DRIVE CONTROL DEVICE OF HYBRID VEHICLE

• US 20140058604A1
• Filed: 02/04/2011
• Published: 02/27/2014
• Est. Priority Date: 02/04/2011
• Status: Active Grant

• Current Assignee: Suzuki Motor Corporation
• Original Assignee: Suzuki Motor Corporation
• Inventors: Ito, Yoshiki, Tagawa, Masaaki, Saito, Masakazu, Ohkuma, Hitoshi, Hosoe, Yukihiro
• Granted Patent: US 8,983,700 B2
• Time in Patent Office: Days
• US Class Current: 701/22
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/26 for electrical energy, e.g. batteries or capacitors
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2710/0677 Engine power
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 2710/244 Charge state
• CPC Class Codes: B60W 2710/248 Current for loading or unloading
• CPC Class Codes: B60W 30/1882 characterised by the working point of the engine, e.g. by using engine output chart
• CPC Class Codes: B60W 40/105 Speed
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility
• CPC Class Codes: Y10S 903/93 Conjoint control of different elements

Abstract

Objects are to set up control of a plurality of motor generators in a case where a battery is charged or discharged, to secure both a target driving force and target charging/discharging, and to have the breath of control of using electric power of the battery under a more specific condition. A target driving power setting means sets driving power corresponding to a state in which power assistance depending on the electric power of the battery is received as a maximal value of a target driving power in advance, a target engine power calculating means sets a maximal value of target engine power corresponding to a maximal output that can be output by an internal combustion engine in advance, compares the target engine power and the maximal value of the target engine power with each other, and updates the target engine power with a smaller value thereof, a target electric power calculating means calculating target electric power is arranged, and a motor torque instruction value calculating means calculates torque instruction values of the plurality of motor generators by using a torque balance equation including target engine torque and an electric power balance equation including the target electric power.

Claims

1. A drive control device of a hybrid vehicle that controls driving of the vehicle using outputs of an internal combustion engine and a plurality of motor generators, the drive control device comprising:

an accelerator opening degree detecting means that detects the accelerator opening degree;

a vehicle speed detecting means that detects a vehicle speed;

a battery charge state detecting means that detects a charge state of a battery;

a target driving power setting means that sets target driving power based on the accelerator opening degree that is detected by the accelerator opening degree detecting means and the vehicle speed detected by the vehicle speed detecting means;

a target charge/discharge power setting means that sets target charge/discharge power based on at least the charge state of the battery that is detected by the battery charge state detecting means;

a target engine power calculating means that calculates target engine power from the target driving power setting means and the target charge/discharge power setting means;

a target engine operating point setting means that sets a target engine operating point based on the target engine power and total system efficiency; and

a motor torque instruction value calculating means that sets torque instruction values of the plurality of motor generators,

wherein the target driving power setting means sets driving power corresponding to a state in which power assistance depending on electric power of the battery is received as a maximal value of the target driving power in advance,

wherein the target engine power calculating means sets a maximal value of the target engine power corresponding to a maximal output that can be output by the internal combustion engine in advance, compares the target engine power and the maximal value of the target engine power calculated by the target driving power setting means and the target charge/discharge power setting means with each other, and updates the target engine power with a smaller value thereof,

wherein a target electric power calculating means calculating target electric power that is a target value of input/output electric power for the battery based on a difference between the target driving power and the target engine power is arranged, and

wherein the motor torque instruction value calculating means calculates torque instruction values of the plurality of motor generators by using a torque balance equation including target engine torque required at the target engine operating point and an electric power balance equation including the target electric power.

2. The drive control device of the hybrid vehicle according to claim 1, wherein the motor torque instruction value calculating means sets feedback correction amounts in the torque instruction values of the plurality of motor generators such that an actual engine rotation speed converges on the target engine rotation speed required at the target engine operating point.

3. The drive control device of the hybrid vehicle according to claim 1, wherein the motor torque instruction value calculating means calculates rotation speeds of the plurality of motor generators based on the target engine rotation speed required at the target engine operating point and the vehicle speed, calculates a torque instruction value of a first motor generator based on the rotation speeds of the plurality of motor generators, the target electric power, and the target engine torque, and calculates a torque instruction value of a second motor generator based on the torque instruction value of the first motor generator and the target engine torque.