TWI597195B - A vehicle idle controlling method - Google Patents

Description

Vehicle idle speed control method

The present invention relates to a vehicle idle speed control method, and more particularly to a vehicle idle speed control method for controlling an engine to automatically turn off and restart when an engine of an oil or hybrid electric vehicle is idling.

Press, when the steam and locomotive are parked, if the engine is not turned off and is in the idle state (Idle), the engine will continue to operate without work, not only fuel consumption but also the exhaust gas will seriously affect the air quality, therefore, there is It is necessary to idle the engine when the vehicle is idling, and then automatically start the engine to reduce fuel consumption and improve air quality.

Please refer to the invention patent case of "Motorcycle Engine Control Method and Apparatus" of the Republic of China No. I338080, which discloses a conventional vehicle idle speed control method for judging the running state of the locomotive to control the automatic flameout of the engine and Restarting the engine includes: an engine speed detecting means for detecting whether the engine is in an idle state; a locomotive speed detecting means for detecting whether the locomotive is in a stationary state; and an accelerator opening detecting means for In order to detect the change state of the throttle opening of the locomotive; a flameout control means uses an ignition control chip module to read the operation information of the locomotive, and detects that the locomotive is at a standstill state, the engine is in an idle state, and the throttle opening of the locomotive is detected. When the preset value is set to the origin, if the preset value of the automatic flameout time has been reached, the ignition control chip module controls the engine to automatically turn off; and the control means is repeatedly activated, and the ignition control chip module is used to detect the throttle of the locomotive The degree of opening, if the throttle opening is changed from the preset value of the origin to a preset value greater than a throttle opening voltage, the ignition control chip module controls a relay Move, make a run to start the motor, and controls a spark plug ignition to restart the engine. In addition, the conventional vehicle idle speed control method further includes a battery voltage detecting means for detecting a voltage state of a battery (or a battery), and if the ignition control chip module detects that the voltage value of the battery is less than a battery The voltage control preset value is used by the ignition control wafer module to stop the flameout control means.

As stated above, if the throttle opening is changed from the preset value of the origin to a preset value greater than the throttle opening voltage, when the engine is automatically started, it is easy to suddenly increase the speed due to the sudden opening of the operating throttle, so that the driver cannot The vehicle is in danger of driving the vehicle. In addition, when the voltage value of the battery is greater than or equal to the preset value of the battery voltage, the ignition control chip module will use the flameout control means to automatically turn off the engine, but by the battery The voltage value does not know whether the relay and the spark plug are faulty. When the engine is turned off, the ignition control chip module may not control the relay and ignite the spark plug due to the failure of the relay or the spark plug. The engine could not be restarted. Therefore, the above-mentioned conventional vehicle idle speed control method implies that the engine cannot be restarted after the engine is automatically turned off, and the safety considerations generated after the engine is automatically started are insufficient.

In summary, it is necessary to provide a vehicle idle speed control method to ensure that the engine can be restarted after the engine is automatically turned off, and that when the engine is restarted, the engine speed can be prevented from rising suddenly, so that the vehicle can be safely started, and environmental protection and energy conservation are taken into consideration. Safe with driving.

It is an object of the present invention to improve the above-mentioned disadvantages to provide a vehicle idle speed control method for ensuring that the engine can be restarted after the engine is automatically turned off by detecting the battery voltage drop when the engine is started.

A second object of the present invention is to provide a vehicle idle speed control method for automatically adjusting an engine throttle opening degree in an idle state when the engine is restarted to prevent a sudden increase in engine speed.

A vehicle idle speed control method includes: a judging step of receiving, by a processing unit, a battery voltage, an engine speed, an engine temperature, a vehicle speed, an ongoing state of a brake, and a throttle opening degree, and determining conditions and numbers according to a starting voltage drop The flameout determination condition determines whether the engine is to be turned off. When the start voltage drop determination condition and the plurality of flameout determination conditions are satisfied, setting an engine control mode to an automatic idle stop mode, wherein the processing unit is based on the engine start time The battery starting voltage drop value is used as a judgment basis for determining the starting voltage drop condition; and an idle speed extinguishing step is determined by the processing unit whether the engine control mode is an automatic idle extinguishing mode, and when the determination is yes, the signal is sent to the power control. The unit is controlled to stop the engine, and after the engine is turned off, the engine speed, the vehicle speed, the current state of the brake and the throttle opening degree are received, and according to several starting judgment conditions, it is determined whether the engine that has been turned off is restarted, and the number is to be restarted. When the start determination conditions are all set, the engine control mode is set to a new startup mode; and a restarting step, the processing unit determines whether the engine control mode is a restart mode, and when it is determined to be YES, first determines that the rear brake state is that the vehicle is being braked, and then sends the signal to a motor control unit. And a valve control unit, wherein the engine that has been turned off is smoothly started, wherein the throttle control unit is an electronic throttle valve, and the processing unit determines whether the engine has been determined according to the engine speed when the motor control unit smoothly starts the engine Start to start, if the determination is yes, set the engine control mode to the throttle control mode, the throttle control mode is determined by the processing unit to determine whether the engine control mode is the restart mode, and if the determination is yes, It is determined whether the throttle opening degree is less than an idle speed throttle opening value. If the determination is yes, the vehicle is in an idle state, and then it is determined whether the braking state is that the braking is being performed. If the determination is yes, the processing unit sends a signal. To the throttle control unit of the section, reduce the throttle opening of the engine. If the judgment is no, then determine whether there is throttle opening. If the determination is YES, the processing unit sends the signal to the A throttle control unit, gradually increasing the steam valve opening degree of the throttle of the engine, the vehicle is smoothly started.

