JP6307548B2 - vehicle - Google Patents

Description

  The present invention relates to a vehicle including an internal combustion engine and a rotating electrical machine as a driving source for wheels.

  For example, Patent Document 1 discloses a hybrid vehicle that includes an internal combustion engine that drives a drive shaft of a vehicle, a motor that assists driving of the drive shaft with electrical energy, and a power storage unit that supplies electric power to the motor. (Patent Document 1 [0016], FIG. 1).

  In such a hybrid vehicle, the internal combustion engine is started by the rotating electric machine without using a dedicated starter motor for starting.

Japanese Patent Laid-Open No. 11-164406

  In the hybrid vehicle, when the temperature sensor detects that the temperature of the rotating electrical machine has become relatively high during traveling by the rotating electrical machine, it is preferable to start the internal combustion engine and switch to traveling by the internal combustion engine. .

  After switching to traveling by the internal combustion engine, the supply of electrical energy to the rotating electrical machine is cut off, so that the temperature of the rotating electrical machine can be prevented from reaching the upper temperature limit.

  By the way, after the ignition switch is turned off and the internal combustion engine is stopped in a state where the power supply to the rotating electrical machine is cut off, the ignition switch is turned on and the internal combustion engine is started by the rotating electrical machine. , It may not start.

  In other words, since a relatively large driving torque is required when starting the internal combustion engine by the rotating electrical machine, if the internal combustion engine is restarted by the rotating electrical machine before the temperature of the rotating electrical machine has sufficiently decreased, the temperature of the rotating electrical machine This is because there is a risk of reaching the upper heat limit temperature.

  However, if the internal combustion engine cannot be started by the rotating electrical machine until the temperature is sufficiently lowered when the internal combustion engine is started by the rotating electrical machine with the ignition switch turned on, the merchantability of the vehicle is reduced. There is room for improvement.

  In the prior art, if the temperature sensor fails, starting of the internal combustion engine by the rotating electrical machine may be prohibited, and there is room for improvement.

  The present invention has been made in consideration of such problems, and allows the rotating electric machine to start the internal combustion engine as much as possible, and the temperature of the rotating electric machine or the drive circuit of the rotating electric machine is the upper limit heat resistance temperature. An object of the present invention is to provide a vehicle that can prevent the vehicle from reaching the vehicle.

  The vehicle according to the present invention includes an internal combustion engine and a rotating electrical machine capable of driving the vehicle, and the internal combustion engine is started by the rotating electrical machine in response to a start request of the internal combustion engine, and the rotation A temperature sensor that detects the temperature of the electric machine or the temperature of the drive circuit of the rotating electric machine, and an output limiter that limits the output of the rotating electric machine when the detected temperature detected by the temperature sensor exceeds a first threshold temperature Even if the output of the rotating electrical machine is limited, if the detected temperature exceeds a second threshold temperature higher than the first threshold temperature, starting of the internal combustion engine by the rotating electrical machine is prohibited. A start prohibitor.

  According to the present invention, even when the internal combustion engine is stopped in a state where the output of the rotating electrical machine is limited and then the internal combustion engine is to be restarted, it is possible to output the driving torque required for starting the internal combustion engine. As described above, the output of the rotating electrical machine is limited at a temperature lower than the temperature (second threshold temperature) at which starting of the internal combustion engine by the rotating electrical machine is permitted, that is, the first threshold temperature.

  That is, according to the present invention, when the detected temperature of the rotating electrical machine that can start the internal combustion engine or the detected temperature of the drive circuit of the rotating electrical machine exceeds the first threshold temperature, the output of the rotating electrical machine is limited. Thus, basically, the detected temperature is controlled so as not to exceed the second threshold temperature higher than the first threshold temperature, and the start of the internal combustion engine by the rotating electrical machine is allowed, so that the merchantability is prevented from being lowered.

  Even when the output of the rotating electrical machine is limited, if the detected temperature exceeds a second threshold temperature higher than the first threshold temperature, the internal combustion engine is prohibited from starting by the rotating electrical machine. As a result, the rotating electrical machine and the drive circuit of the rotating electrical machine do not reach the upper limit heat resistance temperature and can be prevented from being damaged.

