JP5054719B2 - Generator control device - Google Patents

Description

  The present invention relates to a generator control device that performs a power generation operation by a driving power of a turbine driven by exhaust gas energy of an internal combustion engine.

  2. Description of the Related Art Conventionally, there has been proposed a turbine generator that generates power by using a surplus of exhaust gas energy of an internal combustion engine to drive a turbine and driving a generator provided on a turbine shaft shaft by the driving force of the turbine. .

  When the internal combustion engine is at medium to high speed, the exhaust gas energy increases, so the turbine speed is high. Further, when the internal combustion engine is at a low speed, the exhaust gas energy becomes small, so that the turbine speed is low. Since the turbine generator is provided on the turbine shaft, the amount of power that can be generated by the turbine generator varies depending on the state of the internal combustion engine.

  Conventionally, in this type of turbine generator, the engine brake position and the transmission gear position are detected, and the amount of power generated by the motor generator is controlled according to the detected position, and the load is applied to the exhaust energy by the power generation operation. The exhaust brake of the vehicle is actuated over time (see, for example, Patent Document 1).

JP-A-62-26334

  However, in the case of the configuration in which the power generation amount is changed according to the engine brake position as in the device disclosed in Patent Document 1, the power generation load torque changes with the required change in the power generation amount, and the change in the power generation load torque is the same. The running torque of the vehicle also changes, and as a result, there is a problem that the driving comfort of the driver is lowered.

  The present invention has been made to solve the above-mentioned problems in the conventional apparatus, and the target power generation amount is set so that power generation is performed at the time of deceleration with relatively little influence on the running comfort of the vehicle. It aims at providing the control apparatus of the generator which does not impair a driving | running | working comfort of a driver | operator by controlling.

The generator control device according to the present invention comprises:
A generator control device provided in an exhaust passage of an internal combustion engine for driving a vehicle and capable of generating electric power via a turbine driven by exhaust gas energy of the internal combustion engine ,
Based on the amount of the exhaust gas energy determined according to at least one of the detected vehicle speed and the rotational speed of the internal combustion engine and at least one of the detected throttle position and accelerator position. The generator control device is characterized in that a target power generation amount of the generator is calculated and the power generation amount of the generator is controlled based on the calculated target power generation amount.

The generator control device according to the present invention preferably generates power from the generator based on at least one of the speed of the vehicle and the rotational speed of the internal combustion engine and at least one of the throttle position and the accelerator position. A power generation amount map having a power generation amount, and corresponding to at least one of the detected vehicle speed and the rotational speed of the internal combustion engine and at least one of the detected throttle position and accelerator position Is derived from the power generation amount map, and the target power generation amount of the generator is calculated based on the power generation amount derived from the power generation amount map.

  The generator control device according to the present invention preferably includes an acceleration correction map in which a first power generation amount correction coefficient is set based on the longitudinal acceleration of the vehicle, and an acceleration correction coefficient corresponding to the detected longitudinal acceleration of the vehicle. Is derived from the acceleration correction map, and the power generation amount derived from the power generation amount map is corrected by the acceleration correction coefficient derived from the acceleration correction map.

  Furthermore, the generator control device according to the present invention preferably includes a battery charged by the generator, and a charge state correction map in which a charge state correction coefficient is set based on the charge state of the battery, and is detected. A charge state correction coefficient corresponding to the state of charge of the battery is derived from the charge state correction map, and the power generation amount derived from the power generation amount map is derived from the charge state correction coefficient derived from the charge state correction map. Configured to correct.

  The generator control device according to the present invention preferably includes a brake correction map in which a correction coefficient is set based on a brake position, and the brake correction coefficient corresponding to the detected brake position is derived from the brake correction map. The power generation amount derived from the power generation amount map is corrected by the brake correction coefficient derived from the brake correction map.

According to the control apparatus of the generator according to the invention, at least one of a rotational speed of the detected vehicle speed and the engine is determined according to at least one of the detected throttle position and accelerator position The target power generation amount of the generator is calculated based on the amount of exhaust gas energy to be generated, and the power generation amount of the generator is controlled based on the calculated target power generation amount. There is an effect that power generation can be performed without damage.

It is a block diagram which shows the whole structure of the turbine generator which concerns on Embodiment 1 of this invention. It is a block diagram which shows operation | movement of the generator control apparatus of the turbine generator which concerns on Embodiment 1 of this invention. It is a graph which shows the detail of the electric power generation amount map of the turbine generator which concerns on Embodiment 1 of this invention. It is a flowchart which shows operation | movement of the generator control apparatus of the turbine generator which concerns on Embodiment 1 of this invention.

