CN110023169B - Method for preventing driver from driving vehicle during intoxication - Google Patents

Abstract

The present disclosure relates to preventing a driver (304) from driving a vehicle (100) while intoxicated by analyzing driver interactions performed by the driver (304) using a human machine interface (HMI) (202) included in the vehicle (100, 102). , 102) method. The present disclosure also relates to a control unit (202) adapted to perform the method, and a corresponding computer program product.

Description

Ways to prevent drivers from driving while intoxicated

technical field

The present disclosure relates to a method of preventing a driver from driving a vehicle while intoxicated by analyzing driver interactions performed by the driver using a human-machine interface (HMI) included in the vehicle. The present disclosure also relates to a control unit and a corresponding computer program product adapted to perform the method.

Background technique

Drunk driving is still a problem in modern society. One way to combat drunk driving is to install alcohol breath detector devices in the vehicles of repeat offenders. These devices require the driver to blow air into the blowpipe before operating the vehicle. When a blood alcohol content (BAC) above a predetermined legal level is detected, a violation is recorded and, in some cases, prevented from vehicle operation. In some embodiments, the vehicle can be prevented from starting when the driver is intoxicated by connecting the alcohol breath detector device to the vehicle's ignition system.

Unfortunately, such breathalyzer devices can be circumvented, for example, by having a sober person who is not the driver take the breathalyzer test. Alternatively, a device such as an air pump can be used to "trick" the alcohol breath detector device. In addition, installing an alcohol breath detector device into a vehicle certainly comes at a cost, due to the cost of the alcohol breath detector device itself and the possible cost of maintaining the alcohol breath detector device.

US20120112879 attempts to overcome the above-mentioned problems associated with the use of alcohol breath detector devices to prevent drivers from driving the vehicle while intoxicated. In particular, according to US20120112879, it is possible to use the driver's speech analysis to determine whether the driver is intoxicated, eg due to drinking alcohol. Muffled speech has long been considered an indication of intoxication and is often used by law enforcement. It is also recognized that alcohol consumption has an effect on certain phonological parameters of speech. Additionally, US20120112879 discloses that the driver can be asked to perform tasks that are normally performed by the driver during the normal course of vehicle use. For example, the driver of a car could be asked to honk the horn, turn on the radio, select a station on the radio, turn on the high beams, turn on the emergency double flasher, or depress the brake pedal.

Although US20120112879 provides an interesting method for detecting if a driver is intoxicated without using an alcohol breath detector device, the proposed solution will only allow driving to be determined with low certainty the level of intoxication of the staff. Therefore, it would be desirable to provide further enhancements to improve the reliability of determining a driver's intoxication level.

SUMMARY OF THE INVENTION

According to an aspect of the present disclosure, the above-described problems are at least partially mitigated by a method of preventing a driver from driving a vehicle while intoxicated, the method comprising the steps of: receiving an indication at a control unit included in the vehicle that the driver initiates a driving session ; providing instructions to the driver to perform a predetermined set of actions using a human machine interface (HMI) included in the vehicle in response to receiving the driving session initiation instruction; after providing the instructions, the control unit sends the driver to use The interaction by the HMI is compared with said predetermined set of actions; the control unit determines whether the result of the comparison step indicates that the driver is in an unacceptably intoxicated state; and, if the determined result indicates that the driver is in an unacceptably intoxicated state , the control unit makes the vehicle immobile.

According to the present disclosure, when the driver wants to start driving, whereby the control unit receives an indication from the driver to initiate a driver session, possibly (sometimes) a test to determine if the driver is in an unacceptably intoxicated state. Specifically, in accordance with the present disclosure, the driver is required to successfully perform a test that includes a series of actions/manipulations using existing human-machine interface (HMI) components in the vehicle, such as paddle switches, other switch, accelerator pedal, etc. The driver will be required to perform a series of actions that require operating some of these HMI components. It will be appreciated that the driver may initiate driving by, for example, activating the ignition switch to start the vehicle (using, for example, the ignition key or the start button).