  In this case, the second threshold temperature is higher than the first threshold temperature, but in the temperature range lower than the second threshold temperature, even when the internal combustion engine is started once, It is preferable that the detected temperature is set so as not to reach an upper limit heat-resistant temperature of the rotating electrical machine or the drive circuit.

  According to this invention, while the detected temperature detected by the temperature sensor exceeds the first threshold temperature and the output of the rotating electrical machine is limited, the detected temperature is higher than the first threshold temperature. In the temperature range lower than two threshold temperatures, the internal combustion engine can be started once. For this reason, it is possible to control the detected temperature so as not to reach the upper limit heat resistance temperature of the rotating electrical machine or the drive circuit while enabling the internal combustion engine to be started by the rotating electrical machine.

  When the temperature sensor fails, after the drive torque of the rotating electrical machine becomes zero and after the predetermined time required for the temperature to fall to a temperature at which the internal combustion engine can be started, It is preferable to allow the internal combustion engine to be started by a rotating electrical machine.

  According to the present invention, even when the temperature sensor is out of order, a predetermined time required for the temperature to drop to a temperature at which the internal combustion engine can be started has elapsed after the drive torque of the rotating electrical machine becomes zero. Thereafter, the internal combustion engine can be started by the rotating electrical machine, and the temperature of the rotating electrical machine or a drive circuit of the rotating electrical machine can be prevented from reaching the upper limit heat resistance temperature.

  According to the present invention, even when the internal combustion engine is stopped in a state where the output of the rotating electrical machine is limited and then the internal combustion engine is to be restarted, it is possible to output the driving torque required for starting the internal combustion engine. As described above, the output of the rotating electrical machine is limited at a temperature lower than the temperature (second threshold temperature) at which starting of the internal combustion engine by the rotating electrical machine is permitted, that is, the first threshold temperature.

  That is, according to the present invention, when the detected temperature of the rotating electrical machine that can start the internal combustion engine or the detected temperature of the drive circuit of the rotating electrical machine exceeds the first threshold temperature, the output of the rotating electrical machine is limited. Thus, basically, the detected temperature is controlled so as not to exceed the second threshold temperature higher than the first threshold temperature, and the start of the internal combustion engine by the rotating electrical machine is allowed, so that the merchantability is prevented from being lowered.

  Therefore, according to the present invention, starting of the internal combustion engine by the rotating electrical machine can be allowed to the maximum, and the temperature of the rotating electrical machine or a drive circuit of the rotating electrical machine can be prevented from reaching the upper limit heat resistance temperature.

It is a schematic block diagram of the vehicle which concerns on this embodiment. FIG. 2 is a schematic plan view of the vehicle. 6 is a time chart for explaining the start control operation of the internal combustion engine when the temperature sensor is normal. 6 is a time chart used for explaining the start control operation of the internal combustion engine when the temperature sensor is abnormal.

  Hereinafter, preferred embodiments of a vehicle according to the present invention will be described in detail with reference to the accompanying drawings.

[Constitution]
FIG. 1 is a schematic block diagram of a vehicle 12 including a start controller 74 and the like according to this embodiment.

  FIG. 2 is a schematic plan view of the vehicle 12.

  The vehicle 12 is a hybrid vehicle, and basically includes an internal combustion engine (engine) 14, a rotating electrical machine 16 such as a motor generator, and the internal combustion engine 14 and / or the rotating electrical machine 16 via a drive shaft 18 and a transmission 20. Drive wheels 22 that are rotationally driven.

  The vehicle 12 does not have a starter motor dedicated to starting the internal combustion engine 14 and is configured to start the internal combustion engine 14 by a rotating electrical machine 16 that can drive the vehicle 12.

  1 and 2, a thick solid line indicates mechanical connection, a double solid line indicates a power line, and a solid line indicates a control line or a signal line.

  The rotating electrical machine 16 is rotationally driven by AC power obtained by converting DC power of a power storage device 24 such as a high-voltage battery or a capacitor through a drive circuit 26 when the internal combustion engine 14 is started and during power running. In addition, the rotating electrical machine 16 generates AC power during regeneration and charges the power storage device 24 through the drive circuit 26.

