WO2012039181A1 - 車両用アクセルペダル装置及びペダル反力制御方法 - Google Patents
車両用アクセルペダル装置及びペダル反力制御方法 Download PDFInfo
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- WO2012039181A1 WO2012039181A1 PCT/JP2011/065433 JP2011065433W WO2012039181A1 WO 2012039181 A1 WO2012039181 A1 WO 2012039181A1 JP 2011065433 W JP2011065433 W JP 2011065433W WO 2012039181 A1 WO2012039181 A1 WO 2012039181A1
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- reaction force
- engine speed
- pedal
- accelerator pedal
- vehicle
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000009467 reduction Effects 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000007423 decrease Effects 0.000 claims description 66
- 230000005540 biological transmission Effects 0.000 claims description 39
- 230000001133 acceleration Effects 0.000 claims description 18
- 230000003247 decreasing effect Effects 0.000 claims description 8
- 230000002040 relaxant effect Effects 0.000 claims 1
- 230000004048 modification Effects 0.000 description 16
- 238000012986 modification Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 15
- 230000008569 process Effects 0.000 description 9
- 230000000994 depressogenic effect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000012886 linear function Methods 0.000 description 1
- 230000007420 reactivation Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/02—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by hand, foot, or like operator controlled initiation means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W50/00—Details of control systems for road vehicle drive control not related to the control of a particular sub-unit, e.g. process diagnostic or vehicle driver interfaces
- B60W50/08—Interaction between the driver and the control system
- B60W50/14—Means for informing the driver, warning the driver or prompting a driver intervention
- B60W50/16—Tactile feedback to the driver, e.g. vibration or force feedback to the driver on the steering wheel or the accelerator pedal
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K26/00—Arrangements or mounting of propulsion unit control devices in vehicles
- B60K26/02—Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements
- B60K26/021—Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements with means for providing feel, e.g. by changing pedal force characteristics
- B60K2026/023—Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements with means for providing feel, e.g. by changing pedal force characteristics with electrical means to generate counter force or torque
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2510/00—Input parameters relating to a particular sub-units
- B60W2510/06—Combustion engines, Gas turbines
- B60W2510/0638—Engine speed
- B60W2510/0652—Speed change rate
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/20—Control lever and linkage systems
- Y10T74/20528—Foot operated
Definitions
- the present invention relates to a vehicular accelerator pedal device and a pedal reaction force control method provided with a reaction force applying means for applying a reaction force to an accelerator pedal.
- JP2004-314871A discloses an accelerator pedal depression force control device that increases the depression force (reaction force) on the depression side of the accelerator pedal as the engine speed increases (see claim 4).
- the present invention has been made in consideration of such problems, and an object thereof is to provide a vehicle accelerator pedal device and a pedal reaction force control method capable of preventing the driver from feeling uncomfortable with respect to the operation of the accelerator pedal.
- the vehicular accelerator pedal device includes a reaction force applying means for applying a pedal reaction force to the accelerator pedal, the engine speed detecting means for detecting the engine speed, and the reaction force applying means.
- Reaction force control means for controlling the pedal reaction force to be applied based on the engine speed, and the reaction force control means is configured to control the pedal when the rate of decrease in the engine speed is equal to or greater than a predetermined value. It is characterized by limiting the reduction rate of the reaction force.
- the reduction rate of the engine speed becomes a predetermined value or more
- the reduction rate of the pedal reaction force is limited. For this reason, for example, a decrease in the engine speed (for example, a decrease in the engine speed at the time of shift-up or a sudden increase) in a state where the accelerator pedal position is left as it is or a state where the accelerator pedal is depressed (not intended or predicted by the driver). Even when a decrease in the engine speed due to entering the uphill slope) occurs, it is possible to avoid a sudden decrease in the pedal reaction force. Therefore, it is possible to prevent the driver from feeling uncomfortable due to the sudden decrease in the pedal reaction force.
- the vehicle accelerator pedal device further includes pedal operation amount detection means for detecting a pedal operation amount of the accelerator pedal, and the reaction force control means is based on the pedal operation amount detected by the pedal operation amount detection means, You may correct
- the reaction force control means Limits may be relaxed.
- the pedal operation amount is less than or equal to the second predetermined value, it is possible to relax the restriction on the rate of decrease in the pedal reaction force and accelerate the decrease in the pedal reaction force.
- the pedal operation amount is large, the driver is more likely to have an acceleration intention, and when the pedal operation amount is small, the driver is more likely to have a deceleration intention.
- the driver once decelerates the vehicle and then shifts the vehicle to reacceleration or constant speed traveling.