The vehicle idle speed control method of the present invention, wherein the determining step is performed by the processing unit to calculate a starting voltage drop value when the engine is started according to the battery voltage, and if the starting voltage drop value is less than a normal value of the voltage drop, the starting voltage is The judgment condition is established.

The vehicle idle speed control method of the present invention, wherein the determining step is that the processing unit calculates the vehicle rest time according to the vehicle speed, and if the engine speed is less than an idle engine speed, the engine temperature reaches an engine normal operating temperature, and the vehicle speed is a vehicle stationary speed. If the brake state is that the vehicle is being braked, the throttle opening is less than an idle throttle opening value, and the vehicle rest time reaches a rest threshold time, the flameout determination condition is established.

The vehicle idle speed control method of the present invention, wherein the idle speed extinguishing step is determined by the processing unit, if the engine speed is an engine static speed, the vehicle speed is the vehicle rest speed, the throttle opening is greater than the idle throttle opening degree, and the braking state is If the vehicle is being braked, the start determination condition is established.

The vehicle idle speed control method of the present invention, wherein the idle speed extinguishing step is performed by the processing unit after the engine is turned off, sending a signal to a display unit and a flashing unit, and the display unit displays the fuel saving rate and the flameout time of the engine stalling, and The scintillation unit intermittently activates the lighting device of the vehicle.

In the vehicle idle speed control method of the present invention, after the engine is smoothly started, the processing unit determines whether the engine startup time is greater than a start threshold time. If the determination is yes, the signal is sent to a display unit to display a warning that the engine is difficult to start. message.

In the vehicle idle speed control method of the present invention, the determining step is determined by the processing unit whether the engine temperature is less than a cold door threshold temperature, and if the determination is yes, the engine control mode is set to a cold start mode.

The vehicle idle speed control method of the present invention, wherein the determining step is determined by the processing unit whether the engine temperature is less than a cold door threshold temperature, and if the determination is no, the engine control is set when the vehicle speed of the vehicle reaches a specific speed. The mode is set to the vehicle travel mode.

The vehicle idle speed control method of the present invention, wherein the voltage drop has a normal value of 3 volts.

The vehicle idle speed control method of the present invention, wherein the idle engine speed is 1800 r.p.m.

The vehicle idle speed control method of the present invention, wherein the idle engine temperature is 70 degrees.

The vehicle idle speed control method of the present invention, wherein the vehicle stationary speed is 0 km/h.

The vehicle idle speed control method of the present invention, wherein the idle throttle opening value is 5%.

The vehicle idle speed control method of the present invention, wherein the stationary threshold time is 3 seconds.

The vehicle idle speed control method of the present invention, wherein the engine stationary speed is 0 r.p.m.

The vehicle idle speed control method of the present invention, wherein the cold door threshold temperature is 70 to 75 degrees.

The vehicle idle speed control method of the present invention, wherein the specific speed is 10 km/h.

The above and other objects, features and advantages of the present invention will become more <RTIgt; The engine speed in the case where the engine is started without the accelerator (i.e., the throttle opening is equal to zero) is understood by those of ordinary skill in the art to which the present invention pertains.

The "cold vehicle start mode" as described in the full text of the present invention means that when the engine temperature of the vehicle is lower than the normal working temperature or the engine is not running for a long time, the engine starts to take a long time, and the pollution emission of the idle speed is high. The cold state, so the driver can only start the engine by means of a conventional engine start mode (e.g., pressing a start button), as will be understood by those of ordinary skill in the art to which the present invention pertains.

The "vehicle driving mode" as used throughout the present invention means that when the engine of the vehicle is started, when the vehicle travels faster than a specific speed (for example, 10 km/hour), and the engine temperature exceeds a cold door threshold temperature (for example, 70) The state of the hot car to 75 degrees), in which the amount of pollution emission of the idle stop is low, which is common to those skilled in the art to which the present invention pertains. solution.

The "automatic idle stop mode" as described in the full text of the present invention refers to a state in which the engine is ignited and the engine is turned off to reduce the fuel consumption and air pollution when a specific flameout condition is satisfied. Those with ordinary knowledge in the field can understand.

The "restart mode" described in the full text of the present invention refers to a state in which the engine of the vehicle is automatically idling and extinguished, and the engine is restarted for the driver to ride in a situation in which a specific starting condition is satisfied. Those of ordinary skill in the art will understand.