Advantageously, said predetermined set of actions of the HMI component is based on behavioural studies of the cognitive and physical abilities of persons who have consumed alcohol or other drugs. Thus, the predetermined set of actions may be specific to different situations, possibly to the driver's (known) prior behavior, based on tests for different types of intoxication. That is, if the driver is known to have driven under the influence of alcohol in previous circumstances, the test could be specifically aimed at identifying whether the driver is under the influence of alcohol. In a corresponding manner, if the driver is known to have previously abused other types of drugs, the test can be targeted accordingly. In addition, tests can often be arranged to screen for any form of intoxication.

In an embodiment of the present disclosure, the instructions provided to the driver are at least one of audio instructions and visual instructions. It is of course possible to provide the driver with a combination of both audio and visual instructions. Audio instructions are provided using speakers, and visual instructions are provided on the display member. For example, a speaker/display member arranged in the cabin of the vehicle can be used. Alternatively, the speaker/display member is provided as a component included in a mobile electronic device, such as a driver's mobile phone or a wearable device (eg a smart watch) worn by the user.

Preferably, the series of driver interactions are performed using driver control means included in the HMI, the driver control means comprising at least one of the following: a paddle switch, an electrical switch, an accelerator pedal, a brake pedal, a clutch pedal, Shifter, steering wheel, auxiliary brake handle, input controls for vehicle accessories. In particular embodiments, the predetermined set of actions includes at least two actions performed simultaneously using different types of driver control members. By requiring the driver to perform simultaneous actions, the driver's intermediate coordination ability can be determined, wherein a relatively low (eg, below a predetermined threshold) intermediate coordination ability may be considered an indication that the driver is in an unacceptably intoxicated state.

According to the present disclosure, the HMI can also be allowed to include at least one of a microphone and a touchpad (or the like) for receiving driver interactions. For example, in one embodiment, the instruction provided to the driver may be to observe the output from a tachometer disposed within an instrument cluster included in the vehicle, and the driver interaction may be (to the microphone)" Say" or enter (using the touchpad) the observation of the current revolutions per minute (RPM) indicated at the tachometer. Accordingly, driver interactions using the vehicle's HMI may also (or alternatively) include driver-provided, spoken, or "typed" information.

Additionally, in one embodiment, coordination between visually provided information and user interaction may be tested. That is, according to the present disclosure, it is possible to verify that the driver understands the information in the instrument cluster by instructing the driver to visually observe the intermediate RPM displayed, for example, at the tachometer, and then control the "level" at the accelerator pedal in order to "keep" a specific RPM. If the driver has trouble reading, he will thus not be able to keep the RPM of the tachometer at the required level. For example, similar implementations are possible for other types of information displayed within the instrument cluster, such as reading pressure or the like.

In a possible embodiment of the present disclosure, the HMI included in the vehicle may additionally be used, making it suitable for allowing the driver to interact with his mobile electronic device, possibly by means of typical sensors included in such a mobile electronic device (which may include accelerometer, etc.) to achieve the possibility of further testing.

In one embodiment, the method further comprises the step of determining, by the control unit, the condition of the vehicle, wherein said steps of receiving, controlling, comparing, determining and immobilizing the vehicle are performed only when the condition of the vehicle meets predetermined criteria. That is, the test for determining whether the driver is intoxicated does not necessarily have to be performed every time the driver starts to drive the vehicle. Rather, the tests may, for example, be restricted to be performed at certain times of the day (eg, during evening/night hours), or if the vehicle is determined to be within a particular geographic area. Such areas may be defined, for example, in a manner similar to the previously known "geofencing" concept. For example, if a vehicle is determined to be within an area known to have a high statistic of (captured) intoxicated drivers, such criteria may be used to initiate a driver intoxication test according to the present disclosure. Similarly, where the vehicle has been parked near a liquor store, this knowledge can be used to initiate testing. It will be appreciated that the "reason" for initiating a driver intoxication test may vary from driver to driver, eg depending on whether the driver has previously been determined to be in a possible or unacceptable state of intoxication.

