CN114940154A - Hybrid electric vehicle launch starting control method - Google Patents

Abstract

A hybrid electric vehicle launch start control method comprises launch start enabling judgment, launch start control, launch start engine rotating speed control, launch start wheel torque control and hybrid electric controller signal interaction control, if a vehicle enters a launch start state after the launch start enabling judgment, launch start is controlled through the launch start control, the rotating speed of an engine is controlled through the launch start engine rotating speed control, wheel torque is controlled through the launch start wheel torque control, and a vehicle control unit VCU performs signal interaction with a motor controller PCU and an engine management system EMS through the hybrid electric controller signal interaction control.

Description

A hybrid electric vehicle launch control method

technical field

The invention relates to the technical field of automobile engines, in particular to a method for controlling the launch of a hybrid electric vehicle.

Background technique

Ejection start is an output platform that uses the gearbox to adjust the engine speed to the maximum torque, so as to realize the moment when the vehicle starts, the engine outputs the maximum torque and achieves the best acceleration. An acceleration technology. If the ejection start is used, the engine can output the maximum torque at the moment when the vehicle starts, and the acceleration is very fast, which can give the user more driving pleasure.

At present, most of the common ejection start control methods on the market are complicated to operate, and may require multiple steps on the pedal, or there is a certain risk of accidental touch. In addition, since the starting process of the engine and motor of the vehicle during the ejection start is different from that of conventional driving, a lot of manual operations and debugging are required, which is time-consuming and labor-intensive.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a method for controlling the launch of a hybrid electric vehicle, which is easy to operate and not easily touched by mistake.

The hybrid electric vehicle launch control method provided by the present invention includes launch start enable judgment, launch launch control, launch engine speed control, launch wheel torque control and hybrid controller signal interaction control. After the start is judged to enter the ejection start state, the ejection start is controlled by the ejection start control, the engine speed is controlled through the ejection start engine speed control, and the wheel edge torque is controlled through the ejection start wheel torque control , the vehicle controller VCU performs signal interaction with the motor controller PCU and the engine management system EMS through the hybrid controller signal interaction control.

Further, the ejection start enabling judgment includes the following steps:

Step S1: determine whether the gear is a forward gear and whether the current vehicle speed is less than the vehicle speed threshold, if the gear is a forward gear and the current vehicle speed is less than the vehicle speed threshold, then go to step S2;

Step S2: Determine whether the ejection start switch of the vehicle is pressed. If the vehicle has the ejection start switch and the ejection start switch is pressed, the ejection start control is entered. If the vehicle has the ejection start switch and the ejection start switch is not pressed, then Enter step S3;

Step S3: Determine whether the accelerator opening is greater than the accelerator opening threshold and whether the brake pedal opening is greater than the brake pedal opening threshold, if the accelerator opening is greater than the accelerator opening threshold and the brake pedal opening is greater than the brake pedal opening threshold , then enter the ejection start control.

Further, in the step S2, if the vehicle does not have an ejection start switch, the process proceeds to step S3.

Further, the ejection start control includes the following steps:

Step S4: Send an instruction to the meter, the meter reminds the user that the ejection start has been turned on, pay attention to safety;

Step S5: control the engine start and load torque, enter the ejection start engine startup control and the ejection start wheel torque control;

Step S6: Determine whether the opening degree of the brake pedal is zero within the first preset time, and if the opening degree of the brake pedal reaches zero at any time point within the first preset time, the vehicle is ejected to start.

Further, in the step S6, the first preset time is a calibration value, and if the opening of the brake pedal does not reach zero within the first preset time, the ejection start and the engine start are canceled.

Further, the ejection start engine start control includes the following steps:

Step S7: the vehicle controller VCU controls the engine to start, and after the engine completes fuel injection and ignition, the vehicle controller VCU controls the engine to run at the first engine speed.

Further, the first engine speed is a calibration value, and its range is between 1200rpm and 3000rpm.

Further, the ejection starting wheel torque control includes the following steps:

Step S8: The vehicle controller VCU calculates the wheel torque demand, obtains the motor torque demand and/or the motor torque demand according to the wheel torque demand, and allocates the wheel torque demand to the engine and/or the motor.

Further, in the step S8, the vehicle controller VCU can look up the table to calculate the wheel torque demand according to the accelerator opening, or use the maximum wheel torque that the system can output as the wheel torque demand.