- the accelerator pedal is depressed again.
- the pedal reaction force is large at this time, the driver may feel uncomfortable.
- the second predetermined value is used to determine whether or not the driver intends to end acceleration, and when it is determined that the driver intends to end acceleration, the pedal reaction force is reduced early and the subsequent resumption is performed. It becomes possible to prepare for acceleration or constant speed running. Therefore, the driver's operation of the accelerator pedal that leads to subsequent reacceleration or constant speed traveling can be made smooth.
- the vehicular accelerator pedal device further includes a transmission that shifts the output rotation of the engine based on a preset shift speed and transmits it to the wheels, and the reaction force control means is adapted to shift up the transmission. Then, when the reduction rate of the engine speed becomes equal to or greater than the predetermined value, the reduction rate of the pedal reaction force may be limited.
- the reaction force control means calculates a target engine speed that is a target value of the engine speed from the output result of the engine speed detection means, and the current engine speed obtained from the engine speed detection means and the previous time
- the rate of decrease in the pedal reaction force may be limited.
- the pedal reaction force control method is in a vehicular accelerator pedal device including a reaction force applying means for applying a pedal reaction force to an accelerator pedal, and detects an engine speed by an engine speed detecting means,
- the pedal reaction force applied by the reaction force applying means is controlled based on the engine speed by the reaction force control means, and the rate of decrease in the pedal reaction force when the rate of decrease in the engine speed exceeds a predetermined value. It is characterized by restricting.
- the vehicular accelerator pedal device includes a reaction force applying means for applying a pedal reaction force to the accelerator pedal, the engine speed detecting means for detecting the engine speed, and the reaction force applying means.
- Reaction force control means for controlling the pedal reaction force to be applied based on the engine speed, and the reaction force control means temporarily reduces the rate of decrease in the pedal reaction force when the transmission is shifted up. It is characterized by limiting.
- the rate of decrease in the pedal reaction force is temporarily limited. For this reason, it is possible to avoid a sudden decrease in the pedal reaction force even when the engine speed decreases with the shift up. Therefore, it is possible to prevent the driver from feeling uncomfortable due to the sudden decrease in the pedal reaction force.
- FIG. 1 is a block diagram of a vehicle equipped with a vehicle accelerator pedal device according to an embodiment of the present invention. It is a flowchart in which a reaction force electronic control device controls a pedal reaction force. It is a figure which shows the relationship between a target engine speed and a target reaction force. It is a flowchart which calculates the said target engine speed. It is explanatory drawing which shows the process which calculates the said target engine speed as a virtual circuit structure. It is a time chart for comparing the reaction force control in the said embodiment and the reaction force control in a comparative example. It is a flowchart of the modification of the control (what combined FIG. 2 and FIG. 4) in the said embodiment. It is a time chart for comparing the reaction force control in the said embodiment and comparative example demonstrated in FIG. 6, and the reaction force control shown in FIG. It is a figure which shows an example of the transmission characteristic of an automatic transmission vehicle.
- FIG. 1 is a block diagram of a vehicle 10 equipped with a vehicle accelerator pedal device 12 (hereinafter referred to as “pedal device 12”) according to an embodiment of the present invention.
- the vehicle 10 is, for example, a four-wheeled vehicle.
- the vehicle 10 includes an engine 14, an engine speed sensor 16 (hereinafter referred to as “Ne sensor 16") that detects an engine speed Ne [rpm] of the engine 14, a transmission 18, and wheels. 20 and a transmission electronic control unit 22 (hereinafter referred to as “transmission ECU 22”) for controlling the transmission 18.
- Ne sensor 16 an engine speed sensor 16
- transmission ECU 22 transmission electronic control unit 22
- the pedal device 12 includes an accelerator pedal 30, a return spring 32 that applies a reaction force Fr_sp [N] to the accelerator pedal 30, an operation amount sensor 34, and a reaction force electronic control device 36 (hereinafter referred to as a “reaction force ECU 36”). And a motor 38 for applying a reaction force (hereinafter referred to as “pedal reaction force Fr”) [N] to the accelerator pedal 30 and a current sensor 40 (stepping force sensor).
- the operation amount sensor 34 detects the depression amount (pedal operation amount ⁇ ) [°] from the original position of the accelerator pedal 30 and outputs it to the transmission ECU 22 and the reaction force ECU 36.
- the reaction force ECU 36 sets a target value (target reaction force Fr_tar) [N] of the pedal reaction force Fr according to the engine speed Ne detected by the Ne sensor 16, and outputs a control signal Sr indicating the target reaction force Fr_tar to the motor. 38.
