阅读说明：本技术 一种发动机启停控制方法 (Engine start-stop control method ) 是由 彭凯 徐华林 官浩 户俊营 闫鲁平 刘志鹏 鲁兰 侯宗翰 邸丽伟 刘冬雨 于 2020-06-22 设计创作，主要内容包括：本发明涉及车辆技术领域,公开一种发动机启停控制方法,包括以下步骤：S11、踩下制动踏板；S12、车辆的当前车速不大于第一预设速度,记录物理量的大小,当前车速降至第二预设速度时记录车辆的车速不大于第二预设车速的时长,直至时长为第一预设时长内物理量的最大值为执行上限；S13、时长达到第一预设时长后,物理量的当前值为比较值且在任意第二预设时长内物理量的变化量为实际变化量；S14、比较值不小于执行上限或者实际变化量大于预设值,则判定驾驶员有停机的意图；S15、发动机满足基本停机条件则发动机进入停机状态。本发明公开的发动机启停控制方法能够快速地识别驾驶员的驾驶意图并结合是否满足停机条件,从而确认发动机的工作状态。(The invention relates to the technical field of vehicles, and discloses an engine start-stop control method, which comprises the following steps: s11, stepping on a brake pedal; s12, recording the size of the physical quantity when the current speed of the vehicle is not more than a first preset speed, and recording the duration when the speed of the vehicle is not more than a second preset speed when the current speed of the vehicle is reduced to the second preset speed until the maximum value of the physical quantity in the duration as the first preset duration is an execution upper limit; s13, when the time length reaches a first preset time length, the current value of the physical quantity is a comparison value, and the variable quantity of the physical quantity in any second preset time length is an actual variable quantity; s14, if the comparison value is not smaller than the execution upper limit or the actual variable is larger than a preset value, it is judged that the driver has the intention of stopping; and S15, if the engine meets the basic stop condition, the engine enters a stop state. The engine starting and stopping control method disclosed by the invention can quickly identify the driving intention of a driver and determine the working state of the engine by combining whether the stopping condition is met.)

1. An engine start-stop control method is characterized by comprising the following steps:

s11, stepping on a brake pedal;

s12, detecting the current speed of the vehicle and judging whether the current speed is not greater than a first preset speed, if so, recording the size of a physical quantity representing the stepping-on degree of the brake pedal, and when the current speed is reduced to a second preset speed, recording the duration that the speed of the vehicle is not greater than the second preset speed until the maximum value of the physical quantity is an execution upper limit in a time period that the duration is the first preset duration;

s13, when the time length that the vehicle speed is not more than a second preset speed reaches the first preset time length, the current value of the physical quantity is a comparison value, and the variable quantity of the physical quantity in any second preset time length is an actual variable quantity;

s14, judging whether the comparison value is not smaller than the execution upper limit or whether the actual variation is larger than a preset value, and if so, judging that the driver has the intention of stopping;

and S15, if the engine meets the basic stop condition, the engine enters a stop state.

2. The engine start-stop control method according to claim 1, characterized in that the physical quantity includes any one or at least two of a brake pressure generated by depressing the brake pedal, a stroke of the brake pedal, a braking force of the brake pedal, and an angle of the brake pedal.

3. The engine start-stop control method according to claim 1, characterized in that in S15, if the driver has an intention to stop but the engine does not satisfy the basic stop condition, it is continuously detected whether the engine satisfies the basic stop condition until the engine satisfies the basic stop condition, and the engine enters a stop state.

4. The engine start-stop control method according to claim 1, characterized in that if the determination result is no in S14, it is determined that the driver has no intention to stop, and in S15, the engine satisfies a basic stop condition and the engine cannot enter a stop state.

5. The engine start-stop control method according to claim 1, characterized in that in S13, after a period in which the vehicle speed is not greater than a second preset vehicle speed reaches a first preset period, the physical quantity changes by continuing to press down the brake pedal.

6. The engine start-stop control method according to claim 1, characterized in that in S13, after a period in which the vehicle speed is not greater than a second preset vehicle speed reaches a first preset period, the physical quantity is changed by raising the brake pedal and maintaining the brake pedal in a depressed state.

7. The engine start-stop control method according to claim 1, characterized in that in S12, if the period is less than the first preset period and the brake pedal is fully released, the method returns to step S11.

Technical Field

The invention relates to the technical field of vehicles, in particular to an engine start and stop control method.