The "gate control mode" as described in the full text of the present invention refers to a state in which the engine opening degree of the engine is automatically adjusted in an idle state after the start of the engine of the vehicle to reduce the state of the engine speed, which is the technology of the present invention. Those with ordinary knowledge in the field can understand.

The "voltage drop" as used throughout the present invention means that the voltage value of the battery of the vehicle is reduced from a higher voltage value to a lower voltage value, for example, if the voltage value is reduced from 12 volts to 9 volts, the voltage is The reduction to 3 volts is understood by those of ordinary skill in the art to which the present invention pertains.

The "in progress brake" as described throughout the present invention refers to a process in which the brake system of the vehicle is reducing the wheel speed of the vehicle, as will be understood by those of ordinary skill in the art to which the present invention pertains.

Please refer to FIG. 2 , which is a system diagram of a preferred embodiment of the vehicle idle speed control method of the present invention, which includes a processing unit 1, a power control unit 2, a motor control unit 3 and a valve control unit. 4. The processing unit 1 is electrically connected to the power control unit 2, the motor control unit 3, and the throttle control unit 4 for controlling a vehicle (for example, a machine) The engine of the car or car, etc.) is turned off and restarted. In this embodiment, only the water-cooled locomotive with the electronic throttle is used as an embodiment to illustrate the situation in which the engine is turned off and restarted when the engine is idling, but not limited thereto.

For example, the processing unit 1 is composed of a device having a data processing and storage function, such as a microprocessor (Micro-Processor), a digital information processor (DSP), or a special function integrated circuit (ASIC). A flameout signal, a start signal and a control signal are generated by the driving state of the vehicle to control the engine to be turned off, and wait for a period of time before restarting. The processing unit 1 is electrically connected to a start switch (for example, a conventional electronic switch or a faucet lock, etc.), and the start switch is electrically connected to a battery (Battery, not shown). When the start switch is turned on (ON), the The processing unit 1 can obtain the required power from the battery. And the processing unit 1 is electrically connected to the device for sensing the driving state of the vehicle, for example: a cylinder head temperature sensor, an engine speed sensor, a vehicle speed sensor, a brake sensor, and a throttle opening sensor. Or driving computer (ECU), etc., but not limited to, input information about driving status, such as: power status, engine temperature, engine speed, vehicle speed, front and rear brake status, throttle opening and / or battery Information such as voltage, when the engine of the vehicle is idling, the processing unit 1 can output a signal to extinguish the engine of the vehicle (for example, a locomotive or a car, etc.) and wait for a while before restarting.

The power control unit 2 is constituted by a conventional driving computer (ECU). The power control unit 2 is electrically connected to the processing unit 1, and can receive signals output by the processing unit 1 to turn off or start the engine. For example, the power control unit 2 is electrically connected to a normally closed relay (normal closed) Relay), the relay is electrically connected to the processing unit 1, the start switch and the engine of the vehicle, and the processing unit 1 can output an OFF or ON signal to the relay to cut or connect the power control unit 2 The connection between the engine and the engine is turned off or started.

The motor control unit 3 is composed of a conventional starter motor, and the motor control unit 3 is electrically connected to the processing unit 1 for accepting the activation signal of the processing unit 1, and outputting a signal to enable the engine to start.

The throttle control unit 4 is composed of a device that uses an electronic signal control engine, such as an electronic throttle valve, and the throttle control unit 4 is electrically connected to the processing unit 1 for accepting the processing. Unit 1 controls the signal and adjusts the engine's throttle opening.

In addition, the present invention can also be provided with a display unit 5 and a flashing unit 6, and the processing unit 1 can generate a plurality of display signals and a blinking signal. The display unit 5 is configured by a device that can display information, such as a human machine interface (HMI) or a digital meter. The display unit 5 is electrically connected to the processing unit 1 for receiving the display signal of the processing unit 1. And display information about the idle speed control, such as: engine status, whether the engine is started too long, the engine start difficulty warning, the fault warning sign, the fuel saving rate, the auto-extinguishing countdown seconds or the flameout time, etc., but not limited thereto; The flashing unit 6 is composed of a device for controlling the flashing function of the light, for example, a light flashing controller or a flasher, and the flashing unit 6 is electrically connected to the processing unit 1 and the lighting device of the vehicle (for example, a directional light and/or a headlight) And the like, for receiving the flashing signal of the processing unit 1, and causing the illumination device of the vehicle to intermittently operate (for example, the direction light and the headlight are blinking).

Please refer to Figures 2 and 3 together, wherein Figure 3 is the present invention. A flow chart of a preferred embodiment of the vehicle idle speed control method includes a determining step S1, an idle extinguishing step S2, and a restarting step S3. The determining step S1 is to receive a plurality of driving status information (for example, battery voltage, engine speed, engine temperature, vehicle speed, braking state, throttle opening, etc.) by a processing unit 1, and determine conditions according to a starting voltage drop. And a plurality of flameout determination conditions determine whether the engine is to be turned off. When the starting voltage drop determination condition and the plurality of flameout determination conditions are satisfied, setting an engine control mode to "automatic idle stop mode".