- the motor 38 is connected to the accelerator pedal 30 and applies a pedal reaction force Fr corresponding to the control signal Sr received from the reaction force ECU 36 to the accelerator pedal 30. Thereby, in addition to the reaction force Fr_sp by the return spring 32, the pedal reaction force Fr from the motor 38 is added to the accelerator pedal 30.
- the motor 38 may be other driving force generation means (for example, a pneumatic actuator).
- the current sensor 40 detects the current (motor current Im) [A] consumed by the motor 38 and notifies the reaction force ECU 36 of it.
- the motor current Im changes according to the output of the motor 38, and the reaction force ECU 36 can determine the pedal reaction force Fr generated by the motor 38 based on the motor current Im.
- the transmission 18 is an automatic transmission including a torque converter (not shown) capable of switching a plurality of shift speeds.
- the transmission ECU 22 controls the gear position of the transmission 18 based on the pedal operation amount ⁇ detected by the operation amount sensor 34. In controlling the transmission 18, the transmission ECU 22 uses a control signal St.
- FIG. 2 is a flowchart in which the reaction force ECU 36 controls the pedal reaction force Fr.
- step S ⁇ b> 1 the reaction force ECU 36 acquires the engine speed Ne from the Ne sensor 16.
- engine speed Ne (n) the engine speed Ne acquired in the current process
- step S2 the reaction force ECU 36 calculates a target value of the engine speed Ne (hereinafter referred to as “target engine speed Ne_tar”) based on the engine speed Ne (n).
- the target engine speed Ne_tar is a value used by the reaction force ECU 36, in other words, a value used for controlling the pedal reaction force Fr. It should be noted that the target engine speed Ne_tar here is not used in the fuel injection control of the engine 14 or the like.
- target engine speed Ne_tar (n) the target engine speed Ne_tar acquired in the current process
- target engine speed Ne_tar ( n-1) the target engine speed Ne_tar acquired in the previous process
- a method for calculating the target engine speed Ne_tar will be described in detail later.
- step S3 the reaction force ECU 36 sets the current target reaction force Fr_tar (hereinafter referred to as “target reaction force Fr_tar (n)”) based on the target engine speed Ne_tar (n).
- FIG. 3 shows the relationship between the target engine speed Ne_tar (n) and the target reaction force Fr_tar (n) [N] (that is, the output characteristic of the pedal reaction force Fr).
- the target engine speed Ne_tar (n) when the target engine speed Ne_tar (n) is less than a predetermined threshold N0, the target reaction force Fr_tar (n) remains at the lowest value Fr_min (for example, zero).
- the target engine speed Ne_tar (n) is not less than the threshold N0 and not more than the threshold N1
- the target reaction force Fr_tar (n) increases in a linear function.
- the target reaction force Fr_tar (n) becomes the maximum value Fr_max.
- step S4 of FIG. 2 the reaction force ECU 36 transmits a control signal Sr to the motor 38, and controls the output of the motor 38 so that the pedal reaction force Fr by the motor 38 becomes the target reaction force Fr_tar (n). To do.
- FIG. 4 is a flowchart (details of S2 in FIG. 2) for calculating the target engine speed Ne_tar (n).
- FIG. 5 is an explanatory diagram showing a process of calculating the target engine speed Ne_tar (n) as a virtual circuit configuration.
- step S11 of FIG. 4 the reaction force ECU 36 determines the difference between the current engine speed Ne (n) and the previous target engine speed Ne_tar (n ⁇ 1) (hereinafter referred to as “difference ⁇ Ne (n)”). rpm].
- the subtracter 50 performs the calculation.
- step S12 the reaction force ECU 36 determines whether or not the difference ⁇ Ne (n) exceeds a threshold value ⁇ min1 [rpm].
- the comparator 52 performs the determination.
- the threshold value ⁇ min1 is a negative threshold value (for example, ⁇ 500 rpm / sec) for determining that the engine speed Ne has rapidly decreased, and prevents an unintended sudden decrease in the pedal reaction force Fr due to a shift up or the like. Is set as follows.
- the threshold value ⁇ min1 is set as a difference ⁇ Ne that occurs as a result of the shift up or a value near it.
- the reaction force ECU 36 sets the current engine speed Ne (n) as it is to the current target engine speed Ne_tar (n) (Ne_tar (n) ⁇ Ne (n)).
- the reaction force ECU 36 sets a value obtained by adding the limit value ⁇ min2 to the previous target engine speed Ne_tar (n ⁇ 1) as the current target engine speed Ne_tar (n) ⁇ Ne_tar (n) ) ⁇ Ne_tar (n ⁇ 1) + ⁇ min2 ⁇ .
