CN110920615A - Method for exiting vehicle navigation function - Google Patents
Method for exiting vehicle navigation function Download PDFInfo
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- CN110920615A CN110920615A CN201911303256.9A CN201911303256A CN110920615A CN 110920615 A CN110920615 A CN 110920615A CN 201911303256 A CN201911303256 A CN 201911303256A CN 110920615 A CN110920615 A CN 110920615A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/18009—Propelling the vehicle related to particular drive situations
- B60W30/18145—Cornering
Abstract
The invention provides a method for exiting a vehicle navigation function, comprising the following steps: after the vehicle enters the navigation function, if the engine management system detects that the preset index items of the vehicle accord with the exit condition of the navigation function, an exit instruction for exiting the navigation function is sent to the transmission control unit, wherein the preset index items comprise: steering wheel turning; and after receiving an exit instruction triggered by the steering wheel angle, the transmission control unit controls the clutch to be closed to exit the navigation function if the rotation speed of the engine is detected to be synchronous with the rotation speed of the output shaft. The method for quitting the navigation function of the vehicle ensures that the vehicle is accelerated more safely after running out of the curve by setting the quit condition for stimulating the quit navigation function by using the steering wheel corner.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a method for quitting the navigation function of a vehicle.
Background
The power transmission system of internal combustion engine automobile is mainly composed of mechanical parts assembly of engine, speed variator and driving shaft, etc. and electronic control unit of Engine Management System (EMS) for controlling engine and speed variator control unit (TCU) for controlling automatic speed variator, etc. As is well known, an internal combustion engine automobile uses an engine to burn fuel oil, thereby converting chemical energy into mechanical energy and overcoming various resistances to realize a driving function. If the automobile keeps running at a constant speed all the time, the larger the resistance is, the more fuel is consumed. Conversely, the lower the resistance, the less fuel is consumed. Therefore, in order to improve fuel economy and reduce fuel consumption, when the vehicle speed reaches a certain threshold, if the driver does not tread on the accelerator pedal or the brake pedal, i.e. the driver does not need to accelerate or brake, the EMS will send a command to the TCU to open the clutch, so as to reduce resistance and increase the sliding distance of the vehicle, which is called a sailing function. After the automobile enters the sailing function, when a driver steps on an accelerator pedal or a brake pedal, the EMS can send an exit instruction for exiting the sailing function, and at the moment, the TCU selects a proper gear according to the speed of the automobile and combines a clutch, so that the automobile can realize normal acceleration and deceleration running.
However, in the conventional vehicle, no exit condition is provided for activating the exit navigation function by the steering wheel angle during the exit navigation function. While during actual driving, turning is a very common scenario. The existing vehicle enters a curve when the navigation function is activated, the clutch is in an open state when the navigation function is activated, when the vehicle exits the curve, a driver can step on an accelerator pedal to request acceleration, then the vehicle exits the navigation function, and the vehicle starts to accelerate by combining the clutch. It can be seen from the exit flow of the sailing function that it takes a certain time to exit the sailing function and that the vehicle will not have an acceleration response before the clutch is closed. Therefore, the driver can step on the accelerator pedal deeper when the vehicle is driving out of the curve, the driving torque suddenly rises greatly when the vehicle is quitted from the navigation function, the vehicle speed is increased suddenly, the front-driving vehicle can have insufficient steering, and the rear-driving vehicle can have over-steering, so that the safety risk exists.
Disclosure of Invention
The invention aims to set the exit condition for exciting the exit navigation function by using the steering wheel angle in the process of exiting the navigation function of the existing vehicle, and solve the problem that the acceleration of the vehicle is unsafe after exiting a curve because the exit condition for exciting the exit navigation function by using the steering wheel angle is not set in the prior art.
In particular, the invention provides a method for exiting a navigation function of a vehicle, comprising the steps of:
after the vehicle enters the navigation function, if the engine management system detects that a preset index item of the vehicle accords with the exit condition of the navigation function, an exit instruction for exiting the navigation function is sent to a transmission control unit, wherein the preset index item comprises: steering wheel turning;
and after receiving the exit instruction excited by the steering wheel angle, the transmission control unit controls the clutch to be closed to exit the sailing function if the rotation speed of the engine is detected to be synchronous with the rotation speed of the output shaft.
Further, the preset index item further comprises at least one of vehicle speed, gear and driver acceleration or braking demand.
