JP2010133364A - Engine automatic start-stop control device and engine automatic start-stop control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent an engine from being put in a state where an automatic start of the engine is impossible because a battery of a mobile device is run out and an ID authentication between the vehicle and the mobile device cannot be performed, in an engine automatic start-stop control device that, during a start of an engine of a vehicle, if a prescribed condition for stopping the engine is met, the engine is automatically stopped in response, and, after that, the engine is automatically restarted in response to a prescribed operation for restarting the engine. <P>SOLUTION: The engine automatic start-stop control device has a smart ignition function and an engine start or stop control system which can start or stop the engine with just a one-push operation. In the engine automatic start-stop control device, if communication with the mobile device is disrupted, an automatic stop of the engine is prohibited. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an engine automatic stop / start control device including an engine start / stop control system capable of starting / stopping an engine by a one-push operation, for example.

  Conventionally, the engine is automatically stopped in a situation where the vehicle is stopped because it is waiting for a signal, that is, under conditions where engine output is not required, and then the engine is automatically restarted when a predetermined condition requiring engine output is met. An apparatus that saves fuel and improves emissions by starting is known (for example, Patent Document 1).

Further, in recent vehicles, not only improvement in basic performance and safety, but also improvement in operability is required. Thus, for the purpose of improving the operability, engine start / stop control systems having a smart ignition function have been proposed (for example, Patent Document 2 and Patent Document 3). In this type of engine start / stop control system, when a portable device possessed by the owner (driver) enters the vehicle compartment, the portable device and the engine control are automatically performed between the engine control device disposed in the vehicle. An authentication process is performed by mutual communication with the apparatus, and the engine can be started on condition that the authentication process is established. An engine start process and a stop process can be performed by operating a start / stop operation unit provided in the vehicle compartment. In other words, the driver does not have to perform a troublesome operation of getting on the vehicle and inserting the key into the key cylinder, thereby ensuring security and improving operability.
JP 2003-148314 A JP 2001-289142 A JP 2001-31333 A

When the smart ignition function of paragraph [0003] is mounted on the control device for automatic engine stop / automatic start described in paragraph [0002], the engine automatically stops after the predetermined condition is satisfied, and then the predetermined start condition is satisfied. If the battery of a portable device with a smart ignition function runs out when the engine is automatically started (including the state where the battery capacity is low and communication is not possible), the portable device and the engine control unit communicate with each other. Cannot be done. That is, there is a prisoner that authentication processing cannot be performed between the portable device and the engine control unit, and the engine cannot be automatically started after the engine is automatically stopped.

  In such a case, when the engine is automatically started after the engine is automatically stopped, it is sufficient to start the engine without performing authentication processing between the portable device and the engine control unit. Since authentication processing is not performed on the vehicle side, security (vehicle theft) is lacking.

  The present invention has been made paying attention to this point, and in a vehicle having a smart ignition function, an engine automatic stop / start control device and an engine automatic control that enable automatic engine stop / start control while ensuring security. An object is to provide a stop-start method.

The invention of claim 1 is a vehicle control device that permits engine start on condition that authentication processing has been established by mutual communication with a portable device, in response to a predetermined stop condition during engine start. An engine automatic stop start determining unit for automatically stopping the engine and automatically starting the engine in response to a predetermined start operation after the engine is automatically stopped, the engine automatic stop start determining unit being The gist is to prohibit the automatic stop of the engine when mutual communication with the aircraft is interrupted.
The invention of claim 2 is a vehicle control device that permits the engine to start on the condition that the authentication process is established by mutual communication with the portable device, and responds to a predetermined stop condition while the engine is starting. An engine automatic stop start determining unit for automatically stopping the engine and automatically starting the engine in response to a predetermined start operation after the engine is automatically stopped, the engine automatic stop start determining unit being The gist is to prohibit the automatic stop of the engine when it is detected that the battery capacity of the machine is below a predetermined value.

  The invention of claim 3 is a vehicle control device that permits engine start on condition that authentication processing has been established by mutual communication with a portable device, in response to a predetermined stop condition during engine start. An engine automatic stop start determining unit for automatically starting the engine in response to a predetermined start operation after the engine is automatically stopped, and the engine automatic stop start determining unit is configured to The gist is to prohibit the automatic stop of the engine when it is detected that the battery capacity of the portable device is a predetermined value or less.