Additionally, in accordance with the present disclosure, behavioral data related to the driver can be collected to identify how the driver typically acts, eg, how he gets into the truck, controls different HMI components, how he schedules timing during general vehicle handling Wait. If deviations from normal patterns are observed, a driver intoxication test can be initiated. In addition to the above, the test may be triggered when no forced action is performed before attempting to start the vehicle (ie, initiating a driver session as described above), eg without wearing its seat belt.

Preferably, the method further comprises determining, by the control unit, the identity of the driver, wherein the steps of receiving, controlling, comparing, determining and immobilizing the vehicle are performed only if the driver is identified as the correct driver. Thus, for example, the vehicle may be equipped with means for obtaining biometric data about the driver (including fingerprint matching, facial recognition, etc.).

In a possible embodiment of the present disclosure, the actions included in the set of actions to be performed by the driver are randomly selected. That is, it is preferable that the driver cannot learn a specific pattern of successfully passing the test even while intoxicated. Thus, the actions included in the set of actions to be performed by the driver are different each time the steps of receiving, controlling, comparing, determining and immobilizing the vehicle are performed.

According to a preferred embodiment of the present disclosure, the instruction to perform a predetermined set of actions includes at least one implicit instruction. That is, instead of providing explicit instructions to the driver, such as instructing the driver to turn the steering wheel while pressing the brake pedal with their foot, an implicit instruction is provided to the driver, such as instructing the driver to place the shift lever in the specific location. In order to place the shift lever correctly in a specific position, the driver must first depress the clutch pedal with his foot before being able to change the shift lever to a specific position. In a corresponding manner, with the radio off, the implicit instruction given to the driver may be to tune the radio to a specific station. However, to successfully perform the required action, the driver must first turn on the radio of course. Therefore, the predetermined set of actions will also include implicit actions. It should be understood that implicit and explicit actions can be combined. Additionally, if it is determined that the driver is not performing as intended by the implicit conditions involved, then the test will not only be considered a failure (start disallowed), but the test will become more difficult on subsequent attempts.

According to the present disclosure, reference data to be used in the step of comparing the actions performed by the driver with the predetermined set of actions can be formed before the driver intoxication test is performed. The reference data may be collected during normal operation of the vehicle during periods of time to ensure that the driver will not be in an unacceptably intoxicated state. Thus, behaviors related to, for example, how the driver manipulates the steering wheel, shifts (combination of clutch, shift lever and accelerator pedal), etc., can be collected. The collected data can then be compared with the actual performance of the driver while performing the test. The reference data may be driver-specific alone, or may be related behaviors related to how multiple drivers behave when performing a set of actions in a non-intoxicated state.

Within the scope of the present disclosure, it will of course be possible to form reference data also related to the behavior of drunk drivers. Thus, during a driver intoxication test, a comparison can be made with such reference data in determining whether the driver is considered intoxicated.

In a possible implementation of the present disclosure, it may be desirable for the control unit to estimate the driver's intoxication value based on the result of the comparison step and possibly to send information indicative of the result of the comparison step to a person associated with the driver. Accordingly, the driver's supervisor (or police) may be adapted to receive notification in the event that the driver is determined to be in an unacceptably intoxicated state, so that further appropriate action may be taken.

According to another aspect of the present disclosure, there is provided a control unit included in a vehicle, the control unit being adapted to prevent a driver from driving the vehicle while intoxicated, wherein the control unit is further adapted to: receive a driver-initiated driving session instructing; providing instructions to the driver to perform a predetermined set of actions using a human machine interface (HMI) included in the vehicle; after providing the instructions, comparing the driver's interactions using the HMI with the predetermined set of actions; determining whether the result of the comparing step indicates that the driver is in an unacceptably intoxicated state; and, if the determined result indicates that the driver is in an unacceptably intoxicating state, immobilizing the vehicle. This aspect of the present disclosure provides similar advantages as discussed above with respect to the previous aspect of the present disclosure.