Embodiment 1 FIG.
1 is a schematic configuration diagram showing a system configuration of a turbine generator control apparatus according to Embodiment 1 of the present invention. In FIG. 1, an internal combustion engine (hereinafter sometimes referred to as “engine”) 1 is an example of a 4-cylinder gasoline engine. Even an engine is applicable. The combustion system of the engine 1 can be applied not only to a direct injection engine that directly injects fuel into the cylinder, but also to a port injection engine that injects fuel into the intake manifold 2 after the throttle valve 4. It is.

  In the internal combustion engine 1, first, dust and dust are removed from the intake air taken in from the atmosphere by the air cleaner 7. The intake air that has passed through the air cleaner 7 is sent to the intake manifold 2 of the internal combustion engine 1, and its inflow capacity is adjusted according to the opening of the throttle valve 4 in the middle.

The mixture of air and fuel sucked into the internal combustion engine 1 through the intake manifold 2 is ignited in the combustion chamber of the internal combustion engine 1, and the combustion energy generated after the ignition of the mixture is the driving force of the vehicle. It is used as a driving force.

  The exhaust gas after the combustion of the air-fuel mixture in the internal combustion engine 1 is exhausted through the exhaust manifold 3. The turbine 6 is rotationally driven using the energy (kinetic energy, pressure) of the exhaust gas.

  A rotor of the turbine generator 5 is fixed on the same axis of the turbine 6. Further, a generator control device 9 is connected to the turbine generator 5, and the turbine generator 5 is controlled by the generator control device 9 to convert the driving force of the turbine 6 into electric energy to generate power. Further, a lithium ion battery (hereinafter referred to as Li ion battery) 11 is connected to the generator control device 9, and the Li ion battery 11 is charged with electric energy obtained by the power generation of the turbine generator 5.

  Next, the generator control device 9 will be described. The generator control device 9 includes a vehicle speed sensor 12 for detecting the vehicle speed (hereinafter referred to as a vehicle speed), a throttle position sensor 8 for detecting the throttle position, and a vehicle longitudinal acceleration sensor 13 for detecting the longitudinal acceleration of the vehicle. And a Li-ion battery state detection sensor 14 for detecting the state of charge of the Li-ion battery 11 is connected. The generator control device 9 determines the power generation amount of the turbine generator 5 based on the signals from the aforementioned sensors, and controls the power generation amount by the turbine generator 5.

  FIG. 2 is a block diagram showing the operation of the generator control device 9 for a turbine generator according to Embodiment 1 of the present invention. In addition, the numerical value used for the following description shows an example, is not restrict | limited to this, The numerical value can be suitably set with a vehicle.

  In FIG. 1 and FIG. 2, first, the turbine generator 5 outputs the power generation amount map 22 based on the vehicle speed detection value 20 given from the vehicle speed sensor 12 and the throttle position detection value 21 given from the throttle position sensor 8. Refer to the amount of power to be generated. FIG. 3 is a graph showing details of the power generation amount map of the turbine generator according to Embodiment 1 of the present invention, where the vertical axis indicates the power generation amount and the horizontal axis indicates the throttle position.

  For example, when the vehicle speed detection value is as large as 120 [km / h], the air resistance to the vehicle increases, and when power generation using exhaust gas energy is performed, the power generation load torque increases and the feeling of deceleration becomes too large. In other words, the driving comfort of the driver is impaired. Further, for example, when the vehicle speed detection value is as small as 10 [km / h], there is a possibility of engine stall, so that the power generation by the exhaust gas energy is impossible. In consideration of such characteristics, as shown in FIG. 3, the power generation amount map 22 sets the characteristic curve of the power generation amount with respect to the throttle position so as to differ depending on the detected vehicle speed. The power generation amount map 22 is prepared in advance according to the vehicle.

Next, based on the vehicle longitudinal acceleration detection value 23 from the vehicle longitudinal acceleration sensor 13 with respect to the power generation amount 221 based on the power generation amount map 22 referred to based on the vehicle speed detection value 20 and the throttle position detection value 21. Based on an acceleration correction coefficient 241 obtained from an acceleration correction map 22, which will be described later, and a detection value 25 of a state of charge (hereinafter referred to as SOC) of the lithium ion battery from the Li ion battery state detection sensor 14, an SOC described later. The SOC correction coefficient 261 derived from the correction map 26 is multiplied by a multiplier 27 to determine a target power generation amount 28.

  When the longitudinal acceleration 23 of the vehicle is large, that is, when power generation is performed during acceleration, the power generation load torque increases due to power generation and the acceleration force decreases. For these reasons, when taking into account the driving comfort of the driver, power generation during deceleration is preferable. In consideration of this characteristic, an acceleration correction coefficient 241 corresponding to the longitudinal acceleration detection value 23 is extracted from the acceleration correction map 24 stored in advance in the generator control device 9, and this acceleration correction coefficient 241 is obtained by the multiplier 27. The power generation amount 221 is corrected by multiplying the power generation amount 221 by the power generation amount map 22.