  The invention of claim 4 is a vehicle control device that permits the engine to start on the condition that the authentication process is established by mutual communication with the portable device, and responds to a predetermined stop condition during the start of the engine. An engine automatic stop start determining unit for automatically starting the engine in response to a predetermined start operation after the engine is automatically stopped, and the engine automatic stop start determining unit is configured to The gist is to automatically start the engine when it is detected that the battery capacity of the portable device is equal to or less than a predetermined value.

The invention of claim 5 is a vehicle control device that permits engine start on condition that authentication processing has been established by mutual communication with a portable device, in response to a predetermined stop condition during engine start. An engine automatic stop start determining unit for automatically starting the engine in response to a predetermined start operation after the engine is automatically stopped, the engine automatic stop start determining unit being When the engine is automatically started in response to the start operation of the vehicle, even if the mutual communication with the portable device is interrupted, it is determined that the possibility of vehicle theft is low, the engine is not used regardless of the authentication process. The gist is to allow automatic starting of
The sixth aspect of the invention is to secure the security according to the fifth aspect, in which the door unlocking operation is not performed during a predetermined start operation after the engine is automatically stopped.
According to a seventh aspect of the present invention, when the engine is automatically started by a predetermined starting operation after the automatic stop of the engine according to the first to sixth aspects, it is detected that the rotational speed of the engine has become a predetermined value or more. Then, the gist of performing the authentication process by mutual communication with the portable device.

The gist of the invention of claim 8 is that the battery capacity of the portable device according to claims 2 to 4 is determined from the battery voltage of the portable device received by communication from the portable device.
The gist of the invention of claim 9 is that the battery capacity of the portable device according to claims 2 to 4 is determined from the strength of the radio wave received from the portable device.

  According to the first aspect of the present invention, when the mutual communication between the portable device and the vehicle control device is interrupted while the engine is starting, automatic engine stop is prohibited. That is, when the engine is automatically restarted after the engine has been automatically stopped, the portable device and the vehicle control device cannot be authenticated by mutual communication, and cannot be automatically started after the engine is automatically stopped. Can be avoided.

  According to the second aspect of the present invention, when it is detected that the battery capacity of the portable device is equal to or less than a predetermined value during engine startup, automatic engine stop is prohibited. That is, when the engine is automatically restarted after the engine is automatically stopped, the authentication of the portable device and the vehicle control device is performed by mutual communication because the portable device has run out of battery (including a low battery capacity and communication disabled state). It is possible to avoid a situation where the processing cannot be performed and the automatic starting cannot be performed after the engine is automatically stopped.

  According to the invention described in claim 3, when it is detected that the battery capacity of the portable device is equal to or less than a predetermined value during the automatic stop of the engine, the automatic stop of the engine is prohibited. That is, when the engine is automatically stopped and then automatically restarted, the authentication process by mutual communication is performed between the portable device and the vehicle control device because the portable device has run out of battery (including a state in which communication is not possible due to low battery capacity). Before falling into a situation where it is impossible, it is possible to prohibit the automatic stop of the engine and automatically start the engine.

  According to the invention described in claim 4, when it is detected that the battery capacity of the portable device is equal to or less than a predetermined value during the automatic stop of the engine, the engine is automatically started. That is, when the engine is automatically stopped and then automatically restarted, the authentication process by mutual communication is performed between the portable device and the vehicle control device because the portable device has run out of battery (including a state in which communication is not possible due to low battery capacity). It is possible to automatically start the engine before falling into a situation where it is impossible.

  According to the fifth aspect of the present invention, when mutual communication with the portable device is interrupted when the engine is automatically started in response to a predetermined start operation after the engine is automatically stopped, the security of the vehicle is ensured. If so, the engine is allowed to start automatically. That is, even when authentication processing cannot be executed between the portable device and the vehicle control device, if security is ensured, the engine is allowed to start when the engine is automatically started after the engine is automatically stopped. That is, when security can be ensured, the engine can be automatically started after the engine is automatically stopped, and it is possible to avoid being unable to run.

  According to the sixth aspect of the present invention, security can be ensured when the door unlocking operation is not performed during a predetermined starting operation after the engine is automatically stopped. That is, if there is no person entering or leaving the vehicle interior, security can be ensured even if the engine is started.