Further, if the engine management system detects that the preset index item of the vehicle meets the exit condition of the sailing function, an exit instruction for exiting the sailing function is sent to the transmission control unit, and the exit instruction comprises the following steps: and if the engine management system detects that the angle of the steering wheel is larger than the set angle, sending an exit instruction for exiting the navigation function to a transmission control unit.
Further, if the engine management system detects that the preset index item of the vehicle meets the exit condition of the sailing function, an exit instruction for exiting the sailing function is sent to the transmission control unit, and the method further comprises the following steps: and if the engine management system detects that the speed of the vehicle is lower than a first set speed value and the driver does not step on an accelerator pedal or a brake pedal, sending an exit instruction for exiting the navigation function to a transmission control unit.
Further, if the engine management system detects that the preset index item of the vehicle meets the exit condition of the sailing function, an exit instruction for exiting the sailing function is sent to the transmission control unit, and the method further comprises the following steps: if the engine management system detects that the speed is lower than the first speed set value and a driver steps on a brake pedal, an exit instruction for exiting the navigation function is not sent to a transmission control unit; when the driver releases the brake pedal, an exit instruction for exiting the sailing function is sent to the transmission control unit.
Further, if the engine management system detects that the preset index item of the vehicle meets the exit condition of the sailing function, an exit instruction for exiting the sailing function is sent to the transmission control unit, and the method further comprises the following steps: and if the engine management system detects that the vehicle speed is higher than a second vehicle speed set value, the second vehicle speed set value is larger than the first vehicle speed set value, and a driver steps on a brake pedal to send an exit instruction for exiting the navigation function to a transmission control unit.
Further, if the engine management system detects that the preset index item of the vehicle meets the exit condition of the sailing function, an exit instruction for exiting the sailing function is sent to the transmission control unit, and the method further comprises the following steps: and if the engine management system detects that the vehicle speed is between the first vehicle speed set value and the second vehicle speed set value and a driver steps on a brake pedal, a quit instruction for quitting the sailing function is not sent to a transmission control unit.
Further, after the vehicle enters the sailing function, the driver steps on the accelerator pedal and sends an exit instruction for exiting the sailing function to the transmission control unit.
Further, if the engine management system detects that the preset index item of the vehicle meets the exit condition of the sailing function, an exit instruction for exiting the sailing function is sent to the transmission control unit, and the method further comprises the following steps: and if the engine management system detects that the driver switches the gear from the D gear to any one of the M gear, the R gear or the P gear, sending an exit instruction for exiting the sailing function to a transmission control unit.
The method for quitting the navigation function of the vehicle comprises the steps that the steering wheel angle is used as a quit condition for activating the quit navigation function, when the angle of the steering wheel angle meets the quit condition of the navigation function in the process that the vehicle runs on a curve, an engine management system sends a quit instruction for quitting the navigation function, a transmission control unit receives the quit instruction activated by the steering wheel angle, and if the rotating speed of an engine is detected to be synchronous with the rotating speed of an output shaft, a clutch is controlled to be closed to quit the navigation function, the vehicle is enabled to accelerate more safely after running out of the curve, and driving safety is improved.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Some specific embodiments of the invention will be described in detail hereinafter, by way of illustration and not limitation, with reference to the accompanying drawings. The same reference numbers in the drawings identify the same or similar elements or components. Those skilled in the art will appreciate that the drawings are not necessarily drawn to scale. In the drawings:
FIG. 1 is a flow chart of a method for exiting a vehicle cruise function according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, the method for exiting a navigation function of a vehicle of the present invention basically includes the steps of:
s1, after the vehicle enters the navigation function, if the engine management system detects that the preset index items of the vehicle accord with the exit condition of the navigation function, the engine management system sends exit instructions for exiting the navigation function to the transmission control unit, wherein the preset index items comprise: steering wheel turning;
and S2, after receiving an exit instruction triggered by the steering wheel angle, the transmission control unit controls the clutch to close to exit the sailing function if the engine speed and the output shaft speed are detected to be synchronous.
That is, as shown in fig. 1, in the method for exiting a cruising function of a vehicle according to the present invention, first, after the vehicle enters the cruising function, if an Engine Management System (EMS) detects that a preset index item of the vehicle matches an exit condition of the cruising function, the engine management system issues an exit instruction to exit the cruising function to a transmission control unit, and before the engine is turned off, the engine is started and enters an idle speed. The preset index item includes a steering wheel angle, and in the process, the steering wheel angle is mainly used in a scene that the vehicle runs in a curve as one of exit conditions for activating the navigation function. The Transmission Control Unit (TCU) then receives the exit command from the EMS and sends a torque request signal to the clutch so that the clutch is ready for clutch closure. And finally, after the transmission control unit detects that the rotating speed of the engine is synchronous with the rotating speed of the output shaft, the transmission control unit controls the clutch to be closed, and the sailing function is quitted.
