JP5816957B2 - Vehicle control device - Google Patents

Description

  The present invention relates to a control device for a vehicle equipped with an engine and a motor / generator. In particular, the present invention relates to a technique for suppressing a vehicle shock that occurs immediately after a transition from a regenerative operation to a power running operation.

  2. Description of the Related Art In recent years, hybrid vehicles that have improved fuel efficiency by providing an engine and a motor / generator as driving sources for travel have become widespread. An example of such a hybrid vehicle control device is disclosed in Patent Document 1. The control device for a hybrid vehicle disclosed in this document corrects the inertia torque of the motor / generator and reduces the shock at the moment of switching the gear immediately after the engine is started. The change in the rotational speed is suppressed to reduce the shock.

Japanese Patent No. 4326925

  By the way, in general, when the hybrid vehicle decelerates in the accelerator off state, the engine and the motor / generator are driven from the wheel side, but at this time, by causing the motor / generator to function as a generator, A regenerative operation is performed to charge the battery. In order to increase the regeneration efficiency, it is desirable to make the action of the engine brake as small as possible. For this purpose, it is desirable to stop the fuel supply to the engine during regeneration and to increase the opening of the throttle valve as much as possible.

  FIG. 5 is a time chart showing an example of the accelerator ON / OFF state, the motor regeneration ON / OFF state, the throttle valve opening, the engine torque, the vehicle acceleration, and the like when such a regenerative operation is executed. It is a chart. In this time chart, the accelerator is turned ON from the accelerator ON at time t0, and the state is changed from the power running state (motor regeneration OFF) to the regeneration state (motor regeneration ON). In this regenerative state, the engine and motor / generator are driven and the vehicle is decelerating (the vehicle acceleration is negative). During this time, in order to increase the regenerative efficiency of the motor / generator The throttle valve opening is increased, and the engine torque is controlled so that the magnitude of the engine torque (engine brake action) decreases.

  At time t1, the accelerator is turned off and the accelerator is turned on, and the state is changed from the regenerative state (motor regeneration ON) to the power running state (motor regeneration OFF). Simultaneously with the transition to the power running state, after the throttle valve opening is once closed to near full close, throttle control is performed according to the accelerator depression amount. For this reason, excessive engine torque is temporarily generated at time t2 immediately after the transition to power running, which may shock the vehicle and cause discomfort to the occupant.

  The control device for a hybrid vehicle disclosed in Patent Document 1 corrects the inertia torque of the motor / generator in order to reduce the shock at the moment of switching the gear immediately after the engine is started. It does not focus on the sudden increase in engine torque immediately after fully opening and then shifting to power running. In addition, the hybrid vehicle control device disclosed in the same document corrects the torque of the motor / generator according to the difference between the rotational speed of the engine and the rotational speed of the motor / generator, thereby switching the gear immediately after starting the engine. Although the shock is reduced, the magnitude of the shock is not predicted in advance, and therefore the timing of shock suppression may be delayed.

  The present invention has been made in view of such a problem. In a vehicle in which a motor / generator is regenerated by stopping fuel supply to an engine and opening a throttle valve during vehicle deceleration, the present invention shifts from regeneration to power running. It is an object of the present invention to provide a vehicle control device that can suppress a shock generated in a vehicle due to a temporary excessive torque of an engine generated immediately after the operation.

  In order to achieve the above object, a vehicle control apparatus according to the present invention, in a vehicle equipped with an engine and a motor / generator, stops fuel supply to the engine when the vehicle decelerates, and increases the throttle valve opening of the engine. Assuming that the motor / generator performs a regenerative operation, the power running is based on the engine speed immediately before the end of the regenerative operation and the opening of the throttle valve of the engine immediately before the end of the regenerative operation. Estimating means for estimating regenerative torque that is generated immediately after the transition and that is in proportion to the excessively large engine torque, and generating regenerative torque estimated by the estimating means when the predetermined time has elapsed after the power running transition. And regenerative control means.

  According to the vehicle control apparatus having such a configuration, the regenerative torque that is temporarily balanced immediately after the power running shift is balanced with the excessively large engine torque, and after the power running transition, the regenerative torque is Since the generator is generated, the excessive engine torque generated immediately after the shift to power running cancels out the regenerative torque, thereby suppressing the shock generated in the vehicle.

  According to the present invention, in a vehicle in which the motor / generator is regeneratively operated by stopping the fuel supply to the engine and opening the throttle valve when the vehicle decelerates, the engine temporarily generates excessive torque immediately after the power running shift. As a result, the shock generated in the vehicle is eliminated or suppressed. Further, since the regenerative torque is estimated before excessive torque is temporarily generated in the engine, a shock generated in the vehicle can be eliminated or suppressed without a time lag.

