JP2009215925A - Vehicle and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make control opening used for control correspond to a vehicle speed for an accelerator opening in a special traveling mode different from a normal traveling mode. <P>SOLUTION: When the normal traveling mode is set, the accelerator opening Acc is set as a control opening Acc* as it is. When a fuel economy priority traveling mode is set, the control opening Acc* is set by using a map for setting the control opening. The map is set so that a low-sensitivity area in which the control opening Acc* is set to be smaller than the accelerator opening Acc has an accelerator opening range getting larger as the vehicle speed V gets higher and so that the low-sensitivity area includes the accelerator opening Acc necessary for constant speed travel. Power outputted from a power output device is reduced and an output of excessive power from the power output device is suppressed. Therefore, the fuel economy is improved. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle and a control method therefor, and more specifically, a power output device that outputs a driving force for traveling, an accelerator opening detecting unit that detects an accelerator opening based on an accelerator operation amount of a driver, and a vehicle speed detection. The present invention relates to a vehicle including a vehicle speed detecting means and a method for controlling such a vehicle.

Conventionally, in this type of vehicle, when the power mode is set, the relationship between the accelerator opening and the execution accelerator opening is such that the execution accelerator opening is set larger than the relationship in the normal mode. There has been proposed one in which the accelerator opening for execution is set by using the driving force based on the set accelerator opening for execution (see, for example, Patent Document 1). In this vehicle, the accelerator opening is set to the execution accelerator opening as it is in the normal mode, and the execution accelerator opening larger than the accelerator opening is set in the power mode.
JP2007-91073A

  In the above-described vehicle, when the power mode is set, a large execution accelerator opening is set so that a larger driving force is set and the vehicle is driven with a larger power. However, the driving force is set according to the vehicle speed. It is desirable to take vehicle speed into account. In particular, in the fuel efficiency priority mode that prioritizes fuel efficiency compared to the normal mode, a low-sensitivity execution accelerator opening is set to reduce the change in the accelerator opening relative to the change in the accelerator opening. Thus, it is possible to suppress the output of excessive power, but the setting of the accelerator opening for execution with low sensitivity differs depending on the vehicle speed.

  The vehicle and the control method thereof according to the present invention mainly have a control opening used for control corresponding to the vehicle speed with respect to the accelerator opening in the special travel mode different from the normal travel mode.

  The vehicle and the control method thereof according to the present invention employ the following means in order to achieve the main object described above.

The vehicle of the present invention
A vehicle comprising: a power output device that outputs a driving force for traveling; an accelerator opening detecting unit that detects an accelerator opening based on an accelerator operation amount of a driver; and a vehicle speed detecting unit that detects a vehicle speed. ,
Driving mode selection means for switching between and selecting a normal driving mode and a special driving mode different from the normal driving mode;
When the normal travel mode is selected by the travel mode selection means, the control opening is established using the first relationship regardless of the vehicle speed as the relationship between the accelerator opening and the control opening and the detected accelerator opening. When the special travel mode is selected by the travel mode selection means, the relationship between the accelerator opening and the control opening is different depending on the vehicle speed, and the detected accelerator A control opening setting means for setting the control opening using the opening;
Requested driving force setting means for setting a requested driving force required for traveling based on the set control opening;
Control means for controlling the power output device to travel based on the set required driving force;
It is a summary to provide.

  In the vehicle according to the present invention, when the normal travel mode is selected, the first opening relationship regardless of the vehicle speed and the detected accelerator opening amount are used as the relationship between the accelerator opening amount and the control opening amount. Set the opening and control the power output device to drive with the driving force based on the set control opening, and when the special driving mode different from the normal driving mode is selected, the accelerator opening and the control opening The power output device is set so that the control opening is set using the second relation and the accelerator opening that are different depending on the vehicle speed as well as the driving force based on the set control opening. Control. With such control, the control opening used for control with respect to the accelerator opening can be made to correspond to the travel mode and the vehicle speed.

  In such a vehicle of the present invention, the control opening degree setting means, when the travel mode setting means has selected the fuel efficiency priority travel mode that gives priority to fuel efficiency as compared to the normal travel mode as the special travel mode, Means for setting the control opening using the relationship in which the low sensitivity region in which the control opening is set smaller than the first relationship becomes a region of a larger accelerator opening as the vehicle speed increases as the second relationship; It can also be. In this way, it is possible to suppress setting of an excessive amount of control opening when the fuel efficiency priority driving mode is selected, and to prevent excessive power from being output from the power output device. can do. As a result, fuel consumption can be improved.

