JP2010261346A - Sudden start preventive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sudden start preventive device capable of eliminating the problem caused by erroneous operation of an accelerator pedal, without using a switch for detecting a turning angle of the accelerator pedal. <P>SOLUTION: In acceleration, the accelerator pedal is strongly stepped in traveling, for example, when a vehicle speed is 8 km/h or less, and when the total pulse number from a rotary encoder 31 becomes, for example, 80% or more of a maximum value, a relay 61 is operated by determining that the accelerator pedal 11 is erroneously stepped, and an engine is stopped by cutting off current-carrying to an ignition circuit or a fuel supply circuit. In deceleration, the accelerator pedal 11 is strongly stepped in traveling, for example, when the vehicle speed is 16 km/h or less, and when the total pulse number becomes, for example, 80% or more of the maximum value, the relay 61 is operated by determining that the accelerator pedal 11 is erroneously stepped, and the engine is put in a stopping state by cutting off the current-carrying to the ignition circuit or the fuel supply circuit. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a sudden start prevention device for preventing a sudden start of a vehicle.

  Conventionally, an accelerator pedal and a brake pedal have been provided at the foot of the driver's seat, and the vehicle is accelerated by depressing the accelerator pedal, while the vehicle can be decelerated and stopped by depressing the brake pedal. Yes.

  However, in recent years, there are an increasing number of cases where the accelerator pedal is depressed by mistake as a brake pedal.

  In this case, a situation occurs in which the vehicle is accelerated against the will to decelerate.

  In order to solve this problem, an automobile travel control device has been devised (see, for example, Patent Document 1).

  The vehicle travel control device includes an engine stop switch that operates when the turning angle of the accelerator pedal exceeds a predetermined amount. When the engine stop switch is turned on, an engine control computer, an ignition device, The engine can be stopped by outputting a signal to a fuel injector or a fuel pump.

JP 2008-110744 A

  However, in such a conventional apparatus, the depression state of the accelerator pedal is detected by an engine stop switch fixed to the bracket.

  For this reason, this engine stop switch must be provided at a position where it operates when the accelerator pedal is depressed by a predetermined amount, and requires delicate adjustment work.

  The present invention has been made in view of such a conventional problem, and is capable of solving a problem caused by an erroneous operation of the accelerator pedal without using a switch for detecting the turning angle of the accelerator pedal. An object of the present invention is to provide a start prevention device.

  In order to solve the above-described problem, the sudden start prevention device according to claim 1 of the present invention includes a stepping amount detection device that mechanically detects the depression amount of the accelerator pedal and outputs it as an accelerator signal, and the depression amount detection. A sudden start prevention device including a control unit that controls the engine based on the accelerator signal from the device, wherein the control unit defines a change in which the accelerator signal input from the stepping amount detection device is defined as abnormal And a safety mode executing means for bringing the engine into a non-accelerated state such as a stopped state or an idling state when the engine is displaced.

  In other words, if the accelerator pedal is depressed by mistake, the accelerator pedal is depressed with a strong depressing force, and the depression amount detection device that mechanically detects the depression amount or depression speed of the accelerator pedal shows an abnormal change. An accelerator signal is output.

  Then, the control unit that has input the accelerator signal determines that the accelerator signal input from the stepping amount detection device has been displaced by changes defined as abnormal (stepping amount and stepping speed), and the engine is stopped or idling. The state is not accelerated. Thus, even when the accelerator pedal is depressed strongly by mistake with the brake pedal, sudden start is prevented.

  At this time, the depression amount detecting device is configured to output the depression amount of the accelerator pedal as an accelerator signal. For this reason, compared with the case where the depression amount of the accelerator pedal is determined by a signal from the switch, malfunction due to the mounting position or the like is prevented.

  In the sudden start prevention device according to claim 2, the safety mode execution means sets the engine to the non-accelerated state when the accelerator signal is displaced with a change defined as abnormal when the vehicle speed is a predetermined value or less. To do.

  That is, when the vehicle speed is less than a predetermined value and the accelerator signal is displaced with a change defined as abnormal, the engine is brought into the non-accelerated state.

  Thereby, it can be set as the said non-acceleration state according to a driving | running | working state.

  Furthermore, in the sudden start prevention device according to claim 3, the predetermined value is set to a different value between vehicle acceleration and vehicle deceleration, and the predetermined value during vehicle acceleration is smaller than the predetermined value during vehicle deceleration. Set to value.