In one embodiment, the control unit may be an electronic control unit (ECU) typically provided as an onboard component of a vehicle such as a bus, truck, car or any form of construction equipment. The vehicle preferably includes an engine and the HMI described above.

According to another aspect of the present disclosure, there is provided a computer program product comprising a non-transitory computer-readable medium on which is stored a computer program for operating a control unit of a vehicle an assembly, the control unit adapted to prevent a driver from driving a vehicle while intoxicated, wherein the computer program product comprises: code for receiving at the control unit an indication of the driver initiating a driving session; for providing, by the control unit, the instruction to the driver code to perform a predetermined set of actions using a human machine interface (HMI) included in the vehicle; for comparing, by the control unit, the driver's interaction using the HMI with the predetermined set of actions after said instructions are provided a code for determining, by the control unit, whether the comparison indicates that the driver is in an unacceptably intoxicated state; and a code for immobilizing the vehicle by the control unit if the determined result indicates that the driver is in an unacceptably intoxicating state code. Furthermore, this aspect of the present disclosure provides similar advantages as discussed above with respect to the preceding aspects of the present disclosure.

The computer-readable medium can be any type of storage device, including one of the following: removable non-volatile random access memory, hard drive, floppy disk, CD-ROM, DVD-ROM, USB memory, SD memory card, or similar computer readable medium known in the art.

Other advantages and advantageous features of the present disclosure are disclosed in the following description and dependent claims.

Description of drawings

With reference to the accompanying drawings, the following is a more detailed description of embodiments of the present disclosure cited by way of example.

In these figures:

FIG. 1A shows a truck, and FIG. 1B shows a bus in which a method of immobilizing a vehicle according to the present disclosure may be incorporated;

FIG. 2 conceptually shows the interrelationship among an electronic control unit (ECU), a human machine interface (HMI), and an engine included in a vehicle.

FIG. 3 shows an exemplary vehicle cab provided with a human-machine interface (HMI) for performing a set of actions to be analyzed for possible intoxication of the driver, and

Figure 4 shows process steps for performing a method according to the present disclosure.

Detailed ways

The present disclosure will now be described more fully hereinafter with reference to the accompanying drawings, in which currently preferred embodiments of the disclosure are shown. This disclosure may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided for thoroughness and completeness, and to fully convey this disclosure to those skilled in the art range. The same reference numbers refer to the same elements throughout.

Referring now to the drawings, and in particular to FIGS. 1 and 2, an exemplary vehicle is depicted in FIG. 1A, shown here as a truck 100, in which a method of immobilizing a vehicle in accordance with the present disclosure may be incorporated 100 out of 100. This immobile approach can of course be implemented in a slightly different manner in a bus 102, a car, etc. as shown in Figure IB. The vehicle may for example be one of an electric vehicle or a hybrid vehicle, or possibly a natural gas/gasoline/diesel vehicle. The vehicle includes an electric machine (in the case of an electric vehicle or a hybrid vehicle) or an engine (eg, an internal combustion engine in the case of a natural gas/gasoline/diesel vehicle).

Referring further to FIG. 2, there is conceptually shown an electronic control unit (ECU) 200, components of a human machine interface (HMI) 202 (which serves as input for receiving driver interaction), a system for providing instructions to the driver The relationship between the output interface 204 and the engine 206 included in the vehicle 100 , 102 .