  In the vehicle of the present invention, the control opening degree setting means may be configured such that when the travel mode setting means selects the fuel efficiency priority travel mode that gives priority to fuel efficiency as compared to the normal travel mode as the special travel mode. The control opening degree is set using the relation in which the low sensitivity area where the opening degree for control is set smaller than that in the first relation includes the accelerator opening degree necessary for traveling at a constant speed is used as the second relation. It can also be a means for setting. If it carries out like this, it can suppress that the opening degree for control of an excessive change amount with respect to the accelerator operation from constant speed driving | running | working can be suppressed, and it can suppress that excess power is output from a power output device. be able to. As a result, fuel consumption can be improved.

  Further, in the vehicle according to the present invention, the control opening degree setting means, when the low friction coefficient road surface traveling mode for traveling on a road surface having a small friction coefficient is selected as the special traveling mode by the traveling mode setting means, The low sensitivity region in which the control opening is set smaller than the first relationship is a means for setting the control opening using the relationship in which the accelerator opening is increased as the vehicle speed increases as the second relationship. It can also be. In this way, it is possible to suppress the setting of the control opening with an excessive change amount with respect to the accelerator operation in traveling on the road surface with a low friction coefficient, and excessive power is output from the power output device and slips. Can be suppressed.

  Alternatively, in the vehicle of the present invention, the first relationship and the second relationship are as follows: when the accelerator opening is 0%, the control opening is 0%, and when the accelerator opening is 100%, the control opening. It can also be assumed that the relationship is set to 100%. In this way, it is possible to reflect the driver's intention when the accelerator opening is set to 0% or 100%.

The vehicle control method of the present invention includes:
A vehicle control method comprising: a power output device that outputs a driving force for traveling; an accelerator opening detection unit that detects an accelerator opening based on an accelerator operation amount of a driver; and a vehicle speed detection unit that detects a vehicle speed. Because
When the normal travel mode is selected, the control opening is set using the first relationship that is not related to the vehicle speed and the detected accelerator opening as the relationship between the accelerator opening and the control opening. When the power output device is controlled to travel with a driving force based on the set control opening, and the fuel efficiency priority travel mode in which fuel efficiency is prioritized as compared to the normal travel mode is selected, the first relationship is satisfied. The low sensitivity region in which the control opening is set to be small becomes a region where the accelerator opening is increased as the vehicle speed increases, or the low sensitivity region in which the control opening is set to be smaller than the first relationship travels at a constant speed. The control opening is set using the second relationship, which is one of the relationships including the accelerator opening necessary for the control, and the detected accelerator opening, and the set control is performed. To control the power output device to travel by the driving force based on the opening,
It is characterized by that.

  In the vehicle control method of the present invention, when the normal travel mode is selected, the first relationship irrespective of the vehicle speed and the detected accelerator opening are used as the relationship between the accelerator opening and the control opening. The power output device is controlled so as to travel with the driving force based on the set control opening, and the fuel consumption priority traveling mode that gives priority to fuel consumption compared to the normal traveling mode is selected. Sometimes the low sensitivity region where the control opening is set smaller than the first relationship becomes a region where the accelerator opening becomes larger as the vehicle speed increases, or the low sensitivity region where the control opening is set smaller than the first relationship The control opening is set using the second relation which is one of the relations including the accelerator opening necessary for traveling at a constant speed and the detected accelerator opening. Controlling the power output apparatus to travel by the driving force based on the boss was a control opening. As a result, it is possible to suppress an excessive change amount of the control opening degree from being set when the fuel efficiency priority traveling mode is selected, and to prevent excessive power from being output from the power output device. be able to. As a result, fuel consumption can be improved. In addition, it is possible to suppress the setting of the control opening amount that is excessively changed with respect to the accelerator operation from the constant speed traveling.

  Next, the best mode for carrying out the present invention will be described using examples.

  FIG. 1 is a configuration diagram showing an outline of the configuration of a hybrid vehicle 20 as an embodiment of the present invention. The hybrid vehicle 20 according to the embodiment includes a power output device 30 that outputs power to a drive shaft 22 connected to drive wheels 26a and 26b via a differential gear 24, and an electronic device that controls the power output device 30 as shown in the figure. And a control unit 50.

  The power output device 30 includes an engine 32 driven by a hydrocarbon-based fuel such as gasoline or light oil, a planetary gear mechanism 38 having a carrier connected to the crankshaft 34 of the engine 32 and a ring gear connected to the drive shaft 22. The planetary gear mechanism 38 includes a motor 40 having a rotation shaft attached to the sun gear, a motor 41 having a rotation shaft attached to the drive shaft 22, inverters 42 and 43 that drive the motors 40 and 41, and motors 40 and 41. And a battery 44 capable of exchanging power.