  That is, when the engine signal is displaced in a non-accelerated state when the accelerator signal is displaced with a change defined as abnormal, it is a condition that the vehicle speed is equal to or less than a predetermined value. The vehicle acceleration time is set to a smaller value.

  For example, at the time of vehicle acceleration, when the accelerator pedal is strongly depressed during traveling at a vehicle speed of 8 km / h or less and the accelerator signal becomes, for example, 80% or more of the maximum value, or the increase speed of the accelerator signal is, for example, maximum When the value is 80% or more, it can be determined that the accelerator pedal is mistakenly pressed.

  Further, when the vehicle decelerates, for example, when the accelerator pedal is strongly depressed during traveling at a vehicle speed of 16 km / h or less and the accelerator signal becomes, for example, 80% or more of the maximum value, or the increase speed of the accelerator signal is When the maximum value is 80% or more, it can be determined that the accelerator pedal is mistakenly pressed.

  In addition, the sudden start prevention device according to claim 4 includes a learning mode execution means for storing the accelerator signal and the stepping speed in a full accelerator state in which the accelerator pedal is fully depressed.

  That is, in the initial state, by inputting and storing the accelerator signal in the full accelerator state where the accelerator pedal is fully depressed, for example, when an installation error occurs in the stepping amount detection device or between individual vehicles Even if there is a difference, the state of the input accelerator signal can be inspected with reference to the accelerator signal stored in the full accelerator state. In addition, since the accelerator depression speed is stored in the learning, even if there is a difference in the accelerator operation speed of the driver, it is possible to inspect based on the speed.

  As described above, in the sudden start prevention device according to claim 1 of the present invention, by detecting an abnormal change in the accelerator signal input from the stepping amount detecting device, the accelerator pedal is strongly mistaken for the brake pedal. It is possible to detect that it has been depressed.

  As a result, it is possible to avoid a situation in which the vehicle is accelerated against the intention of decelerating, and problems caused by erroneous operation of the accelerator pedal can be solved.

  Compared to the conventional case where an engine stop switch for detecting the amount of depression of the accelerator pedal is attached at a position where the accelerator pedal is turned on when the accelerator pedal is depressed by a predetermined amount, and the accelerator depression state must be detected. Thus, without using the engine stop switch, it is possible to prevent the occurrence of a problem such as a sudden start due to an erroneous operation of the accelerator pedal. Along with this, delicate adjustment work of the mounting position is not required, and malfunction due to the mounting position can be prevented.

  Therefore, it is possible to eliminate a problem caused by an erroneous operation of the accelerator pedal without using a switch for detecting the turning angle of the accelerator pedal.

  The sudden start prevention device according to claim 2 is configured to put the engine in the non-accelerated state when the accelerator signal is displaced with a change defined as abnormal when the vehicle speed is a predetermined value or less. The non-accelerated state can be formed according to the running state.

  As a result, it is possible to achieve appropriate acceleration in scenes requiring rapid acceleration such as traveling on a highway while sufficiently exhibiting the effect of preventing sudden start during low-speed traveling.

  Furthermore, in the sudden start prevention device according to claim 3, in the case where the engine is brought into the non-accelerated state when the accelerator signal is displaced by a change defined as abnormal, it is a condition that the vehicle speed is a predetermined value or less. The predetermined value is set to a smaller value during vehicle acceleration than during vehicle deceleration.

  For this reason, at the time of start in which the vehicle is accelerated, the effect of preventing sudden start can be exhibited even at a relatively low speed.

  In addition, in the sudden start prevention device according to claim 4, the accelerator signal in a full accelerator state in which the accelerator pedal is fully depressed is input and stored, for example, in the stepping amount detection device. Even if there is an attachment error, or even if there is an individual difference between vehicles, the input accelerator signal can be appropriately processed with reference to the accelerator signal stored in the full accelerator state.

It is a block diagram which shows one embodiment of this invention. It is a flowchart which shows the operation | movement of the embodiment. It is a flowchart which shows the interruption operation | movement of the embodiment. It is a figure which shows the relationship between the accelerator depression amount, the total pulse number, and output voltage of the embodiment.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a sudden start prevention device 1 according to the present embodiment, and shows a state in which the sudden start prevention device 1 is attached to a vehicle.

  An accelerator pedal 11 and a brake pedal are provided at the foot of the driver's seat of the vehicle (only the accelerator pedal 11 is shown). The vehicle can be decelerated and stopped.