Further, the signal interaction control of the hybrid controller includes:

The vehicle controller VCU can send a user reminder command to the instrument when the vehicle enters the ejection start state, reminding the user that the ejection start has been turned on, pay attention to safety;

The vehicle controller VCU can send the motor torque demand to the motor controller PCU. After the motor controller PCU receives the motor torque demand, it controls the motor to output the corresponding torque according to the motor torque demand, and feeds back the actual torque of the motor to the vehicle controller. VCU;

The vehicle controller VCU can send the engine torque demand to the engine management system EMS. After receiving the engine torque demand, the engine management system EMS controls the engine to output the corresponding torque according to the engine torque demand, and feeds back the actual torque of the engine to the vehicle controller. VCU.

To sum up, the present invention judges and controls the ejection start of the vehicle through ejection start enable judgment, ejection start control, ejection start engine speed control and ejection start wheel torque control, and is realized by the signal interaction control of the hybrid controller. The interaction between the vehicle controller VCU, the motor controller PCU, the engine management system EMS and the instrumentation not only realizes the ejection start function of the hybrid vehicle, provides stronger starting power, but also gives users more driving pleasure. The hybrid vehicle launch control method of the present invention does not require the user to continuously step on the brake pedal for many times, and can be opened only by pressing the launch start switch or pressing the accelerator pedal and the brake pedal at the same time. .

The above description is only an overview of the technical solutions of the present invention, in order to be able to understand the technical means of the present invention more clearly, it can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand , the following specific preferred embodiments, and in conjunction with the accompanying drawings, are described in detail as follows.

Description of drawings

FIG. 1 is a schematic diagram of the ejection start enable judgment provided by the present invention.

FIG. 2 is a schematic diagram of the ejection start control provided by the present invention.

FIG. 3 is a schematic diagram of the ejection start engine speed control provided by the present invention.

FIG. 4 is a schematic diagram of the ejection starting wheel torque control provided by the present invention.

FIG. 5 is a schematic diagram of the signal interaction control of the hybrid controller provided by the present invention.

Detailed ways

In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the present invention is described in detail below with reference to the accompanying drawings and preferred embodiments.

The hybrid vehicle launch control method of the present invention includes launch start enable judgment, launch launch control, launch engine speed control, launch wheel torque control and hybrid controller signal interaction control. After judging to enter the ejection start state, the ejection start is controlled by the ejection start control, the engine speed is controlled by the ejection start engine speed control, and the wheel torque is controlled by the ejection start wheel torque control. The vehicle controller VCU uses the hybrid power The controller signal interaction control performs signal interaction with the motor controller PCU and the engine management system EMS.

Referring to FIG. 1 , in the present invention, the judgment of ejection start enablement includes the following steps:

Step S1: determine whether the current gear is a forward gear and whether the current vehicle speed is less than the vehicle speed threshold, if the current gear is a forward gear and the current vehicle speed is less than the vehicle speed threshold, then enter step S2;

Step S2: judging whether the ejection start switch of the vehicle is pressed, if the vehicle has the ejection start switch and the ejection start switch is pressed, enter the ejection start control; if the vehicle has the ejection start switch and the ejection start switch is not pressed, then Enter step S3;

Step S3: Determine whether the accelerator opening is greater than the accelerator opening threshold and whether the brake pedal opening is greater than the brake pedal opening threshold, if the accelerator opening is greater than the accelerator opening threshold and the brake pedal opening is greater than the brake pedal opening threshold , then enter the ejection start control.

Specifically, in step S1, the vehicle speed threshold is the calibration value, and in this embodiment, the vehicle speed threshold is demarcated as 10km/h; in step S2, since not all vehicle models will be equipped with an ejection start switch, if the vehicle does not have ejection start switch, you can skip step S2 and go directly to step S3; in step S3, the accelerator opening threshold and the pedal opening threshold are both calibration values. The dynamic pedal opening threshold is calibrated to be 80%. In other embodiments, the brake pedal opening is greater than the brake pedal opening threshold, and the brake master cylinder pressure can be replaced by the brake master cylinder pressure threshold, and the brake master cylinder pressure The threshold is calibrated as the brake master cylinder pressure value corresponding to 80% of the brake pedal opening.

Please also refer to Figure 2, the launch control includes the following steps:

Step S4: Send an instruction to the instrument to remind the user that the ejection start has been turned on, and pay attention to safety;

Step S5: control the engine start and load torque, enter the ejection start engine startup control and the ejection start wheel torque control;

Step S6: Determine whether the opening degree of the brake pedal is zero within the first preset time, and if the opening degree of the brake pedal reaches zero at any time point within the first preset time, the vehicle is ejected to start.

