JP2011027091A - Method for controlling attenuation output of acceleration sensor signal converting device for electronic control throttle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an acceleration sensor signal converting device which prevents a sudden start and a sudden backward movement due to wrong operation of a brake pedal for an accelerator pedal, and easy to be installed. <P>SOLUTION: In this signal converting device, which attenuates an accelerator opening signal and outputs it, a method for controlling attenuation output of the acceleration sensor signal converting device, with which attenuation output is performed in the case wherein the change time of the accelerator opening signal from the position of a set accelerator opening 1 to the position of a set accelerator opening 2 becomes a set value or less, is used to prevent a sudden start and a sudden backward movement due to wrong operation of a brake pedal for an accelerator pedal. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a control method for an accelerator sensor signal conversion device for an electronically controlled throttle, and more particularly to an accelerator sensor signal for an electronically controlled throttle that is easy to install and prevents sudden start and reverse due to a stepping mistake with an accelerator pedal. The present invention relates to a method for controlling a conversion device.

  Conventionally, the throttle of a vehicle has been mechanically opened and closed by interlocking the depression of an accelerator pedal and a wire. In recent years, electronically controlled throttle devices that determine the opening of a throttle using an engine computer have become widespread in order to perform vehicle engine control with high accuracy. Such an electronically controlled throttle device controls the throttle opening so that an appropriate intake air amount and fuel injection amount are obtained in accordance with the engine speed and speed signals in the engine computer according to the depression amount of the accelerator pedal. To do.

  In recent years, with the aging of the driver, accidents caused by mistakes in the depression of the accelerator pedal with the brake pedal have frequently occurred. These accidents frequently occur when parking or entering the garage. For example, there are many tragic accidents, such as falling over the parking lot and falling off the ground or hitting the guide.

  In the “abrupt start prevention control device” disclosed in Japanese Patent Laid-Open No. 5-170005 (Patent Document 1), in a vehicle equipped with an electronically controlled automatic transmission, a sudden start when the driver accidentally steps on the accelerator is performed. This device prevents the vehicle pressure, accelerator position, accelerator depression speed, and the state of the switch operated by the driver, and controls the line pressure. As a result, when the accelerator is suddenly depressed, the torque transmission of the torque converter is reduced to prevent sudden start of the vehicle, except when it is determined that the accelerator is intentionally depressed from the state before the accelerator is depressed.

  Japanese Patent Laid-Open No. 2001-263121 (Patent Document 2) discloses a “reverse control device for a vehicle” that prevents an unexpected acceleration of the driver from occurring when the vehicle is reverse. Output changing means that operates to change the output of the engine, operating means operated to arbitrarily adjust the output of the engine, reverse detection means for detecting the reverse of the vehicle, and detecting the vehicle speed Vehicle speed detecting means for controlling the output changing means to change the output of the engine so that the detected change amount of the vehicle speed does not exceed a predetermined reference value when the reverse of the vehicle is detected It is equipped with. As a result, it is possible to prevent the driver from being excessively operated by the driver when the vehicle is moving backward and causing the vehicle to accelerate rapidly.

  JP-A-5-170005   JP 2001-263121 A

  In Patent Document 1, the vehicle speed, the accelerator position, the accelerator depression speed, and the state of the switch operated by the driver are detected, and a control signal is given to the line pressure control solenoid by the line pressure reduction control to reduce the line pressure. As a result, the torque transmission of the torque converter is reduced, the acceleration performance of the vehicle is reduced, and sudden start is prevented. However, since it is impossible to determine whether the accelerator was stepped on accidentally or intentionally by the above judgment, there is an operation switch that prohibits this control when you want to step in suddenly. There is a problem that it is impossible to prevent a sudden start because the operation switch is in a state of prohibiting the present control and is often forgotten to be released. Further, when it is attached later, there is a problem that the device configuration is complicated, and the attachment becomes extremely complicated and expensive.