  A wire cable 22 is connected to the accelerator unit 21 provided with the accelerator pedal 11, and the wire cable 22 is connected to a throttle position sensor 23. The throttle position sensor 23 is configured to detect the depression amount of the accelerator pedal 11 from the movement amount of the wire cable 22, and the throttle position sensor 23 sends a signal corresponding to the detected depression amount to the on-vehicle ECU. (Engine control unit) 24 is configured to output.

  The accelerator unit 21 is equipped with a rotary encoder 31 as a step amount detecting device that mechanically detects the amount of depression of the accelerator pedal 11 and outputs it as an accelerator signal. The rotary encoder 31 includes a rotor 32 that rotates in accordance with the depression amount of the accelerator pedal 11, and is configured to acquire the depression amount as a rotation amount.

  The rotary encoder 31 is configured to output pulse signals having different phases according to the rotation of the rotor 32, and based on the phase change of both pulse signals, the rotation direction of the rotor 32, that is, the accelerator pedal 11 is configured. It is configured to detect whether or not is operated in the stepping-in direction or in the returning direction.

  Further, the amount of depression of the accelerator pedal 11 can be detected from the number of pulses output from the rotary encoder 31, and the number of pulses output from the rotary encoder 31 is increased or decreased according to the change in the phase. By counting the total number of pals, the amount of depression of the accelerator pedal 11 can be detected.

  The rotary encoder 31 is connected to a control device 41 provided in the vehicle, and a pulse signal as an accelerator signal output from the rotary encoder 31 is passed through an interface circuit 42 provided in the control device 41. Are input to the microcomputer 43.

  The accelerator unit 21 is provided with a starting point switch 51 that is turned on when the accelerator pedal 11 is depressed. The starting point switch 51 also includes the interface circuit 42 provided in the control device 41. And is connected to the microcomputer 43.

  A vehicle speed signal indicating the speed of the vehicle is output from the in-vehicle ECU 24, and the vehicle speed signal is also input to the microcomputer 43 via the interface circuit 42 provided in the control device 41. Has been.

  A relay 61 is connected to the microcomputer 43 via the interface circuit 42, and the relay 61 is configured to control the energization state of the ignition circuit or the fuel supply circuit of the vehicle.

  Thereby, the microcomputer 43 turns on and off the relay 61 based on the pulse signal from the rotary encoder 31 and controls the energization to the ignition circuit or the fuel supply circuit, thereby operating the accelerator pedal 11. Regardless, the engine of the vehicle is stopped so that a non-accelerated state can be formed.

  Here, in the present embodiment, the case where the energization to the ignition circuit or the fuel supply circuit is controlled will be described. However, the present invention is not limited to this, and an idling signal is output to the in-vehicle ECU 24 to The non-accelerated state may be formed with the engine idling.

  Further, although the depression amount of the accelerator pedal 11 is detected using the pulse signal from the rotary encoder 31, the present invention is not limited to this, and the voltage from the throttle position sensor 23 is input to input the accelerator pedal 11. The amount of depression may be detected.

  Two indicators 71, 72 are connected to the microcomputer 43 via the interface circuit 42, and the operation state of the sudden start prevention device 1 can be displayed by the lighting state of both indicators 71, 72. ing. Further, a learning mode switch 73 is connected to the microcomputer 43 via the interface circuit 42, and the microcomputer 43 is configured to detect the state of the learning mode switch 73.

  The control device 41 is provided with a power supply circuit 81 connected to an in-vehicle battery, and the microcomputer 43, the interface circuit 42, and the relay 61 are activated by receiving power supply from the power supply circuit 81. It is configured as follows.

  The microcomputer 43 includes a ROM and a RAM, and the sudden start prevention device 1 is configured to operate when the microcomputer 43 operates according to a program stored in the ROM.

  The operation of the present embodiment according to the above configuration will be described with reference to the flowchart shown in FIG.

  That is, when the microcomputer 43 is reset (S1), initial setting is performed in the initial setting process (S2), the RAM built in the microcomputer 43 is cleared, interrupts are initialized, port I / O is set, and the like. The learning flag, DIPSW, and other settings are read from the EEPROM.

  Then, as shown in FIG. 3, for example, timer interrupt processing called every 1 ms is started, and in the timer interrupt processing, for example, a 2 ms cycle is created (SB1), and between the pulses of the vehicle speed signal from the in-vehicle ECU 24 Is measured (SB2).