It is a figure which shows the system configuration | structure in the hybrid vehicle to which the control apparatus of the vehicle which concerns on embodiment of this invention is applied. 4 is a time chart showing changes in various numerical values when shifting from a regenerative state to a power running state in the vehicle control device according to the embodiment of the present invention. It is the flowchart which showed the specific example of the procedure of the processing operation which the control apparatus of the vehicle which concerns on embodiment of this invention performs. It is an example of a map in which the relationship between the engine speed Ne1 immediately before the end of the regenerative operation, the opening degree θ of the electronically controlled throttle valve immediately before the end of the regenerative operation, and the regenerative torque Tm necessary to cancel the shock is set. It is the time chart which showed the change of the various numerical values in the case of transfering from a regeneration state to a power running state in the control apparatus of the vehicle which concerns on a prior art example.

  Hereinafter, a vehicle control device according to an embodiment of the present invention will be described. In this embodiment, a hybrid vehicle control device will be described as an example.

  As shown in FIG. 1, the hybrid vehicle 100 according to the present embodiment includes an engine 1 and a motor / generator 2 as a driving source for traveling. The driving force of the engine 1 is transmitted to the drive wheels 6 through the clutch 3, the transmission 4, the drive shaft 5, and the like. The driving force of the motor / generator 2 is transmitted to the drive wheels 6 through a power transmission mechanism 7 including a speed reducer and the drive shaft 5. The operation of the engine 1 is controlled by the central control device 8, and the power running and regenerative operation of the motor / generator 2 are controlled by the motor control device 9. Reference numeral 10 denotes a motor battery as a power source for the motor generator 2.

  The engine 1 is, for example, a gasoline engine or a diesel engine, and includes an electronically controlled throttle valve 11 in its intake system.

  The motor / generator 2 functions as a driving source for traveling, and also functions as a generator in a regenerative state driven by the engine 1, driving wheels 6, and the like.

  The motor control device 9 controls electric power supplied to the motor / generator 2 so that the motor / generator 2 outputs a driving force necessary for traveling of the vehicle. The motor control device 9 charges the motor battery 10 with electric power output from the motor / generator 2 that performs a regenerative operation when the vehicle is traveling at a reduced speed. Such a motor control device 9 includes, for example, an inverter or a DC-DC converter.

  The central control unit 8 is mainly configured by a microcomputer including a central processing unit, a memory, an input / output interface, and the like. The input interface of the central control device 8 is output from the accelerator operation amount information a output from the accelerator operation amount detection sensor 21, the engine speed information b output from the engine speed sensor 22, and the throttle opening sensor 16. The throttle opening information c of the electronically controlled throttle valve 11 and the charge amount information e output from the charge amount detection sensor 17 for detecting the charge amount E of the motor battery 10 are input. On the other hand, from the output interface of the central control device 8, the valve opening command information g for the electronic control throttle 11, the reduction ratio command information h for the transmission 4, and the command information i for the motor control device 9 are output.

  FIG. 2 shows an accelerator ON / OFF state, a motor regeneration (regeneration operation) ON / OFF state, a valve opening degree of the electronic control throttle valve 11 when the hybrid vehicle 100 shifts from the regenerative state to the power running state, 3 is a time chart showing engine torque, vehicle acceleration, and the like. In this time chart, the accelerator is turned on from the accelerator ON at time t0, and the central controller 8 that detects this changes the motor control to shift from the power running state (motor regeneration OFF) to the regeneration state (motor regeneration ON). A regeneration command i is transmitted to the device 7. Further, the central control unit 8 stops the fuel supply to the engine 1 and transmits the valve opening command information g to the electronic control throttle valve 11 to increase the efficiency of the regenerative operation (energy recovery), thereby opening the valve. Make the degree larger than when it is not regenerated (for example, fully open).

  Thereafter, when the accelerator is turned off and the accelerator is turned on at time t1, the central control device 8 estimates a regenerative torque Tm that is balanced with a temporarily excessive engine torque generated immediately after the transition from power regeneration to power running.

  Here, the regenerative torque Tm is estimated based on the engine speed Ne1 immediately before the end of the regenerative operation, the opening degree θ of the electronically controlled throttle valve 11 immediately before the end of the regenerative action, the engine speed Ne1, the valve opening degree θ, and the regenerative torque. This is performed based on the map as shown in FIG. 4 in which the correspondence relationship of Tm is set. In the map shown in the figure, the horizontal axis indicates the engine speed Ne1 immediately before the end of the regenerative operation, and the vertical axis indicates the estimated regenerative torque Tm. Each opening degree of the electronically controlled throttle valve 11 immediately before the end of the regenerative operation is shown. The relationship between the engine speed Ne1 and the regenerative torque is shown for each of θ1 to θ3. That is, the central controller 8 estimates the value obtained by applying the map to the engine speed Ne1 immediately before the end of the regenerative operation and the opening degree θ of the electronic control throttle valve 11 immediately before the end of the regenerative operation. Read as Tm.