- the limit value ⁇ min2 is a negative set value [rpm] for moderating an unintended decrease in the pedal reaction force Fr, and can be set to the same value as the threshold value ⁇ min1, for example. Therefore, the target reaction force Fr_tar and the reaction force Fr can be reduced gradually by reducing the decrease in the target engine speed Ne_tar by the process of step S14. Thus, the control for limiting the decrease in the target reaction force Fr_tar is referred to as “rate limit control”.
- the current target engine speed Ne_tar (n) set in step S13 or step S14 is used in step S3 of FIG.
- the current target engine speed Ne_tar (n) is temporarily stored in the storage unit 42 (FIG. 1). In the next processing, it is used as the previous target engine speed Ne_tar (n ⁇ 1). In the example of FIG. 5, this processing is performed by the delay unit 54.
- FIG. 6 is a time chart for comparing the reaction force control in the present embodiment with the reaction force control in the comparative example.
- the engine speed Ne1 actual value of the Ne sensor 16
- the operation amount ⁇ 1 of the accelerator pedal 30 are common to both the present embodiment and the comparative example.
- the comparative example only the normal control (S13 in FIG. 4) is used without using the rate limit control (S14 in FIG. 4) in the present embodiment.
- the relationship between the engine speed Ne (n) in FIG. 3 and the target reaction force Fr_tar (n) in the normal control is used.
- the target reaction force Fr_tar used in the comparative example is expressed as a target reaction force Fr_c
- the target reaction force Fr_tar used in the present embodiment is expressed as a target reaction force Fr_tar1 to distinguish them.
- the target reaction force Fr_tar1 and the target reaction force Fr_c increase as the engine speed Ne1 increases.
- the transmission 18 is shifted up from the third speed to the fourth speed.
- the engine speed Ne rapidly decreases.
- the target reaction force Fr_c also rapidly decreases in accordance with the rapid decrease in the engine speed Ne.
- the target reaction force Fr_c decreases to the lowest value Fr_min at time t13.
- the target reaction force Fr_tar1 decreases gradually even if the engine speed Ne1 rapidly decreases. Therefore, in the present embodiment, the target reaction force Fr_tar1 reaches the minimum value Fr_min at time t14 after time t13.
- the target reaction force Fr_tar1 reaches the minimum value Fr_min, and the engine speed Ne1 again exceeds the threshold value N0. Furthermore, the difference ⁇ Ne (n) exceeds the threshold value ⁇ min1 at time t14 (S12 in FIG. 4: YES). Therefore, in the present embodiment, the first rate limit control is terminated at time t14.
- the engine speed Ne1 becomes equal to or greater than the threshold value N0, and the difference Ne (n) remains above the threshold value ⁇ min1, so that the target reaction force Fr_tar1 and the target reaction force Fr_c according to the increase in the engine speed Ne1. Will increase.
- the same processing is performed when the transmission 18 is shifted up from the fourth speed to the fifth speed at a subsequent time t15.
- the target reaction force Fr_tar1 decreases linearly from time t12 to time t14.
- the threshold ⁇ min1 is set to ⁇ 500 rpm / sec, for example, the rate immediately after time t12 Limit control is not started and normal control is performed. The same applies to the case immediately after time t15.
- the rate limit control (S14) is performed to reverse the pedal.
- Limit the rate of decrease of force Fr for this reason, for example, a decrease in the engine speed Ne (for example, a decrease in the engine speed Ne at the time of upshifting) in a state where the position of the accelerator pedal 30 is left as it is or a state where the accelerator pedal 30 is being depressed (not intended or predicted by the driver)
- the engine speed Ne decreases due to entering a steep uphill road, it is possible to avoid a sudden decrease in the pedal reaction force Fr. Accordingly, it is possible to prevent the driver from feeling uncomfortable due to such a sudden decrease in the pedal reaction force Fr.
- the rate of reduction of the pedal reaction force Fr is temporarily limited by rate limit control. For this reason, it is possible to avoid a sudden decrease in the pedal reaction force Fr even when the engine speed Ne decreases with the shift up. Accordingly, it is possible to prevent the driver from feeling uncomfortable due to such a sudden decrease in the pedal reaction force Fr.
- the vehicle 10 is an automatic transmission vehicle (AT vehicle), but is not limited thereto.
- AT vehicle automatic transmission vehicle
- MT vehicle manual transmission vehicle
- electric vehicle including a hybrid vehicle and a fuel cell vehicle having a transmission in which a plurality of shift speeds are set in advance.