The ECU 200 may represent, for example, a general purpose processor, a special purpose processor, a circuit containing processing elements, a set of distributed processing elements, a set of distributed computers configured for processing, a field programmable gate array (FPGA), or the like. The processor may be or include any number of hardware components for performing data or signal processing or for executing computer code stored in memory. The memory may be one or more devices for storing data and/or computer code for performing or facilitating the various methods described in this specification. The memory may include volatile memory or non-volatile memory. The memory may include database components, object code components, script components, or any other type of information structure used to support the various activities of this specification. According to exemplary embodiments, any distributed memory device or local memory device may be used with the systems and methods of this specification. According to an exemplary embodiment, the memory is communicatively connected to the processor (eg, via a circuit or any other wired, wireless, or network connection) and includes a computer for performing one or more of the processes described herein code.

In the illustration provided in FIG. 2 , HMI 202 is shown to include paddle switch 208 , electrical switch 210 , accelerator pedal 212 , brake pedal 214 , clutch pedal 216 , shift lever 218 , steering wheel 220 , auxiliary brake A handle 222 , and input controls for vehicle accessories shown as an interface 224 for a radio module included in the vehicle 100 , 102 . The output interface 204 may be provided by one or a combination of, for example, a speaker 226 disposed within the vehicle (eg, used with the vehicle's radio module), a mobile phone 228 that may be wirelessly connected to the ECU 200 (using, eg, Bluetooth , Wi-Fi, etc.) and a wearable device 230 (eg, a smart watch) that may be wirelessly connected to the ECU 200 (or to the ECU 200 via the mobile phone 228 ) in a similar manner. Additionally, and as described above, the engine 206 may be a natural gas/gasoline/diesel engine or an electric engine.

In FIG. 3, an exemplary vehicle cab 302 is shown provided with a human-machine interface (HMI) for performing a set of actions to be analyzed for possible driving Staff drunk. According to the discussion in relation to FIG. 2 , the vehicle cab 302 is provided with an input interface 202 (ie, an HMI interface including a selection of the HMI components described above) and an output interface 204 . In the example shown, it has been determined that the vehicle is parked in a specific area where it is known (previous information) that a drunk driver has been observed. Thus, a driver intoxication test is initiated as soon as the ECU 200 indicates that the driver 304 wants to start the engine 206 of the vehicle 100, 102.

The ECU 200 will be wirelessly connected to the driver's smart watch 230, which will provide the driver with instructions to perform a predetermined set of actions using the HMI (specifically using the steering wheel 220, clutch pedal 216 and gear lever 218). For example, the ECU 200 may have previously identified that the shift lever 218 is in first gear. Thus, the driver can be instructed to shift to third gear (implicit command, where a combination of clutch pedal 216 and shift lever 218 is necessary) and then turn the steering wheel 1/4 turn (explicit command).

In this case, the driver may choose to turn the steering wheel 220 90 degrees to the left or 90 degrees to the right. Then, at a later point in time, a further implicit instruction may be to ask the driver to turn the steering wheel 220 an opposite 1/4 turn in the opposite direction than he did previously. Therefore, it will be possible to test the driver's intermediate memory ability.

In summary, the present disclosure relates to a method of preventing a driver from driving a vehicle while intoxicated, comprising: receiving, at a control unit included in the vehicle, an indication of S1 driver initiation of a driving session; The driver provides S2 instructions to perform a predetermined set of actions using a human machine interface (HMI) included in the vehicle. The method also includes: after the instruction is provided, comparing, by the control unit, the interaction performed by the driver using the HMI with the predetermined set of actions S3; determining by the control unit S4 whether the result of the comparing step indicates that the driver is in an unacceptably intoxicated state; and, if the result of the determination indicates that the driver 304 is in an unacceptably intoxicated state, the vehicle 100/102 is rendered immobile by the control unit S5. However, if it is determined that the driver 304 is not intoxicated (or at least not in an unacceptably intoxicated state, such as below a predetermined legal limit/level), then the vehicle 100/102 starts, S5'.