  It should be noted that the relationship between various parameters set in the map can be obtained by simulation, experiment, or the like. In the map, only three types of opening degrees θ of the electronic control throttle valve 11 immediately before the end of the regenerative operation are shown, but the number of opening degrees θ may be more or less than three types. Further, in the above map, the engine speed Ne1 and the regenerative torque Tm have a linear relationship with respect to each valve opening degree θ1 to θ3, but the relationship when actually obtained by simulation, experiment, etc. is linear. Not necessarily a relationship. However, the higher the engine speed Ne1 immediately before the end of the regenerative operation, the greater the regenerative torque Tm. The greater the opening degree θ of the electronic control throttle valve 11 immediately before the end of the regenerative operation, the greater the regenerative torque Tm. There is no change.

  The central control device 8 causes the motor / generator 2 to generate the regenerative torque Tm estimated at the elapse of the predetermined time T (time t3) after the shift to power running for a predetermined short time T1. Then, before and after time t2, the temporarily excessive torque of the generated engine and the generated regenerative torque Tm cancel each other upstream of the drive shaft 5. As a result, the shock generated in the vehicle due to the temporarily excessive torque of the engine is eliminated or suppressed. The predetermined time T is preferably a time until the engine torque temporarily becomes excessive after the power running shift, and the predetermined time T can be determined from experience values, experiments, simulations, and the like.

  Hereinafter, a specific example of the procedure for executing the above control will be described based on the flowchart shown in FIG.

  In step ST1, the central controller 8 determines whether or not the regenerative state has shifted to the power running state. If an affirmative determination is made here, the electronically controlled throttle control in the normal power running state is started (step ST2), and immediately after the transition to the power running state, the engine torque that is temporarily excessively large immediately after the transition to the power running state is set. A balanced regenerative torque Tm is estimated (step ST3). As described above, the regenerative torque Tm is calculated based on the above-described map (see FIG. 4) from the engine speed Ne1 immediately before the end of the regenerative operation and the opening degree θ of the electronic control throttle valve 11 immediately before the end of the regenerative operation. Required by reference.

  In step ST4, the central controller 8 determines whether or not the estimated value Tm of the regenerative torque exceeds a predetermined threshold value. Here, if an affirmative determination is made, then it is assumed that excessive engine torque is temporarily generated, and the process proceeds to step ST5. On the other hand, if a negative determination is made, then it is assumed that excessive engine torque is not temporarily generated, and the process proceeds to step ST7.

  In step ST5, the central control device 8 determines whether or not a predetermined time T has elapsed after shifting to power running. If the determination is affirmative, the process proceeds to step ST6. If the determination is negative, this determination is repeated.

  In step ST6, the central controller 8 causes the motor / generator 2 to generate the regenerative torque Tm estimated in ST3 for a predetermined short time T1 via the motor controller 9. Thus, the engine torque temporarily generated before and after the time t2 and the regenerative torque Tm generated only for the predetermined short time T1 cancel each other on the upstream side (driving force source side) from the drive shaft 5, and the shock generated in the vehicle Is eliminated or suppressed.

  In step ST <b> 7, the central controller 8 performs normal motor assist control (power running control) via the motor controller 9.

  On the other hand, after making a negative determination in step ST1, the central control device 8 fully opens the electronic control throttle valve 11 (step ST8), stops the fuel supply to the engine 1, and regenerates the motor control device 9. (Step ST9). If the electronically controlled throttle valve 11 is already fully opened, the fuel supply to the engine 1 is stopped, and the regenerative operation is being performed, these states and operations are continued until the power running state is shifted.

  As is apparent from the above description, the hybrid vehicle control apparatus according to the embodiment of the present invention estimates the regenerative torque Tm that balances the temporarily excessive torque of the engine generated immediately after the transition from regenerative to power running. The motor / generator 2 generates the regenerative torque Tm when a predetermined time T has elapsed after shifting to power running. As a result, excessive engine torque that is temporarily generated immediately after the transition to power running can be canceled by the regenerative torque Tm on the drive source side with respect to the drive wheels, and a shock that occurs in the vehicle is eliminated or suppressed. Further, since the estimated value Tm of the regenerative torque is obtained before excessive engine torque is temporarily generated, a shock generated in the vehicle can be eliminated or suppressed without time lag.

  The present invention is applicable to, for example, a control device for a hybrid vehicle equipped with an engine and a motor / generator.

DESCRIPTION OF SYMBOLS 1 Engine 2 Motor generator 8 Central controller 9 Motor controller 11 Electronically controlled throttle valve 16 Throttle opening sensor 21 Accelerator operation amount detection sensor 22 Engine speed sensor 100 Hybrid vehicle (vehicle)
b Engine speed information c Throttle opening information g Valve opening command information i Command information for motor controller

Claims (1)

In a vehicle equipped with an engine and a motor / generator, a vehicle control device for stopping the fuel supply to the engine when the vehicle decelerates and increasing the opening of a throttle valve of the engine to cause the motor / generator to perform a regenerative operation In
Based on the engine speed just before the end of the regenerative operation and the opening of the throttle valve of the engine just before the end of the regenerative operation, the regenerative torque that balances the temporarily excessively large engine torque generated immediately after the power running transition Estimating means for estimating
Regenerative control means for causing the motor / generator to generate regenerative torque estimated by the estimating means after a predetermined time has elapsed after the power running transition;
A vehicle control apparatus comprising: