METHOD OF LIMITING VEHICLE SPEED DURING EVACUATION RUNNING, AND VEHICLE

• US 20150321562A1
• Filed: 09/05/2013
• Published: 11/12/2015
• Est. Priority Date: 01/28/2013
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Original Assignee: Kabushiki Kaisha Toyota Jidoshokki
• Inventors: NOMURA, Hiroyuki, MATSUI, Tadasumi, NISHIGAKI, Kenji, KIDONO, Masashi, TSUZUKU, Takahiro, YOSHIZAWA, Hiromasa
• Application Number:
  US14/761,205
• Publication Number:
  US 20150321562A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60L 15/2009 for braking
• CPC Class Codes: B60L 2200/42 Fork lift trucks
• CPC Class Codes: B60L 2240/12 Speed
• CPC Class Codes: B60L 2240/421 Speed
• CPC Class Codes: B60L 2240/545 Temperature
• CPC Class Codes: B60L 3/0046 relating to electric energy storage systems, e.g. batteries or capacitors
• CPC Class Codes: B60L 3/0084 relating to control modules
• CPC Class Codes: B60L 3/04 Cutting off the power supply under fault conditions protective devices and circuit arrangements in general H01H; H02H
• CPC Class Codes: B60L 3/08 Means for preventing excessive speed of the vehicle
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 58/15 Preventing overcharging
• CPC Class Codes: B60L 58/18 of two or more battery modules
• CPC Class Codes: B60L 58/21 having the same nominal voltage
• CPC Class Codes: B60L 7/10 Dynamic electric regenerative braking B60L7/22 takes precedence
• CPC Class Codes: B60L 7/14 for vehicles propelled by ac motors
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

The present application relates to a vehicle and a method of limiting a vehicle speed during evacuation running designed to prevent a normal battery block from being overcharged by regenerative electric power during evacuation running, in which a vehicle driven by a parallely connected battery blocks runs under a condition in which some abnormal battery blocks are separated. The method may include determining whether a vehicle is performing evacuation running, calculating receivable regenerative electric power for the battery blocks used for running of the vehicle, calculating a limit speed of the vehicle according to the receivable regenerative electric power, and limiting the speed of the vehicle to the limit speed or to a speed lower than the limit speed.

Claims

1. A method of limiting a vehicle speed during evacuation running, the method comprising:

a regenerative-electric-power calculating step of calculating, in causing a vehicle to run under a condition in which some of a plurality of parallely connected battery blocks are separated, regenerative electric power that a decreased number of battery blocks remaining after the separation is capable of receiving;

a limit speed calculating step of calculating a limit speed of the vehicle according to the receivable regenerative electric power calculated in the regenerative-electric-power calculating step, in a manner such that regenerative electric power generated when the vehicle is braked does not exceed the receivable regenerative electric power; and

a vehicle speed limiting step of limiting the speed of the vehicle to the limit speed calculated in the limit speed calculating step or to a speed lower than the limit speed.

2. The method of limiting the vehicle speed during evacuation running according to claim 1, wherein

the regenerative-electric-power calculating step includes storing in advance, for each different temperature, a map indicating a correlation between the receivable power and a state of charge of the battery blocks, and referring to the map according to a state of charge and temperature of a battery block used for running of the vehicle so as to calculate regenerative electric power that the battery block used for running of the vehicle is capable of receiving.

3. The method of limiting the vehicle speed during evacuation running according to claim 1, wherein

the limit speed calculating step includes converting the receivable regenerative electric power into kinetic energy of the vehicle, and calculating, as a vehicle limit speed, a vehicle speed that does not exceed the kinetic energy.

4. A vehicle that runs using a motor driven by a plurality of parallely connected battery blocks, the vehicle comprising:

a running determining unit to determine whether the vehicle is performing evacuation running in which the vehicle runs under a condition in which some of the plurality of parallely connected battery blocks are separated;

a regenerative-electric-power calculating unit to calculate regenerative electric power that a decreased number of battery blocks remaining after the separation in the evacuation running is capable of receiving;

a limit speed calculating unit to calculate a limit speed of the vehicle in a manner such that regenerative electric power generated when the vehicle is braked becomes the receivable regenerative electric power or power less than the receivable regenerative electric power; and

a speed limit imposing unit to control an inverter for driving the motor that causes the vehicle to run, in a manner such that the speed of the vehicle becomes the limit speed calculated by the limit speed calculating unit or a speed that is lower than the limit speed.