Specifically, step S4 and step S5 are performed simultaneously after the ejection start enable judgment; the ejection start engine start control and ejection start wheel torque control in step S5 can be performed simultaneously, or the execution sequence can be adjusted according to the vehicle type, as long as the vehicle It can be executed before the ejection starts; in step S6, the first preset time is a calibration value, the first preset time is calibrated to 10 seconds in this embodiment, and the time point when the first preset time starts to count is the whole vehicle The controller VCU controls the timing at which the engine is started. If the opening of the brake pedal reaches zero at any time point within the first preset time, that is, the brake pedal is completely released within 10 seconds, the vehicle will eject and start; if the opening of the brake pedal is within the first preset time If the set time does not reach zero, that is, the brake pedal is pressed and held for more than 10 seconds, and the brake pedal is not fully released, the ejection start and engine start are cancelled to save energy and protect the engine.

Please also refer to Figure 3, the ejection start engine start control includes the following steps:

Step S7: the vehicle controller VCU controls the engine to start, and after the engine completes fuel injection and ignition, the vehicle controller VCU controls the engine to run at the first engine speed.

Specifically, in the step S7, the first engine speed is a calibrated value. In this embodiment, the first engine speed is calibrated to a value between 1200rpm and 3000rpm, which is much higher than the starting engine speed of a conventional vehicle. The conventional vehicle starting method needs to drag the engine to start during the driving process, and needs to overcome the reverse drag torque of the engine. Therefore, the wheel torque will decrease during the engine starting process, which may cause the vehicle to stumble and affect the driving experience. The ejection start starts the engine on the spot when the driver steps on the brake pedal and does not release it, so that there is no engine starting process during the start-up acceleration process, and there is no setback. It has better power performance, and once the vehicle starts, it accelerates rapidly .

Please also refer to Figure 4, the ejection starting wheel torque control includes the following steps:

Step S8: The vehicle controller VCU calculates the wheel torque demand, obtains the engine torque demand and/or the motor torque demand according to the wheel torque demand, and allocates the wheel torque demand to the engine and/or the motor.

Specifically, in step S8, the vehicle controller VCU can look up the table to calculate the wheel torque demand according to the accelerator opening, or use the maximum wheel torque that the system can output as the wheel torque demand. In conventional vehicle starting, the wheel torque usually has an incremental process of about several hundreds of milliseconds from the actual start of the vehicle to reaching the target value, while the ejection start loads the wheel torque to the target value when the engine is started in situ, and the dynamic performance is better. it is good.

Please refer to Figure 5 together, the hybrid controller signal interaction control includes:

The vehicle controller VCU can send a user reminder command to the instrument when the vehicle enters the ejection start state, reminding the user that the ejection start has been turned on, pay attention to safety;

The vehicle controller VCU can send the motor torque demand to the motor controller PCU. After the motor controller PCU receives the motor torque demand, it controls the motor to output the corresponding torque according to the motor torque demand, and feeds back the actual torque of the motor to the vehicle controller. VCU;

The vehicle controller VCU can send the engine torque demand to the engine management system EMS. After receiving the engine torque demand, the engine management system EMS controls the engine to output the corresponding torque according to the engine torque demand, and feeds back the actual torque of the engine to the vehicle controller. VCU.

To sum up, the present invention judges and controls the ejection start of the vehicle through ejection start enable judgment, ejection start control, ejection start engine speed control and ejection start wheel torque control, and is realized by the signal interaction control of the hybrid controller. The interaction between the vehicle controller VCU, the motor controller PCU, the engine management system EMS and the instrumentation not only realizes the ejection start function of the hybrid vehicle, provides stronger starting power, but also gives users more driving pleasure. The hybrid vehicle launch control method of the present invention does not require the user to continuously step on the brake pedal for many times, and can be opened only by pressing the launch start switch or pressing the accelerator pedal and the brake pedal at the same time. .

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. The technical personnel, within the scope of the technical solution of the present invention, can make some changes or modifications by using the technical content disclosed above to be equivalent embodiments of equivalent changes, provided that they do not depart from the technical solution content of the present invention, according to the technical solution of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the technical solutions of the present invention.