  According to the seventh aspect of the present invention, when the engine is automatically started by a predetermined starting operation after the automatic stop of the engine, the communication with the portable device is detected after detecting that the engine speed has exceeded a predetermined value. The authentication process is executed by That is, when an automatic start processing request is made from the vehicle, the portable device transmits a predetermined ID code, so that the authentication processing can be surely executed between the portable device and the vehicle control device when the engine is started. And security is improved.

  According to the invention of claim 8, the battery capacity of the portable device is determined from the battery voltage of the portable device received from the portable device by communication. In other words, the battery voltage sensed on the portable device side is communicated to the vehicle control device by communication, so that the battery capacity of the portable device can be properly detected and the engine automatic stop / start control can be performed. .

  According to the invention of claim 9, the battery capacity of the portable device is determined from the strength of the radio wave received from the portable device. That is, there is no need to send battery voltage data by communication, and a sensor for measuring the battery voltage on the portable device side is not required, and the cost can be reduced from the eighth aspect.

Next, an embodiment of the present invention will be described in detail with reference to FIGS.
As shown in FIG. 1, the vehicle 9 includes a vehicle control device 6 (a collation control unit 1, an engine control unit 2, an air conditioner control unit 3, a body control unit 4, a transmission / reception unit 5, communication lines 7 and 8). ). Further, the vehicle control device 6 controls the vehicle 9 by collating the portable device 10 with the ID code.

  The portable device 10 is carried by the owner (driver) and can communicate with the vehicle control device 6 (specifically, the transmission / reception unit 5). Specifically, when receiving the ID code request signal 13 output from the vehicle 9, the portable device 10 automatically transmits a predetermined ID code 12 by radio. The ID code 12 is transmitted as a radio wave (ID code signal 14) having a predetermined frequency (for example, 300 MHz).

  The vehicle control device 6 includes a transmission / reception unit 5, a verification control unit 1, an engine control unit 2, an air conditioner control unit 3, and a body control unit 4. The control units 1 to 4 are electrically connected by communication lines 7 and 8.

  Moreover, each control part 1-4 is comprised by CPU unit which consists of CPU, ROM, and RAM, as shown in FIG.

  Next, control for starting the engine by the driver operating the start / stop SW 101 provided in the passenger compartment will be described. In the present embodiment, the start / stop SW 101 is connected as an input signal 21 to the engine control unit 2. The start / stop SW 101 is constituted by a momentary push button switch. First, the engine control unit 2 transmits a verification confirmation request signal 120 to the verification control unit 1 in response to the pressing operation signal input from the start / stop SW 101.

  The verification control unit 1 outputs an ID code request signal 151 to the transmission / reception unit 5. The transmission / reception unit 5 modulates the ID code request signal 151 output from the verification control unit 1 into a radio wave having a predetermined frequency (for example, 134 kHz) and outputs the ID code request signal 13 to the vehicle compartment. Further, when receiving the ID code signal 14 transmitted from the portable device 10, the transmission / reception unit 5 demodulates the ID code into a pulse signal and outputs it to the verification control unit 1 (ID code reception signal 150).

  When the ID code reception signal 150 is input from the transmission / reception unit 5, the verification control unit 1 compares the ID code included in the ID code reception signal with the ID code set in advance (ID code verification). . As a result, when the ID codes match, the collation control unit 1 transmits a collation establishment signal 126 to the engine control unit 2. When the ID codes do not match, the collation control unit 1 transmits a collation failure signal 127 to the engine control unit 2.

  When the engine control unit 2 receives the collation establishment signal 126, it drives the engine starter motor 113, drives the injector 110 and the igniter 111, performs injection and ignition, and starts the engine. Further, the engine control unit 2 stops driving the engine starter motor 113 when detecting that the engine speed has become equal to or higher than a predetermined speed based on an input from the engine speed sensor 106, and performs engine independent operation only with the engine. Do. The engine self-sustained operation is a state in which the engine is driven by a fuel explosion without using power from outside the engine unlike an engine starter motor. Further, when the engine control unit 2 receives the verification mismatch signal 127, the engine control unit 2 prohibits driving of the engine starter motor 113, the injector 110, and the igniter 111. Further, when the engine control unit 2 detects that a pressing operation signal is input from the start / stop SW 101 during engine start, the engine control unit 2 stops driving the injector 110 and the igniter 111.