- the transmission 18 is an automatic transmission including a torque converter, but the type of the transmission 18 is not limited to this.
- the present invention is also applicable to a continuously variable transmission (CVT) that is used by setting a plurality of shift stages in advance. It can also be used for a manual transmission (MT).
- CVT continuously variable transmission
- MT manual transmission
- rate limit control is used when the difference ⁇ Ne (n) is equal to or less than the threshold value ⁇ min1 (eg, when the transmission 18 is upshifted), but rate limit control is used.
- the scene is not limited to this.
- rate limit control can be used only when the transmission 18 is upshifted.
- the determination of whether or not there is a shift up can be made based on, for example, the control signal St that the reaction force ECU 36 instructs the transmission 18 to shift. Further, when the vehicle 10 is an MT vehicle, it is possible to determine whether or not there is a shift up based on an output signal from a shift position sensor (not shown).
- the difference between the current reaction force Fr (n) (actual value) and the previous target reaction force Fr_tar (n ⁇ 1) (target value), or the current reaction force Fr (n) (actual value) and the previous is also possible to perform the switching by comparing the difference from the reaction force Fr (n ⁇ 1) (actually measured value) with a threshold value (change amount limit value, corresponding to the threshold value ⁇ min1).
- the change of the target reaction force Fr_tar and the reaction force Fr is limited by performing the rate limit control on the target engine speed Ne_tar. Not limited to this. For example, it is possible to perform rate limit control on the target reaction force Fr_tar itself.
- Threshold value ⁇ min1 and limit value ⁇ min2 (A)
- the threshold value ⁇ min1 (S12 in FIG. 4) and the limit value ⁇ min2 (S14 in FIG. 4) in the rate limit control are one type (fixed value), but a plurality of threshold values ⁇ min1 or a plurality of limit values are used. It is also possible to use ⁇ min2.
- FIG. 7 shows a flowchart of a modification of the control (a combination of FIGS. 2 and 4) in the above embodiment.
- the threshold value ⁇ min1 can be made variable, and a plurality of values can be set as the threshold value ⁇ min1.
- Step S21 in FIG. 7 is the same as step S1 in FIG.
- step S ⁇ b> 22 the reaction force ECU 36 acquires the pedal operation amount ⁇ (hereinafter referred to as “pedal operation amount ⁇ (n)”) used in the current process from the operation amount sensor 34.
- step S23 in FIG. 7 is the same as step S11 in FIG.
- a threshold value ⁇ min1 (hereinafter referred to as “threshold value ⁇ min1 (n)”) in the current process is set. That is, in step S24, the reaction force ECU 36 determines whether or not the pedal operation amount ⁇ (n) exceeds a threshold related to the pedal operation amount ⁇ (hereinafter referred to as “threshold TH_ ⁇ ”).
- the threshold value TH_ ⁇ is a threshold value for determining an intention to end acceleration by the driver (that the driver does not need further acceleration).
- the reaction force ECU 36 sets the threshold value D1 as the threshold value ⁇ min1 (n) in step S25.
- the threshold value D1 can be set, for example, to the same value (for example, ⁇ 500 rpm / sec) as the threshold value ⁇ min1 as a fixed value in the embodiment (FIG. 4).
- the reaction force ECU 36 sets the threshold value D2 as the threshold value ⁇ min1 (n) in step S26.
- the threshold value D2 is a negative value (for example, ⁇ 10000 rpm / sec) whose absolute value is larger than the threshold value D1 (
- Steps S27 to S29 are the same as steps S12 to S14 in FIG.
- the threshold value ⁇ min1 (n) used in step S27 of FIG. 7 can take the threshold value D1 or the threshold value D2.
- the threshold value D1 is the same value as the threshold value ⁇ min1 (fixed value) in FIG. 4
- the threshold value D2 is a negative value whose absolute value is larger than the threshold value ⁇ min1 (fixed value) in FIG.
- step S27 the possibility that the difference ⁇ Ne (n) is less than the threshold value ⁇ min1 (n) is reduced.
- the limit value ⁇ min2 used in step S29 in FIG. 7 is not a fixed value, but can be changed in accordance with the threshold value ⁇ min1 (n).
- Steps S30 and S31 are the same as steps S3 and S4 in FIG.
- FIG. 8 is a time chart for comparing the reaction force control in the embodiment and the comparative example described in FIG. 6 with the reaction force control shown in FIG.
- the engine speed Ne1 and the operation amount ⁇ 1 of the accelerator pedal 30 are the same as those in FIG. 6, and are common to the above embodiment and the comparative example. Further, the engine speed Ne2 and the operation amount ⁇ 2 of the accelerator pedal 30 are for this modification.