  The electronic control unit 50 is configured as a microprocessor centered on the CPU 52. In addition to the CPU 52, a ROM 54 that stores processing programs, a RAM 56 that temporarily stores data, input / output ports and communication ports (not shown), and the like. Is provided. The electronic control unit 50 includes an ignition signal from the ignition switch 60, a shift position SP from the shift position sensor 62 that detects the operation position of the shift lever 61, and an accelerator pedal position sensor 64 that detects the amount of depression of the accelerator pedal 63. The accelerator opening Acc, the brake pedal position BP from the brake pedal position sensor 66 for detecting the depression amount of the brake pedal 65, the vehicle speed V from the vehicle speed sensor 68, the mode switch signal MSW from the travel mode switch 69, and the state of the engine 32 Signals from various sensors (not shown) to be detected, signals from sensors (not shown) to detect the positions of the rotors of the motors 40 and 41, and phase currents that are attached to the inverters 42 and 43 and applied to the motors 40 and 41 are detected. Such as a phase current from a current sensor (not shown) is input via the input port. Further, the electronic control unit 50 outputs a fuel injection valve for operating the engine 32, a drive signal to an actuator such as a throttle, a spark plug, an intake valve opening / closing timing mechanism, a switching control signal to the inverters 42, 43, and the like. It is output through the port. Here, in the embodiment, the travel mode switch 69 includes a normal travel mode that achieves both a certain level of responsiveness and a relatively good fuel efficiency with respect to the driver's operation of the accelerator pedal 63, and a driver's accelerator pedal 63. This switch is used to switch the fuel consumption priority travel mode to improve the fuel efficiency even if the response to the operation is slightly inferior, and the fuel efficiency priority travel mode is set when the travel mode switch 69 is on (mode switch signal MSW is on). When the travel mode switch 69 is off (mode switch signal MSW is off), the normal travel mode is set.

  The hybrid vehicle 20 of the embodiment thus configured calculates a required torque to be output to the drive shaft 22 based on the accelerator opening Acc and the vehicle speed V corresponding to the depression amount of the accelerator pedal 63 by the driver. The operation of the engine 23, the motor 40, and the motor 41 is controlled so that the required power corresponding to the torque is output to the drive shaft 22. As the operation control of the engine 32, the motor 40, and the motor 41, the operation of the engine 32 is controlled so that the power corresponding to the sum of the required power and the power necessary for charging / discharging of the battery 44 is output from the engine 32 and the battery 44. The motor 40 is configured such that all or part of the power output from the engine 32 with the charging / discharging of the motor is output to the drive shaft 22 with the torque conversion by the planetary gear mechanism 38, the motor 40, and the motor 41. In addition, there are an engine operation mode in which the motor 41 is driven and controlled, and a motor running mode in which the operation of the engine 32 is controlled so as to output to the drive shaft 22 power corresponding to the required power from the motor 41.

  Next, the operation of the hybrid vehicle 20 of the embodiment, particularly, the operation when traveling with the control opening Acc * set with respect to the accelerator opening Acc according to the travel mode will be described. FIG. 2 is a flowchart illustrating an example of a drive control routine executed by the electronic control unit 50 of the embodiment. This routine is executed every predetermined time (for example, every several milliseconds).

  When the drive control routine is executed, first, the CPU 52 of the electronic control unit 50 first determines the accelerator opening Acc from the accelerator pedal position sensor 64, the rotational speeds Nm1 and Nm2 of the motors 40 and 41, the vehicle speed V from the vehicle speed sensor 68, A process of inputting data necessary for control such as the mode switch signal MSW from the travel mode switch 69 and the input / output limits Win and Wout of the battery 44 is executed (step S100). Here, the rotational speeds Nm1 and Nm2 of the motors 40 and 41 are input based on the rotational positions of the rotors of the motors 40 and 41 detected by a sensor (not shown) that detects the rotational position of the rotor. It was supposed to be. The input / output limits Win and Wout of the battery 44 are set based on the temperature of the battery 44 and the remaining capacity (SOC) of the battery 44.

  Next, it is determined based on the input mode switch signal MSW whether the normal travel mode is set or the fuel consumption priority travel mode is set (step S110). When the normal travel mode is set, the accelerator opening degree Acc is determined. Is set to the control opening Acc * as it is (step S120), and when the fuel efficiency priority driving mode is set, the control opening Acc * is set based on the accelerator opening Acc and the vehicle speed V (step S130). . Here, the opening degree Acc * for control when the fuel consumption priority traveling mode is set is, in the embodiment, set by previously setting the relationship among the accelerator opening degree Acc, the vehicle speed V, and the control opening degree Acc *. The opening degree map is stored in the ROM 54, and when the accelerator opening degree Acc and the vehicle speed V are given, the corresponding control opening degree Acc * is derived and set from the map. An example of the control opening degree setting map is shown in FIG. As shown in the figure, the control opening degree Acc * is set as a larger accelerator opening range as the vehicle speed V increases in a low sensitivity region that is set smaller than the accelerator opening degree Acc. And it is preferable that this low sensitivity area | region becomes an area | region including accelerator opening Acc required for driving | running | working at constant speed. By doing so, the amount of change in the control opening Acc * when the driver depresses or returns the accelerator pedal 63 while traveling at a constant speed can be made smaller than the amount of change in the accelerator opening Acc. Further, it is possible to suppress an excessive change in the control opening degree Acc *. In the control opening setting map of the embodiment, regardless of the vehicle speed V, the control opening Acc * is also 0% when the accelerator opening Acc is 0%, and the control is performed when the accelerator opening Acc is 100%. The opening degree Acc * is also set to be 100%. As a result, the control opening degree Acc * corresponding to the accelerator opening degree Acc can be set when the driver fully returns the accelerator pedal 63 or when the driver fully depresses the accelerator pedal 63.