Advantages of the present disclosure include increased reliability in determining whether the driver is actually intoxicated by carefully adjusting how instructions are provided to the driver to perform the predetermined set of actions. Preferably, the instructions are given as implicit instructions such that further related tasks must be performed to correctly perform the predetermined set of actions.

The present disclosure contemplates methods, apparatus, and program products on any machine-readable medium to accomplish various operations. Embodiments of the present disclosure may be implemented using existing computer processors, or by special purpose computer processors incorporated for this purpose or another for an appropriate system, or by hardwired systems. Embodiments within the scope of the present disclosure include program products comprising a machine-readable medium for carrying or having machine-executable instructions or data structures stored on the machine-readable medium. Such machine-readable media can be any available media that can be accessed by a general purpose or special purpose computer or other machine with a processor.

Such machine-readable media can include, for example, RAM, ROM, EPROM, EEPROM, CD-ROM, or other optical, magnetic, or other magnetic storage devices, or can be used to carry or store machine-executable instructions or data structures any other medium in the form of desired program code that can be accessed by a general purpose or special purpose computer or other machine with a processor. When information is communicated or provided to a machine over a network or another communication connection (hardwired, wireless, or a combination of hardwired or wireless), the connection is properly considered a machine-readable medium. Thus, any such connection is properly termed a machine-readable medium. Combinations of the above are also included within the scope of machine-readable media. Machine-executable instructions include, for example, instructions and data that cause a general purpose computer, special purpose computer, or special purpose processing machine to perform a particular function or set of functions.

Although the figures may show a particular order of method steps, the order of the steps may differ from that depicted. Additionally, two or more steps may be performed concurrently or with partial concurrence. This variation will depend on the software and hardware systems chosen and the choice of the designer. All such variations are within the scope of this disclosure. Likewise, software implementations can be accomplished using standard programming techniques with rule-based logic and other logic to accomplish the various connection steps, processing steps, comparison steps, and decision-making steps. Additionally, although the present disclosure has been described with reference to specific exemplary embodiments thereof, many different changes, modifications, etc. will become apparent to those skilled in the art.

Variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed disclosure, from a study of the drawings, the disclosure, and the appended claims. Furthermore, in the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude a plurality.

Claims (13)

1. A method of preventing a driver (304) from driving a vehicle (100, 102) while intoxicated, the method comprising the steps of:

-receiving (S1), at a control unit (200) comprised in the vehicle (100, 102), an indication of the driver (304) initiating a driving session;

-in response to receiving a driving session initiation indication, providing (S2) instructions to the driver (304) to perform a predetermined set of actions using a Human Machine Interface (HMI) (202) comprised in the vehicle (100, 102);

-comparing (S3), by the control unit (200), the driver' S interaction with the HMI (202) with the predetermined set of actions after providing the instruction;

-determining (S4), by the control unit (200), whether the result of the comparing step indicates that the driver is in an unacceptable drunk state; and

-immobilizing (S5), by the control unit (200), the vehicle (100, 102) if the result of the determination indicates that the driver (304) is in an unacceptable intoxicated state,

the method is characterized in that:

-performing a series of driver interactions using driver control components comprised in the HMI (202), the driver control components comprising at least one of: a lever switch (208), an electrical switch (210), an accelerator pedal (212), a brake pedal (214), a clutch pedal (216), a shift lever (218), a steering wheel (220), an auxiliary brake handle (222), an input controller (224) for a vehicle accessory, the predetermined set of actions including at least two actions performed simultaneously using different types of driver control members, and the at least two actions performed simultaneously using different types of driver control members are performed by the driver (304) using at least one hand and one leg, or

-one of the set of actions comprises keeping the engine at a predetermined number of revolutions per minute (rpm), or

-the instruction for performing a predetermined set of actions comprises at least one implicit instruction, and a first component is a shift lever (218) and a second component is a clutch pedal (216), wherein the implicit instruction requires the driver to operate both the first and second components to perform the predetermined set of actions,

wherein the method further comprises the step of determining a vehicle condition by the control unit (200),

wherein:

-performing the above steps of receiving, controlling, comparing, determining and immobilizing the vehicle only if the vehicle condition meets a predetermined criterion,

-the vehicle condition is a predetermined test interval for the driver of the vehicle, and

-said predetermined criterion is a current state within said test interval.