In detail, please refer to FIG. 4, which is a power control flow chart of the present invention, wherein when the driver turns off the start switch, the processing unit 1 will judge whether the engine has been started, if it is judged If YES, the processing unit 1 sends a signal (for example, a flameout signal) to the normally closed relay, so that the normally closed relay is turned off, and the engine is turned off; when the driver turns on the startup switch, the processing unit 1 will judge whether the engine has been started. If the determination is No, the processing unit 1 sends a signal (for example, a start signal) to the normally closed relay to turn on the normally closed relay and let the engine start.

In addition, when the driver passes the start switch, the processing unit 1 starts to record the battery voltage value, and after the driver starts the engine, the processing unit 1 determines the temperature of the engine operation according to the engine temperature (for example, the cylinder head temperature). Is it less than a cold door threshold temperature (for example: 70 to 75 degrees, °C), if it is judged as "yes", the engine is in the "cold state", in this state, due to the long engine start-up time and high idle pollution, Therefore, the processing unit 1 still does not set the engine control mode to "automatic idle stop mode" or "restart mode", and sets the engine control mode to "cold car start" If the judgment is "No", the temperature at which the engine is running has reached the normal operating temperature. When the vehicle speed of the vehicle reaches a certain speed (for example, 10 km/h), the processing unit 1 judges that the engine is at "Hot car status", and set the engine control mode to "vehicle travel mode".

Next, please refer to Figures 2 and 5, Figure 5 is a schematic diagram of the battery voltage of the engine start. The processing unit 1 will calculate one of the engine start periods T _{S according to} the battery voltage value before/in the middle of the engine start. The voltage drop value V _D , if the startup voltage drop value V _{D is} less than a normal value of a voltage drop, for example, 2.5 to 3.5 volts, the starting voltage drop determination condition is established. In the embodiment, the normal value of the voltage drop is 3 volts is explained as an implementation. Thereafter, the processing unit 1 receives the plurality of driving status information (for example, engine temperature, engine speed, vehicle speed, braking state and throttle opening degree, etc.), calculates vehicle stationary time from the vehicle speed, and determines the plurality of flameout determinations. Whether or not the conditions (for example, the engine speed, the engine temperature, the vehicle speed, the state in which the brake is in progress, the accelerator opening degree, and the vehicle stationary time) are satisfied, and if the plurality of flameout determination conditions are simultaneously satisfied, the processing unit 1 determines The engine is in an "idle state" in which the engine can be turned off, and then the idle-off step S2 is performed.

More specifically, when the processing unit 1 is activated, the processing unit 1 continuously records the battery voltage value to calculate and store the startup voltage drop value V _D . When the engine starts abnormally (for example: relay or spark plug failure), the battery voltage drop when the engine starts will be greater than the normal value of the voltage drop (for example: 3 volts), and the engine start time will be different from the normal start time. After the engine is started, the battery voltage will return to normal. Therefore, if only the battery voltage value after the engine is started is judged, the engine will be started normally, and the engine will be turned off when the vehicle is idling, which may cause the engine. It cannot be started again after the flameout. Therefore, as long as the starting voltage drop determination condition is not established, the processing unit 1 does not control the engine to perform the "automatic idle stop mode", so that the engine cannot be restarted after the flame is turned off, and at the same time, a signal is sent to the display unit 5 for display. "Fault warning". Therefore, the processing unit 1 can ensure that the engine does not start to be difficult to start after the flame is extinguished by the starting voltage drop determination condition.