  When the control opening Acc * is set in this way, the engine 32 is required to output the required torque Tr * to be output to the drive shaft 22 as the torque required for the vehicle based on the set control opening Acc * and the vehicle speed V. Is set (step S140), and a target rotational speed Ne * and a target torque Te * of the engine 22 are set based on the set required power Pe * (step S150). Here, in the embodiment, the required torque Tr * is stored in the ROM 54 as a required torque setting map by predetermining the relationship among the control opening Acc *, the vehicle speed V, and the required torque Tr *. When the degree Acc * and the vehicle speed V are given, the corresponding required torque Tr * is derived from the stored map and set. FIG. 4 shows an example of the required torque setting map. The required power Pe * can be calculated as the sum of the set required torque Tr * multiplied by the rotational speed Nr of the drive shaft 22 and the charge / discharge required power Pb * required by the battery 44 and the loss Loss. The rotational speed Nr of the drive shaft 22 can be obtained by multiplying the vehicle speed V by the conversion coefficient k, or can be obtained as the rotational speed Nm2 of the motor 41. Further, the target rotational speed Ne * and the target torque Te * of the engine 22 are set based on the operation line for efficiently operating the engine 22 and the required power Pe *. FIG. 5 shows an example of the operation line of the engine 22 and how the target rotational speed Ne * and the target torque Te * are set. As shown in the figure, the target rotational speed Ne * and the target torque Te * can be obtained from the intersection of the operation line and a curve with a constant required power Pe * (Ne * × Te *).

  Subsequently, the target rotational speed Nm1 * of the motor 40 is calculated by the following equation (1) using the set target rotational speed Ne *, the rotational speed Nr (Nm2) of the drive shaft 22 and the gear ratio ρ of the planetary gear mechanism 38. At the same time, the torque command Tm1 * of the motor 40 is calculated by the equation (2) based on the calculated target rotational speed Nm1 * and the current rotational speed Nm1 (step S160). Here, Expression (1) is a dynamic relational expression for the rotating element of the planetary gear mechanism 380. FIG. 6 is a collinear diagram showing the dynamic relationship between the rotational speed and torque in the rotating element of the planetary gear mechanism 38. In the figure, the left S-axis indicates the rotation speed of the sun gear, which is the rotation speed Nm1 of the motor 40, the C-axis indicates the rotation speed of the carrier, which is the rotation speed Ne of the engine 32, and the R-axis indicates the rotation speed Nm2 of the motor 41. The rotation speed Nr of the ring gear is shown. Equation (1) can be easily derived by using this alignment chart. The two thick arrows on the R axis indicate the torque that the torque Tm1 output from the motor 40 acts on the drive shaft 22 and the torque that the torque Tm2 output from the motor 41 acts on the drive shaft 22. Expression (2) is a relational expression in feedback control for rotating the motor 40 at the target rotational speed Nm1 *. In Expression (2), “k1” in the second term on the right side is a gain of the proportional term. “K2” in the third term on the right side is the gain of the integral term.

Nm1 * = Ne * ・ (1 + ρ) / ρ-Nm2 / ρ (1)
Tm1 * = ρ ・ Te * / (1 + ρ) + k1 (Nm1 * -Nm1) + k2∫ (Nm1 * -Nm1) dt (2)

  When the target rotational speed Nm1 * and the torque command Tm1 * of the motor 40 are thus calculated, the input / output limits Win and Wout of the battery 44 and the calculated torque command Tm1 * of the motor 40 are multiplied by the current rotational speed Nm1 of the motor 40. Torque limits Tmin and Tmax as upper and lower limits of torque that may be output from the motor MG2 by dividing the deviation from the obtained power consumption (generated power) of the motor 40 by the rotational speed Nm2 of the motor 41 are expressed by In addition, the temporary motor torque Tm2tmp as the torque to be output from the motor 41 is calculated by using the required torque Tr *, the torque command Tm1 *, and the gear ratio ρ of the planetary gear mechanism 38. (5) is calculated (step S180), and the temporary motor torque T is calculated using the calculated torque limits Tmin and Tmax. Setting the torque command Tm2 * of the motor 41 as a value obtained by limiting the 2Tmp (step S190). By setting the torque command Tm2 * of the motor 41 in this way, the required torque Tr * output to the drive shaft 22 can be set as a torque limited within the range of the input / output limits Win and Wout of the battery 44. . Equation (5) can be easily derived from the collinear diagram of FIG. 6 described above.