Next, engine automatic stop / automatic start will be described in detail with reference to FIG.
Conventionally, the engine control unit 2 automatically stops the engine (step S10) in response to a predetermined stop condition (conditions satisfying steps S2, S3, S4, S5, S6, and S7) during engine startup. However, in the present invention, the engine control unit 2 is not disconnected from the portable device other than the predetermined stop condition (conditions satisfying steps S2, S3, S4, S5, S6, and S7) (step S8). Or it is set as the structure which permits the automatic stop of an engine with reference to the conditions of whether the battery voltage of a portable machine has fallen to below predetermined value (step S9). Here, when the battery voltage in step S9 is equal to or lower than the predetermined value, it is preferable to set the battery capacity that can be verified at a minimum.

  Here, the process of step S8 as to whether communication with the portable device 10 is not interrupted is not shown in FIG. 3, but indicates whether the transmission / reception unit 5 and the portable device 10 are in a communicable state. That is, the communication interruption state refers to a state in which the transmission / reception unit 5 cannot receive transmission data from the portable device 10.

Further, the process of determining whether or not the battery voltage of the portable device 10 is equal to or lower than the predetermined value is not illustrated in FIG. 3, but the portable device 10 is provided with a sensor or the like that detects the voltage of the battery 11 of the portable device 10. The portable device 10 transmits the sensed battery voltage value to the transmission / reception unit 5 as data different from the ID code signal 14, and the battery voltage value is transmitted to the engine control unit 2 via the communication lines 7 and 8. The In this way, the engine control unit 2 can check whether the battery voltage value is equal to or less than a predetermined value.
Further, instead of step S8, the transmission / reception unit 5 may measure the radio wave intensity from the portable device 10 and prohibit the automatic stop of the engine if the radio wave intensity is equal to or less than a predetermined value.

Further, conventionally, the engine control unit 2 performs ID collation (step S21) with the portable device in response to a predetermined start operation (steps S13, S14, S15, S16, S17, S18) after the engine is automatically stopped. If the verification is successful, the engine is automatically started. That is, in step S13, when it is detected that the vehicle has moved, the engine is automatically started. The detection of whether the vehicle has moved may be determined by a signal from the vehicle speed sensor 105. In step S14, when it is detected that the accelerator is stepped on by the driver, the engine is automatically started. Detection of whether or not the accelerator is stepped on may be determined from the accelerator sensor 103. In step S15, when it is detected that the driver releases the brake, the engine is automatically started. The brake pedal force may be determined from the brake pressure sensor 104. In step S16, when it is detected that the brake negative pressure is insufficient, the engine is automatically started. The detection of the brake negative pressure may be determined from the intake manifold pressure sensor 109. When the engine start request signal 124 in step S17 is input, the engine is automatically started.
Here, the engine start request signal 124 is a signal created by the air conditioner control unit 3. For example, when the air conditioner temperature setting SW 133 is set to the heating side and the heater temperature 135 is detected to be low, the air conditioner control unit 3 requests the engine control unit 2 to start the engine in order to increase the heater temperature. Signal 124 is transmitted.

  In the present invention, the engine is automatically started when it is detected that the voltage of the battery 11 of the portable device 10 is not more than a predetermined value during the automatic engine stop (step S20). Of course, the ID collation (step S19) with the portable device 10 is also performed at this time, and if the collation is established, the injection and ignition operations are continuously permitted. Here, when the battery voltage in step S20 is equal to or lower than a predetermined value, it is preferable to set the battery capacity to allow a minimum verification.

  Furthermore, when the engine is automatically started (step S24) in response to a predetermined engine start condition (steps S13, S14, S15, S16, S17, S18) after the engine is automatically stopped, communication with the portable device 10 is interrupted. If there is no door opening / closing history during automatic engine stop (step S22), automatic engine start (step S24) is permitted.

  Here, the door opening / closing history processing method in step S22 is that the body control unit 4 detects the history of the door opening / closing SW while the engine is automatically stopped, and transmits the door opening / closing history signal 125 to the engine control unit 2. Thus, the opening / closing history of the door can be determined. In other words, if there is no door opening / closing history, it is possible to determine that there is no possibility of a vehicle theft without the driver getting on and off.