  In addition, port interrupt processing that occurs every time the input of the port to which the vehicle speed signal is input is changed, and the vehicle speed is obtained from the time between pulses of the vehicle speed signal (SC1). The number of each pulse is increased or decreased according to the change in the phase of both pulses, and the total number of pulses is counted (SC2).

  On the other hand, in the main process, as shown in FIG. 2, for example, it is determined whether or not the cycle is 2 ms (S3). For example, when 2 ms has not elapsed, the process waits, while for example, 2 ms has elapsed. The vehicle speed state control such as slow speed, semi-slow speed, cruise, or semi-cruise is performed (S4).

  Then, the manufacturer setting of the vehicle speed pulse is read (only in the learning mode), the state of the mode change switch and the learning mode switch 73 is detected, the operation is performed in the extended learning mode, the vehicle speed self-diagnosis is performed when the SAFTY is switched, etc. Is performed by the SW input process (S5), and the state of the accelerator pedal 11 is performed by the accelerator input process (S6).

  Next, it is determined whether or not the learning mode switch 73 has been turned on (S7). If the learning mode switch 73 has not been turned on, the process branches to step S10. On the other hand, if it is turned on, a learning process is performed (S8), and an extended learning process is performed (S9).

  More specifically, the total number of pulses from the rotary encoder 31 in a full accelerator state in which the accelerator pedal is fully depressed and the total number of pulses when the accelerator pedal 11 is released are stored.

  At this time, when the throttle position sensor 23 detects the state of the accelerator pedal 11, the sealing voltage input from the throttle position sensor 23 in the full accelerator state where the accelerator pedal is fully depressed, and the accelerator pedal The floor voltage inputted from the throttle position sensor 23 at the time of idling when 11 is released is inputted and stored.

  Here, the total number of pulses of the pulse signal input from the rotary encoder 31 and the output voltage from the throttle position sensor 23 change in proportion to the amount of depression of the accelerator pedal 11, as shown in FIG. It is configured as follows.

  Then, after performing the sudden start detection process (S10), the relay output process is performed (S11), and the engine is stopped when the total number of pulses acquired from the rotary encoder 31 is displaced with a change defined as abnormal. A non-accelerated state is formed as a state.

  Here, when the idling signal is output to the in-vehicle ECU 24 when the total number of pulses acquired from the rotary encoder 31 is displaced with a change defined as abnormal, the engine is set in an idling state to form the non-acceleration state. It shall be.

  Specifically, when the vehicle is accelerating, the accelerator pedal is strongly depressed while the vehicle is traveling at a speed of, for example, 8 km / h or less, and the total pal number is, for example, 80% or more of the maximum value. The relay 61 is actuated by determining that the accelerator pedal 11 has been depressed by mistake, and the power supply to the ignition circuit or the fuel supply circuit is cut off. As a result, the engine is stopped.

  Further, when the vehicle is decelerating, when the vehicle speed is, for example, 16 km / h or less, the accelerator pedal 11 is strongly depressed and the total number of pulses is, for example, 80% or more of the maximum value, the accelerator pedal The relay 61 is actuated by determining that the step 11 is wrong, and the power supply to the ignition circuit or the fuel supply circuit is cut off. As a result, the engine is stopped.

  Next, for example, it is determined whether or not 50 ms has passed (S12). If, for example, 50 ms has not passed, the process proceeds to step S3. If, for example, 50 ms has passed, LED output processing is performed. Each indicator 71, 72 is turned on to display the current operating state (S13), and the process proceeds to step S3.

  In this way, nothing is done during normal travel, so that an engine output corresponding to the amount of depression of the accelerator pedal 11 can be obtained.

  On the other hand, when the accelerator pedal 11 is depressed by mistake as a brake pedal, the accelerator pedal 11 is depressed with a strong depression force, and the pulse signal input from the rotary encoder 31 that mechanically detects the depression amount of the accelerator pedal 11. The total number of pulses indicates an abnormal number such as 80% or more of the maximum value.

  In such a case, since the accelerator depressing speed is also increased, an abnormal change such as 80% or more of the maximum speed is exhibited.

  Then, the microcomputer 43 of the control device 41 constituting the control unit determines that the total number of pulses of the pulse signal input from the rotary encoder 31 or the increase speed of the pulses is abnormal, and stops the engine. To form a non-accelerated state. Thus, even when the accelerator pedal 11 is depressed deeply by mistake as a brake pedal, sudden start is prevented.

