as boiling the pot and so on. Among them, turbocharger limit torque protection, engine speed torque limit: the original torque limit is relatively small, and if the smoke limit torque and overheat protection limit torque do not work when the torque is suddenly needed, this part of the torque will be To work, take the minimum value of the two, so it is also necessary to increase the limit torque. It should be understood that, for different types of engines, there are certain differences in the operating restrictions in their conventional control, and they are not restricted by the aforementioned restriction types.

In order to further improve the rapid acceleration performance, minimize the acceleration time. In step A23, a control command is simultaneously output to adjust the fuel injection advance angle and the set value of the rail pressure, and to increase the driving demand torque. Among them, increasing the demand torque: the pedal demand torque increases the torque change slope on the original basis. Among them, adjusting the torque limit: amplify the engine limit torque on the original basis. Among them, adjusting the fuel injection advance angle and adjusting the rail pressure setting value: the fuel injection advance angle tends to increase, and the rail pressure setting value also tends to increase. Of course, the increase adjustment can not be made for special control points.

Obviously, the engine speed in the rapid acceleration activation mode is higher than the engine speed under the conventional control. In order to obtain the stability of the engine after rapid acceleration, it is preferable to use the RAMP slope control after exiting the rapid acceleration mode.

In addition, in order to further improve the safety and reliability of the application of the rapid acceleration performance control method, further optimization can be made on the basis of the first embodiment. Please also refer to FIG. 2, which shows the rapid acceleration described in the second embodiment. Flowchart of the performance control method.

Example 2:

The control principle of this solution is exactly the same as that of the first embodiment, the difference is that the function of controlling the time for the engine to continuously work in the rapid acceleration activation mode is added. As shown in Figure 2, in step A23, with the time of entering the rapid acceleration activation mode exceeding the first time threshold as condition 3, enter the rapid acceleration dormancy mode; Step A24. In the rapid acceleration dormancy mode, enter the time of the rapid acceleration dormancy mode Exceeding the second time threshold is condition 4, entering the rapid acceleration waiting mode, and entering the rapid acceleration activation mode again when the rapid acceleration condition is met. Similarly, the "first time threshold" and "first time threshold" can also be calibrated through experiments.

In addition to the foregoing rapid acceleration control method for the vehicle, this embodiment also provides a vehicle using a driving engine. On the basis of conventional ECU engine control, the vehicle applies the foregoing rapid acceleration control method. What needs to be clarified is that other functional components of the vehicle can be implemented using existing technologies, so this article will not repeat them here.

The above is only a preferred embodiment of the present invention, it should be pointed out that, for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made, and these improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (9)

1. A method for controlling rapid acceleration of a vehicle, characterized in that the method for controlling comprises the following steps: A10. Determine whether the engine is in a rapid acceleration condition; A21. Enter the rapid acceleration waiting mode on the condition that the judgment result indicates that it is in the rapid acceleration working condition; A22. In the rapid acceleration waiting mode, enter the rapid acceleration activation mode under the condition that the accelerator pedal opening and the acceleration rate are greater than the corresponding threshold; A23. In the rapid acceleration activation mode, the output control command lowers the engine operating limit; A30. If the vehicle speed is greater than the threshold, in neutral position or engine failure, exit the rapid acceleration condition. 2. The vehicle rapid acceleration control method according to claim 1, characterized in that, in step A23, a control command is simultaneously output to adjust the fuel injection advance angle and the rail pressure set value, and to increase the driving demand torque. 3. The vehicle rapid acceleration control method according to claim 2, characterized in that, in step A23, the rapid acceleration dormancy mode is entered on the condition that the time for entering the rapid acceleration activation mode exceeds a threshold; Step A24. In the rapid acceleration sleep mode, enter the rapid acceleration waiting mode on the condition that the time for entering the rapid acceleration sleep mode exceeds a threshold. 4. The vehicle rapid acceleration control method according to any one of claims 1 to 3, characterized in that, in step A23, after the control command is output, the accelerator pedal opening is smaller than a threshold as a condition, and enters the rapid acceleration waiting model. 5 . The method for controlling rapid acceleration of the vehicle according to claim 4 , wherein the ramp control is adopted after exiting the rapid acceleration working condition. 6 . 6. The vehicle rapid acceleration control method according to claim 1, characterized in that, in step A10, according to the condition that the rapid acceleration enable flag, vehicle speed, engine speed, water temperature and intake air temperature are all greater than the corresponding threshold value, the vehicle in rapid acceleration is obtained. Judgment result of accelerated working condition. 7. The vehicle rapid acceleration control method according to claim 1, wherein said reducing the engine operation limit comprises: relaxing the smoke limit, relaxing the mechanical protection torque limit, relaxing the overheating protection, relaxing the supercharger limit torque protection and Engine speed torque limit. 8. The method for controlling sudden acceleration of the vehicle according to claim 7, wherein said increasing the driving demand torque is specifically increasing the torque change slope on the basis of the pedal demand torque. 9. A vehicle, comprising a driving engine, characterized in that the vehicle rapid acceleration control method according to any one of claims 1 to 8 is adopted.