Background

The engine start-stop technique is a technique for stopping the operation of the engine of the vehicle when the vehicle is temporarily stopped in order to optimize the fuel economy of the vehicle. The technology is really helpful for reducing oil consumption and eliminating the shaking feeling of the vehicle caused by idling of the engine when the vehicle temporarily stops for a long time, but under the working condition of temporary stop when the vehicle is jammed and follows the vehicle or the red light is about to turn green, the conventional engine start-stop control method can not accurately identify the driving intention and the driving working condition of the driver, and often mistakenly activates the engine start-stop function, so that the engine is frequently stopped and started, the complaint of the driver can be caused, and certain damage can be caused to the relevant hardware equipment of the engine start-stop system, such as a starter and the engine. For the above reasons, a considerable proportion of drivers may choose to completely turn off the engine start-stop function through the switch at the first time of starting the vehicle, resulting in a waste of vehicle configuration resources.

Disclosure of Invention

In view of the above, an object of the present invention is to provide an engine start/stop control method that can accurately recognize the driving intention of a driver by the operation of a brake pedal when the driver brakes a vehicle, and can confirm whether or not to bring an engine to a stopped state based on the driving intention of the driver.

In order to achieve the purpose, the invention adopts the following technical scheme:

an engine start-stop control method comprises the following steps:

s11, stepping on a brake pedal;

s12, detecting the current speed of the vehicle and judging whether the current speed is not greater than a first preset speed, if so, recording the size of a physical quantity representing the stepping-on degree of the brake pedal, and when the current speed is reduced to a second preset speed, recording the duration that the speed of the vehicle is not greater than the second preset speed until the maximum value of the physical quantity is an execution upper limit in a time period that the duration is the first preset duration;

s13, when the time length that the vehicle speed is not more than a second preset speed reaches the first preset time length, the current value of the physical quantity is a comparison value, and the variable quantity of the physical quantity in any second preset time length is an actual variable quantity;

s14, judging whether the comparison value is not smaller than the execution upper limit or whether the actual variation is larger than a preset value, and if so, judging that the driver has the intention of stopping;

and S15, if the engine meets the basic stop condition, the engine enters a stop state.

As a preferable aspect of the engine start/stop control method, the physical quantity includes any one or at least two of a brake pressure generated by depressing the brake pedal, a stroke of the brake pedal, a braking force of the brake pedal, and an angle of the brake pedal.

As a preferable mode of the engine start-stop control method, in S15, if the driver has an intention to stop the engine but the engine does not satisfy the basic stop condition, it is continuously detected whether the engine satisfies the basic stop condition until the engine satisfies the basic stop condition, and the engine enters a stop state.

As a preferable mode of the engine start/stop control method, if the determination result is no in S14, it is determined that the driver has no intention to stop the engine, and in S15, the engine satisfies the basic stop condition and the engine cannot enter the stop state.

As a preferable scheme of the engine start-stop control method, in S13, after a time period in which the vehicle speed is not greater than a second preset vehicle speed reaches a first preset time period, the brake pedal is continuously depressed, and the physical quantity changes.

As a preferable scheme of the engine start-stop control method, in S13, after a time period in which the vehicle speed is not greater than a second preset vehicle speed reaches a first preset time period, the brake pedal is lifted and kept in a pressed state, and the physical quantity is changed.

As a preferable mode of the engine start-stop control method, in S12, if the period is less than the first preset period and the brake pedal is fully released, the control returns to step S11.

The invention has the beneficial effects that: the engine start-stop control method disclosed by the invention supports the cancellation of the engine start-stop function control switch, is simple, and particularly can simply and quickly identify the driving intention of a driver through the operation action of the brake pedal when the driver brakes a vehicle, and confirms the working state of the engine according to the driving intention of the driver and whether the basic stop condition is met or not.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a block flow diagram of an engine start-stop control method according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides an engine start-stop control method, which is mainly used for judging the intention of a driver to enable an engine to enter a stop state, and as shown in fig. 1, the engine start-stop control method specifically comprises the following steps:

s11, stepping on a brake pedal;

s12, detecting the current speed of the vehicle and judging whether the current speed is not greater than a first preset speed, if so, recording the size of a physical quantity representing the stepping-on degree of a brake pedal, and when the current speed is reduced to a second preset speed, recording the duration that the speed of the vehicle is not greater than the second preset speed until the maximum value of the physical quantity in a time period with the duration being the first preset duration is an execution upper limit;

s13, after the time length that the vehicle speed is not more than the second preset speed reaches the first preset time length, the current value of the physical quantity is a comparison value and the variable quantity of the physical quantity in any second preset time length is an actual variable quantity;

s14, judging whether the comparison value is not less than the execution upper limit or whether the actual variation is greater than a preset value, and if so, judging that the driver has the intention of stopping;

and S15, if the engine meets the basic stop condition, the engine enters a stop state.

Specifically, the second preset speed is smaller than the first preset speed, and the second preset speed may be set to be zero or greater than zero, and is specifically set according to actual needs.