  The rotating electrical machine 16 includes, for example, a stator (not shown) in which a stator winding (not shown) fixed to a housing (not shown) is wound around a tooth, and a gap is provided between the stator and the stator. It is comprised from the rotor (not shown) by which the permanent magnet (not shown) as a rotor arrange | positioned inside was embedded.

  The temperature (winding temperature) Tcoil of the stator winding is detected by a winding temperature sensor 51 provided in the stator.

  The drive circuit 26 includes a switching element (not shown) constituting the inverter and circuit components such as a switching element drive circuit (not shown) and a smoothing capacitor (not shown). In the drive circuit 26, the temperature of the switching element (switching element temperature) Tsw is detected by the switching element temperature sensor (SW element temperature sensor) 52, and the temperature (capacitor temperature) Tc of the capacitor having the lowest upper limit heat resistance temperature among the circuit components is determined. It is detected by the capacitor temperature sensor 53.

  Note that the stator winding and the capacitor wound around the teeth have a large thermal mass, so that the temperature is difficult to decrease, and the switching element has a small thermal mass, and the temperature is likely to decrease.

  In addition to the winding temperature Tcoil, the switching element temperature Tsw, and the capacitor temperature Tc detected by the temperature sensors 51, 52, and 53, the control device 30 includes an ignition signal Sig that represents an on state or an off state from the ignition switch 62, State of switches such as pedal opening (accelerator pedal opening) θap from the accelerator pedal 64 engaged with the accelerator pedal sensor, depression amount (brake depression amount) Bp from the brake pedal 66 engaged with the brake pedal sensor Signals and detection signals of various sensors are supplied.

  The control device 30 is a computer and has a CPU, a memory, a counter timer, and an input / output interface, and functions as various functional units when the CPU executes a program stored in the memory.

  In this embodiment, the control device 30 functions as an output limiter 70 of the rotating electrical machine 16, a start controller 74 that controls the start of the internal combustion engine 14 by the rotating electrical machine 16, a counter timer (timer) 76, and the like. The start controller 74 controls start permission, actual start, and start prohibition of the internal combustion engine 14.

  The control device 30 is connected to components related to the driving of the vehicle 12 such as the internal combustion engine 14, the rotating electrical machine 16, the power storage device 24, and the drive circuit 26, and an ignition signal Sig indicating the on / off state of the ignition switch 62, Based on the accelerator pedal opening θap, the brake depression amount Bp, which are operation signals, and the detected temperatures Tcoil, Tsw, Tc by the temperature sensors 51, 52, 53, etc., a program is executed to control the components.

  The control device 30 may be provided separately for each major component such as the internal combustion engine 14 and the rotating electrical machine 16. When provided separately, each control device is connected by a communication line and is configured to share information and data.

  A notification device 28 is connected to the control device 30, and the control device 30 notifies a passenger through the notification device 28 when necessary. As the notification device 28, a display audio device (including a display device and a speaker) arranged on the dashboard may be substituted.

  In the vehicle 12 configured as described above, the internal combustion engine 14 alone drives the vehicle 12 (the rotating electrical machine 16 idles), the rotating electrical machine 16 alone drives the vehicle 12 (the internal combustion engine 14 idles), the internal combustion engine It is possible to drive the vehicle 12 by using the engine 14 and the rotating electrical machine 16 together. A clutch (connection / disconnection mechanism) may be provided between the internal combustion engine 14 and the rotating electrical machine 16.

  In principle, the internal combustion engine 14 has an ignition switch 62 when it is not necessary to limit (referred to as power saving or power limit) by the output limiter 70 to the rotating electrical machine 16 based on the temperature sensors 51, 52, 53. Is started by the rotating electrical machine 16 at the time of a start request at the time of transition from the off state (Sig = OFF: low level) to the on state (Sig = ON: high level) (at the time of transition from the stop state to the travelable state). When the vehicle is driven by the rotary electric machine 16 alone during traveling, the rotary electric machine 16 is started at the time of a start request when switching from the rotary electric machine 16 single drive to the internal combustion engine 14 single drive. The torque (starting torque) at the time of starting the internal combustion engine 14 by the rotating electrical machine 16 is relatively large and raises the temperature of the rotating electrical machine 16 and the drive circuit 26 to a considerable extent.