Next, referring to FIG. 6, it is a flowchart of the idle reduction determination of the present invention, wherein the processing unit 1 receives the plurality of driving status information (for example, engine temperature, engine speed, vehicle speed, and the state in which the vehicle is in progress) And the throttle opening degree, etc., the vehicle rest time is calculated from the vehicle speed, and it is judged whether the following flameout judgment conditions (1a), (1b), (1c), (1d), (1e), and (1f) are established, respectively. After the following: (1a) Determine whether the engine temperature has reached the normal operating temperature of an engine (for example, 70 ° C) or more? If the processing unit 1 determines that the flameout determination condition (1a) is established, the flameout determination condition (1b) is performed; otherwise, the processing unit 1 continues to receive the driving state information; therefore, the flameout determination condition (1a) can be used to determine Whether the engine is in the "hot state", to avoid restarting the engine in the "cold state", the engine will not reach the working temperature and cause difficulty to start; (1b) determine whether the engine speed is less than an idle engine speed (for example: 1800r.pm)? If the processing unit 1 determines that the flameout determination condition (1b) is established, the flameout determination condition (1c) is performed; otherwise, the processing unit 1 continues to receive the driving state information; therefore, the flameout determination condition (1b) can be used to determine Whether the engine is in "idle state", avoiding "non-idle speed" "State" will turn off the engine; (1c) Determine whether the speed of the vehicle is a vehicle's resting speed (for example: 0 km / h)? If the processing unit 1 determines that the flameout determination condition (1c) is established, the flameout determination condition (1d) is performed; otherwise, the processing unit 1 continues to receive the driving state information; therefore, the flameout determination condition (1c) can be used to determine Whether the vehicle is in the "parking state"; (1d) determining whether the braking state (for example, the front brake, the rear brake or a combination thereof) is being braked (for example: the brake signal is "1")? If the processing unit 1 determines that the flameout determination condition (1d) is established, the flameout determination condition (1e) is performed; otherwise, the processing unit 1 continues to receive the driving status information; therefore, the flameout determination condition (1d) can be used to ensure The vehicle is in a "parking state" to prevent the engine from stalling in the "non-stationary state"; (1e) determining whether the throttle opening is less than an idle throttle opening value (for example: 5%)? If the processing unit 1 determines that the flameout determination condition (1e) is established, the flameout determination condition (1f) is performed; otherwise, the processing unit 1 continues to receive the driving status information; wherein, when the vehicle is in the "parking state", driving The throttle valve is normally vented. Therefore, the flameout determination condition (1e) can be used to determine whether the throttle is rotated by the throttle opening degree, and whether the driver has the willingness to stop; (1f) determining whether the vehicle rest time reaches a rest threshold time ( For example: 3 to 5 seconds)? When the processing unit 1 determines that the flameout determination condition (1f) is established, the above-described flameout determination conditions (1a), (1b), (1c), (1d), (1e), and (1f) are simultaneously established. Otherwise, the processing is performed. Unit 1 continuously receives the driving status information; therefore, the flameout determination condition (1f) is available In order to prevent the vehicle from stalling due to a short stop state such as a slewing or encountering a stop sign (for example, a flashing yellow light or a flashing red light), the processing unit 1 sends the signal to the reversal countdown in the countdown. To the display unit 5 to remind the driver that the engine is about to be turned off.

Wherein, when the startup voltage drop determination condition, the flameout determination conditions (1a), (1b), (1c), (1d), (1e), and (1f) are simultaneously established, the processing unit 1 determines that the engine is in The "idle state" of the engine can be turned off, and the engine control mode is set to "automatic idle stop mode", and then the idle stop step S2 is performed.

The idling stop step S2 is determined by the processing unit 1 whether the engine control mode is "automatic idling stop mode". If the determination is YES, a signal is sent to the power control unit 2 to control the engine to be turned off, after the engine is turned off. And receiving the plurality of driving status information (for example: engine speed, vehicle speed, current state of the brake and throttle opening degree, etc.), and determining whether to restart the engine that has been turned off according to a plurality of starting determination conditions, waiting for the number When all the start determination conditions are satisfied, the engine control mode is set to "restart mode".

In detail, the idling stop step S2 sends a signal to the power control unit 2 by the processing unit 1 to cut off the power of the engine to turn off the engine. After the engine is turned off, the processing unit 1 sends a signal to the display. The unit 5 and the scintillation unit 6 display the fuel economy rate and the flameout time of the engine flameout by the display unit 5, and the blinking unit 6 intermittently activates the light-emitting device of the vehicle (for example, the directional light and the headlights flash). When the engine is idling and the flame is turned off, the vehicle can be alerted to the surrounding vehicles to avoid danger to the driver.

Please refer to FIG. 7 , which is the light flashing control process of the present invention. In the figure, when the engine control mode is "automatic idle stop mode", the processing unit 1 determines whether the engine is off. If the determination is YES, the processing unit 1 sends a signal to the flashing unit 6 to cause the flashing. Unit 6 controls the headlights and direction lights of the vehicle to flash simultaneously. The processing unit 1 can also send a signal to the flashing unit 6, and the headlight power supply is turned off, and only the direction light is blinked to save power consumption.

Next, please refer to FIG. 8 , which is a restart determination flowchart of the present invention, wherein the processing unit 1 is configured by the plurality of driving status information (eg, engine speed, vehicle speed, current state of the brakes, and throttle opening). Whether to determine whether the following start determination conditions (2a), (2b), (2c), and (2d) are established, respectively, as follows: (2a) determine whether the engine speed is an engine stationary speed (for example: 0r) .pm)? If the processing unit 1 determines that the startup determination condition (2a) is established, the startup determination condition (2b) is performed, otherwise the processing unit 1 continues to receive the driving status information; therefore, the startup determination condition (2a) can be used to determine the engine. Is it in the "extinction state" to avoid engine restart in the "non-extinguished state"; (2b) Is it determined whether the vehicle speed is the vehicle's static speed (for example: 0 km / h)? If the processing unit 1 determines that the start determination condition (2b) is established, the start determination condition (2c) is performed, otherwise the processing unit 1 continues to receive the driving status information; therefore, the start determination condition (2b) can be used to determine the vehicle. Is it in the "parking state"; (2c) Is it determined whether the brakes (front brake, rear brake or combination thereof) are in the state of being braked? If the processing unit 1 determines that the activation determination condition (2c) is established, the startup determination condition (2d) is performed, otherwise the processing order is The vehicle 1 continuously receives the driving status information; therefore, the starting determination condition (2c) can be used to ensure that the vehicle is in the "parking state" to prevent the vehicle from restarting the engine in the "non-driving state", wherein the throttle opening is too large, which may result in The speed suddenly rises. Therefore, when the driver turns the throttle to restart the engine, it is confirmed that the brake is in the state of being braked, which will avoid the throttle opening being too large and causing the vehicle to suddenly advance, affecting the safety of the driver; The power output is on the rear wheel. Therefore, it is confirmed that the brake is being braked. When the engine is started, the driver can be prevented from being thrown by the forward power; (2d) whether the throttle opening is greater than the idle throttle opening (for example: 3 to 5%)? If the processing unit 1 determines that the start determination condition (2d) is established, the start determination conditions (2a), (2b), (2c), and (2d) are simultaneously established; otherwise, the processing unit 1 continues to receive the driving status information. In the case where the vehicle is in the "parking state", the driver usually empties the throttle. Therefore, the starting determination condition (2d) can be used to determine whether the accelerator is rotated by the accelerator opening degree, and whether the driver has the will to restart the engine. .