The method for quitting the navigation function of the vehicle ensures that an engine management system sends a quit instruction for quitting the navigation function when the angle of the steering wheel meets the quit condition of the navigation function in the running process of the vehicle on a curve by setting the quit condition for activating the quit navigation function by using the steering wheel angle, a transmission control unit receives the quit instruction and sends a torque request signal to a clutch, the clutch receives the torque request signal, and after the transmission control unit detects that the rotating speed of the engine is synchronous with the rotating speed of an output shaft, the transmission control unit controls the clutch to be closed and the navigation function is quitted. Thus, the transmission control unit engages the clutch before the driver depresses the accelerator pedal. If the driver has an acceleration request when stepping on the accelerator pedal, the direct power output and the acceleration which meets the expectation can be realized, the intermediate delay and waiting can be avoided, the driver can not deeply step on the accelerator pedal any more, the sudden acceleration feeling can not be generated, the vehicle can be accelerated more safely after driving out of a curve, and the driving safety is improved.
According to one embodiment of the invention, the preset index items further include at least one of vehicle speed, gear and driver demand for acceleration or braking. It should be noted that the sailing function is that when the vehicle speed reaches a certain threshold, if the driver does not step on the accelerator pedal or the brake pedal at this time, that is, the driver does not have the requirement for acceleration and braking, the EMS will send an instruction to the TCU to open the clutch, so as to reduce the resistance and increase the sliding distance of the vehicle, and this function is called as the sailing function. Of course, the navigation function is understood by those skilled in the art and will not be described in detail in this application.
In the activation process of the navigation function, firstly, the TCU judges whether the clutch can be opened according to the vehicle speed condition, the gear condition, the driver's demand, and the like. When the judgment condition is that the clutch can be opened, the EMS checks whether the cruising function of the vehicle at this time has been activated. If not, the EMS sends an activation command. The TCU opens the clutch after receiving an activation command from the EMS, and transmits a clutch state signal to the EMS when the EMS transmits a command for checking the state of the clutch. After the EMS obtains the state signal of the clutch as a clutch opening signal, the EMS requests the engine to enter an idle speed, and the navigation function is activated.
The speed condition for activating the navigation function is that when the speed is between 30kph and 135kph (can be calibrated), the EMS sends out an activation instruction to allow the navigation function to be activated.
The gear condition for activating the navigation function is that when the target gear is greater than or equal to a defined gear (currently requiring 3 gears), the EMS sends an activation instruction to allow the navigation function to be activated.
The driver demand condition for activating the navigation function is that the EMS issues an activation instruction to allow activation of the navigation function when the driver does not request acceleration or braking, and both the accelerator pedal signal and the brake pedal signal are 0.
According to an embodiment of the present invention, if the engine management system detects that the preset index item of the vehicle matches the exit condition of the cruising function, issuing an exit instruction to exit the cruising function to the transmission control unit includes: if the engine management system detects that the angle of the steering wheel corner is larger than the set corner value, the engine management system sends an exit instruction for exiting the navigation function to the speed limiter control unit. Specifically, when the EMS checks that the steering wheel angle exceeds the set steering angle value after the vehicle enters the cruising function, it is possible to determine that the vehicle is traveling on a curved road. Firstly, the EMS determines that the navigation function is finished and sends out a navigation function exit instruction by taking the steering wheel angle as one exit condition according to the navigation function, and before that, if the engine is shut down, the engine is started and enters an idle speed. And after the TCU obtains a sailing function quit instruction sent by the EMS, the TCU sends a torque request signal to the clutch to prepare for closing the clutch by engaging gears. And when the TCU detects that the rotating speed of the engine is synchronous with the rotating speed of the output shaft of a certain gear, executing a clutch closing instruction, and exiting the sailing function.