  The acceleration correction map 24 is a map prepared according to the vehicle in advance with the horizontal axis representing acceleration and the vertical axis representing a coefficient, and “2” to “0” acceleration correction coefficient 241 is set corresponding to the longitudinal acceleration detection value 23. is doing.

  In order to prevent overcharging of the Li-ion battery, an SOC correction coefficient 261 corresponding to the detected SOC detection value 25 is derived from the SOC correction map 26, and this SOC correction coefficient 261 is generated by the multiplier 27 using the power generation amount 221. Multiply by. The SOC correction map 26 is a map prepared according to the vehicle in advance with the vertical axis representing the SOC and the horizontal axis representing the power generation amount coefficient. The SOC correction map corresponds to the SOC detection value 25 from 0 [%] to 100 [%]. A coefficient 261 is set.

  The SOC detection value 25 of the Li ion battery can be obtained by detecting the state of charge by a general method obtained from the current / voltage and the like. In the present invention, various known methods for detecting the state of charge of the Li ion battery can be applied.

  Next, as described above, a generator for generating the target power generation amount 28 from the target power generation amount 28 obtained by multiplying the power generation amount 221 by the acceleration correction coefficient 241 and the SOC correction coefficient 261 by the multiplier 27 as described above. The field current i is calculated by the field current value calculator 29, and the calculated field current i is output from the field current output means 30. The generator 5 generates a power generation amount based on the field current i output from the field current output means 30 and the rotational speed of the engine 1, and charges the Li ion battery 11.

  In recent years, there are vehicles without a throttle. For such a vehicle, the accelerator position is detected by using an accelerator position sensor instead of the throttle position sensor 8, and an acceleration correction map in which an acceleration correction coefficient is set corresponding to the accelerator position is used. It is possible to obtain the same effect as when

  FIG. 4 is a flowchart showing the operation of the generator control device for the turbine generator according to Embodiment 1 of the present invention. Next, the flow of the control operation in the generator control device 9 will be described using this flowchart. In FIG. 4, first, in step S201, a vehicle speed detection value 20 from the vehicle speed sensor 12 and a throttle position detection value 21 from the throttle position sensor 8 are detected, and the process proceeds to step S202.

  In step S202, referring to the power generation amount map 22 stored in advance in the generator control device 10, the power generation amount 221 corresponding to the vehicle speed detection value 20 and the throttle position detection value 21 obtained in step S201 is extracted, and the next step The process proceeds to S214. As described above, the power generation amount set in the power generation amount map 24 varies depending on the vehicle.

In parallel with the processing in steps S201 and S202, steps S211, S212, S202
The processing at 213 is performed. That is, in step S211, the longitudinal acceleration detection value 23 from the vehicle longitudinal acceleration sensor 13 is detected, and the process proceeds to the next step S212. In step S212, referring to the acceleration correction map 24 stored in advance in the generator control device 10, step S2 is performed.
11 is derived, and the process proceeds to the next step S213. The acceleration correction coefficient set in the acceleration correction map differs depending on the vehicle. In step S213, the SOC of the Li ion battery 11 is detected by the Li ion battery state detection sensor 14 in order to prevent overcharging when the Li ion battery 11 is charged.

  In step S214, the multiplier 27 multiplies the power generation amount 221 by the power generation amount map 22 in step S202, the acceleration correction coefficient 241 by the acceleration correction map 24 in step S212, and the SOC correction coefficient 261 in step S213 by the multiplier 27. Then, the final target power generation amount 28 is calculated.

  Next, the process proceeds to step S215, where it is determined whether or not the target power generation amount 28 is greater than “0”. If the target power generation amount 28 is greater than “0”, the process proceeds to step S216 and the target power generation amount 28 is determined. The field current i of the generator is adjusted and the amount of power generation is adjusted. In general, the amount of power generation increases as the field current i increases.

  On the other hand, as a result of the determination in step S215, if the target power generation amount 28 is “0”, the process proceeds to step s217, and the rotor of the generator 5 is driven to rotate by the driving force of the turbine. The power generation operation is stopped by setting the magnetic current i to “0”.

  As described above, according to the turbine generator control apparatus according to Embodiment 1 of the present invention, the vehicle speed, the throttle position, the longitudinal acceleration, and the SOC of the Li-ion battery are detected. Since the target power generation amount is calculated from the power generation amount based on the power generation amount map set so as not to impair driving comfort, the acceleration correction coefficient based on the acceleration correction map, and the SOC correction coefficient based on the SOC correction map, It is possible to achieve both power generation according to the vehicle situation and driving comfort of the driver. Moreover, since power generation is performed using exhaust energy that has been discarded, it is possible to obtain a fuel efficiency improvement effect.