Tmin = (Win-Tm1 * ・ Nm1) / Nm2 (3)
Tmax = (Wout-Tm1 * ・ Nm1) / Nm2 (4)
Tm2tmp = Tr * + Tm1 * / ρ (5)

  When the target rotational speed Ne * and target torque Te * of the engine 32 and the torque commands Tm1 * and Tm2 * of the motors 40 and 41 are set in this way, the operating point indicated by the target speed Ne * and the target torque Te *. The fuel injection control and the ignition control in the engine 32 are controlled so as to be operated at the same time, and the switching elements of the inverters 42 and 43 are controlled to be driven by the torque commands Tm1 * and Tm2 * of the motors 40 and 41. (Step S200), this routine is finished.

  Consider a case where the driver depresses the accelerator pedal 63 slightly while traveling at a constant speed at a vehicle speed V of 50 km / h in the fuel efficiency priority traveling mode. At this time, the region including the accelerator opening Acc when traveling at a constant speed of 50 km / h is the control opening Acc * against the change in the accelerator opening Acc in the control opening setting map of the embodiment. Therefore, the amount of change in the control opening Acc * is smaller than the amount of change in the accelerator opening Acc detected by the accelerator pedal position sensor 64. Since the required torque Tr * and the required power Pe * are set by the control opening Acc *, it is smaller than when the required torque Tr * and the required power Pe * are set by the accelerator opening Acc. The required torque Tr * and the required power Pe * are set. Thereby, since the power output from the engine 32 is also reduced, it is possible to suppress excessive power from being output from the engine 32 and to improve fuel consumption. Next, let us consider a case where the accelerator pedal 63 is depressed to shift to a constant speed at a vehicle speed V of 100 km / h, and then the driver further depresses the accelerator pedal 63. At this time, the region including the accelerator opening Acc when traveling at a constant speed of 100 km / h is the control opening Acc with respect to the change in the accelerator opening Acc in the control opening setting map of the embodiment. Since the change in * becomes a low sensitivity region, the change amount of the control opening Acc * becomes smaller than the change amount of the accelerator opening Acc detected by the accelerator pedal position sensor 64. Output of power from the engine 32 can be suppressed, and fuel consumption can be improved.

  According to the hybrid vehicle 20 of the embodiment described above, when the fuel efficiency priority traveling mode is set, the vehicle speed V is large in the low sensitivity region where the control opening Acc * is set smaller than the accelerator opening Acc. The control opening degree Acc is set using a control opening degree setting map that is set so that the accelerator opening degree range is as large as possible and the low sensitivity region includes the accelerator opening degree Acc necessary for traveling at a constant speed. * Is set, and the required torque Tr * to be output to the drive shaft 22 and the required power Pe * to be output from the engine 32 are set using the set control opening Acc *, and the engine 32, the motor 40, 41, the power output from the engine 32 is higher than when the required torque Tr * and the required power Pe * are set by the accelerator opening Acc. To reduce the over, excessive power can be prevented from being output from the engine 32. As a result, fuel consumption can be improved. On the other hand, when the normal travel mode is set, the accelerator opening Acc is set as it is as the control opening Acc *, and the required torque Tr to be output to the drive shaft 22 using the set control opening Acc *. By setting * and the required power Pe * to be output from the engine 32 and controlling the engine 32 and the motors 40 and 41, the engine 32 can output power corresponding to the accelerator opening Acc and travel. it can.

  In the hybrid vehicle 20 of the embodiment, when the fuel economy priority traveling mode is set, the accelerator opening degree increases as the vehicle speed V increases in the low sensitivity region where the control opening degree Acc * is set smaller than the accelerator opening degree Acc. A control opening degree Acc * is set using a control opening degree setting map that is set so that the low sensitivity area is an area that includes an accelerator opening degree Acc necessary for traveling at a constant speed. However, when the fuel consumption priority driving mode is set, the low sensitivity region where the control opening Acc * is set smaller than the accelerator opening Acc regardless of the constant speed driving is larger as the vehicle speed V increases. The control opening degree Acc * is set using the control opening degree setting map set as the accelerator opening range, or the fuel consumption priority traveling mode is set. The low-sensitivity region in which the control opening Acc * is set smaller than the accelerator opening Acc is a region including the accelerator opening Acc necessary for constant speed traveling. The control opening degree Acc * may be set using the degree setting map. Further, when the fuel efficiency priority travel mode is set, any low sensitivity region in which the control opening degree Acc * is set to be smaller than the accelerator opening degree Acc according to the vehicle speed V changes. I do not care.