- the target reaction force Fr_tar in the above embodiment is expressed as “target reaction force Fr_tar1”
- the target reaction force Fr_tar in this modification is expressed as “target reaction force Fr_tar2”
- the target reaction force Fr_tar used in the comparative example is “ Each is distinguished by being expressed as “target reaction force Fr_c”.
- time t21 to time t25 is the same as time t11 to time t15 in FIG. 6, and there is basically no difference between this embodiment and this modification.
- the pedal operation amount ⁇ 2 becomes equal to or less than the threshold value TH_ ⁇ at time t27 (FIG. 7 S24: NO).
- the threshold value ⁇ min1 (n) used in this modification is switched from the threshold value D1 to the threshold value D2.
- the target reaction force Fr_tar2 of the present modified example has a decreasing rate (a steep slope) compared to the target reaction force Fr_tar1 of the above embodiment, and reaches the minimum value Fr_min at the time point t28. .
- the target reaction force Fr_tar2 of the present modification reaches the minimum value Fr_min earlier than the target reaction force Fr_tar1 of the above embodiment that has reached the minimum value Fr_min at time t29.
- the reaction force ECU 36 is based on the pedal operation amount ⁇ (pedal operation amount ⁇ 2) detected by the operation amount sensor 34, and the threshold value ⁇ min1 (n) (decrease in the pedal reaction force Fr). Rate).
- the rate of decrease in the pedal reaction force Fr can be corrected based on the pedal operation amount ⁇ , so that the pedal reaction force Fr can be controlled more precisely. That is, the driver's intention to accelerate, decelerate, and constant speed travel (cruising) can be determined according to the operation of the accelerator pedal 30 (pedal operation amount ⁇ ), so the pedal according to the pedal operation amount ⁇ .
- the reduction rate of the reaction force Fr it is possible to apply the pedal reaction force Fr more in line with the driver's intention.
- the reaction force ECU 36 has an absolute value greater than the threshold value D1 when the pedal operation amount ⁇ (pedal operation amount ⁇ 2) detected by the operation amount sensor 34 is equal to or less than the threshold value TH_ ⁇ .
- the restriction on the decrease rate of the pedal reaction force Fr is relaxed (allowing a more rapid decrease in the pedal reaction force Fr).
- the pedal operation amount ⁇ is equal to or less than the threshold value TH_ ⁇ , it is possible to relax the restriction on the decrease rate of the pedal reaction force Fr and accelerate the decrease of the pedal reaction force Fr.
- the pedal operation amount ⁇ is large, the driver is more likely to have an intention to accelerate, and when the pedal operation amount ⁇ is small, the driver is more likely to have a deceleration intention.
- the driver often decelerates the vehicle 10 and then shifts the vehicle 10 to reacceleration or constant speed travel.
- the accelerator pedal 30 is depressed again.
- the pedal reaction force Fr is large at this time, the driver may feel uncomfortable.
- the threshold TH_ ⁇ is used to determine whether or not the driver intends to end acceleration, and when it is determined that the driver has an intention to end acceleration, the pedal reaction force Fr is reduced early and the subsequent reactivation is performed. It becomes possible to prepare for acceleration or constant speed running. Therefore, the driver's operation of the accelerator pedal 30 leading to subsequent reacceleration or constant speed traveling can be made smooth.
- the absolute value of the threshold value ⁇ min1 (n) is increased when the pedal operation amount ⁇ is equal to or less than the threshold value TH_ ⁇ . Conversely, when the pedal operation amount ⁇ is equal to or greater than the threshold value TH_ ⁇ , the threshold value is decreased. It is also possible to reduce ⁇ min1 (n).
- the value which threshold value (DELTA) min1 (n) can take may be three or more. In this case, the pedal operation amount ⁇ and the value of the threshold value ⁇ min1 can be mapped and stored.
- the driver's intention to end acceleration is not determined based on the pedal operation amount ⁇ , but the driver is determined based on a decrease amount per unit time of the pedal operation amount ⁇ (hereinafter referred to as “decrease rate ⁇ ”) [° / sec]. It is also possible to determine the intention of ending acceleration. Specifically, a threshold value regarding the reduction rate ⁇ (hereinafter referred to as “threshold value TH_ ⁇ ”) is set, and when the reduction rate ⁇ exceeds the threshold value TH_ ⁇ , it is determined that the driver intends to end acceleration, and the threshold value ⁇ min1 (n ) Can be increased. Further, the reduction rate ⁇ and the value of the threshold value ⁇ min1 can be mapped and stored and used.