[Operation when temperature sensor is normal]
The start control operation of the internal combustion engine 14 by the rotating electrical machine 16 of the vehicle 12 according to this embodiment basically configured as described above will be described with reference to the time chart of FIG. In the time chart of FIG. 3, the winding temperature Tcoil by the winding temperature sensor 51 is described as a representative input value for convenience of understanding.

Each item of the waveform in the time chart of FIG. 3 is as follows.
IG SW: ON / OFF state of the ignition switch 62 {Sig = ON: (high level), Sig = OFF (low level)}.

Operation: “EV” is independent traveling by the rotating electrical machine 16 (EV independent traveling), “ENG” is traveling independently by the internal combustion engine 14 or combined traveling by the internal combustion engine 14 and the rotating electrical machine 16, and “OFF” is internal combustion engine 14 And the stopped state of the rotating electrical machine 16.
Ne: Engine speed [rpm].
Tcoil: Winding temperature.
Threshold temperature magnitude relationship: Tmax>Tsubth>Tpsth> Tevpth.
Tmax: upper limit heat resistant threshold temperature of winding temperature Tcoil.
Tsubth: Start prohibition threshold temperature of the internal combustion engine 14 by the rotating electrical machine 16.
Tpsth: power save threshold temperature for applying power save (power limit) to the rotating electrical machine 16.
Tevpth: EV single travel permission threshold (EV permission threshold) temperature, which is the upper limit temperature at which single operation by the rotating electrical machine 16 is permitted.
Fengst: Internal combustion engine start request flag.
Fst: start permission flag of the internal combustion engine 14
Cpcold: cooling guarantee preset time (preset value).
Ccold: At the time of down count (down count value).
CRKtrq: Cranking torque allowed for the rotating electrical machine 16, MAX is the maximum value, the startable torque of the internal combustion engine 14, PS is a power save value, the internal combustion engine 14 cannot be started, a positive value is the power running side torque, and MIN is The minimum negative value is regeneration side torque (braking torque).

  In the time chart of FIG. 3, the EV travel period by the rotating electrical machine 16 is set between the time point t0 and the time point t1 (see item: operation).

  When the winding temperature Tcoil increases during the EV traveling period and the control device 30 (starting controller 74) determines that the winding temperature Tcoil exceeds the EV single traveling permission threshold temperature Tevpth at the time t1, the internal combustion engine The start request flag Fengst is changed from the reset state to the set state. Note that the start permission flag Fst is kept in the set state (start permission state).

  Since the winding temperature Tcoil of the rotating electrical machine 16 does not exceed the power save threshold temperature Tpsth at the time t1, the start controller 74 sets the cranking torque CRKtrq of the rotating electrical machine 16 to the maximum value MAX and rotates through the drive circuit 26. The electric machine 16 is rotationally driven to start the internal combustion engine 14 (from time t1 to time t2).

  In addition, EV driving | running | working is complete | finished at the time t1, and an engine driving | running | working period starts after the time t1.

  When the winding temperature Tcoil exceeds the power save threshold temperature Tpsth at time t3, the output limiter 70 sets the cranking torque CRKtrq threshold of the rotating electrical machine 16 to a power save value PS that is approximately half of the maximum value MAX. Set. With this setting, power (current) exceeding the power save value PS from the drive circuit 26 to the rotating electrical machine 16 is prohibited.

  However, the power save threshold temperature Tpsth is set to a threshold temperature at which the start of the internal combustion engine 14 (engine start) can be permitted only once, provided that the winding temperature Tcoil is equal to or lower than the start prohibition threshold temperature Tsubth. Yes.

  At time t4, the accelerator pedal 64 is switched to the brake pedal 66. That is, the accelerator pedal 64 is released and the accelerator pedal opening θap = 0 value is detected, and from the time t4 to the time t5 when the OFF state of the ignition switch 62 is detected by the ignition signal Sig = 0 (OFF). The electric machine 16 is driven in the regenerative state, and the power storage device 24 is charged through the drive circuit 26 under the control of the control device 30.

  As a result of the ignition switch 62 transitioning from the on state to the off state at time t5, the rotating electrical machine 16 is stopped and cooling in the soak state is started, so that the start controller 74 at time t5 The cranking torque CRKtrq is set to the “0 value” indicated torque, and the preset cooling guarantee preset time (preset value) Cpcold is set to the counter timer 76, and the counter timer 76 counts down (clocking, time reduction). To start.