  In Patent Document 2, when the reverse of the vehicle is detected by the reverse switch, the output of the engine is controlled so that the value of the vehicle speed change calculated based on the value of the vehicle speed detected by the vehicle speed sensor does not exceed the predetermined determination acceleration value. In order to change the electronic throttle control, the controller controls the motor so that the throttle valve is opened and closed to adjust the intake air amount. It is possible to prevent sudden acceleration of the vehicle. However, it is characterized by preventing sudden acceleration during reverse, and the control method is such that the controller controls the motor to open and close the throttle valve to prevent sudden start by adjusting the intake air amount. Therefore, when it is attached later, there is a problem that the device configuration is complicated and the attachment becomes extremely complicated and expensive.

  An object of the present invention is to provide an accelerator sensor signal conversion device that solves the above-mentioned problems, prevents sudden start and reverse due to a mistake in stepping on the accelerator pedal with a brake pedal, and is easy to install.

  According to the present invention, in the signal converter that attenuates and outputs the accelerator opening signal, the change time of the accelerator opening signal from the set accelerator opening 1 to the accelerator opening 2 is set. This can be solved by adopting an attenuation output control method for an accelerator sensor signal conversion device for an electronically controlled throttle that performs attenuation output in the following cases.

  According to the present invention, in the signal conversion device that attenuates and outputs the accelerator opening signal, when the change time of the accelerator opening signal from the set accelerator opening 1 to the accelerator opening 2 is less than or equal to the set value Since it is configured to perform a damping output, it is possible to install the accelerator pedal with the brake pedal of the accelerator pedal, which can be installed very easily by wiring in the middle of the coupler connecting the accelerator sensor and the engine computer using a dedicated harness for each vehicle type. It has become possible to provide an attenuation output control method for an accelerator sensor signal converter of an electronically controlled throttle that can prevent sudden start and reverse due to a mistake.

It is a block diagram which shows the Example of this invention. It is a flowchart of the attenuation | damping output control method of an accelerator sensor signal converter. It is a flowchart of the attenuation | damping output control method of an accelerator sensor signal converter. It is a flowchart of the attenuation | damping output control method of an accelerator sensor signal converter.

BEST MODE FOR CARRYING OUT THE INVENTION

  Embodiments of an attenuation output control method for an accelerator sensor signal converter for an electronically controlled throttle according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram showing an embodiment of the present invention, and FIGS. 2 to 4 are flowcharts of an attenuation output control method of an accelerator sensor signal converter.

  The accelerator sensor signal converter main body (1) (hereinafter referred to as main body (1)) is an engine of an electronically controlled throttle of a vehicle comprising a throttle body (2), an engine computer (3), and an accelerator sensor (4). Connected between the computer (3) and the coupler connecting the accelerator sensor (4), and the change time of the accelerator opening signal from the set accelerator opening 1 to the accelerator opening 2 is less than the set value Is configured to output a damped output. That is, the accelerator opening 1 means that the accelerator pedal is opened 5%, the accelerator opening 2 means that the accelerator pedal is opened 60%, and the accelerator pedal is changed from 5% or less to 60% or more. When the time until the time is equal to or less than a set value, the accelerator opening signal output from the accelerator sensor (4) to the engine computer (3) is attenuated and output to suppress sudden start and reverse. .

  The applicant paid attention to the difference in the depression state of the accelerator pedal, that is, the depression speed when the accelerator pedal is mistakenly depressed with the brake pedal and when sudden acceleration of normal driving or sudden start from idling is performed. If you make a mistake, you will depress the accelerator pedal with the intention of depressing the brake pedal, so you will suddenly start or retreat suddenly by pressing the accelerator pedal all at once to stop it. At this time, the change speed of the accelerator opening becomes considerably steep compared to normal sudden acceleration or sudden start. In sudden acceleration or sudden start during normal driving, the accelerator pedal is depressed in accordance with the vehicle speed and acceleration state, so that the accelerator pedal is not depressed and there is no sudden change in the accelerator opening speed. If there is, it is limited to sports running on a circuit or the like. In such a case, the power source of the main body (1) may be turned off. As described above, the present invention makes it possible to determine the speed of change in the accelerator opening degree when making a mistake in stepping, and during normal sudden acceleration or sudden start, so that the two can be reliably discriminated.