  As described above, it is possible to detect that the accelerator pedal 11 is strongly depressed by mistake from the brake pedal by the input from the rotary encoder 31.

  For this reason, it is possible to avoid a situation in which the vehicle is accelerated against the intention of decelerating, and problems caused by an erroneous operation of the accelerator pedal 11 can be solved.

  At this time, the rotary encoder 31 is configured to output the depression amount of the accelerator pedal 11 as a pulse signal as an accelerator signal.

  For this reason, it has been necessary to install an engine stop switch for detecting the amount of depression of the accelerator pedal at a position where it is turned on when the accelerator pedal is depressed by a predetermined amount, and to detect the depression state of the accelerator pedal. In comparison, without using the engine stop switch, it is possible to prevent the occurrence of problems such as a sudden start due to an erroneous operation of the accelerator pedal 11. Along with this, delicate adjustment work of the mounting position is not required, and malfunction due to the mounting position can be prevented.

  Therefore, it is possible to eliminate a problem caused by an erroneous operation of the accelerator pedal 11 without using a switch for detecting the turning angle of the accelerator pedal 11.

  At this time, when the vehicle speed of the vehicle is equal to or less than a predetermined value and the total number of pulses of the pulse signal from the rotary encoder 31 indicates an abnormality, the engine is configured to be in the non-accelerated state, The non-accelerated state can be formed according to the state.

  As a result, it is possible to achieve appropriate acceleration in scenes requiring rapid acceleration such as traveling on a highway while sufficiently exhibiting the effect of preventing sudden start during low-speed traveling.

  That is, when the engine is put into the non-accelerated state when the total number of pulses of the pulse signal from the rotary encoder 31 shows an abnormality, it is a condition that the vehicle speed is a predetermined value or less. Is set to a smaller value during vehicle acceleration than during vehicle deceleration.

  Specifically, during acceleration of the vehicle, when the accelerator pedal 11 is strongly depressed during traveling at a vehicle speed of, for example, 8 km / h or less, and the total number of pulses becomes, for example, 80% or more of the maximum value, the accelerator pedal It can be determined that 11 is wrong.

  Further, when the vehicle is decelerated, if the accelerator pedal 11 is strongly depressed during traveling at a vehicle speed of, for example, 16 km / h or less, and the total number of pulses becomes, for example, 80% or more of the maximum value, the accelerator pedal 11 is erroneously depressed It can be judged.

  For this reason, when starting the vehicle in an accelerating state, even if the vehicle speed is a relatively low speed such as 8 km / h or less, the effect of preventing sudden start can be sufficiently exerted.

  On the other hand, in the present embodiment, a learning process for storing the total number of pulses in a full accelerator state in which the accelerator pedal 11 is fully depressed is provided.

  Therefore, by storing the total number of pulses in the full accelerator state where the accelerator pedal 11 is fully depressed in the initial state, for example, even when an attachment error occurs in the rotary encoder 31, the vehicle Even if there are individual differences, the total number of pulses of the input pulse signal can be appropriately processed on the basis of the total number of pulses stored in the full accelerator state.

DESCRIPTION OF SYMBOLS 1 Sudden start prevention apparatus 11 Accelerator pedal 31 Rotary encoder 41 Control apparatus 43 Microcomputer 61 Relay

Claims (4)

Sudden start prevention provided with a depression amount detection device that mechanically detects the depression amount of the accelerator pedal and outputs it as an acceleration signal, and a control unit that controls the engine based on the acceleration signal from the depression amount detection device A device,
The control unit includes a safety mode execution unit that puts the engine in a non-accelerated state such as a stopped state or an idling state when the accelerator signal input from the stepping amount detection device is displaced by a change defined as abnormal. A sudden start prevention device characterized by that.   2. The sudden start according to claim 1, wherein the safety mode executing means sets the engine to the non-accelerated state when the accelerator signal is displaced with a change defined as abnormal when the vehicle speed is equal to or lower than a predetermined value. Prevention device.   3. The predetermined value is set to a different value between vehicle acceleration and vehicle deceleration, and the predetermined value during vehicle acceleration is set to a value smaller than the predetermined value during vehicle deceleration. The sudden start prevention device described.   4. The sudden start prevention device according to claim 1, further comprising learning mode execution means for storing the accelerator signal in a full accelerator state in which the accelerator pedal is fully depressed.

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