Wherein, when the start determination conditions (2a), (2b), (2c), and (2d) are simultaneously established, the processing unit 1 determines that the driver wants to restart the engine, and then performs the restarting step S3.

In the restarting step S3, the processing unit 1 determines whether the engine control mode is the "restart mode". When the determination is "YES", the signal is sent to the motor control unit 3 and the throttle control unit 4, so that The engine that has been turned off starts smoothly. In detail, when the engine control mode is "restart mode", the processing unit 1 sends a signal to the motor control unit 3, the throttle control unit 4, the display unit 5, and the flashing unit. 6. The motor control unit 3 activates the engine, the throttle control unit 4 controls the throttle of the engine, the display unit 5 displays relevant information, and the blinking unit 6 performs the complex light control.

Referring to FIG. 9, it is a re-lighting control flowchart of the present invention, wherein when the engine control mode is "restart mode", the processing unit 1 determines whether the engine is started, and if the determination is "YES", Then, the processing unit 1 sends a signal to the flashing unit 6, so that the blinking unit 6 controls the headlight of the vehicle to resume illumination, and stops blinking after the direction light is extinguished.

Referring to FIG. 10, it is a motor control flowchart of the present invention, wherein when the engine control mode is "restart mode", the processing unit 1 sends a signal to the motor control unit 3, which is controlled by the motor. The unit 3 restarts the engine. At the same time, the processing unit 1 records an engine startup time. After the engine startup is completed, the processing unit 1 determines whether the engine is started for too long. (ie, determining whether the engine startup time is greater than a startup threshold time, for example, 3 seconds. If the determination is YES, the processing unit 1 sends a signal to the display unit 5 to display a warning message that the engine is difficult to start, for example, a fault. The processing unit 1 no longer sets the engine control mode to "automatic idle stop mode" to cancel the mechanism of automatic idle stop, and the processing unit 1 can send a signal to the throttle control unit 4 to Limit the power output of the vehicle.

Please refer to FIG. 11 , which is a display control flowchart of the present invention. If the processing unit 1 performs engine state detection, it is determined whether the engine is started too long. If the determination is YES, the display unit 5 is A warning message indicating that the engine is difficult to start; if the determination is "No", the processing unit 1 calculates an automatic idle deceleration countdown time and fuel saving during engine stall The rate is further displayed by the display unit 5 for the automatic idling stop countdown time and the fuel saving rate.

Referring to FIG. 12, it is a flowchart of the valve control of the present invention, wherein the processing unit 1 determines whether the engine has started according to the engine speed, and if the determination is YES, sets the engine control. The mode is "section control mode", and the processing unit 1 first determines whether the throttle opening is less than a idling throttle opening value (for example, 5%). If the determination is "YES", the vehicle is " If the determination is YES, the processing unit 1 sends a signal to the throttle control unit 4 to reduce the throttle opening of the engine, and if it is determined to be If no, it is judged whether there is throttle opening. If the determination is YES, the processing unit 1 sends a signal to the throttle control unit 4, slowly increasing the throttle opening of the engine to smooth the vehicle. Start up.

Please refer to FIG. 13 , which is a schematic diagram of a throttle control of a preferred embodiment of the vehicle idle speed control method of the present invention, wherein the processing unit is in a state in which the rear brake state is being braked (ie, the brake signal curve C is at a high level). 1 will send a signal to the motor control unit 3, at this time, the engine throttle opening curve B slowly increases with the throttle opening curve A, if the engine starts to start for T _A and the engine starts to complete time For T _B , the processing unit 1 sends a signal to the throttle control unit 4 again, so that the value of the throttle opening curve B is lowered, and the value of the throttle opening degree and the value of the throttle opening degree are excessively increased. The value of the engine speed curve D _N when the brake is released is too high, and the engine speed can be effectively reduced compared to the engine speed curve D _O without reducing the throttle opening. When the value of the throttle opening is reduced to a certain level (ie, time T _C ), the processing unit 1 sends a signal to make the rear brake state to release the brake (ie, the brake signal curve C is at a low level), so that the vehicle starts forward. Moving, at the same time, the processing unit 1 sends a signal to the throttle control unit 4, so that the value of the throttle opening curve B slowly rises to the value of the throttle opening curve A, so that the engine generates smoothing power and makes the engine speed And the vehicle speed curve E _{N is} slowly increased. Compared with the vehicle speed curve E _O without reducing the throttle opening degree, it can be found that the vehicle's forward speed can be gently increased after the vehicle is released. Thereby, when the engine is started, the situation that the engine speed suddenly rises due to the excessive throttle opening degree can be avoided, and the driver is prevented from being dangerous due to the restart of the engine.