- the reduction rate of the target engine speed Ne_tar is limited using the limit value ⁇ min2 [rpm] as a specific value of the engine speed Ne, but the target engine speed Ne_tar
- the method for limiting the decrease rate is not limited to this.
- the current target engine speed Ne_tar (n) may be limited so as not to be smaller than a value obtained by multiplying the previous target engine speed Ne_tar (n ⁇ 1) by a coefficient ⁇ (0 ⁇ ⁇ 1). Is possible.
- the reduction rate of the target reaction force Fr_tar is directly limited instead of the target engine speed Ne_tar.
Abstract
Description
1.車両10の構成
図1は、この発明の一実施形態に係る車両用アクセルペダル装置12(以下「ペダル装置12」という。)を搭載した車両10のブロック図である。車両10は、例えば、四輪車である。車両10は、ペダル装置12に加え、エンジン14と、エンジン14のエンジン回転数Ne[rpm]を検出するエンジン回転数センサ16(以下「Neセンサ16」という。)と、変速機18と、車輪20と、変速機18を制御する変速機電子制御装置22(以下「変速機ECU22」という。)とを備える。
次に、本実施形態におけるペダル反力Frの制御について説明する。本実施形態では、基本的に、エンジン回転数Neに基づいてペダル反力Frを制御する。
図2は、反力ECU36がペダル反力Frを制御するフローチャートである。ステップS1において、反力ECU36は、Neセンサ16からエンジン回転数Neを取得する。以下では、今回の処理で取得したエンジン回転数Neを「エンジン回転数Ne(n)」と記載する。
図4は、目標エンジン回転数Ne_tar(n)を算出するフローチャート(図2のS2の詳細)である。図5は、目標エンジン回転数Ne_tar(n)を算出する過程を仮想的な回路構成として示す説明図である。
図6は、本実施形態における反力制御と比較例における反力制御とを比較するためのタイムチャートである。図6において、エンジン回転数Ne1(Neセンサ16の実測値)及びアクセルペダル30の操作量θ1は、本実施形態及び比較例いずれも共通である。また、比較例では、本実施形態におけるレートリミット制御(図4のS14)を用いず、通常制御(図4のS13)のみを用いる。さらに、比較例では、図3におけるエンジン回転数Ne(n)と通常制御における目標反力Fr_tar(n)との関係を用いる。なお、比較例で用いる目標反力Fr_tarを目標反力Fr_cと表記し、本実施形態で用いる目標反力Fr_tarを目標反力Fr_tar1と表記して両者を区別する。
以上のように、本実施形態によれば、差ΔNe(n)が閾値Δmin1以下になったとき(図4のS12:NO)、レートリミット制御(S14)を行ってペダル反力Frの減少率を制限する。このため、例えば、アクセルペダル30の位置をそのままにした状態又は踏込み中の状態での(運転者が意図又は予測しない)エンジン回転数Neの減少(例えば、シフトアップ時のエンジン回転数Neの減少や、急勾配の登坂路に入ったことによるエンジン回転数Neの減少)が発生した場合であっても、ペダル反力Frが急減することを避けることが可能となる。従って、そのようなペダル反力Frの急減による運転者の違和感を防止することが可能となる。
なお、この発明は、上記実施形態に限らず、この明細書の記載内容に基づき、種々の構成を採り得ることはもちろんである。例えば、以下の構成を採用することができる。
上記実施形態において、車両10は、オートマチックトランスミッション車(AT車)としたが、これに限らない。例えば、マニュアルトランスミッション車(MT車)とすることも可能である。さらに、複数の変速段を予め設定した変速機を有する電気自動車(ハイブリッド車及び燃料電池車を含む。)においても用いることができる。
上記実施形態において、変速機18は、トルクコンバータを備えるオートマチックトランスミッションであったが、変速機18の種類はこれに限らない。例えば、複数の変速段を予め設定しておいて用いる無段変速機(CVT)にも適用可能である。また、マニュアルトランスミッション(MT)にも用いることができる。
(1)レートリミット制御の適用場面