  Although not shown in FIG. 3, the ID verification with the portable device 10 when the engine is automatically started after the engine is automatically stopped is a configuration in which the ID verification is performed after the engine speed becomes equal to or higher than a predetermined speed. It is good to. That is, when the conditions for automatically starting the engine are established in steps S13, S14, S15, S16, S17, and S18, the engine control unit 2 drives the engine starter motor 113 and drives the injector 110 and the igniter 111 to perform injection and Start ignition. If the ID verification with the portable device is performed after the engine rotation speed becomes equal to or higher than the predetermined rotation speed by the engine starting operation, the ID verification with the portable device 10 can be surely performed when the engine is automatically started. It becomes like this. Further, if the ID verification with the portable device 10 is performed only when the engine is started, an effect of extending the battery life of the portable device 10 can be obtained.

  Next, steps S25 to S28 will be described. Step S25 is a state in which the engine is not being started and the engine is not being automatically stopped, that is, the driver gets into the vehicle and starts the engine by pressing the start / stop SW. If the start / stop SW is pressed (YES) in step S25, ID verification is performed in step 26. If ID verification is OK (YES), the engine is started in step 27. If the ID verification is NG (NO), the engine is stopped in S28 and the engine is not started.

  4 to 7 show timing charts according to an embodiment of the present invention. FIG. 4 is a flowchart of engine processing when there is no abnormal operation (when communication is not interrupted). At t1, the driver gets into the vehicle, and the authentication OK flag is turned on by the vehicle electronic control device 6 and the portable device 10. At t2, the driver stamps the start / stop SW, and the engine starts. At t3, the conditions of S2 to S8 in FIG. 3 are satisfied and the engine is automatically stopped. For example, by turning off the brake at t4, the condition of S4 is not satisfied, and the engine is automatically started. At t5, the engine speed becomes equal to or higher than the predetermined speed, the authentication process between the vehicle electronic control device 6 and the portable device 10 is performed, and authentication is OK. At t6, the driver stamps the start / stop switch to stop the engine. The driver gets off at t7.

FIG. 5 is an engine processing flow when a communication abnormality occurs during engine startup. If communication is interrupted during engine start (t13), the condition of S8 in FIG. 3 is not satisfied, and therefore the engine is not automatically stopped even if the conditions of S2 to S7 are satisfied.
FIG. 6 is a processing flow when communication is interrupted and the door is not unlocked during automatic engine stop. At t23, the conditions of S2 to S8 in FIG. 3 are satisfied and the engine is automatically stopped. At t24, communication between the vehicle control device 6 and the portable device 10 is interrupted. For example, by turning off the brake at t25, the condition of S4 is not satisfied, and the engine is automatically started. At t26, the engine reaches a predetermined rotational speed or higher and the vehicle control device 6 and the portable device 10 execute authentication processing. However, since the door is not unlocked while the engine is automatically stopped (between t23 and t26), it is assumed that security is ensured, and the authentication OK flag is turned on with a dummy and the engine start is continued.

  FIG. 7 is a processing flow when communication interruption occurs during automatic engine stop and the door is unlocked. At t33, the conditions of S2 to S8 in FIG. 3 are satisfied and the engine is automatically stopped. At t34, the driver unlocks the door. At t35, communication between the vehicle control device 6 and the portable device 10 is interrupted. For example, by turning off the brake at t36, the condition of S4 is not satisfied, and the engine is automatically started. At t37, the engine reaches a predetermined number of revolutions or more, and the authentication process is executed by the vehicle control device 6 and the portable device 10, but the authentication process is not established because communication is interrupted. Further, since the door is unlocked while the engine is automatically stopped (between t33 and t37), the engine is stopped by prohibiting automatic start of the engine, assuming that security is not secured. Even if the driver attempts to start the engine by tapping the start / stop SW at t38, the vehicle electronic control device 6 and the portable device 10 are not authenticated, so the engine start is not permitted. In such a case, if the battery of the portable device 10 runs out, the engine cannot be started even manually. Therefore, an emergency key cylinder is prepared, and the driver inserts the portable device into the key cylinder. If the configuration is such that the engine can be started, the engine can be started manually even when the battery of the portable device runs out.