  In the hybrid vehicle 20 of the embodiment, the driving mode switch 69 is set by switching between the normal driving mode and the fuel efficiency priority driving mode, and when the fuel efficiency priority driving mode is set, the accelerator opening Acc is controlled. The low sensitivity region where the opening degree Acc * is set to be small is set so that the accelerator opening range becomes larger as the vehicle speed V increases, and this low sensitivity region becomes a region including the accelerator opening degree Acc necessary for constant speed traveling. The control opening degree Acc * is set by using the control opening degree setting map, but the low friction coefficient road surface travel mode (for example, the low friction coefficient road surface travel mode is used as the travel mode switch). , Snow road travel mode), and when the low friction coefficient road surface travel mode is set, The control opening degree Acc is set using a control opening degree setting map in which the low sensitivity region where the control opening degree Acc * is set smaller than the opening degree Acc is set as a larger accelerator opening range as the vehicle speed V increases. * May be set, and when the low friction coefficient road traveling mode is set, the low sensitivity region where the control opening Acc * is set smaller than the accelerator opening Acc travels at a constant speed. Alternatively, the control opening degree Acc * may be set using a control opening degree setting map set so as to be a region including the accelerator opening degree Acc required for this.

  In the hybrid vehicle 20 of the embodiment, the driving mode switch 69 is set by switching between the normal driving mode and the fuel efficiency priority driving mode, and when the fuel efficiency priority driving mode is set, the accelerator opening Acc is controlled. The low sensitivity region where the opening degree Acc * is set to be small is set so that the accelerator opening range becomes larger as the vehicle speed V increases, and this low sensitivity region becomes a region including the accelerator opening degree Acc necessary for constant speed traveling. The control opening degree Acc * is set using the control opening degree setting map. However, the normal driving mode as a driving mode switch, and the power driving mode with better power output response than the normal driving mode, When the power travel mode is set, the accelerator opening degree Acc is controlled. The control opening degree Acc * may be set using a control opening degree setting map in which a high sensitivity area where the opening degree Acc * is set large is set as a larger accelerator opening range as the vehicle speed V increases. Good.

  In the hybrid vehicle 20 of the embodiment, as the control opening degree setting map, regardless of the vehicle speed V, when the accelerator opening degree Acc is 0%, the control opening degree Acc * is also 0%, and the accelerator opening degree Acc is 100%. In this case, the control opening degree Acc * is also set to be 100%. However, the control opening degree Acc * may not be 100% even when the accelerator opening degree Acc is 100%.

  In the hybrid vehicle 20 of the embodiment, the power of the motor 41 in the power output device 30 is output to the drive shaft 22, but as illustrated in the power output device 130 of the hybrid vehicle 120 of the modified example of FIG. The power of 41 may be connected to an axle (an axle connected to the wheels 28a and 28b in FIG. 7) different from an axle to which the drive shaft 22 is connected (an axle to which the drive wheels 26a and 26b are connected). In the hybrid vehicle 20 of the embodiment, the power of the engine 32 in the power output device 30 is output to the drive shaft 22 connected to the drive wheels 26a and 26b via the planetary gear mechanism 38. As illustrated in the power output device 230 of the hybrid vehicle 220 of the modified example, the inner rotor 242 connected to the crankshaft of the engine 32 and the outer rotor 244 connected to the drive shaft 22 that outputs power to the drive wheels 26a and 26b. And a counter-rotor motor 240 that transmits a part of the power of the engine 32 to the drive shaft 22 and converts the remaining power into electric power. Furthermore, as illustrated in the power output device 330 of the electric vehicle 320 in FIG. 9, the battery 44 and the motor 41 that outputs power to the drive shaft 22 connected to the drive wheels 26 a and 26 b may be included.

  Moreover, it is not limited to what is applied to such a hybrid vehicle, It is good also as what is applied to vehicles other than a motor vehicle, and it is good also as a form of the control method of a vehicle.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the power output device 30 corresponds to “power output device”, the accelerator pedal position sensor 64 corresponds to “accelerator opening degree detection means”, the vehicle speed sensor 68 corresponds to “vehicle speed detection means”, and the travel mode The switch 69 corresponds to “travel mode selection means”. When the normal travel mode is set, the accelerator opening Acc is set to the control opening Acc *, and when the fuel consumption priority travel mode is set, the accelerator opening. The low sensitivity region in which the control opening Acc * is set smaller than Acc includes a larger accelerator opening range as the vehicle speed V increases, and this low sensitivity region includes the accelerator opening Acc necessary for traveling at a constant speed. Step S110 of the drive control routine of FIG. 2 for setting the control opening degree Acc * using the control opening degree setting map set so as to become the region. The electronic control unit 50 that executes the process of S130 corresponds to the “control opening degree setting means”, and sets the required torque Tr * based on the control opening degree Acc * and the vehicle speed V in the drive control routine of FIG. The electronic control unit 50 that executes the process of step S140 corresponds to “required drive force setting means” and steps S140 to S140 of the drive control routine of FIG. 2 for controlling the engine 32 and the motors 40 and 41 based on the required torque Tr *. The electronic control unit 50 that executes the process of S200 corresponds to a “control unit”.