  When the transition from the OFF state to the ON state of the ignition switch 62 is detected at time t6, the PS threshold value is changed to the maximum value MAX through the processing standby time until time t7, and from time t7 to time t7. The internal combustion engine 14 is started during t8 (Tcoil <Tsubth).

  Note that the winding temperature Tcoil has a large heat capacity of the winding + stator core, so-called thermal mass, and is almost lowered during the travel stop period of the vehicle 12 from the time t5 to the time t7 (the stopped state of the rotating electrical machine 16 and the internal combustion engine 14). Absent.

  Therefore, the start controller 74 detects that the winding temperature Tcoil increases again from the time t7 and exceeds the start prohibition threshold temperature Tsubth of the internal combustion engine 14 by the rotating electrical machine 16 before the time t8.

  At time t7, the start controller 74 resets the cooling guarantee preset time Ccold in the counter timer 76. However, since the internal combustion engine 14 is in operation, the downcounting (down timing) is not started.

  At time t9, the winding temperature Tcoil starts to decrease due to the traveling wind, but since it exceeds the start prohibition threshold temperature Tsubth, the start controller 74 permits start again at time t10 after the start processing is completed. The engine start permission flag Fst is reset (not permitted or prohibited).

  After the time point t11, the output limiter 70 enters the power saving state during traveling and decreases the torque limit range. Between time t11 and immediately before time t12, the rotating electrical machine 16 is driven as a generator by the internal combustion engine 14, and the generated power is charged into the power storage device 24 through the drive circuit 26, and the accelerator pedal 64 is immediately before the time t12. The brake pedal 66 is switched. The ignition switch 62 is turned off by the driver at time t12.

  When it is detected that the ignition switch 62 is turned off, at the time t12, the start controller 74 sets the cranking torque CRKtrq to the indicated torque of “0 value” and the cooling guarantee preset by the counter timer 76 A down-count from the time Cpcold is started.

  When the ignition switch 62 transitions from the off state to the on state at time t13, the start controller 74 prohibits the start of the internal combustion engine 14 until the winding temperature Tcoil falls below the start prohibition threshold temperature Tsubth at time t14. At t14, the start permission flag Fst is set, the prohibition is released, and the internal combustion engine 14 is started by the rotating electrical machine 16.

  At time t14, the countdown of the guaranteed cooling preset time Cpcold by the counter timer 76 has not been completed (finished), but since the winding temperature Tcoil has fallen below the start prohibition threshold temperature Tsubth, the internal combustion engine 14 is driven by the rotating electrical machine 16. The counter timer 76 resets the cooling guarantee preset time Cpcold.

  When a decrease in the winding temperature Tcoil is detected at time t16 and the starting process is completed at time t17, the start controller 74 that also functions as a start prohibitor sets the start permission flag Fst of the internal combustion engine 14 at time t17. After the reset time t18, the power saving state is set through the output limiter 70 and the start is prohibited (∵Tcoil> Tsubth).

  Thereafter, when the winding temperature Tcoil becomes lower than the start prohibition threshold temperature Tsubth at the time t19 during traveling by the internal combustion engine 14, the start controller 74 sets the start permission flag Fst.

  Further, at time t20, when winding temperature Tcoil falls below EV single travel permission threshold temperature Tevpth, start controller 74 resets internal combustion engine start request flag Fengst, and control device 30 causes vehicle with rotating electric machine 16 alone. 12 is permitted, and at time t21, the power saving by the output limiter 70 is canceled, and the control device 30 switches to EV traveling.

[Summary of operation when temperature sensor is normal]
As described above, according to the above-described embodiment, the internal combustion engine 14 stops (for example, time t5) in a state where the rotating electrical machine 16 is output-limited (power save, power limit), and thereafter, the internal combustion engine 14 Even when the engine is to be restarted (for example, at time t6), the temperature at which the internal combustion engine 14 is prohibited from starting so that the drive torque required for starting the internal combustion engine 14 can be output (second threshold temperature: start) The output is limited at a temperature (first threshold temperature) lower than the prohibition threshold temperature Tsubth, that is, the power save threshold temperature Tpsth (for example, time point t3).