Claims (10)

1. A hybrid vehicle launch control method, characterized in that: the hybrid vehicle launch control method comprises launch enable judgment, launch control, launch engine speed control, launch wheel torque control and hybrid The power controller signal interactive control, if the vehicle enters the ejection start state after the ejection start enable judgment, the ejection start control is used to control the ejection start, and the ejection start engine speed control is used to control the engine speed. The wheel edge torque is controlled through the ejection start wheel edge torque control, and the vehicle controller VCU performs signal interaction with the motor controller PCU and the engine management system EMS through the hybrid controller signal interaction control. 2 . The method for controlling the launch of a hybrid electric vehicle according to claim 1 , wherein the judgment of enabling launch of the hybrid electric vehicle comprises the following steps: 3 . Step S1: determine whether the gear is a forward gear and whether the current vehicle speed is less than the vehicle speed threshold, if the gear is a forward gear and the current vehicle speed is less than the vehicle speed threshold, then go to step S2; Step S2: Determine whether the ejection start switch of the vehicle is pressed. If the vehicle has the ejection start switch and the ejection start switch is pressed, the ejection start control is entered. If the vehicle has the ejection start switch and the ejection start switch is not pressed, then Enter step S3; Step S3: Determine whether the accelerator opening is greater than the accelerator opening threshold and whether the brake pedal opening is greater than the brake pedal opening threshold, if the accelerator opening is greater than the accelerator opening threshold and the brake pedal opening is greater than the brake pedal opening threshold , then enter the ejection start control. 3 . The method for controlling the launch start of a hybrid electric vehicle according to claim 2 , wherein in the step S2 , if the vehicle does not have a launch start switch, the process proceeds to step S3 . 4 . 4. The hybrid electric vehicle launch control method according to claim 2, wherein the launch control comprises the following steps: Step S4: Send an instruction to the meter, the meter reminds the user that the ejection start has been turned on, pay attention to safety; Step S5: control the engine start and load torque, enter the ejection start engine startup control and the ejection start wheel torque control; Step S6: Determine whether the opening degree of the brake pedal is zero within the first preset time, and if the opening degree of the brake pedal reaches zero at any time point within the first preset time, the vehicle is ejected to start. 5 . The method for controlling the launch of a hybrid electric vehicle according to claim 4 , wherein in the step S6 , the first preset time is a calibration value, and if the opening of the brake pedal is within the first preset time. 6 . If zero is not reached, ejection start and engine start are canceled. 6 . The method for controlling the launch of a hybrid electric vehicle according to claim 4 , wherein the launch control of the launch engine comprises the following steps: 7 . Step S7: the vehicle controller VCU controls the engine to start, and after the engine completes fuel injection and ignition, the vehicle controller VCU controls the engine to run at the first engine speed. 7 . The method for controlling the launch of a hybrid electric vehicle according to claim 6 , wherein the first engine speed is a calibration value, and its range is between 1200rpm and 3000rpm, and the first engine speed is greater than the normal start engine speed. 8 . . 8 . The method for controlling the launch start of a hybrid electric vehicle according to claim 4 , wherein the control of the wheel edge torque of the launch start comprises the following steps: 9 . Step S8: The vehicle controller VCU calculates the wheel torque demand, obtains the engine torque demand and/or the motor torque demand according to the wheel torque demand, and allocates the wheel torque demand to the engine and/or the motor. 9 . The method for controlling the launch of a hybrid electric vehicle according to claim 8 , wherein in the step S8 , the vehicle controller VCU can look up a table to calculate the wheel edge torque demand according to the accelerator opening, or the system can The output maximum wheel torque is taken as wheel torque demand. 10 . The hybrid electric vehicle launch control method according to claim 1 , wherein the hybrid electric controller signal interaction control comprises: 10 . The vehicle controller VCU can send a user reminder command to the instrument when the vehicle enters the ejection start state, reminding the user that the ejection start has been turned on, pay attention to safety; The vehicle controller VCU can send the motor torque demand to the motor controller PCU. After the motor controller PCU receives the motor torque demand, it controls the motor to output the corresponding torque according to the motor torque demand, and feeds back the actual torque of the motor to the vehicle controller. VCU; The vehicle controller VCU can send the engine torque demand to the engine management system EMS. After receiving the engine torque demand, the engine management system EMS controls the engine to output the corresponding torque according to the engine torque demand, and feeds back the actual torque of the engine to the vehicle controller. VCU.

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