In addition, the vehicle idle speed control method of the present invention can also be applied to a water-cooled automobile having an electronic throttle valve, and the application manner is as described above, and is not described herein.

The main features of the vehicle idle speed control method disclosed by the present invention are as follows: The processing unit 1 calculates the starting voltage drop value by detecting the battery voltage value before, during, and after the engine is started. V _D , if the starting voltage drop value V _{D is} less than the normal value of the voltage drop, the starting voltage drop determination condition is established, that is, the engine will not be difficult to start after the flameout (for example: relay or spark plug failure), Next, the processing unit 1 determines the flameout determination conditions (1a), (1b), (1c), and the plurality of driving state information (for example, engine temperature, engine speed, vehicle speed, rear brake state, and throttle opening degree). Whether (1d), (1e), and (1f) are established to determine that the engine is in an "idle state" that can turn off the engine to ensure that the engine can be restarted after the engine is automatically turned off. Therefore, the vehicle idle speed control method of the present invention can be restarted after the engine is turned off in addition to being extinguished when the engine is idling to achieve the effect of environmental protection and energy saving, so as to achieve the effect of not losing engine power.

Furthermore, the processing unit 1 first sends a signal to start the engine, and then sends a signal to the throttle control unit 4, by lowering the throttle opening degree, and waiting for the rear brake state to be released, the re-enforcement section The technical means of slowly increasing the valve opening with the throttle opening allows the engine to produce smoother power while preventing the engine's engine speed from rising suddenly. Therefore, the vehicle idle speed control method of the present invention can make the vehicle start safely and smoothly when the engine is restarted, so as to avoid the danger of the driver and the passerby being dangerous.

While the invention has been described in connection with the preferred embodiments described above, it is not intended to limit the scope of the invention. The technical scope of the invention is protected, and therefore the scope of the invention is defined by the scope of the appended claims.

〔this invention〕

1‧‧‧Processing unit

2‧‧‧Power Control Unit

3‧‧‧Motor control unit

4‧‧‧ Valve Control Unit

5‧‧‧Display unit

6‧‧‧Blinking unit

S1‧‧‧ judgment steps

S2‧‧‧Idle speed extinguishing step

S3‧‧‧Restart steps

A‧‧‧ throttle opening curve

B‧‧‧Vate opening curve

C‧‧‧Car signal curve

D _O , D _N ‧‧‧ engine speed curve

E _O , E _N ‧‧‧ speed curve

V _D ‧‧‧Starting voltage drop

T _A ‧‧‧ engine start time

T _B ‧‧‧Engine start completion time

T _C ‧‧‧ brake release time

T _S ‧‧‧ During engine start-up

Figure 1 is a block diagram of a preferred embodiment of a conventional vehicle idle speed control method.

Fig. 2 is a schematic view showing the system of the preferred embodiment of the vehicle idle speed control method of the present invention.

Fig. 3 is a flow chart showing a preferred embodiment of the vehicle idle speed control method of the present invention.

Fig. 4 is a flow chart showing the power supply control of the preferred embodiment of the vehicle idle speed control method of the present invention.

Figure 5: The engine of the preferred embodiment of the vehicle idle speed control method of the present invention The battery voltage diagram of the moving battery.

Fig. 6 is a flow chart showing the determination of the idle reduction of the preferred embodiment of the vehicle idle speed control method of the present invention.

Figure 7 is a flow chart showing the light flicker control of the preferred embodiment of the vehicle idle speed control method of the present invention.

Figure 8 is a flow chart showing the restart determination of the preferred embodiment of the vehicle idle speed control method of the present invention.

Figure 9 is a flow chart showing the re-lighting control of the preferred embodiment of the vehicle idle speed control method of the present invention.

Fig. 10 is a flow chart showing the motor control of the preferred embodiment of the vehicle idle speed control method of the present invention.

Figure 11 is a flow chart showing the display control of the preferred embodiment of the vehicle idle speed control method of the present invention.

Fig. 12 is a flow chart showing the control of the throttle of the preferred embodiment of the vehicle idle speed control method of the present invention.

Figure 13 is a schematic view showing the throttle control of the preferred embodiment of the vehicle idle speed control method of the present invention.