  The main body (1) includes a microcomputer (1c), an A / D converter (1b), a D / A converter (1a), an operation unit (1d), a light emitting element (1e), an EEPROM (1f), and a relay (1g). It is configured.

The relay (1g) is of the C contact configuration, and the output signal from the accelerator sensor (4) is input. From the normally closed 1 (hereinafter NC) via the A / D converter (1b), the microcomputer (1c ).
The output signal from the accelerator sensor (4) is processed and controlled with respect to the value by the microcomputer (1c), and the attenuation control signal is sent from the D / A converter (1a) to the normally open 1 (hereinafter referred to as the relay (1g)). NO) and output to the engine computer (3) via the common 1 (hereinafter referred to as “com”). When the main body (1) is not in operation, the output is output from the accelerator sensor (4) to the engine computer (3) via NC and COM of the relay (1g).

  Thus, the operation | movement outline | summary of the main body (1) comprised between the engine computer (3) and the accelerator sensor (4) is demonstrated as follows. First, the vehicle's ignition key is turned on (engine is stopped), the accelerator pedal is fully closed (not depressed), and the switch 1 (not shown) in the operation unit (1d) is pressed, and the value at this time is fully changed. The closed state is stored in the EEPROM (1f).

  Next, the accelerator pedal is fully opened (depressed to the end), and the switch 2 (not shown) in the operation unit (1d) is pushed again, and the value at this time is stored in the EEPROM (1f) as the fully opened state. .

  The light emitting element (1e) is an LED for indicating a power source and a control state of the main body (1), an operation state of a switch in the operation unit (1d), and the like.

  1 shows only one output signal from the accelerator sensor (4), but when there are two output signals, each input / output part (relay (1g), A / D converter (1b), D / A Two converters (1a) may be prepared for each.

  The operation of the present invention described above will be described with reference to the flowchart shown in FIG. It is assumed that THR_A (accelerator opening 1) is 5%, THR_B (accelerator opening 2) is 60%, and the change time of the accelerator opening signal is 0.2 seconds.

S1: The process starts when the main body (1) is turned on.

S2: Each initial value is read from the EEPROM (1f), stored in the internal RAM, each flag is set to the initial state, and the relay (1g) is operated.

S3: A signal input from the accelerator sensor (4) to the microcomputer (1c) through the relay (1g) and the A / D converter (1a) is measured.

S4: Is the THR flag set? If it is compared and set, the process proceeds to step S5, and if not, the process proceeds to step S6.

S6 to S8: In step S6, THR (current opening) is compared with THR_A, and if THR is small, the process proceeds to step S20. If THR is large, the process proceeds to step S7 and the THR flag is turned on to start the 0.2 second count. The process proceeds to step S20.

If “YES” is determined in the step S4, it is compared whether or not the fully closed flag is set in a step S5, and if so, the process proceeds to a step S13, and if not, the process proceeds to a step S9.

In step S9, THR (current opening) is compared with THR_B, and if THR (current opening) is small, the process proceeds to step S10, and if larger, the process proceeds to step S11.

When the process proceeds to step S11, THR (current opening) is compared with THR_A. If THR is small, the process proceeds to step S17, and if large, the process proceeds to step S20.

S17 to S19: When the process proceeds to step S17, the THR flag is cleared, the 0.2 second counter is stopped, the count is cleared, and the process proceeds to step S20.

When the process proceeds from step S9 to step S11, it is confirmed whether it is within 0.2 seconds. If it is within 0.2 seconds, the process proceeds to step S12, and if 0.2 seconds or more have elapsed, the process proceeds to step S17.

S12, S16: When the process proceeds to “YES” in step S11, the fully closed flag is turned ON, the value of the accelerator opening 0% is written in THR (current opening), and the process proceeds to step S20.

If the process proceeds to “YES” in step S5, THR (current opening) is compared with THR_A in step S13. If THR (current opening) is small, the process proceeds to step S14, and if larger, the process proceeds to step S16. The value of THR (current opening) is rewritten to accelerator opening 0%, and the process proceeds to step S20.