  As a result, when the power saving threshold temperature Tpsth that is the first threshold temperature is exceeded, the rotating electrical machine 16 is output limited by the output limiter 70, and further exceeds the power saving threshold temperature Tpsth that is the first threshold temperature. It is suppressed that the temperature rises to the upper limit heat resistant temperature Tmax.

  Therefore, even when the winding temperature Tcoil or the like exceeds the power saving threshold temperature Tpsth that is the first threshold temperature during operation, it is maximum that the winding prohibition threshold temperature Tsubth that is the second threshold temperature is exceeded. For example, when the internal combustion engine 14 is stopped in a state where the power saving threshold temperature Tpsth that is the first threshold temperature is exceeded (for example, time t5 and time t12) and then the internal combustion engine 14 is to be started (for example, Also, at time t6 and time t13), the internal combustion engine 14 can be started by the rotating electrical machine 16 (time t7 corresponding to time t6, time t14 corresponding to time t13).

  As described above, according to the embodiment described above, the winding temperature Tcoil that is the temperature of the rotating electrical machine 16 or the switching element temperature Tsw that is the temperature of the drive circuit 26 of the rotating electrical machine 16 and the capacitor temperature Tc are the first threshold value during operation. Even when the output limiter 70 exceeds the power save threshold temperature Tpsth, which is a temperature, the internal combustion engine 14 can be started once by the rotating electrical machine 16, while the winding temperature Tcoil or the switching element It is possible to reliably prevent the temperature Tsw and the capacitor temperature Tc from reaching the upper limit heat resistance temperature Tmax.

  More specifically, according to the above-described embodiment, the internal combustion engine 14 of the vehicle 12 is in the on-state of the ignition switch 62 when the ignition switch 62 transitions from the off-state to the on-state (time t6, time t13). At the time of system request (time t1, time t7, time t14), the control is started by the rotating electrical machine 16 in principle.

  The winding temperature sensor 51 detects the temperature of the rotating electrical machine 16 (winding temperature Tcoil).

  The switching element temperature sensor 52 and the capacitor temperature sensor 53 detect the temperatures Tsw and Tc of the drive circuit 26 of the rotating electrical machine 16.

  The output limiter 70 rotates when the detected temperature (winding temperature Tcoil) detected by the temperature sensor (winding temperature sensor 51 in the above embodiment) exceeds the first threshold temperature (power saving threshold temperature Tpsth). The output of the electric machine 16 is limited (power save) (time t3, time t10, time t17).

  Even if the starting controller (starting prohibitor) 74 limits the output of the rotating electrical machine 16, the detected temperature (winding temperature Tcoil) is higher than the first threshold temperature (power save threshold temperature Tpsth). When the temperature (start prohibition threshold temperature Tsubth) is exceeded, the start of the internal combustion engine 14 by the rotating electrical machine 16 is prohibited as an exception control (from time t13 to time t14).

  According to this embodiment, the detected temperature (winding temperature Tcoil) of the rotating electrical machine 16 capable of starting the internal combustion engine 14 or the detected temperature (capacitor temperature Tc, switching element temperature Tsw) of the drive circuit 26 of the rotating electrical machine 16 is the first. By limiting the output of the rotating electrical machine 16 when one threshold temperature (power save threshold temperature Tpsth) is exceeded (Tcoil> Tpsth), the detected temperature (winding temperature Tcoil) is basically set to the first threshold temperature. Control is performed so as not to exceed a second threshold temperature (start prohibition threshold temperature Tsubth) higher than (power save threshold temperature Tpsth), and in principle, the internal combustion engine 14 is allowed to start by the rotating electrical machine 16 by control (time t7).

  In this case, the second threshold temperature (starting prohibition threshold temperature Tsubth) is higher than the first threshold temperature (power saving threshold temperature Tpsth) when the detected temperature (winding temperature Tcoil) is higher than the first threshold temperature (starting prohibition threshold temperature Tsubth). ), Even if the internal combustion engine 14 is started once (at time t7 to time t9), the detected temperature (winding temperature Tcoil) is the upper limit heat resistance temperature (winding) of the rotating electrical machine 16 or the drive circuit 26. The upper limit heat resistance temperature Tmax of the line temperature Tcoil is not set.