  Here, the “power output device” is not limited to the power output device 30, and the power output device 130 illustrated in FIG. 7 in which the motor 41 is connected to a drive shaft different from the drive shaft 22, A power output device 230 illustrated in FIG. 8 that is a counter-rotor motor 240 instead of the planetary gear mechanism 38 and the motor 40, or a power output device 330 in FIG. Or any other device that outputs a driving force for traveling. The “accelerator opening degree detection means” is not limited to the accelerator pedal position sensor 64, and any means may be used as long as it detects the accelerator opening degree based on the driver's accelerator operation amount. The “vehicle speed detection means” is not limited to the vehicle speed sensor 68, and any device that detects the vehicle speed may be used. The “travel mode selection means” is not limited to the travel mode switch 69 for switching between the normal travel mode and the fuel consumption priority travel mode, but may be a travel mode switch for switching between the normal travel mode and the low friction coefficient road surface travel mode. As long as the mode is a travel mode switch for switching between the normal travel mode and the power travel mode, the normal travel mode and the special travel mode different from the normal travel mode can be switched and selected. As the “control opening degree setting means”, the accelerator opening degree Acc is set to the control opening degree Acc * when the normal driving mode is set, and the accelerator opening degree Acc is set when the fuel efficiency priority driving mode is set. On the other hand, the low sensitivity region in which the control opening Acc * is set to be small is set as a region including the accelerator opening Acc necessary for traveling at a constant speed, as the accelerator opening range increases as the vehicle speed V increases. It is not limited to setting the control opening Acc * using the control opening setting map set in such a way that the accelerator opening Acc is used for control when the normal travel mode is set. When the opening degree Acc * is set and the fuel consumption priority traveling mode is set, the low sensitivity region where the control opening degree Acc * is set smaller than the accelerator opening degree Acc is The control opening degree Acc * is set using a control opening degree setting map set as a larger accelerator opening range as the speed V increases, or when the normal travel mode is set, the accelerator opening degree Acc. Is set to the control opening Acc *, and when the fuel efficiency priority driving mode is set, a low sensitivity region where the control opening Acc * is set smaller than the accelerator opening Acc is necessary for constant speed traveling. The control opening degree Acc * is set using a control opening degree setting map that is set so as to be a region including the accelerator opening degree Acc, or when the normal travel mode is set, the accelerator opening degree When Acc is set to the control opening Acc * and the low friction coefficient road surface driving mode is set, the control opening Acc * is set smaller than the accelerator opening Acc. The control opening degree Acc * is set by using a control opening degree setting map that is set as a larger accelerator opening degree range as the vehicle speed V increases, or the normal travel mode is set. The accelerator opening Acc is set to the control opening Acc *, and when the low friction coefficient road running mode is set, the control opening Acc * is set smaller than the accelerator opening Acc. The control opening degree Acc * is set using a control opening degree setting map set so as to be a region including the accelerator opening degree Acc necessary for traveling at a constant speed. When it is set, the accelerator opening Acc is set to the control opening Acc *, and when the power travel mode is set, the control opening A is set with respect to the accelerator opening Acc. The control opening degree Acc * is set using a control opening degree setting map that is set as a larger accelerator opening range as the vehicle speed V increases in the high sensitivity region in which cc * is set to be large. When the normal travel mode is selected by the travel mode selection means, the control opening is set using the first relationship and the accelerator opening regardless of the vehicle speed as the relationship between the accelerator opening and the control opening, When the special travel mode is selected by the travel mode selection means, the control opening using the second relationship and the accelerator opening that are different depending on the vehicle speed as the relationship between the accelerator opening and the control opening. Anything can be used as long as it is set. The “required driving force setting means” is not limited to setting the required torque Tr * based on the control opening Acc * and the vehicle speed V, but is required for traveling based on the control opening. Any desired driving force may be set as long as the required driving force is set. The “control means” is not limited to a single electronic control unit 50, and may be composed of a plurality of electronic control units. Further, the “control means” is not limited to the one that controls the engine 32 and the motors 40 and 41 based on the required torque Tr *, and the power output device is controlled so as to travel based on the required driving force. Any object can be used.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. It is an example for specifically explaining the best mode for doing so, and does not limit the elements of the invention described in the column of means for solving the problem. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  The best mode for carrying out the present invention has been described with reference to the embodiments. However, the present invention is not limited to these embodiments, and various modifications can be made without departing from the gist of the present invention. Of course, it can be implemented in the form.

  The present invention is applicable to the vehicle manufacturing industry.