S1. . . Judgment step

S2. . . Idle flameout step

S3. . . Restart step

Claims (17)

A vehicle idle speed control method includes: a judging step of receiving, by a processing unit, a battery voltage, an engine speed, an engine temperature, a vehicle speed, an ongoing state of a brake, and a throttle opening degree, and determining conditions and numbers according to a starting voltage drop The flameout determination condition determines whether the engine is to be turned off. When the start voltage drop determination condition and the plurality of flameout determination conditions are satisfied, setting an engine control mode to an automatic idle stop mode, wherein the processing unit is based on the engine start time The battery starting voltage drop value is used as a basis for determining the starting voltage drop determination condition; in an idle speed extinguishing step, the processing unit determines whether the engine control mode is an automatic idle extinguishing mode, and if the determination is yes, sending a signal to a power control unit After the engine is turned off, after the engine is turned off, the engine speed, the vehicle speed, the current state of the brake and the throttle opening degree are received, and according to a plurality of starting judgment conditions, it is determined whether the engine that has been turned off is restarted, and the plurality of engines are restarted. When the start judgment condition is satisfied, the engine control mode is set to be heavy. a startup mode; and a restarting step, the processing unit determines whether the engine control mode is a restart mode, and when it is determined to be YES, first determines that the brake state is that the vehicle is being braked, and then sends the signal to a motor control unit and a valve control unit that smoothly starts the engine that has been turned off, wherein the throttle control unit is an electronic throttle valve, and the processing unit determines whether the engine has started according to the engine speed when the motor control unit smoothly starts the engine Startup, if the determination is yes, set the engine control mode to the throttle control mode, the throttle control mode is determined by the processing unit to determine whether the engine control mode is the restart mode, and if the determination is yes, then determine Whether the throttle opening degree is less than the idle speed of the throttle opening degree, if the judgment is yes, the vehicle is in an idle state, and then it is determined whether the braking state is the braking in progress, and if the determination is yes, the processing unit sends the signal to The throttle control unit of the section reduces the throttle opening degree of the engine. If the judgment is no, it is determined whether there is an accelerator opening degree. Determination is YES, the processing unit sends the signal to the A throttle control unit, gradually increases the engine A throttle opening degree, the vehicle is smoothly started. The vehicle idle speed control method according to claim 1, wherein the determining step is: the processing unit calculates a starting voltage drop value when the engine is started according to the battery voltage, and if the starting voltage drop value is less than a voltage drop The normal value, the starting voltage drop determination condition is established. The vehicle idle speed control method according to claim 1, wherein the determining step is that the processing unit calculates the vehicle rest time according to the vehicle speed, and if the engine speed is less than an idle engine speed, the engine temperature reaches an engine normal working temperature. When the vehicle speed is a vehicle rest speed, the brake state is that the vehicle is being braked, the throttle opening is less than an idle throttle opening value, and the vehicle rest time reaches a rest threshold time, the flameout determination condition is established. The vehicle idle speed control method according to claim 1, wherein the idle speed extinguishing step is determined by the processing unit, if the engine speed is an engine static speed, the vehicle speed is the vehicle stationary speed, and the throttle opening is greater than the idle speed. The start determination condition is established when the accelerator opening degree and the brake state are the ongoing brakes. The vehicle idle speed control method according to claim 1, wherein the idle speed extinguishing step is performed by the processing unit after the engine is turned off, sending a signal to a display unit and a flashing unit, and the display unit displays the fuel economy of the engine being turned off. Rate and flameout time, and the blinking unit causes the illuminating device of the vehicle to intermittently operate. According to the vehicle idle speed control method of claim 1, wherein the processing unit determines whether the engine startup time is greater than a start threshold after the engine is smoothly started, and if the determination is yes, the signal is sent to a display unit. , displays a warning message that the engine is starting to be difficult. The vehicle idle speed control method according to claim 1, wherein the determining step determines whether the engine temperature is less than a cold door threshold temperature, and if the determination is yes, setting the engine control mode to a cold car. Start mode. The vehicle idle speed control method according to claim 1, wherein the determining step is determined by the processing unit whether the engine temperature is less than a cold door threshold temperature, and if the determination is no, when the vehicle travels the speed reaches a specific At speed, set the engine control mode to the vehicle travel mode. The vehicle idle speed control method according to claim 2, wherein the voltage drop has a normal value of 3 volts. The vehicle idle speed control method according to claim 3, wherein the idle engine speed is 1800 r.p.m. The vehicle idle speed control method according to claim 3, wherein the normal working temperature of the engine is 70 degrees. The vehicle idle speed control method according to claim 3, wherein the vehicle stationary speed is 0 km/h. The vehicle idle speed control method according to claim 3, wherein the idle throttle opening value is 5%. The vehicle idle speed control method according to claim 3, wherein the static threshold time is 3 to 5 seconds. The vehicle idle speed control method according to claim 4, wherein the engine stationary speed is 0 r.p.m. The vehicle idle speed control method according to claim 7 or 8, wherein the cold door threshold temperature is 70 to 75 degrees. The vehicle idle speed control method according to claim 8 of the patent application, wherein the specific speed is 10 km/hour.