上記実施形態では、差ΔNe(n)が閾値Δmin1以下であるとき(変速機18のシフトアップ時など)にレートリミット制御を用いたが、レートリミット制御を用いる場面はこれに限らない。例えば、変速機18のシフトアップ時のみレートリミット制御を用いることもできる。シフトアップの有無の判定は、例えば、反力ECU36が、変速機18に対して変速を指令する制御信号Stに基づいて行うことができる。また、車両10がMT車である場合、シフト位置センサ(図示せず)からの出力信号に基づいてシフトアップの有無を判定することもできる。
上記実施形態では、今回のエンジン回転数Ne(n)(実測値)と前回の目標エンジン回転数Ne(n-1)(目標値)との差ΔNe(n)を用いて通常制御とレートリミット制御を切り替えた(図4のS12~S14)。しかし、これに限らず、通常制御とレートリミット制御の切替えは、別の数値に基づいて行ってもよい。例えば、今回のエンジン回転数Ne(n)(実測値)と前回のエンジン回転数Ne(n-1)(実測値)との差を閾値(変化量の制限値。閾値Δmin1に相当)と比較して当該切替えを行うこともできる。また、今回の反力Fr(n)(実測値)と前回の目標反力Fr_tar(n-1)(目標値)との差、又は今回の反力Fr(n)(実測値)と前回の反力Fr(n-1)(実測値)との差を閾値(変化量の制限値。閾値Δmin1に相当)と比較して当該切替えを行うこともできる。
上記実施形態では、目標エンジン回転数Ne_tarについてレートリミット制御を行うことにより、目標反力Fr_tar及び反力Frの変化を制限したが、レートリミット制御の適用対象はこれに限らない。例えば、目標反力Fr_tar自体に対してレートリミット制御を行うことも可能である。
(a) 上記実施形態では、レートリミット制御における閾値Δmin1(図4のS12)及びリミット値Δmin2(図4のS14)を1種類(固定値)としたが、複数の閾値Δmin1又は複数のリミット値Δmin2を用いることも可能である。
Claims (6)
- アクセルペダル(30)にペダル反力を付与する反力付与手段(38)を備える車両用アクセルペダル装置(12)であって、
エンジン回転数を検出するエンジン回転数検出手段(16)と、
前記反力付与手段(38)が付与するペダル反力を前記エンジン回転数に基づいて制御する反力制御手段(36)と
をさらに有し、
前記反力制御手段(36)は、前記エンジン回転数の減少率が所定値以上になったとき、前記ペダル反力の減少率を制限する
ことを特徴とする車両用アクセルペダル装置(12)。 - 請求項1記載の車両用アクセルペダル装置(12)において、
前記車両用アクセルペダル装置(12)は、前記アクセルペダル(30)のペダル操作量を検出するペダル操作量検出手段(34)をさらに備え、
前記反力制御手段(36)は、前記ペダル操作量検出手段(34)により検出されたペダル操作量に基づき、前記ペダル反力の減少率を補正する
ことを特徴とする車両用アクセルペダル装置(12)。 - 請求項2記載の車両用アクセルペダル装置(12)において、
前記反力制御手段(36)は、前記ペダル操作量検出手段(34)により検出されたペダル操作量が、運転者の加速終了意図を判定するための第2所定値以下であるとき、前記ペダル反力の減少率の制限を緩和する
ことを特徴とする車両用アクセルペダル装置(12)。 - 請求項1~3のいずれか1項に記載の車両用アクセルペダル装置(12)において、
前記車両用アクセルペダル装置(12)は、予め設定された変速段に基づいてエンジン(14)の出力回転を変速して車輪(20)に伝達する変速機(18)をさらに備え、
前記反力制御手段(36)は、前記変速機(18)のシフトアップに伴って前記エンジン回転数の減少率が前記所定値以上になったとき、前記ペダル反力の減少率を制限する
ことを特徴とする車両用アクセルペダル装置(12)。 - 請求項1~4のいずれか1項に記載の車両用アクセルペダル装置(12)において、
前記反力制御手段(36)は、
前記エンジン回転数検出手段(16)の出力結果から前記エンジン回転数の目標値である目標エンジン回転数を算出し、
前記エンジン回転数検出手段(16)から得た今回のエンジン回転数と前回の目標エンジン回転数との差分が、負の閾値よりも小さい場合、前記ペダル反力の減少率を制限する
ことを特徴とする車両用アクセルペダル装置(12)。 - アクセルペダル(30)にペダル反力を付与する反力付与手段(38)を備える車両用アクセルペダル装置(12)におけるペダル反力制御方法であって、
エンジン回転数検出手段(16)によりエンジン回転数を検出し、
前記反力付与手段(38)が付与するペダル反力を反力制御手段(36)により前記エンジン回転数に基づいて制御し、
前記反力制御手段(36)では、前記エンジン回転数の減少率が所定値以上になったとき、前記ペダル反力の減少率を制限する
ことを特徴とするペダル反力制御方法。
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US8532900B2 (en) | 2013-09-10 |
JP5367155B2 (ja) | 2013-12-11 |
JPWO2012039181A1 (ja) | 2014-02-03 |
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