2. The method of claim 1, wherein the instructions provided to the driver (304) are at least one of audio instructions and visual instructions, or the instructions provided to the driver (304) are both audio instructions and visual instructions.

3. The method of claim 2, wherein the audio instructions are provided using a speaker and the visual instructions are provided on a display member.

4. The method of claim 3, wherein at least one of the speaker and the display member is provided as a component disposed within a cab of the vehicle.

5. The method of claim 3, wherein at least one of the speaker and the display member is provided as a component included in a mobile electronic device (204).

6. The method of claim 5, wherein the mobile electronic device (204) is at least one of a mobile phone (228) and a wearable electronic device (230) operated by the driver (304).

7. The method of claim 1, wherein the test interval is:

-is independent for each driver (304), or

-depending on a previous determination that the driver is intoxicated.

8. The method of claim 1, further comprising the steps of:

-determining, by the control unit (200), an identity of the driver (304),

wherein the steps of receiving, controlling, comparing, determining, and immobilizing the vehicle are performed only if the driver is identified as the correct driver.

9. The method of claim 1, wherein the step of determining that the driver (304) is in an unacceptably drunk state comprises the step of comparing a duration for performing the set of actions to a predetermined threshold.

10. The method of claim 1, further comprising the steps of:

-sending information indicative of the result of the comparing step to an individual associated with the driver.

11. A control unit (200) comprised in a vehicle (100, 102), the control unit (200) being adapted to prevent a driver (304) from driving the vehicle when intoxicated, wherein the control unit (200) is further adapted to:

-receive an indication that the driver (304) initiates a driving session;

-providing instructions to the driver (304) to perform a predetermined set of actions using a Human Machine Interface (HMI) (202) comprised in the vehicle (100, 102);

-after providing the instruction, comparing the driver's interaction using the HMI (202) with the predetermined set of actions;

-determining whether the result of the comparing step indicates that the driver (304) is in an unacceptable intoxicated state; and

-making the vehicle (100, 102) immovable if the result of the determination indicates that the driver (304) is in an unacceptably intoxicated state,

the method is characterized in that:

-performing a series of driver interactions using driver control components comprised in the HMI (202), the driver control components comprising at least one of: a stick switch (208), an electrical switch (210), an accelerator pedal (212), a brake pedal (214), a clutch pedal (216), a shift lever (218), a steering wheel (220), an auxiliary brake handle (222), an input controller (224) for a vehicle accessory, the predetermined set of actions including at least two actions performed simultaneously using different types of driver control members, and the at least two actions performed simultaneously using different types of driver control members being performed by the driver (304) using at least one hand and one leg, or

-one of the set of actions comprises keeping the engine at a predetermined number of revolutions per minute (rpm), or

-the instruction for performing a predetermined set of actions comprises at least one implicit instruction, and a first component is a shift lever (218) and a second component is a clutch pedal (216), wherein the implicit instruction requires the driver to operate both the first and second components to perform the predetermined set of actions,

wherein a vehicle condition is determined by the control unit (200),

wherein:

-performing the above steps of receiving, controlling, comparing, determining and immobilizing the vehicle only if the vehicle condition meets a predetermined criterion,

-the vehicle condition is a predetermined test interval for the driver of the vehicle, and

-said predetermined criterion is a current state within said test interval.

12. A vehicle (100, 102) comprising a control unit (200) according to claim 11.

13. The vehicle (100, 102) of claim 12, further comprising:

-an engine (206), and

- HMI（202）。

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