  In the first embodiment, the field current of the generator is adjusted as a means for controlling the amount of power generation. However, when a permanent magnet is used as the field of the generator, the armature current is adjusted. It is possible to obtain the same effect by adjusting.

  Although the turbine generator is specified in the first embodiment, the generator is provided with an electric supercharger provided with a compressor on the generator shaft coaxial with the turbine shaft and capable of supercharging the internal combustion engine by the compressor. Even if it is a machine, the same effect can be obtained. In the case of this configuration, it is possible to perform supercharging to the internal combustion engine in addition to power generation.

  Further, in the first embodiment, the vehicle longitudinal acceleration sensor for detecting longitudinal acceleration is provided, but the vehicle longitudinal acceleration sensor may be omitted and a differential value of the vehicle speed may be used as the longitudinal acceleration for simple configuration. In this configuration, the number of parts can be reduced.

  In the first embodiment, the vehicle speed sensor is used. However, the engine speed detection sensor is used instead of the vehicle speed sensor, and the vehicle speed sensor is equivalent to the case of using the engine speed and the detected value from the transmission. It becomes possible to obtain the effect.

Furthermore, when calculating the target power generation amount, a deceleration coefficient based on a detection value from the brake position sensor may be used in addition to the acceleration correction coefficient and the SOC correction coefficient described above.
In this case, by including the result, the power generation correction value can be set more strictly, and the driving comfort of the driver can be further improved.

  Moreover, in Embodiment 1, although the Li ion battery was used, the same effect is acquired also with a lead battery, and it is not restrict | limited to the kind of battery.

  Furthermore, in Embodiment 1, although the case of the gasoline engine was shown as an internal combustion engine, the same effect is acquired also with a diesel engine.

  It should be understood by those skilled in the art that the present invention is not limited to these embodiments, and that various embodiments can be made within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Internal combustion engine 2 Intake manifold 3 Exhaust manifold 4 Throttle valve 5 Generator 6 Turbine 7 Air cleaner 8 Throttle position sensor 9 Generator control device 10 Power generation amount map 11 Li ion battery 12 Vehicle speed sensor 13 Vehicle longitudinal acceleration sensor 14 Li ion battery state detection Sensor 20 Vehicle speed detection value 21 Throttle position detection value 22 Power generation amount map 23 Longitudinal acceleration detection value 24 Acceleration correction map 25 SOC detection value 26 SOC correction map 27 Multiplier 28 Target power generation 29 Field current calculator 30 Field current 221 Power generation Amount 241 Acceleration correction coefficient 261 SOC correction coefficient

Claims (5)

A generator control device provided in an exhaust passage of an internal combustion engine for driving a vehicle and capable of generating electric power via a turbine driven by exhaust gas energy of the internal combustion engine ,
Based on the amount of the exhaust gas energy determined according to at least one of the detected vehicle speed and the rotational speed of the internal combustion engine and at least one of the detected throttle position and accelerator position. A generator control device that calculates a target power generation amount of the generator and controls the power generation amount of the generator based on the calculated target power generation amount. A power generation amount map in which the power generation amount of the generator is set based on at least one of the speed of the vehicle and the rotational speed of the internal combustion engine and at least one of a throttle position and an accelerator position;
A power generation amount corresponding to at least one of the detected vehicle speed and the rotational speed of the internal combustion engine and at least one of the detected throttle position and accelerator position is derived from the power generation amount map,
The generator control device according to claim 1, wherein a target power generation amount of the generator is calculated based on a power generation amount derived from the power generation amount map. An acceleration correction map in which a first power generation amount correction coefficient is set based on the longitudinal acceleration of the vehicle;
An acceleration correction coefficient corresponding to the detected longitudinal acceleration of the vehicle is derived from the acceleration correction map,
The generator control device according to claim 2, wherein the power generation amount derived from the power generation amount map is corrected by the acceleration correction coefficient derived from the acceleration correction map. A battery charged by the generator; and a charging state correction map in which a charging state correction coefficient is set based on a charging state of the battery;
A charge state correction coefficient corresponding to the detected charge state of the battery is derived from the charge state correction map,
The generator control device according to claim 2 or 3, wherein the power generation amount derived from the power generation amount map is corrected by the charge state correction coefficient derived from the charge state correction map. With a brake correction map that sets a correction coefficient based on the brake position,
A brake correction coefficient corresponding to the detected brake position is derived from the brake correction map,
5. The generator control device according to claim 2, wherein the power generation amount derived from the power generation amount map is corrected by the brake correction coefficient derived from the brake correction map. 6. .

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