  According to this embodiment, the detected temperature (winding temperature Tcoil) detected by the temperature sensor (winding temperature sensor 51) exceeds the first threshold temperature (power save threshold temperature Tpsth), and the output of the rotating electrical machine 16 is limited. In a state where the detected temperature (winding temperature Tcoil) is higher than the first threshold temperature (power save threshold temperature Tpsth) but lower than the second threshold temperature (starting prohibition threshold temperature Tsubth), The engine 14 can be started once (time t7). Therefore, while the internal combustion engine 14 can be started by the rotating electrical machine 16, the detected temperature (winding temperature Tcoil) reaches the upper limit heat resistant temperature of the rotating electrical machine 16 or the drive circuit 26 (upper heat resistant temperature Tmax of the winding temperature Tcoil). It can be controlled so that there is no.

  The winding temperature Tcoil detected by the winding temperature sensor 51 has a characteristic that the winding wound around the teeth of the rotating electrical machine 16, that is, the stator has a large thermal mass and the temperature is difficult to decrease after power saving. Therefore, a power saving amount and a cooling guarantee preset time (preset value) Cpcold corresponding to this characteristic are set for the winding temperature Tcoil.

  The first threshold temperature, the second threshold temperature, the starting prohibition threshold temperature, the upper limit heat-resistant threshold temperature, the power saving amount, and the cooling guarantee preset are also appropriate for the switching element temperature Tsw and the capacitor temperature Tc. Time (preset value) Cpcold is preset. In this case, the power saving amount of the switching element and the power saving amount of the capacitor are smaller than the power saving amount of the winding. For example, the power saving amount of the winding is limited to several tens [Nm], and the switching element and the capacitor are limited to about half the value. Note that the cooling guaranteed preset time (preset value) Cpcold needs to be set to a value corresponding to a time in which the capacitor has a large thermal mass and is long like the winding, but since the switching element has a small thermal mass, the cooling guaranteed preset time ( The preset value) Cpcold may be set to an extremely short time.

[Operation when temperature sensor is abnormal]
Next, the start control operation of the internal combustion engine 14 of the vehicle 12 according to this embodiment when the temperature sensor is abnormal (detection value is fixed) will be described with reference to the time chart of FIG.

  Between time t30 and time t31, the temperature sensor is normal and the detected temperature (winding temperature Tcoil) is a low temperature that does not exceed the power save threshold temperature Tpsth that is the first threshold temperature. EV traveling period.

  When a change in the vehicle state is detected by the control device 30 at time t31, the start controller 74 sets the internal combustion engine start request flag Fengst at the time t31 and maximizes the cranking torque CRKtrq of the rotating electrical machine 16. The rotary electric machine 16 is rotationally driven with the value MAX set, and the internal combustion engine 14 is started (from time t31 to time t32).

  After the time point t31, the engine running period starts. In the vicinity of the time point t31, an abnormality of at least one of the temperature sensors 51, 52, 53 is detected by the control device 30.

  Since an abnormality of the temperature sensor is detected, the start controller 74 resets the start permission flag Fst and puts it into the power saving state through the output limiter 70 at time t32 after one start process.

  At time t32, the accelerator pedal 64 is switched to the brake pedal 66, and at time t33 when the ignition switch 62 is turned off, the rotating electrical machine 16 is stopped and cooling in the soak state is started.

  At that time t33, the start controller 74 stops the driving of the rotating electrical machine 16 by the drive circuit 26 so that the driving torque of the rotating electrical machine 16 becomes “0”, and a predetermined cooling guarantee preset time Cpcold. Is set in the counter timer 76, and the counter timer 76 starts down-counting (time counting, time reduction).

  The down-counting continues even when the ignition switch 62 is off from time t33 to time t34.

  At time t34, the ignition switch 62 transitions from the off state to the on state. In this case, the start controller 74 considers that the temperature is in a high temperature state because the count by the counter timer 76 is not completed, and prohibits the start of the internal combustion engine 14 (does not allow start).

At time t34, the control device 30 displays on the display device in the notification device 28 that the temperature of the traveling motor is high and start is not permitted. At the same time, it is displayed that it is recommended that the ignition switch 62 is once turned off and then turned on again after a while. The notification device 28 may output the sound by a speaker.