1 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 20 as an embodiment of the present invention. It is a flowchart which shows an example of the drive control routine performed by the electronic control unit 50 of an Example. It is explanatory drawing which shows an example of the control opening degree setting map. It is explanatory drawing which shows an example of the map for request | requirement torque setting. It is explanatory drawing which shows a mode that an example of the operating line of the engine 32, and target rotational speed Ne * and target torque Te * are set. FIG. 6 is an explanatory diagram showing an example of a collinear diagram for dynamically explaining the rotating elements of the planetary gear mechanism. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 120 according to a modification. FIG. 11 is a configuration diagram showing an outline of a configuration of a hybrid vehicle 220 of a modified example. FIG. 11 is a configuration diagram illustrating an outline of a configuration of a modified example of an electric vehicle 320.

Explanation of symbols

  20, 120, 220 Hybrid vehicle, 22 drive shaft, 24 differential gear, 26a, 26b drive wheel, 28a, 28b wheel, 30, 130, 230, 330 power output device, 32 engine, 34 crankshaft, 38 planetary gear mechanism, 40, 41 Motor, 42, 43 Inverter, 44 Battery, 50 Electronic control unit, 52 CPU, 54 ROM, 56 RAM, 60 Ignition switch, 61 Shift lever, 62 Shift position sensor, 63 Accel pedal, 64 Accel pedal position sensor, 65 brake pedal, 66 brake pedal position sensor, 68 vehicle speed sensor, 69 travel mode switch, 240 rotor motor, 242 inner rotor, 244 outer rotor, 320 Qi car.

Claims (6)

A vehicle comprising: a power output device that outputs a driving force for traveling; an accelerator opening detecting unit that detects an accelerator opening based on an accelerator operation amount of a driver; and a vehicle speed detecting unit that detects a vehicle speed. ,
Driving mode selection means for switching between and selecting a normal driving mode and a special driving mode different from the normal driving mode;
When the normal travel mode is selected by the travel mode selection means, the control opening is established using the first relationship regardless of the vehicle speed as the relationship between the accelerator opening and the control opening and the detected accelerator opening. When the special travel mode is selected by the travel mode selection means, the relationship between the accelerator opening and the control opening is different depending on the vehicle speed, and the detected accelerator A control opening setting means for setting the control opening using the opening;
Requested driving force setting means for setting a requested driving force required for traveling based on the set control opening;
Control means for controlling the power output device to travel based on the set required driving force;
A vehicle comprising:   The control opening degree setting means is controlled from the first relationship when the travel mode setting means selects the fuel efficiency priority travel mode that prioritizes fuel efficiency as compared to the normal travel mode as the special travel mode. 2. The vehicle according to claim 1, wherein the control opening degree is set by using, as the second relation, a relationship in which a low sensitivity area in which the opening degree is set to be small becomes a larger accelerator opening area as the vehicle speed increases. .   The control opening degree setting means is controlled from the first relationship when the travel mode setting means selects the fuel efficiency priority travel mode that prioritizes fuel efficiency as compared to the normal travel mode as the special travel mode. A means for setting a control opening by using, as the second relationship, a relationship in which a low-sensitivity region in which the opening is set small is a region including an accelerator opening necessary for constant speed traveling. The vehicle according to 1.   When the low friction coefficient road surface travel mode for traveling on a road surface having a small friction coefficient is selected as the special travel mode by the travel mode setting means, the control opening degree setting means is controlled according to the first relationship. 2. The vehicle according to claim 1, wherein the control opening is set by using, as the second relationship, a relationship in which a low sensitivity region in which the degree is set to be small becomes a region of a large accelerator opening as the vehicle speed increases.   The first relationship and the second relationship are such that when the accelerator opening is 0%, the control opening is 0%, and when the accelerator opening is 100%, the control opening is set to 100%. The vehicle according to any one of claims 1 to 4. A vehicle control method comprising: a power output device that outputs a driving force for traveling; an accelerator opening detection unit that detects an accelerator opening based on an accelerator operation amount of a driver; and a vehicle speed detection unit that detects a vehicle speed. Because
When the normal travel mode is selected, the control opening is set using the first relationship that is not related to the vehicle speed and the detected accelerator opening as the relationship between the accelerator opening and the control opening. When the power output device is controlled to travel with a driving force based on the set control opening, and the fuel efficiency priority travel mode in which fuel efficiency is prioritized as compared to the normal travel mode is selected, the first relationship is satisfied. The low sensitivity region in which the control opening is set to be small becomes a region where the accelerator opening is increased as the vehicle speed increases, or the low sensitivity region in which the control opening is set to be smaller than the first relationship travels at a constant speed. The control opening is set using the second relationship, which is one of the relationships including the accelerator opening necessary for the control, and the detected accelerator opening, and the set control is performed. To control the power output device to travel by the driving force based on the opening,
A method for controlling a vehicle.

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