The first stage is the vehicle bending-in stage, the steering wheel angle is greater than the set steering wheel angle, the command of exiting the navigation function is triggered, and the vehicle runs at a certain speed after bending-in to activate the navigation function. The second stage is a vehicle preparation bending stage, at the moment, the EMS detects that the angle of the steering wheel corner is larger than a set corner value, the EMS sends an exit instruction for exiting the navigation function, the TCU executes the exit instruction for exiting the navigation, and the clutch is closed. The third stage is the vehicle bending acceleration stage, and the driver steps on the accelerator pedal to accelerate the vehicle to get out of the curve. It can be seen that the whole process is very smooth to join. Since the condition of using the steering wheel angle to excite the exit navigation function is added, the exit instruction of exiting the navigation function is already executed after entering the curved road. When the driver is ready to accelerate, the clutch is closed and the drive train is connected and power can be output at any time. When the driver depresses the accelerator pedal, the vehicle is immediately accelerated. In the prior art, the navigation function of the vehicle is still in an activated state in the first stage and the second stage because the exit condition for activating the exit navigation function by using the steering wheel angle is not set. In the third stage, the EMS starts to execute the exit instruction of exiting the navigation function when receiving the signal of the accelerator pedal, and the vehicle finishes the closing of the clutch after exiting the curve. The driver steps on the accelerator pedal from the third stage, and the acceleration of the vehicle is obviously delayed in the process of driving out of the curve, so that the driver can deeply step on the accelerator pedal, the driving torque suddenly rises greatly when the driver exits the navigation function, the vehicle speed is suddenly increased, the front-drive vehicle can have insufficient steering, and the rear-drive vehicle can have over-steering and has safety risk.
According to an embodiment of the present invention, if the engine management system detects that the preset index item of the vehicle matches the exit condition of the cruising function, issuing an exit instruction to exit the cruising function to the transmission control unit, further includes: if the engine management system detects that the speed of the vehicle is lower than the first set speed value and the driver does not step on an accelerator pedal or a brake pedal, the engine management system sends an exit instruction for exiting the navigation function to the transmission control unit. The first vehicle speed set value can be calibrated, the first vehicle speed set value can be optimized to be 17km/h, and when the EMS detects that the vehicle speed is lower than 17km/h and a driver does not step on an accelerator pedal or a brake pedal, the EMS can send out an exit instruction for exiting the navigation function to exit the navigation function.
In some embodiments of the present invention, if the engine management system detects that the preset index item of the vehicle meets the exit condition of the cruising function, the method further includes: if the engine management system detects that the speed is lower than the first set speed value and the driver steps on the brake pedal, the engine management system does not send an exit instruction for exiting the navigation function to the transmission control unit; when the driver releases the brake pedal, the engine management system sends an exit instruction for exiting the navigation function. That is, when the EMS detects that the vehicle speed is lower than the first vehicle speed set value (17km/h), the EMS does not issue an exit instruction to exit the cruising function if the driver steps on the brake pedal, and the EMS issues an exit instruction to exit the cruising function when the driver releases the brake pedal.
According to an embodiment of the present invention, if the engine management system detects that the preset index item of the vehicle matches the exit condition of the cruising function, issuing an exit instruction to exit the cruising function to the transmission control unit includes: if the engine management system detects that the vehicle speed is higher than a second vehicle speed set value, the second vehicle speed set value is larger than the first vehicle speed set value, and the driver steps on a brake pedal, the engine management system sends an exit instruction for exiting the navigation function to the transmission control unit. That is, when the EMS detects that the vehicle speed is higher than a second vehicle speed setting, which is greater than the first vehicle speed setting (17km/h), the second vehicle speed setting may be 60 km/h. At this time, the driver steps on the brake pedal, and the EMS may issue an exit instruction to exit the navigation function.
In some embodiments of the present invention, if the engine management system detects that the preset index item of the vehicle meets the exit condition of the sailing function, the sending of the exit instruction to the transmission control unit to exit the sailing function includes: if the engine management system detects that the vehicle speed is between the first vehicle speed set value (17km/h) and the second vehicle speed set value (60km/h), at this time, if the driver steps on the brake pedal, the engine management system does not issue an exit instruction to the transmission control unit to exit the cruise function.
According to some embodiments of the present invention, when the driver steps on the accelerator pedal after the vehicle enters the cruise function, the engine management system may issue an exit instruction to the transmission control unit to exit the cruise function. When the engine management system detects that the driver switches the gear from the D gear to any one of the M gear, the R gear, or the P gear, the engine management system may issue an exit instruction to the transmission control unit to exit the cruise function.