  When the timing ends at time t35, the start controller 74 sets the start permission flag Fst.

  Although the ignition switch 62 is on at time t35, the start controller 74 does not start the internal combustion engine 14.

  When the ignition switch 62 is turned off by the driver at time t36, and when a transition from the off state to the on state is made at time t37, the start controller 74 detects the transition.

  At this time, the start controller 74 outputs a start instruction because the start permission flag Fst is set. As a result, the power save (torque limit) is released through the output limiter 70.

  At time t38, the start controller 74 sets the cranking torque CRKtrq of the rotating electrical machine 16 to the maximum value MAX through the drive circuit 26 and rotationally drives the rotating electrical machine 16 to start the internal combustion engine 14 (from time t38 to time t39). ).

  After time t39, the rotating electrical machine 16 is driven as a generator by the internal combustion engine 14.

  Since the temperature sensor is detected to be abnormal after time t40, the power save state is not canceled.

[Summary of operation when temperature sensor is abnormal]
When it is detected that at least one of the winding temperature sensor 51, the switching element temperature sensor 52, and the capacitor temperature sensor 53 has failed (time t31), the driving torque (or output) of the rotating electrical machine 16 is detected. Is zero (time point t33, time point t40) until the detected temperature falls to a temperature at which the internal combustion engine 14 can be started (the preset cooling guarantee preset time Cpcold is set in the failed temperature sensor). After the elapse of the longest time, the start of the internal combustion engine 14 by the rotating electrical machine 16 is permitted (time point t35).

  According to this embodiment, even when the temperature sensor fails, the internal combustion engine 14 can be started by the rotating electrical machine 16 while the winding temperature Tcoil of the rotating electrical machine 16 or the switching of the drive circuit 26 of the rotating electrical machine 16 is switched. It is possible to prevent the element temperature Tsw or the capacitor temperature Tc from reaching the upper limit heat-resistant temperature Tmax defined for each.

  Note that the present invention is not limited to the above-described embodiment. For example, the present invention is directed to the temperature of the field magnet of the rotating electrical machine 16 (including the estimated temperature). Of course, the configuration can be adopted.

DESCRIPTION OF SYMBOLS 12 ... Vehicle 14 ... Internal combustion engine 16 ... Rotating electrical machine 18 ... Drive shaft 24 ... Power storage device 26 ... Drive circuit 30 ... Control device 51 ... Winding temperature sensor 62 ... Ignition switch 70 ... Output limiter 74 ... Start controller 76 ... Counter Timer

Claims (3)

A vehicle comprising an internal combustion engine and a rotating electrical machine capable of driving the vehicle, wherein the internal combustion engine is started by the rotating electrical machine in response to a start request of the internal combustion engine,
A temperature sensor for detecting a temperature of the rotating electrical machine or a temperature of a driving circuit of the rotating electrical machine;
A start controller for starting the internal combustion engine by the rotating electrical machine when the detected temperature detected by the temperature sensor exceeds a single travel permission threshold temperature for permitting independent traveling by the rotating electrical machine;
After the start of the internal combustion engine by the rotating electrical machine, when the detected temperature detected by the temperature sensor exceeds a first threshold temperature higher than the single travel permission threshold temperature, an output restriction that limits the output of the rotating electrical machine And
Even if the output of the rotating electrical machine is limited, if the detected temperature exceeds the second threshold temperature higher than the first threshold temperature, the starting prohibition for prohibiting the starting of the internal combustion engine by the rotating electrical machine is prohibited. And
A vehicle comprising: The vehicle according to claim 1,
The second threshold temperature is
In the temperature range where the detected temperature is higher than the first threshold temperature but lower than the second threshold temperature, even if the internal combustion engine is started once, the detected temperature is the rotating electric machine or the drive. A vehicle characterized by being set so as not to reach the upper temperature limit of the circuit. In the vehicle according to claim 1 or 2,
When the temperature sensor fails,
When the driving torque of the rotating electrical machine becomes zero, start counting the predetermined time, and when the counting of the predetermined time is finished, permit the start of the internal combustion engine by the rotating electrical machine,
The vehicle according to claim 1, wherein the predetermined time is a preset time required for the rotating electrical machine to fall to a temperature at which the internal combustion engine can be started.

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