S18 to S19: When the process proceeds to “YES” in step S13, the fully closed flag and the THR flag are turned off (S14 to S15), and when the count value is cleared by stopping the 0.2 second counter, the process proceeds to step S20.

In step S20, an increase / decrease process according to THR (current opening) is performed to rewrite the value of THR. (Do nothing when THR is 0%.)

In step S21, an output process to the D / A converter is performed, and thereafter these processes are repeated.

  Next, FIG. 4 will be described. The flowchart of FIG. 3 is added as a subroutine (step 35) between step S3 and step S4 in FIG. 2, and immediately after that, step S36 of branch determination “ST flag = ON?” Is performed immediately after step S17. A case where the process of “ST flag OFF” is added as step S37 will be described. The description will be made assuming that the predetermined time is 5 minutes.

The initial setting such as TM flag clear and ST flag ON is performed in the process of step S2. Next, the process of step S3 is performed, and the process proceeds to step S23.

If the TM flag is ON in step S23, the process proceeds to step S25, and if it is OFF, the process proceeds to step S24.

If THR (current opening) is 0% in step S24, the process proceeds to step S25 to start TM Count, the TM flag is turned on, and the process proceeds to step S34. If THR (current opening) is other than 0%, the process proceeds to step S34.

Steps S28 to S31: When the process proceeds to “YES” in Step S23, if THR (current opening) is 0% in Step S27, the process proceeds to Step S32, and if THR (current opening) is other than 0%. Proceeding to step S28, TM Count is stopped and then cleared, the TM flag is turned off and the ST flag is turned off, and the process proceeds to step S34.

When the process proceeds to “YES” in step S27, it is determined whether or not 5 minutes or more have elapsed in step S32. If not, the process proceeds to step S34, and if it has elapsed, the process proceeds to step S33 and the ST flag is turned on. Proceed to step S34.

If the ST flag is ON in step S35, the process from step S4 is performed, and if it is OFF, the process of step S20 is performed.

  In the above description, THR_A is 5%, THR_B is 60%, the change time is 0.2 seconds, the return condition time is 5 minutes, and the accelerator opening is 0%, but the operation unit (1d) inside the main body (1) The setting may be changed as appropriate, or the fixed operation may be performed at another value.

  The main body (1) configured as described above determines whether the driver makes a mistake in stepping on the accelerator pedal with the brake pedal and normal sudden acceleration or sudden start. The output signal of 4) is controlled to be attenuated more than the normal output signal and output to the engine computer (3), thereby making it possible to suppress sudden start and sudden reverse.

  In addition, by adding a back signal when the vehicle moves backward to the main body (1) and inputting it, the vehicle can be operated only when the accelerator pedal depressing speed exceeds a certain level, or when the accelerator pedal is in the OFF state. This function may not be operated after a certain period of time when it is depressed from (fully closed), and may be operated again under the condition that the accelerator pedal is not depressed for a certain period of time.

  Furthermore, although not shown, in addition to the speed of change of the accelerator opening described above, speed information obtained from the vehicle speed sensor (for example, stop state or extremely low speed state) is additionally input to the main body (1) as a setting condition. Also good. In this case, it goes without saying that it is possible to further prevent malfunction, and to easily distinguish between a stepping error and a normal sudden acceleration or sudden start.

DESCRIPTION OF SYMBOLS 1 Attenuation output control apparatus main body 1a of accelerator sensor signal converter 1a D / A converter 1b A / D converter 1c Microcomputer 1d Operation part 1e Light emitting element 1f EEPROM
1g relay 2 throttle body 2a throttle opening sensor 2b motor 3 engine computer 4 accelerator sensor

Claims (1)

  In the signal conversion device that attenuates and outputs the accelerator opening signal, electronic control that performs attenuation output when the change time of the accelerator opening signal from the set accelerator opening 1 to the position of the accelerator opening 2 is not more than the set value A throttle output control method for an accelerator sensor signal converter for a throttle.

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