It should be noted that, in S12, after the brake pedal is stepped on, the vehicle starts to decelerate, the physical quantity is not recorded if the current vehicle speed is greater than the first preset speed, the physical quantity is recorded only if the current vehicle speed decreases to the first preset speed, and the execution upper limit is the maximum value of the physical quantity in a time period from the current vehicle speed being the first preset speed to the vehicle speed being not greater than the second preset speed, where the time period is the first preset time period; in S12, after the brake pedal is depressed, if the current vehicle speed is less than or equal to the first preset speed, the magnitude of the physical quantity is directly recorded, and the upper limit of the execution is the maximum value of the physical quantity in the time period from the depression of the brake pedal to the time period when the vehicle speed is not greater than the second preset speed is the first preset time period.

If the determination result is no in S14, it is determined that the driver has no intention to stop the vehicle, and in S15, the engine cannot enter the stop state even if the engine satisfies the basic stop condition.

The engine start-stop control method provided by the embodiment supports the cancellation of the engine start-stop function control switch, and is simple. Specifically, the driving intention of the driver can be recognized simply and quickly by the operation action of the brake pedal when the driver brakes the vehicle, and the operating state of the engine can be confirmed according to the driving intention of the driver and whether the basic stop condition is met.

Compared with the prior art, the activation of the engine start-stop function directly takes the intention of the driver to stop the vehicle as a necessary condition, and the start-stop function control switch is cancelled, so that the cost of the whole vehicle is reduced. Or, in other embodiments, the start-stop function control switch on the engine is changed into other switches, for example, the start-stop switch or other switches for controlling the sound are changed, and the change is improved according to the actual needs of the vehicle.

It should be noted that the physical quantity in this embodiment is a braking pressure generated by stepping on the brake pedal, the current speed of the vehicle is gradually reduced after the brake pedal is stepped on for the first time, if the current speed is greater than the first preset speed, the braking pressure is not recorded, and the braking pressure is recorded only when the current speed is equal to or less than the first preset speed. Specifically, since the brake pressure changes when the brake pedal is depressed or raised, this pressure value is detected by the electronic vehicle stability control system, and the detected brake pressure is supplied to the engine control unit, which records and compares this value to find the maximum value of the brake pressure, and stores the maximum brake pressure to compare with the brake pressure detected again in S13.

Of course, in other embodiments of the present invention, the physical quantity may be any one of a stroke of the brake pedal, a braking force of the brake pedal, and an angle of the brake pedal, where the stroke of the brake pedal is a distance that the brake pedal moves when the brake pedal is depressed, the braking force of the brake pedal is a force that the brake pedal is depressed, and the angle of the brake pedal is an angle that the brake pedal rotates when the brake pedal is depressed. Alternatively, in other embodiments, the physical quantity is at least two of a brake pressure generated by depressing the brake pedal, a stroke of the brake pedal, a braking force of the brake pedal, and an angle of the brake pedal.

In S13, if the period is less than the first preset period and the brake pedal is fully released, the process returns to step S11. That is, if the brake pedal is completely released before it is determined that the driver intends to stop the vehicle, the execution of the above-described steps is resumed.

In S13, after the period in which the vehicle speed is not greater than the second preset speed reaches the first preset period, the brake pedal is continuously depressed, and the brake pressure generated by depressing the brake pedal changes. At S13, after the period in which the vehicle speed is not greater than the second preset speed reaches the first preset period, the brake pedal is lifted and kept depressed, and the brake pressure generated by depressing the brake pedal is also changed. Specifically, after the time length that the vehicle speed is not greater than the second preset speed reaches the first preset time length, the driver presses down or lifts up the brake pedal, the brake pressure generated by stepping down the brake pedal changes, the current value of the brake pressure is a comparison value, the variation of the brake pressure in any second preset time length is an actual variation, if the comparison value is greater than or equal to an execution upper limit or the actual variation is greater than a preset value, it is determined that the driver has the intention of stopping, and if the comparison value is less than the execution upper limit and the actual variation is less than a preset value, it is determined that the driver has the intention of not stopping.

In S15, if the driver has an intention to stop the engine but the engine does not satisfy the basic stop condition, it is continuously detected whether the engine satisfies the basic stop condition until the engine satisfies the basic stop condition and the engine enters a stop state. The basic shutdown conditions include that the steering wheel angle of the vehicle is less than a preset angle, and/or the accelerator pedal is released, and/or the vacuum level in the vacuum booster is greater than a preset vacuum level, and/or the air conditioner is off, and/or the ambient temperature is greater than a first ambient temperature, and/or the engine water temperature is greater than a first preset water temperature, and/or the battery available power is greater than a preset power, and/or the road surface gradient is less than a preset gradient at S15, and/or other determination conditions, the basic shutdown conditions being associated with the specific vehicle.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.