It is a block diagram which shows the schematic of the engine automatic stop start control apparatus which is one Example of this invention. It is a block diagram which shows the schematic of the engine automatic stop start control apparatus which is one Example of this invention. It is a block diagram which shows the slow chart of the engine automatic stop start control apparatus which is one Example of this invention. Engine processing flow according to one embodiment of the present invention (when there is no abnormality) Engine processing flow according to an embodiment of the present invention (when communication abnormality occurs during engine startup) Engine processing flow according to an embodiment of the present invention (when communication is interrupted and the door is not unlocked during automatic engine stop) Engine processing flow according to an embodiment of the present invention (when communication is interrupted and the door is unlocked during automatic engine stop)

Explanation of symbols

1: collation control unit 2: engine control unit 3: air conditioner control unit 4: body control unit 5: transmission / reception unit 6: vehicle control device 7: communication line 8: communication line 9: vehicle 10: portable device 11: battery 12: ID Code (mobile device side)
21: Input signal to engine control unit 22: Output signal of engine control unit 23: Input signal of air conditioner control unit 24: Input signal of body control unit

Claims (10)

A vehicle control device that permits engine start on condition that authentication processing is established by mutual communication with a portable device,
An engine automatic stop start determination unit that automatically stops the engine in response to a predetermined stop condition during engine startup, and automatically starts the engine in response to a predetermined start operation after the engine is automatically stopped,
The engine automatic stop / start determination unit prohibits the automatic stop of the engine when mutual communication with the portable device is interrupted during engine startup. A vehicle control device that permits engine start on condition that authentication processing is established by mutual communication with a portable device,
An engine automatic stop start determination unit that automatically stops the engine in response to a predetermined stop condition during engine startup, and automatically starts the engine in response to a predetermined start operation after the engine is automatically stopped,
The engine automatic stop start determination unit prohibits automatic engine stop when detecting that the battery capacity of the portable device is equal to or less than a predetermined value during engine start. A vehicle control device that permits engine start on condition that authentication processing is established by mutual communication with a portable device,
An engine automatic stop start determination unit that automatically stops the engine in response to a predetermined stop condition during engine startup, and automatically starts the engine in response to a predetermined start operation after the engine is automatically stopped,
The engine automatic stop start determination unit prohibits automatic engine stop when detecting that the battery capacity of the portable device is equal to or less than a predetermined value during automatic engine stop. . A vehicle control device that permits engine start on condition that authentication processing is established by mutual communication with a portable device,
An engine automatic stop start determination unit that automatically stops the engine in response to a predetermined stop condition during engine startup, and automatically starts the engine in response to a predetermined start operation after the engine is automatically stopped,
The engine automatic stop / start determining unit automatically starts the engine when detecting that the battery capacity of the portable device is equal to or less than a predetermined value during the automatic stop of the engine. A vehicle control device that permits engine start on condition that authentication processing is established by mutual communication with a portable device,
An engine automatic stop start determination unit that automatically stops the engine in response to a predetermined stop condition during engine startup, and automatically starts the engine in response to a predetermined start operation after the engine is automatically stopped,
The engine automatic stop / start determination unit is capable of vehicle theft even when mutual communication with the portable device is interrupted when the engine is automatically started in response to a predetermined start operation after the engine is automatically stopped. When it is determined that the engine performance is low, automatic start of the engine is permitted regardless of the authentication process.   6. The vehicle control device according to claim 5, wherein the possibility of theft of the vehicle is low that the door unlocking operation is not performed during a predetermined start operation after the engine is automatically stopped.   When the engine is automatically started by a predetermined starting operation after the engine is automatically stopped, an authentication process is performed through mutual communication with the portable device after detecting that the engine speed has exceeded a predetermined value. The vehicle control device according to claim 1, wherein the vehicle control device is a vehicle control device.   The vehicle control device according to claim 2, wherein the battery capacity of the portable device is determined from the battery voltage of the portable device received from the portable device by communication.   The vehicle control device according to claim 2, wherein the battery capacity of the portable device is determined from the strength of radio waves received from the portable device. A vehicle control method for permitting engine start on condition that authentication processing is established by mutual communication with the portable device,
An engine automatic stop start determination step for automatically stopping the engine in response to a predetermined stop condition during engine start, and automatically starting the engine in response to a predetermined start operation after the engine is automatically stopped;
The engine automatic stop / start determination step is a vehicle control method that prohibits automatic engine stop when mutual communication is interrupted with the portable device during engine start.

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