In summary, the method for exiting the navigation function of a vehicle according to the present invention ensures that the vehicle can exit the navigation function when the angle of the steering wheel angle satisfies the exit condition of the navigation function during the course of driving on a curve by setting the exit condition using the steering wheel angle as the trigger for exiting the navigation function, and the transmission control unit is coupled to the clutch before the driver steps on the accelerator pedal. If the driver has an acceleration request when stepping on the accelerator pedal, the direct power output and the acceleration which meets the expectation can be realized, the intermediate delay and waiting can be avoided, the driver can not deeply step on the accelerator pedal any more, the sudden acceleration feeling can not be generated, the vehicle can be accelerated more safely after driving out of a curve, and the driving safety is improved.
Thus, it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the invention have been illustrated and described in detail herein, many other variations or modifications consistent with the principles of the invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (9)
1. A method for exiting a vehicle navigation function, comprising the steps of:
after the vehicle enters the navigation function, if the engine management system detects that a preset index item of the vehicle accords with the exit condition of the navigation function, an exit instruction for exiting the navigation function is sent to a transmission control unit, wherein the preset index item comprises: steering wheel turning;
and after receiving the exit instruction excited by the steering wheel angle, the transmission control unit controls the clutch to be closed to exit the sailing function if the rotation speed of the engine is detected to be synchronous with the rotation speed of the output shaft.
2. The method for exiting a vehicle voyage function of claim 1,
the preset index items further comprise at least one of vehicle speed, gear and driver acceleration or braking demand.
3. The method for exiting a vehicle voyage function of claim 2,
if the engine management system detects that the preset index item of the vehicle meets the exit condition of the navigation function, an exit instruction for exiting the navigation function is sent to the transmission control unit, and the exit instruction comprises the following steps: and if the engine management system detects that the angle of the steering wheel is larger than the set angle, sending an exit instruction for exiting the navigation function to a transmission control unit.
4. The method for exiting a vehicle voyage function of claim 2,
if the engine management system detects that the preset index item of the vehicle meets the exit condition of the navigation function, an exit instruction for exiting the navigation function is sent to the transmission control unit, and the method further comprises the following steps: and if the engine management system detects that the speed of the vehicle is lower than a first set speed value and the driver does not step on an accelerator pedal or a brake pedal, sending an exit instruction for exiting the navigation function to a transmission control unit.
5. The method for exiting a vehicle voyage function of claim 4,
if the engine management system detects that the preset index item of the vehicle meets the exit condition of the navigation function, an exit instruction for exiting the navigation function is sent to the transmission control unit, and the method further comprises the following steps: if the engine management system detects that the speed is lower than the first speed set value and a driver steps on a brake pedal, an exit instruction for exiting the navigation function is not sent to a transmission control unit; when the driver releases the brake pedal, an exit instruction for exiting the sailing function is sent to the transmission control unit.
6. The method for exiting a vehicle voyage function of claim 4,
if the engine management system detects that the preset index item of the vehicle meets the exit condition of the navigation function, an exit instruction for exiting the navigation function is sent to the transmission control unit, and the method further comprises the following steps: and if the engine management system detects that the vehicle speed is higher than a second vehicle speed set value, the second vehicle speed set value is larger than the first vehicle speed set value, and a driver steps on a brake pedal to send an exit instruction for exiting the navigation function to a transmission control unit.
7. The method for exiting a vehicle voyage function of claim 6,
if the engine management system detects that the preset index item of the vehicle meets the exit condition of the navigation function, an exit instruction for exiting the navigation function is sent to the transmission control unit, and the method further comprises the following steps: and if the engine management system detects that the vehicle speed is between the first vehicle speed set value and the second vehicle speed set value and a driver steps on a brake pedal, a quit instruction for quitting the sailing function is not sent to a transmission control unit.
8. The method for exiting a vehicle voyage function of claim 2,
after the vehicle enters the navigation function, the driver steps on the accelerator pedal and sends an exit instruction for exiting the navigation function to the transmission control unit.
9. The method for exiting a vehicle voyage function of claim 2,
if the engine management system detects that the preset index item of the vehicle meets the exit condition of the navigation function, an exit instruction for exiting the navigation function is sent to the transmission control unit, and the method further comprises the following steps: and if the engine management system detects that the driver switches the gear from the D gear to any one of the M gear, the R gear or the P gear, sending an exit instruction for exiting the sailing function to a transmission control unit.
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| CN201911303256.9A CN110920615A (en) | 2019-12-17 | 2019-12-17 | Method for exiting vehicle navigation function |
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| CN201911303256.9A CN110920615A (en) | 2019-12-17 | 2019-12-17 | Method for exiting vehicle navigation function |
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Application publication date: 20200327 |